David Wragg
ec779c5ebd
We need to set the MTU of the overlay network accurately, because with fast datapath we can't inject the ICMP frag-needed packets to cause a lower path MTU. Later on we can refine this to try to try to automatically detect a good cluster-wide MTU value. But for now we default to a conservative value that should work on almost all local networks, with support for manually overriding it where a higher MTU gives better performance.
1058 lines
36 KiB
Bash
Executable File
1058 lines
36 KiB
Bash
Executable File
#!/bin/sh
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set -e
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[ -n "$WEAVE_DEBUG" ] && set -x
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SCRIPT_VERSION="(unreleased version)"
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if [ "$SCRIPT_VERSION" = "(unreleased version)" ] ; then
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IMAGE_VERSION=latest
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else
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IMAGE_VERSION=$SCRIPT_VERSION
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fi
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IMAGE_VERSION=${VERSION:-$IMAGE_VERSION}
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# These are potentially used for remote execs, and have defaults, so
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# we introduce them here
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DOCKERHUB_USER=weaveworks
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BASE_EXEC_IMAGE=$DOCKERHUB_USER/weaveexec
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EXEC_IMAGE=$BASE_EXEC_IMAGE:$IMAGE_VERSION
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# Define some regular expressions for matching addresses.
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# The regexp here is far from precise, but good enough.
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IP_REGEXP="[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"
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CIDR_REGEXP="$IP_REGEXP/[0-9]{1,2}"
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usage() {
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echo "Usage:"
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echo "weave setup"
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echo "weave launch [-password <password>] [-nickname <nickname>] [-iprange <cidr>] <peer> ..."
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echo "weave launch-dns <cidr>"
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echo "weave launch-proxy [-H <docker_endpoint>] [--with-dns] [--with-ipam]"
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echo "weave connect <peer>"
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echo "weave forget <peer>"
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echo "weave run [--with-dns] [<cidr> ...] <docker run args> ..."
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echo "weave start [<cidr> ...] <container_id>"
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echo "weave attach [<cidr> ...] <container_id>"
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echo "weave detach <cidr> [<cidr> ...] <container_id>"
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echo "weave dns-add <ip_address> [<ip_address> ...] <container_id> [-h <fqdn>]"
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echo "weave dns-remove <ip_address> [<ip_address> ...] <container_id>"
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echo "weave expose [<cidr> ...] [-h <fqdn>]"
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echo "weave hide [<cidr> ...]"
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echo "weave ps [<container_id> ...]"
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echo "weave status"
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echo "weave version"
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echo "weave stop"
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echo "weave stop-dns"
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echo "weave reset"
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echo "weave rmpeer <peer_id>"
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echo
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echo "where <peer> is of the form <ip_address_or_fqdn>[:<port>], and"
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echo " <cidr> is of the form <ip_address>/<routing_prefix_length>"
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echo " <peer_id> is a <nickname> or weave internal peer ID"
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exit 1
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}
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exec_remote() {
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docker $DOCKER_CLIENT_ARGS run --rm --privileged --net=host \
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-v /var/run/docker.sock:/var/run/docker.sock \
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-v /proc:/hostproc \
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-e PROCFS=/hostproc \
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-e VERSION \
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-e WEAVE_DEBUG \
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-e WEAVE_DOCKER_ARGS \
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-e WEAVEDNS_DOCKER_ARGS \
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-e WEAVEPROXY_DOCKER_ARGS \
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-e WEAVE_PASSWORD \
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-e WEAVE_PORT \
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-e WEAVE_CONTAINER_NAME \
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-e WEAVE_MTU \
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-e DOCKER_BRIDGE \
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$WEAVEEXEC_DOCKER_ARGS $EXEC_IMAGE --local "$@"
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}
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check_docker_version() {
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if ! DOCKER_VERSION=$(docker -v | sed -n -e 's|^Docker version \([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*|\1|p') || [ -z "$DOCKER_VERSION" ] ; then
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echo "ERROR: Unable to parse docker version" >&2
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exit 1
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fi
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# guard against https://github.com/docker/docker/issues/8632
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if [ "$DOCKER_VERSION" = "1.3.0" ] ; then
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echo "You are running Docker version $DOCKER_VERSION, which contains a bug that prevents weave from working properly. Please upgrade." >&2
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exit 1
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fi
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}
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is_cidr() {
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echo "$1" | grep -E "^$CIDR_REGEXP$" >/dev/null
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}
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validate_cidr() {
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if ! is_cidr "$1" ; then
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echo "Invalid address prefix: $1" >&2
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echo "Must be in CIDR notation <ip_address>/<prefix_length>, e.g. 10.2.1.1/24" >&2
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exit 1
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fi
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}
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collect_cidr_args() {
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CIDR_ARGS=""
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CIDR_COUNT=0
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while is_cidr "$1"; do
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CIDR_ARGS="$CIDR_ARGS $1"
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CIDR_COUNT=$((CIDR_COUNT + 1))
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shift 1
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done
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}
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is_ip() {
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echo "$1" | grep -E "^$IP_REGEXP$" >/dev/null
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}
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validate_ip() {
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if ! is_ip "$1" ; then
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echo "Invalid IP: $1" >&2
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echo "IP must be of the form <aaa.bbb.ccc.ddd>, e.g. 10.2.1.1" >&2
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exit 1
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fi
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}
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collect_ip_args() {
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IP_ARGS=""
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IP_COUNT=0
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while is_ip "$1"; do
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IP_ARGS="$IP_ARGS $1"
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IP_COUNT=$((IP_COUNT + 1))
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shift 1
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done
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if [ $IP_COUNT -eq 0 ]; then
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[ $# -gt 0 ] && validate_ip "$1" || usage
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fi
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}
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# "run" is a special case because we want to use docker directly,
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# rather than the docker in $EXEC_IMAGE remotely. That's because we
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# are passing arbitrary arguments on to docker run, and we can't rely
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# on our baked-in docker to support those arguments.
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if [ "$1" = "run" ]; then
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shift 1
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check_docker_version
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if [ "$1" = "--with-dns" ]; then
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shift 1
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DNS_ARGS=$(exec_remote dns-args "$@")
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fi
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collect_cidr_args "$@"
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shift $CIDR_COUNT
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CONTAINER=$(docker $DOCKER_CLIENT_ARGS run $DNS_ARGS -d "$@")
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exec_remote attach $CIDR_ARGS $CONTAINER
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echo $CONTAINER
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exit 0
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elif [ "$1" != "--local" ]; then
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exec_remote "$@"
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exit $?
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fi
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shift 1
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BASE_IMAGE=$DOCKERHUB_USER/weave
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BASE_DNS_IMAGE=$DOCKERHUB_USER/weavedns
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IMAGE=$BASE_IMAGE:$IMAGE_VERSION
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DNS_IMAGE=$BASE_DNS_IMAGE:$IMAGE_VERSION
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PROCFS=${PROCFS:-/proc}
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DOCKER_BRIDGE=${DOCKER_BRIDGE:-docker0}
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CONTAINER_NAME=${WEAVE_CONTAINER_NAME:-weave}
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DNS_CONTAINER_NAME=weavedns
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BRIDGE=weave
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CONTAINER_IFNAME=ethwe
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PORT=${WEAVE_PORT:-6783}
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HTTP_PORT=6784
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DNS_HTTP_PORT=6785
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PROXY_PORT=12375
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PROXY_CONTAINER_NAME=weaveproxy
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PROXY_HOST="localhost"
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if [ "$DOCKER_HOST" != "${DOCKER_HOST#tcp://}" ] ; then
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PROXY_HOST=$(echo "$DOCKER_HOST" | sed -e "s|tcp://\([^:]*\):[0-9]*|\1|")
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fi
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# GCE has the lowest underlay network MTU we're likely to encounter on
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# a local network, at 1460 bytes. To get the overlay MTU from that we
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# subtract 20 bytes for the outer IPv4 header, 8 bytes for the outer
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# UDP hear, 8 bytes for the vxlan header, and 14 bytes for the inner
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# ethernet header.
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MTU=${WEAVE_MTU:-1410}
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######################################################################
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# general helpers; independent of docker and weave
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######################################################################
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# utility function to check whether a command can be executed by the shell
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# see http://stackoverflow.com/questions/592620/how-to-check-if-a-program-exists-from-a-bash-script
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command_exists () {
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command -v $1 >/dev/null 2>&1
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}
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run_iptables() {
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# -w is recent addition to iptables
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if [ -z "$CHECKED_IPTABLES_W" ] ; then
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if iptables -S -w >/dev/null 2>&1 ; then
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IPTABLES_W=-w
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fi
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CHECKED_IPTABLES_W=1
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fi
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iptables $IPTABLES_W "$@"
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}
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# Add a rule to iptables, if it doesn't exist already
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add_iptables_rule() {
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IPTABLES_TABLE="$1"
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shift 1
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if ! run_iptables -t $IPTABLES_TABLE -C "$@" >/dev/null 2>&1
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then
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run_iptables -t $IPTABLES_TABLE -A "$@" >/dev/null
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fi
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}
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# Delete a rule from iptables, if it exist
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delete_iptables_rule() {
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IPTABLES_TABLE="$1"
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shift 1
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if run_iptables -t $IPTABLES_TABLE -C "$@" >/dev/null 2>&1
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then
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run_iptables -t $IPTABLES_TABLE -D "$@" >/dev/null
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fi
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}
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# Configure the ARP cache parameters for the given interface. This
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# makes containers react more quickly to a change in the MAC address
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# associated with an IP address.
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configure_arp_cache() {
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$2 sh -c "echo 5 >/proc/sys/net/ipv4/neigh/$1/base_reachable_time &&
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echo 2 >/proc/sys/net/ipv4/neigh/$1/delay_first_probe_time &&
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echo 1 >/proc/sys/net/ipv4/neigh/$1/ucast_solicit"
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}
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# Send out an unsolicated ARP response to update ARP cache entries
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# accross the weave network. We do this in addition to
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# configure_arp_cache because a) with those ARP cache settings it
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# still takes a few seconds to correct a stale ARP mapping, and b)
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# there is a kernel bug that means that the base_reachable_time
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# setting is not promptly obeyed
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# (<https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4bf6980dd0328530783fd657c776e3719b421d30>>).
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arp_update() {
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# It's not the end of the world if this doesn't run - we configure
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# ARP caches so that stale entries will be noticed quickly.
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if command_exists arping ; then
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$3 arping -U -q -I $1 -c 1 ${2%/*}
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fi
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}
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# Generate a random MAC value
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random_mac() {
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# In the first byte of the MAC, the 'multicast' bit should be
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# clear and 'locally administered' bit should be set. All other
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# bits should be random.
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od -txC -An -N6 /dev/urandom | sed 's|^ ||;s| |:|;s|[0-3]:|2:|;s|[4-7]:|6:|;s|[89ab]:|a:|;s|[c-f]:|e:|;s| |:|g'
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}
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######################################################################
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# weave and docker specific helpers
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######################################################################
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create_bridge() {
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[ ! -d /sys/class/net/$BRIDGE ] && {
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docker run --rm --privileged --net=host $IMAGE --createdp --dpname=$BRIDGE
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#ip link add name $BRIDGE type bridge
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# Set a random MAC address on the bridge. Current Linux
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# kernels already do this when creating a bridge, but there
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# are rumours it was not always so.
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ip link set dev $BRIDGE address $(random_mac)
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# Attempting to set the bridge MTU to a high value directly
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# fails. Bridges take the lowest MTU of their interfaces. So
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# instead we create a temporary interface with the desired
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# MTU, attach that to the bridge, and then remove it again.
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#ip link add name v${CONTAINER_IFNAME}du mtu $MTU type dummy
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#ip link set dev v${CONTAINER_IFNAME}du master $BRIDGE
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#ip link del dev v${CONTAINER_IFNAME}du
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ip link set dev $BRIDGE mtu $MTU
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# Drop traffic from Docker bridge to Weave; it can break subnet isolation
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if [ "$DOCKER_BRIDGE" != "$BRIDGE" ] ; then
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# Note using -I to insert ahead of Docker's bridge rules
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run_iptables -t filter -I FORWARD -i $DOCKER_BRIDGE -o $BRIDGE -j DROP
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fi
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# Work around the situation where there are no rules allowing traffic
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# across our bridge. E.g. ufw
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add_iptables_rule filter FORWARD -i $BRIDGE -o $BRIDGE -j ACCEPT
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# create a chain for masquerading
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run_iptables -t nat -N WEAVE >/dev/null 2>&1 || true
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add_iptables_rule nat POSTROUTING -j WEAVE
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}
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if [ ! "$1" = "--without-ethtool" ] ; then
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ethtool -K $BRIDGE tx off >/dev/null
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fi
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ip link set dev $BRIDGE up
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# Configure the ARP cache parameters on the bridge interface for
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# the sake of 'weave expose'
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configure_arp_cache $BRIDGE
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}
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destroy_bridge() {
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if [ -d /sys/class/net/$BRIDGE ] ; then
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docker run --rm --privileged --net=host $IMAGE --deletedp --dpname=$BRIDGE
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#ip link del dev $BRIDGE
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fi
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if [ "$DOCKER_BRIDGE" != "$BRIDGE" ] ; then
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run_iptables -t filter -D FORWARD -i $DOCKER_BRIDGE -o $BRIDGE -j DROP 2>/dev/null || true
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fi
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run_iptables -t filter -D FORWARD -i $BRIDGE -o $BRIDGE -j ACCEPT 2>/dev/null || true
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run_iptables -t nat -F WEAVE >/dev/null 2>&1 || true
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run_iptables -t nat -D POSTROUTING -j WEAVE >/dev/null 2>&1 || true
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run_iptables -t nat -X WEAVE >/dev/null 2>&1 || true
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}
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docker_bridge_ip() {
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DOCKER_BRIDGE_IP=$(ip -4 addr show dev $DOCKER_BRIDGE | grep -m1 -o 'inet [.0-9]*')
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DOCKER_BRIDGE_IP=${DOCKER_BRIDGE_IP#inet }
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}
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# the following borrows from https://github.com/jpetazzo/pipework
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# Set $CONTAINER_PID to the PID of container $1, $LOCAL_IFNAME and
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# $GUEST_IFNAME to suitable names for two ends of a veth pair, specific
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# to the container, and execute args $2 $3 ... as a command. If an error
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# is caused by container dying, swallow output from error.
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with_container_netns () {
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CONTAINER="$1"
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CONTAINER_PID=$(docker inspect --format='{{.State.Pid}}' $CONTAINER)
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if [ "$CONTAINER_PID" = 0 ] ; then
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echo "Container $CONTAINER not running." >&2
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exit 1
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fi
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if [ "$CONTAINER_PID" = "<no value>" ] ; then
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echo "Container $CONTAINER unknown to Docker." >&2
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exit 1
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fi
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LOCAL_IFNAME="v${CONTAINER_IFNAME}pl${CONTAINER_PID}"
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GUEST_IFNAME="v${CONTAINER_IFNAME}pg${CONTAINER_PID}"
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IP_TMPOUT=/tmp/weave_ip_out_$$
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IP_TMPERR=/tmp/weave_ip_err_$$
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rm -f $IP_TMPOUT $IP_TMPERR
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# Run the wrapped command
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STATUS=0
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shift 1
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if ! "$@" >$IP_TMPOUT 2>$IP_TMPERR ; then
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STATUS=1
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if ! kill -0 "$CONTAINER_PID" 2>/dev/null ; then
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echo "Container $CONTAINER died" >&2
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else
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echo "Failure during network configuration for container $CONTAINER:" >&2
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cat $IP_TMPERR >&2
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fi
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else
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cat $IP_TMPOUT
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cat $IP_TMPERR >&2
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fi
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rm -f $IP_TMPOUT $IP_TMPERR
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return $STATUS
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}
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# Execute arguments as a command within the network namespace of $CONTAINER_PID
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netnsenter() {
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nsenter --net=$PROCFS/$CONTAINER_PID/ns/net "$@"
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}
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connect_container_to_bridge() {
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#if [ -h "$PROCFS/$CONTAINER_PID/ns/net" -a -h "$PROCFS/$$/ns/net" -a "$(readlink $PROCFS/$CONTAINER_PID/ns/net)" = "$(readlink $PROCFS/$$/ns/net)" ] ; then
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# echo "Container is running in the host network namespace, and therefore cannot be" >&2
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# echo "connected to weave. Perhaps the container was started with --net=host." >&2
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# return 1
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#fi
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ip link add name $LOCAL_IFNAME mtu $MTU type veth peer name $GUEST_IFNAME mtu $MTU || return 1
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|
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|
if ! ethtool -K $GUEST_IFNAME tx off >/dev/null ||
|
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! ip link set $GUEST_IFNAME netns $PROCFS/$CONTAINER_PID/ns/net ; then
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# failed before we assigned the veth to the container's
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# namespace
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ip link del $LOCAL_IFNAME type veth || true
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return 1
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fi
|
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|
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# Versions of the 'ip' command differ in whether they create a
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# veth pair in the 'up' or 'down' state. Furthermore, moving one
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# end into a netns normally sets them to 'down'. But, moving an
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# end into the default netns is a null operation, so they stay up,
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# which leads to errors later on. So to get a consistent result,
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# we have to be explicit in setting them 'up' or 'down' as
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# necessary.
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if ! netnsenter ip link set $GUEST_IFNAME down ||
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! netnsenter ip link set $GUEST_IFNAME name $CONTAINER_IFNAME up ||
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! ip link set $LOCAL_IFNAME up ||
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! docker run --rm --privileged --net=host $IMAGE --adddpif=$LOCAL_IFNAME --dpname=$BRIDGE ||
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! configure_arp_cache $CONTAINER_IFNAME "netnsenter" ; then
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return 1
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fi
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}
|
|
|
|
ask_version() {
|
|
if ! DOCKERIMAGE=$(docker inspect --format='{{.Image}}' $1 2>/dev/null) ; then
|
|
if ! DOCKERIMAGE=$(docker inspect --format='{{.Id}}' $2 2>/dev/null) ; then
|
|
echo "Unable to find $2 image." >&2
|
|
fi
|
|
fi
|
|
[ -n "$DOCKERIMAGE" ] && docker run --rm $DOCKERIMAGE --version
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}
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|
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######################################################################
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# functions invoked through with_container_netns
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######################################################################
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launch() {
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|
#if ! netnsenter ip link show eth0 >/dev/null ; then
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# echo "Perhaps you are running the docker daemon with container networking disabled (-b=none)." >&2
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# return 1
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|
#fi
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connect_container_to_bridge &&
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#netnsenter ethtool -K eth0 tx off >/dev/null &&
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netnsenter ip link set $CONTAINER_IFNAME up
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}
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attach() {
|
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if netnsenter ip link show $CONTAINER_IFNAME >/dev/null 2>&1 ; then
|
|
for ADDR; do
|
|
# container already has the expected network interface, so assume we set it up already;
|
|
# just add the IP address.
|
|
if netnsenter ip addr show dev $CONTAINER_IFNAME | grep -F $ADDR >/dev/null ; then
|
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# address was there already
|
|
continue
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|
fi
|
|
netnsenter ip addr add $ADDR dev $CONTAINER_IFNAME || return 1
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|
done
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|
|
return 0
|
|
fi
|
|
|
|
connect_container_to_bridge || return 1
|
|
|
|
for ADDR; do
|
|
netnsenter ip addr add $ADDR dev $CONTAINER_IFNAME || return 1
|
|
done
|
|
|
|
netnsenter ip link set $CONTAINER_IFNAME up || return 1
|
|
|
|
# Route multicast packets across the weave network.
|
|
if ! netnsenter ip route show | grep '^224\.0\.0\.0/4' >/dev/null ; then
|
|
netnsenter ip route add 224.0.0.0/4 dev $CONTAINER_IFNAME
|
|
fi
|
|
|
|
arp_update $CONTAINER_IFNAME $1 "netnsenter"
|
|
}
|
|
|
|
detach() {
|
|
netnsenter ip link show $CONTAINER_IFNAME >/dev/null 2>&1 || return 0
|
|
|
|
for ADDR; do
|
|
if ! netnsenter ip addr show dev $CONTAINER_IFNAME | grep -F $ADDR >/dev/null ; then
|
|
# address is not there, leave the device alone
|
|
continue
|
|
fi
|
|
netnsenter ip addr del $ADDR dev $CONTAINER_IFNAME || return 1
|
|
done
|
|
|
|
if [ -n "$(netnsenter ip -f inet addr show dev $CONTAINER_IFNAME)" ] ; then
|
|
# other addresses are left, leave the device alone
|
|
return 0
|
|
fi
|
|
|
|
# Deleting the interface will delete the multicast route we set up
|
|
netnsenter ip link del $CONTAINER_IFNAME type veth
|
|
}
|
|
|
|
container_weave_addrs() {
|
|
netnsenter ip addr show dev $CONTAINER_IFNAME
|
|
}
|
|
|
|
######################################################################
|
|
# functions for interacting with containers
|
|
######################################################################
|
|
|
|
# Check that a container named $1 with image $2 is not running
|
|
check_not_running() {
|
|
case $(docker inspect --format='{{.State.Running}} {{.Config.Image}}' $1 2>/dev/null) in
|
|
"true $2")
|
|
echo "$1 is already running." >&2
|
|
exit 1
|
|
;;
|
|
"true $2:"*)
|
|
echo "$1 is already running." >&2
|
|
exit 1
|
|
;;
|
|
"false $2")
|
|
docker rm $1 >/dev/null
|
|
;;
|
|
"false $2:"*)
|
|
docker rm $1 >/dev/null
|
|
;;
|
|
true*)
|
|
echo "Found another running container named '$1'. Aborting." >&2
|
|
exit 1
|
|
;;
|
|
false*)
|
|
echo "Found another container named '$1'. Aborting." >&2
|
|
exit 1
|
|
;;
|
|
esac
|
|
}
|
|
|
|
http_call_ip() {
|
|
ip="$1"
|
|
port="$2"
|
|
http_verb="$3"
|
|
url="$4"
|
|
shift 4
|
|
curl --connect-timeout 3 -s -X $http_verb "$@" http://$ip:$port$url
|
|
}
|
|
|
|
container_ip() {
|
|
if ! status=$(docker inspect --format='{{.State.Running}} {{.NetworkSettings.IPAddress}}' $1 2>/dev/null); then
|
|
echo "$2" >&2
|
|
return 1
|
|
fi
|
|
case "$status" in
|
|
"true ")
|
|
#echo "$1 container has no IP address; is Docker networking enabled?" >&2
|
|
CONTAINER_IP=127.0.0.1
|
|
;;
|
|
true*)
|
|
CONTAINER_IP="${status#true }"
|
|
;;
|
|
*)
|
|
echo "$3" >&2
|
|
return 1
|
|
;;
|
|
esac
|
|
}
|
|
|
|
# Call url $4 with http verb $3 on container $1 at port $2
|
|
http_call() {
|
|
container_ip $1 \
|
|
"$1 container is not present. Have you launched it?" \
|
|
"$1 container is not running." \
|
|
|| return 1
|
|
shift 1
|
|
http_call_ip $CONTAINER_IP "$@"
|
|
}
|
|
|
|
# Wait until container $1 on port $2 is alive enough to respond to its status call
|
|
wait_for_status() {
|
|
WAIT_TIME=0
|
|
while [ $WAIT_TIME -lt 3 ]; do
|
|
sleep $WAIT_TIME
|
|
container_ip $1 \
|
|
"$1 container has died." \
|
|
"$1 container has died." \
|
|
|| return 1
|
|
http_call_ip $CONTAINER_IP $2 GET /status >/dev/null && return 0
|
|
WAIT_TIME=$((WAIT_TIME+1))
|
|
done
|
|
echo "Timed out waiting for $1 container to start." >&2
|
|
return 1
|
|
}
|
|
|
|
# Just like wait_for_status, but takes the IP instead of a container ID
|
|
wait_for_status_ip() {
|
|
WAIT_TIME=0
|
|
while [ $WAIT_TIME -lt 3 ]; do
|
|
sleep $WAIT_TIME
|
|
http_call_ip $1 $2 GET ${3:-/status} >/dev/null && return 0
|
|
WAIT_TIME=$((WAIT_TIME+1))
|
|
done
|
|
echo "Timed out waiting for container to start." >&2
|
|
return 1
|
|
}
|
|
|
|
# Call $1 for all containers, passing container ID, all MACs and all IPs
|
|
with_container_addresses() {
|
|
COMMAND=$1
|
|
shift 1
|
|
for CONTAINER_ID in "$@" ; do
|
|
if [ "$CONTAINER_ID" = "weave:expose" ]; then
|
|
ADDRS_CMD="ip addr show dev $BRIDGE"
|
|
else
|
|
ADDRS_CMD="with_container_netns $CONTAINER_ID container_weave_addrs"
|
|
fi
|
|
if CONTAINER_ADDRS=$($ADDRS_CMD 2>/dev/null) ; then
|
|
CONTAINER_MAC=$(echo "$CONTAINER_ADDRS" | grep -o 'link/ether .*' | cut -d ' ' -f 2)
|
|
CONTAINER_IPS=$(echo "$CONTAINER_ADDRS" | grep -o 'inet .*' | cut -d ' ' -f 2)
|
|
$COMMAND "$CONTAINER_ID" "$CONTAINER_MAC" "$CONTAINER_IPS"
|
|
fi
|
|
done
|
|
}
|
|
|
|
echo_addresses() {
|
|
echo $1 $2 $3
|
|
}
|
|
|
|
######################################################################
|
|
# weaveDNS helpers
|
|
######################################################################
|
|
|
|
dns_args() {
|
|
if [ \( "$DOCKER_VERSION_MAJOR" -lt 1 \) -o \
|
|
\( "$DOCKER_VERSION_MAJOR" -eq 1 -a \
|
|
"$DOCKER_VERSION_MINOR" -lt 3 \) ] ; then
|
|
# Versions prior to 1.2.0 cannot parse `--dns-search=.`, and
|
|
# versions prior to 1.3.0 fail to include the domain when
|
|
# setting the hostname, so lookups for non-fully-qualified
|
|
# names fail.
|
|
echo "ERROR: The '--with-dns' option requires Docker 1.3.0 or later; you are running $DOCKER_VERSION" >&2
|
|
exit 1
|
|
fi
|
|
docker_bridge_ip
|
|
DNS_ARG="--dns $DOCKER_BRIDGE_IP"
|
|
DNS_SEARCH_ARG="--dns-search=."
|
|
for arg; do
|
|
case $arg in
|
|
--dns-search=*)
|
|
DNS_SEARCH_ARG=""
|
|
;;
|
|
*)
|
|
;;
|
|
esac;
|
|
done
|
|
DNS_ARGS="$DNS_ARG $DNS_SEARCH_ARG"
|
|
}
|
|
|
|
# Perform operation $1 on local DNS database, for container ID $2
|
|
# with an FQDN obtained from the container's configured hostname and
|
|
# domain, at addresses $3, $4 ...
|
|
tell_dns() {
|
|
METHOD="$1"
|
|
CONTAINER_ID="$2"
|
|
shift 2
|
|
CONTAINER_FQDN=$(docker inspect --format='{{.Config.Hostname}}.{{.Config.Domainname}}.' $CONTAINER_ID 2>/dev/null) || true
|
|
tell_dns_fqdn $METHOD $CONTAINER_ID $CONTAINER_FQDN $@
|
|
}
|
|
|
|
# Perform operation $1 on local DNS database, for container ID $2
|
|
# with FQDN $3, at addresses $4, $5 ... This function is only called
|
|
# where we know $2 is a valid container name
|
|
tell_dns_fqdn() {
|
|
METHOD="$1"
|
|
CONTAINER_ID="$2"
|
|
CONTAINER_FQDN="$3"
|
|
shift 3
|
|
if ! status=$(docker inspect --format='{{.State.Running}}' $DNS_CONTAINER_NAME 2>/dev/null) || [ "$status" != "true" ] ; then
|
|
# weavedns not running - silently return
|
|
return
|
|
fi
|
|
# get the long form of the container ID
|
|
CONTAINER=$(docker inspect --format='{{.Id}}' $CONTAINER_ID 2>/dev/null)
|
|
MORE_ARGS="--data-urlencode fqdn=$CONTAINER_FQDN"
|
|
for ADDR; do
|
|
http_call $DNS_CONTAINER_NAME $DNS_HTTP_PORT $METHOD /name/$CONTAINER/${ADDR%/*} $MORE_ARGS || true
|
|
done
|
|
}
|
|
|
|
# Tell the newly-started weaveDNS about existing weave IPs
|
|
populate_dns() {
|
|
if ! wait_for_status $DNS_CONTAINER_NAME $DNS_HTTP_PORT ; then
|
|
echo "If running, it will not be pre-populated." >&2
|
|
return 0
|
|
fi
|
|
for CONTAINER in $(docker ps -q --no-trunc); do
|
|
MORE_ARGS=$(docker inspect --format='--data-urlencode fqdn={{.Config.Hostname}}.{{.Config.Domainname}}.' $CONTAINER 2>/dev/null) || true
|
|
if CONTAINER_IPS=$(with_container_netns $CONTAINER container_weave_addrs 2>&1 | sed -n -e 's/inet \([^/]*\)\/\(.*\)/\1/p') ; then
|
|
for IP in $CONTAINER_IPS; do
|
|
# NB: CONTAINER_IP is the IP of the weavedns
|
|
# container; it is set by wait_for_status.
|
|
if ! http_call_ip $CONTAINER_IP $DNS_HTTP_PORT PUT /name/$CONTAINER/$IP $MORE_ARGS ; then
|
|
echo "Failed to fully populate DNS."
|
|
return 1
|
|
fi
|
|
done
|
|
fi
|
|
done
|
|
}
|
|
|
|
######################################################################
|
|
# IP Allocation Management helpers
|
|
######################################################################
|
|
|
|
# Claim addresses for a container in IPAM. Expects to be called from
|
|
# with_container_addresses.
|
|
ipam_claim() {
|
|
for CIDR in $3; do
|
|
# NB: CONTAINER_IP is the IP of the weave container; it is set by wait_for_status.
|
|
http_call_ip $CONTAINER_IP $HTTP_PORT PUT /ip/$1/${CIDR%/*}
|
|
done
|
|
}
|
|
|
|
# If we don't already have any CIDRs passed from the command-line, get one from IPAM
|
|
# $1 is the name of the container and $2, if set, is the ID to use inside IPAM
|
|
get_ipam_cidr() {
|
|
if [ -n "$CIDR_ARGS" ] ; then
|
|
return 0
|
|
fi
|
|
if [ -z "$2" ] ; then
|
|
# get the long form of the container ID
|
|
if ! status=$(docker inspect --format='{{.State.Running}} {{.Id}}' $1 2>/dev/null); then
|
|
echo "Error: No such container: $1" >&2
|
|
return 1
|
|
fi
|
|
case "$status" in
|
|
true*)
|
|
CONTAINER="${status#true }"
|
|
;;
|
|
*)
|
|
echo "$1 container is not running." >&2
|
|
return 1
|
|
;;
|
|
esac
|
|
else
|
|
CONTAINER="$2"
|
|
fi
|
|
CIDR_ARGS="$(http_call $CONTAINER_NAME $HTTP_PORT POST /ip/$CONTAINER)"
|
|
if [ "$CIDR_ARGS" = "404 page not found" ] ; then
|
|
echo "No IP address supplied (use the -iprange option on 'weave launch' to enable IP address allocation)" >&2
|
|
return 1
|
|
fi
|
|
}
|
|
|
|
##########################################################################################
|
|
|
|
[ $(id -u) = 0 ] || {
|
|
echo "weave must be run as 'root' when run locally" >&2
|
|
exit 1
|
|
}
|
|
|
|
uname -s -r | sed -n -e 's|^\([^ ]*\) \([0-9][0-9]*\)\.\([0-9][0-9]*\).*|\1 \2 \3|p' | {
|
|
if ! read sys maj min ; then
|
|
echo "ERROR: Unable to parse operating system version $(uname -s -r)" >&2
|
|
exit 1
|
|
fi
|
|
|
|
if [ "$sys" != 'Linux' ] ; then
|
|
echo "ERROR: Operating systems other than Linux are not supported (you have $(uname -s -r))" >&2
|
|
exit 1
|
|
fi
|
|
|
|
if ! [ \( "$maj" -eq 3 -a "$min" -ge 8 \) -o "$maj" -gt 3 ] ; then
|
|
echo "WARNING: Linux kernel version 3.8 or newer is required (you have ${maj}.${min})" >&2
|
|
fi
|
|
}
|
|
|
|
if ! command_exists ip ; then
|
|
echo "ERROR: ip utility is missing. Please install it." >&2
|
|
exit 1
|
|
fi
|
|
|
|
if ! ip netns list >/dev/null 2>&1 ; then
|
|
echo "ERROR: $(ip -V) does not support network namespaces." >&2
|
|
echo " Please install iproute2-ss111010 or later." >&2
|
|
exit 1
|
|
fi
|
|
|
|
check_docker_version
|
|
DOCKER_VERSION_MAJOR=$(echo "$DOCKER_VERSION" | cut -d. -f 1)
|
|
DOCKER_VERSION_MINOR=$(echo "$DOCKER_VERSION" | cut -d. -f 2)
|
|
DOCKER_VERSION_PATCH=$(echo "$DOCKER_VERSION" | cut -d. -f 3)
|
|
|
|
[ $# -gt 0 ] || usage
|
|
COMMAND=$1
|
|
shift 1
|
|
|
|
case "$COMMAND" in
|
|
setup)
|
|
for img in $IMAGE $DNS_IMAGE $EXEC_IMAGE ; do
|
|
docker pull $img
|
|
done
|
|
;;
|
|
# intentionally undocumented since it assumes knowledge of weave
|
|
# internals
|
|
create-bridge)
|
|
create_bridge --without-ethtool
|
|
;;
|
|
launch)
|
|
check_not_running $CONTAINER_NAME $BASE_IMAGE
|
|
create_bridge
|
|
# We set the router name to the bridge mac since that is
|
|
# stable across re-creations of the containers.
|
|
#
|
|
# TODO use the mac of one of the physical host interfaces
|
|
# (eth0, wlan0, etc) so the name becomes stable across host
|
|
# restarts.
|
|
PEERNAME=$(cat /sys/class/net/$BRIDGE/address)
|
|
# backward compatibility...
|
|
if is_cidr "$1" ; then
|
|
echo "WARNING: $1 parameter ignored; 'weave launch' no longer takes a CIDR as the first parameter" >&2
|
|
shift 1
|
|
fi
|
|
CONTAINER_PORT=$PORT
|
|
while true; do
|
|
case "$1" in
|
|
-password)
|
|
[ $# -gt 1 ] || usage
|
|
WEAVE_PASSWORD="$2"
|
|
export WEAVE_PASSWORD
|
|
shift 2
|
|
;;
|
|
-port)
|
|
[ $# -gt 1 ] || usage
|
|
CONTAINER_PORT="$2"
|
|
shift 2
|
|
;;
|
|
-iprange)
|
|
[ $# -gt 1 ] || usage
|
|
validate_cidr $2
|
|
IPRANGE="-iprange $2"
|
|
shift 2
|
|
;;
|
|
*)
|
|
break
|
|
;;
|
|
esac
|
|
done
|
|
# Set WEAVE_DOCKER_ARGS in the environment in order to supply
|
|
# additional parameters, such as resource limits, to docker
|
|
# when launching the weave container.
|
|
CONTAINER=$(docker run --privileged -d --name=$CONTAINER_NAME \
|
|
-p $PORT:$CONTAINER_PORT/tcp -p $PORT:$CONTAINER_PORT/udp -e WEAVE_PASSWORD -v /var/run/docker.sock:/var/run/docker.sock --net=host \
|
|
$WEAVE_DOCKER_ARGS $IMAGE -dpname $BRIDGE -port $CONTAINER_PORT -name "$PEERNAME" -nickname "$(hostname)" $IPRANGE "$@")
|
|
with_container_netns $CONTAINER launch >/dev/null
|
|
|
|
wait_for_status $CONTAINER_NAME $HTTP_PORT
|
|
if [ -n "$IPRANGE" ] ; then
|
|
# Tell the newly-started weave IP allocator about existing weave IPs
|
|
with_container_addresses ipam_claim weave:expose $(docker ps -q)
|
|
fi
|
|
|
|
echo $CONTAINER
|
|
;;
|
|
launch-dns)
|
|
[ $# -gt 0 ] || usage
|
|
CIDR=$1
|
|
validate_cidr $CIDR
|
|
shift 1
|
|
check_not_running $DNS_CONTAINER_NAME $BASE_DNS_IMAGE
|
|
create_bridge
|
|
docker_bridge_ip
|
|
# Set WEAVEDNS_DOCKER_ARGS in the environment in order to supply
|
|
# additional parameters, such as resource limits, to docker
|
|
# when launching the weave container.
|
|
DNS_CONTAINER=$(docker run --privileged -d --name=$DNS_CONTAINER_NAME \
|
|
-p $DOCKER_BRIDGE_IP:53:53/udp -v /var/run/docker.sock:/var/run/docker.sock \
|
|
$WEAVEDNS_DOCKER_ARGS $DNS_IMAGE -iface $CONTAINER_IFNAME "$@")
|
|
with_container_netns $DNS_CONTAINER attach $CIDR >/dev/null
|
|
populate_dns
|
|
echo $DNS_CONTAINER
|
|
;;
|
|
launch-proxy)
|
|
check_not_running $PROXY_CONTAINER_NAME $EXEC_IMAGE
|
|
# Set WEAVEPROXY_DOCKER_ARGS in the environment in order to supply
|
|
# additional parameters, such as resource limits, to docker
|
|
# when launching the weaveproxy container.
|
|
PROXY_CONTAINER=$(docker run --privileged --net=host -d \
|
|
--name=$PROXY_CONTAINER_NAME \
|
|
-p $PROXY_PORT:$PROXY_PORT/tcp \
|
|
-v /var/run/docker.sock:/var/run/docker.sock \
|
|
-v /proc:/hostproc -e PROCFS=/hostproc \
|
|
--entrypoint=/home/weave/weaveproxy \
|
|
$WEAVEPROXY_DOCKER_ARGS \
|
|
$EXEC_IMAGE "$@")
|
|
|
|
wait_for_status_ip $PROXY_HOST $PROXY_PORT /weave
|
|
echo $PROXY_CONTAINER
|
|
;;
|
|
connect)
|
|
[ $# -eq 1 ] || usage
|
|
http_call $CONTAINER_NAME $HTTP_PORT POST /connect -d "peer=$1"
|
|
;;
|
|
forget)
|
|
[ $# -eq 1 ] || usage
|
|
http_call $CONTAINER_NAME $HTTP_PORT POST /forget -d "peer=$1"
|
|
;;
|
|
status)
|
|
http_call $CONTAINER_NAME $HTTP_PORT GET /status || true
|
|
echo
|
|
http_call $DNS_CONTAINER_NAME $DNS_HTTP_PORT GET /status 2>/dev/null || true
|
|
;;
|
|
ps)
|
|
[ $# -eq 0 ] && CONTAINERS="weave:expose $(docker ps -q)" || CONTAINERS="$@"
|
|
with_container_addresses echo_addresses $CONTAINERS
|
|
;;
|
|
version)
|
|
[ $# -eq 0 ] || usage
|
|
echo weave script $SCRIPT_VERSION
|
|
ask_version $CONTAINER_NAME $IMAGE || true
|
|
ask_version $DNS_CONTAINER_NAME $DNS_IMAGE || true
|
|
if ! EXEC_IMAGE_ID=$(docker inspect --format='{{.Id}}' $EXEC_IMAGE 2>/dev/null) ; then
|
|
echo "Unable to find $EXEC_IMAGE image." >&2
|
|
else
|
|
EXEC_VERSION=$(docker images --no-trunc | grep $EXEC_IMAGE_ID | grep -v latest | tr -s ' ' | cut -d ' ' -f 2 | tr "\n" ' ')
|
|
if [ -n "$EXEC_VERSION" ] ; then
|
|
echo "weave exec $EXEC_VERSION"
|
|
else
|
|
echo "weave exec (unreleased version)"
|
|
fi
|
|
fi
|
|
;;
|
|
run)
|
|
[ $# -gt 0 ] || usage
|
|
if [ "$1" = "--with-dns" ] ; then
|
|
shift 1
|
|
dns_args "$@"
|
|
fi
|
|
collect_cidr_args "$@"
|
|
shift $CIDR_COUNT
|
|
CONTAINER=$(docker run $DNS_ARGS -d "$@")
|
|
create_bridge
|
|
get_ipam_cidr $CONTAINER $CONTAINER
|
|
with_container_netns $CONTAINER attach $CIDR_ARGS >/dev/null
|
|
tell_dns PUT $CONTAINER $CIDR_ARGS
|
|
echo $CONTAINER
|
|
;;
|
|
dns-args)
|
|
dns_args "$@"
|
|
echo -n $DNS_ARGS
|
|
;;
|
|
docker-bridge-ip)
|
|
docker_bridge_ip
|
|
echo -n $DOCKER_BRIDGE_IP
|
|
;;
|
|
start)
|
|
collect_cidr_args "$@"
|
|
shift $CIDR_COUNT
|
|
[ $# -eq 1 ] || usage
|
|
CONTAINER_ID="$1"
|
|
create_bridge
|
|
CONTAINER=$(docker start $CONTAINER_ID)
|
|
get_ipam_cidr $CONTAINER_ID $CONTAINER
|
|
with_container_netns $CONTAINER_ID attach $CIDR_ARGS >/dev/null
|
|
tell_dns PUT $CONTAINER_ID $CIDR_ARGS
|
|
echo $CONTAINER
|
|
;;
|
|
attach)
|
|
collect_cidr_args "$@"
|
|
shift $CIDR_COUNT
|
|
[ $# -eq 1 ] || usage
|
|
CONTAINER_ID="$1"
|
|
create_bridge
|
|
get_ipam_cidr $CONTAINER_ID
|
|
with_container_netns $CONTAINER_ID attach $CIDR_ARGS >/dev/null
|
|
tell_dns PUT $CONTAINER_ID $CIDR_ARGS
|
|
;;
|
|
detach)
|
|
collect_cidr_args "$@"
|
|
shift $CIDR_COUNT
|
|
[ $# -eq 1 ] || usage
|
|
CONTAINER_ID="$1"
|
|
with_container_netns $CONTAINER_ID detach $CIDR_ARGS >/dev/null
|
|
tell_dns DELETE $CONTAINER_ID $CIDR_ARGS
|
|
;;
|
|
dns-add)
|
|
collect_ip_args "$@"
|
|
shift $IP_COUNT
|
|
[ $# -ge 1 ] || usage
|
|
CONTAINER_ID="$1"
|
|
if [ $# -eq 1 ]; then
|
|
tell_dns PUT $CONTAINER_ID $IP_ARGS
|
|
else
|
|
[ $# -eq 3 -a "$2" = "-h" ] || usage
|
|
FQDN="$3"
|
|
tell_dns_fqdn PUT $CONTAINER_ID $FQDN $IP_ARGS
|
|
fi
|
|
;;
|
|
dns-remove)
|
|
collect_ip_args "$@"
|
|
shift $IP_COUNT
|
|
[ $# -eq 1 ] || usage
|
|
CONTAINER_ID="$1"
|
|
tell_dns DELETE $CONTAINER_ID $IP_ARGS
|
|
;;
|
|
expose)
|
|
collect_cidr_args "$@"
|
|
shift $CIDR_COUNT
|
|
get_ipam_cidr $CONTAINER_NAME weave:expose
|
|
if [ $# -eq 0 ]; then
|
|
FQDN=""
|
|
else
|
|
[ $# -eq 2 -a "$1" = "-h" ] || usage
|
|
FQDN="$2"
|
|
fi
|
|
create_bridge --without-ethtool
|
|
for CIDR in $CIDR_ARGS; do
|
|
if ! ip addr show dev $BRIDGE | grep -qF $CIDR
|
|
then
|
|
ip addr add dev $BRIDGE $CIDR
|
|
arp_update $BRIDGE $CIDR
|
|
add_iptables_rule nat WEAVE -d $CIDR ! -s $CIDR -j MASQUERADE
|
|
add_iptables_rule nat WEAVE -s $CIDR ! -d $CIDR -j MASQUERADE
|
|
if [ "$FQDN" ]; then
|
|
http_call $DNS_CONTAINER_NAME $DNS_HTTP_PORT PUT /name/weave:expose/${CIDR%/*} --data-urlencode "fqdn=$FQDN" 2>/dev/null || true
|
|
fi
|
|
fi
|
|
done
|
|
;;
|
|
hide)
|
|
collect_cidr_args "$@"
|
|
shift $CIDR_COUNT
|
|
get_ipam_cidr $CONTAINER_NAME weave:expose
|
|
create_bridge --without-ethtool
|
|
for CIDR in $CIDR_ARGS; do
|
|
if ip addr show dev $BRIDGE | grep -qF $CIDR
|
|
then
|
|
ip addr del dev $BRIDGE $CIDR
|
|
delete_iptables_rule nat WEAVE -d $CIDR ! -s $CIDR -j MASQUERADE
|
|
delete_iptables_rule nat WEAVE -s $CIDR ! -d $CIDR -j MASQUERADE
|
|
http_call $DNS_CONTAINER_NAME $DNS_HTTP_PORT DELETE /name/weave:expose/${CIDR%/*} 2>/dev/null || true
|
|
fi
|
|
done
|
|
[ $CIDR_COUNT -eq 0 ] && http_call $CONTAINER_NAME $HTTP_PORT DELETE /ip/weave:expose 2>/dev/null || true
|
|
;;
|
|
stop)
|
|
[ $# -eq 0 ] || usage
|
|
if ! docker stop $CONTAINER_NAME >/dev/null 2>&1 ; then
|
|
echo "Weave is not running." >&2
|
|
fi
|
|
docker rm -f $CONTAINER_NAME >/dev/null 2>&1 || true
|
|
conntrack -D -p udp --dport $PORT >/dev/null 2>&1 || true
|
|
;;
|
|
stop-dns)
|
|
[ $# -eq 0 ] || usage
|
|
if ! docker stop $DNS_CONTAINER_NAME >/dev/null 2>&1 ; then
|
|
echo "WeaveDNS is not running." >&2
|
|
fi
|
|
docker rm -f $DNS_CONTAINER_NAME >/dev/null 2>&1 || true
|
|
;;
|
|
reset)
|
|
[ $# -eq 0 ] || usage
|
|
http_call $CONTAINER_NAME $HTTP_PORT DELETE /peer >/dev/null 2>&1 || true
|
|
docker stop $CONTAINER_NAME >/dev/null 2>&1 || true
|
|
docker stop $DNS_CONTAINER_NAME >/dev/null 2>&1 || true
|
|
docker rm -f $CONTAINER_NAME >/dev/null 2>&1 || true
|
|
docker rm -f $DNS_CONTAINER_NAME >/dev/null 2>&1 || true
|
|
conntrack -D -p udp --dport $PORT >/dev/null 2>&1 || true
|
|
destroy_bridge
|
|
for LOCAL_IFNAME in $(ip link show | grep v${CONTAINER_IFNAME}pl | cut -d ' ' -f 2 | tr -d ':') ; do
|
|
ip link del $LOCAL_IFNAME
|
|
done
|
|
;;
|
|
rmpeer)
|
|
[ $# -eq 1 ] || usage
|
|
PEER=$1
|
|
http_call $CONTAINER_NAME $HTTP_PORT DELETE /peer/$PEER
|
|
;;
|
|
*)
|
|
echo "Unknown weave command '$COMMAND'" >&2
|
|
usage
|
|
;;
|
|
esac
|