Spin up test VMs on GCE during a circle ci run and use them to run the integration tests.

test/gce.sh

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+#!/bin/bash
+# This script has a bunch of GCE-related functions:
+# ./gce.sh setup -  starts two VMs on GCE and configures them to run our integration tests
+# . ./gce.sh; ./run_all.sh - set a bunch of environment variables for the tests
+# ./gce.sh destroy - tear down the VMs
+
+set -ex
+
+KEY_FILE=/tmp/gce_private_key.json
+SSH_KEY_FILE=$HOME/.ssh/gce_ssh_key
+PROJECT=positive-cocoa-90213
+IMAGE=ubuntu-14-04
+ZONE=us-central1-a
+NUM_HOSTS=2
+
+# Setup authentication
+gcloud auth activate-service-account --key-file $KEY_FILE
+gcloud config set project $PROJECT
+
+# Delete all vms in this account
+function destroy {
+	names="$(gcloud compute instances list --format=yaml | grep "^name\:" | cut -d: -f2 | xargs echo)"
+	if [ -n "$names" ]; then
+		gcloud compute instances delete --zone $ZONE -q $names
+	fi
+}
+
+function external_ip {
+	gcloud compute instances list $1 --format=yaml | grep "^    natIP\:" | cut -d: -f2 | tr -d ' '
+}
+
+function internal_ip {
+	gcloud compute instances list $1 --format=yaml | grep "^  networkIP\:" | cut -d: -f2 | tr -d ' '
+}
+
+function install_docker_on {
+	name=$1
+	ssh -t $name sudo bash -x -s <<EOF
+apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9;
+echo deb https://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list;
+apt-get update -qq;
+apt-get install -q -y --force-yes --no-install-recommends lxc-docker ethtool;
+usermod -a -G docker vagrant;
+echo 'DOCKER_OPTS="-H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375"' >> /etc/default/docker;
+service docker restart
+EOF
+	# It seems we need a short delay for docker to start up, so I put this in
+	# a separate ssh connection.  This installs nsenter.
+	ssh -t $name sudo docker run --rm -v /usr/local/bin:/target jpetazzo/nsenter
+}
+
+# Create new set of VMS
+function setup {
+	destroy
+
+	# Create and setup some VMs
+	for i in $(seq 1 $NUM_HOSTS); do
+		name="host$i"
+		gcloud compute instances create $name --image $IMAGE --zone $ZONE
+	done
+
+	gcloud compute config-ssh --ssh-key-file $SSH_KEY_FILE
+
+	hosts=
+	for i in $(seq 1 $NUM_HOSTS); do
+		name="host$i.$ZONE.$PROJECT"
+		install_docker_on $name
+
+		# Add the remote ip to the local /etc/hosts
+		sudo -- sh -c "echo \"$(external_ip host$i) $name\" >>/etc/hosts"
+		# Add the local ips to the remote /etc/hosts
+		for j in $(seq 1 $NUM_HOSTS); do
+			ipaddr=$(internal_ip host$j)
+			othername="host$j.$ZONE.$PROJECT"
+			entry="$ipaddr $othername"
+			ssh -t $name "sudo -- sh -c \"echo \\\"$entry\\\" >>/etc/hosts\""
+		done
+	done
+}
+
+function hosts {
+	hosts=
+	args=
+	for i in $(seq 1 $NUM_HOSTS); do
+		name="host$i.$ZONE.$PROJECT"
+		hosts="$name $hosts"
+		args="--add-host=$name:$(internal_ip host$i) $args"
+	done
+	export SSH=ssh
+	export HOSTS="$hosts"
+	export WEAVE_DOCKER_ARGS="$args"
+}
+
+case "$1" in
+setup)
+	setup
+	;;
+
+hosts)
+	hosts
+	;;
+
+destroy)
+	destroy
+	;;
+esac