diff --git a/common/utils.go b/common/utils.go
index ce9e09e3..5aa93219 100644
--- a/common/utils.go
+++ b/common/utils.go
@@ -1,7 +1,6 @@
 package common
 
 import (
-	"fmt"
 	"github.com/vishvananda/netlink"
 	"github.com/vishvananda/netns"
 	"net"
@@ -49,10 +48,10 @@ type NetDev struct {
 }
 
 // Search the network namespace of a process for interfaces matching a predicate
-func FindNetDevs(procPath string, processID int, match func(string) bool) ([]NetDev, error) {
+func FindNetDevs(processID int, match func(string) bool) ([]NetDev, error) {
 	var netDevs []NetDev
 
-	ns, err := netns.GetFromPath(fmt.Sprintf("%s/%d/ns/net", procPath, processID))
+	ns, err := netns.GetFromPid(processID)
 	if err != nil {
 		return nil, err
 	}
@@ -84,15 +83,15 @@ func FindNetDevs(procPath string, processID int, match func(string) bool) ([]Net
 }
 
 // Lookup the weave interface of a container
-func GetWeaveNetDevs(procPath string, processID int) ([]NetDev, error) {
-	return FindNetDevs(procPath, processID, func(name string) bool {
+func GetWeaveNetDevs(processID int) ([]NetDev, error) {
+	return FindNetDevs(processID, func(name string) bool {
 		return strings.HasPrefix(name, "ethwe")
 	})
 }
 
 // Get the weave bridge interface
-func GetBridgeNetDev(procPath, bridgeName string) ([]NetDev, error) {
-	return FindNetDevs(procPath, 1, func(name string) bool {
+func GetBridgeNetDev(bridgeName string) ([]NetDev, error) {
+	return FindNetDevs(1, func(name string) bool {
 		return name == bridgeName
 	})
 }
diff --git a/prog/weaveproxy/main.go b/prog/weaveproxy/main.go
index 78be8f28..47ad90b3 100644
--- a/prog/weaveproxy/main.go
+++ b/prog/weaveproxy/main.go
@@ -68,7 +68,6 @@ func main() {
 	c.Image = getenv("EXEC_IMAGE", "weaveworks/weaveexec")
 	c.DockerBridge = getenv("DOCKER_BRIDGE", "docker0")
 	c.DockerHost = getenv("DOCKER_HOST", "unix:///var/run/docker.sock")
-	c.ProcPath = getenv("PROCFS", "/proc")
 
 	p, err := proxy.NewProxy(c)
 	if err != nil {
diff --git a/prog/weaveutil/addrs.go b/prog/weaveutil/addrs.go
index ddd0de62..4fc38575 100644
--- a/prog/weaveutil/addrs.go
+++ b/prog/weaveutil/addrs.go
@@ -12,15 +12,13 @@ func containerAddrs(args []string) error {
 	}
 	bridgeName := args[0]
 
-	procPath := procDir()
-
 	c, err := docker.NewVersionedClientFromEnv("1.18")
 	if err != nil {
 		return err
 	}
 
 	for _, containerID := range args[1:] {
-		netDevs, err := getNetDevs(procPath, bridgeName, c, containerID)
+		netDevs, err := getNetDevs(bridgeName, c, containerID)
 		if err != nil {
 			if _, ok := err.(*docker.NoSuchContainer); ok {
 				continue
@@ -41,9 +39,9 @@ func containerAddrs(args []string) error {
 	return nil
 }
 
-func getNetDevs(procPath, bridgeName string, c *docker.Client, containerID string) ([]common.NetDev, error) {
+func getNetDevs(bridgeName string, c *docker.Client, containerID string) ([]common.NetDev, error) {
 	if containerID == "weave:expose" {
-		return common.GetBridgeNetDev(procPath, bridgeName)
+		return common.GetBridgeNetDev(bridgeName)
 	}
 
 	container, err := c.InspectContainer(containerID)
@@ -51,5 +49,5 @@ func getNetDevs(procPath, bridgeName string, c *docker.Client, containerID strin
 		return nil, err
 	}
 
-	return common.GetWeaveNetDevs(procPath, container.State.Pid)
+	return common.GetWeaveNetDevs(container.State.Pid)
 }
diff --git a/prog/weaveutil/docker_tls_args.go b/prog/weaveutil/docker_tls_args.go
index 9f889657..83dff5ec 100644
--- a/prog/weaveutil/docker_tls_args.go
+++ b/prog/weaveutil/docker_tls_args.go
@@ -1,6 +1,4 @@
 // docker_tls_args: find the docker daemon's tls args
-// This reimplements pgrep, because pgrep will only look in /proc, but not in
-// $PROCFS.
 package main
 
 import (
@@ -16,7 +14,7 @@ func dockerTLSArgs(args []string) error {
 	if len(args) > 0 {
 		cmdUsage("docker-tls-args", "")
 	}
-	procRoot := procDir()
+	procRoot := "/proc"
 	dirEntries, err := ioutil.ReadDir(procRoot)
 	if err != nil {
 		return err
diff --git a/prog/weaveutil/main.go b/prog/weaveutil/main.go
index 8522f824..1d737341 100644
--- a/prog/weaveutil/main.go
+++ b/prog/weaveutil/main.go
@@ -60,11 +60,3 @@ func cmdUsage(cmd string, usage string) {
 	fmt.Fprintf(os.Stderr, "usage: weaveutil %s %s\n", cmd, usage)
 	os.Exit(1)
 }
-
-func procDir() string {
-	procDir := os.Getenv("PROCFS")
-	if procDir == "" {
-		procDir = "/proc"
-	}
-	return procDir
-}
diff --git a/proxy/common.go b/proxy/common.go
index 0bc2b28a..cd827e54 100644
--- a/proxy/common.go
+++ b/proxy/common.go
@@ -27,7 +27,6 @@ func callWeave(args ...string) ([]byte, []byte, error) {
 	cmd := exec.Command("./weave", args...)
 	cmd.Env = []string{
 		"PATH=/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
-		"PROCFS=/hostproc",
 	}
 
 	propagateEnv := func(key string) {
diff --git a/proxy/proxy.go b/proxy/proxy.go
index a287cc8f..396e57a1 100644
--- a/proxy/proxy.go
+++ b/proxy/proxy.go
@@ -64,7 +64,6 @@ type Config struct {
 	NoMulticastRoute    bool
 	DockerBridge        string
 	DockerHost          string
-	ProcPath            string
 }
 
 type wait struct {
@@ -149,7 +148,7 @@ func NewProxy(c Config) (*Proxy, error) {
 	p.client = client.Client
 
 	if !p.WithoutDNS {
-		netDevs, err := GetBridgeNetDev(c.ProcPath, c.DockerBridge)
+		netDevs, err := GetBridgeNetDev(c.DockerBridge)
 		if err != nil {
 			return nil, err
 		}
@@ -583,7 +582,7 @@ func (proxy *Proxy) updateContainerNetworkSettings(container jsonObject) error {
 	if err := proxy.waitForStartByIdent(containerID); err != nil {
 		return err
 	}
-	netDevs, err := GetWeaveNetDevs(proxy.ProcPath, pid)
+	netDevs, err := GetWeaveNetDevs(pid)
 	if err != nil || len(netDevs) == 0 || len(netDevs[0].CIDRs) == 0 {
 		return err
 	}
diff --git a/weave b/weave
index f899d5fc..6364bcfd 100755
--- a/weave
+++ b/weave
@@ -110,9 +110,7 @@ docker_sock_options() {
 }
 
 exec_remote() {
-    docker $DOCKER_CLIENT_ARGS run --rm --privileged --net=host $(docker_sock_options) \
-        -v /proc:/hostproc \
-        -e PROCFS=/hostproc \
+    docker $DOCKER_CLIENT_ARGS run --rm --privileged --net=host --pid=host $(docker_sock_options) \
         -e DOCKERHUB_USER="$DOCKERHUB_USER" \
         -e WEAVE_VERSION \
         -e WEAVE_DEBUG \
@@ -342,7 +340,6 @@ PLUGIN_IMAGE=$BASE_PLUGIN_IMAGE:$IMAGE_VERSION
 PLUGIN_CONTAINER_NAME=weaveplugin
 VOLUMES_CONTAINER_NAME=weavevolumes-$IMAGE_VERSION
 
-PROCFS=${PROCFS:-/proc}
 DOCKER_BRIDGE=${DOCKER_BRIDGE:-docker0}
 CONTAINER_NAME=${WEAVE_CONTAINER_NAME:-weave}
 BRIDGE=weave
@@ -466,8 +463,7 @@ util_op() {
     if command_exists weaveutil ; then
         weaveutil "$@"
     else
-        docker run --rm --privileged --net=host $(docker_sock_options) \
-            -v /proc:/hostproc -e PROCFS=/hostproc \
+        docker run --rm --privileged --net=host --pid=host $(docker_sock_options) \
             --entrypoint=/usr/bin/weaveutil $EXEC_IMAGE "$@"
     fi
 }
@@ -746,7 +742,7 @@ with_container_netns() {
         exit 1
     fi
 
-    CONTAINER_NETNS=$PROCFS/$CONTAINER_PID/ns/net
+    CONTAINER_NETNS=/proc/$CONTAINER_PID/ns/net
     LOCAL_IFNAME="v${CONTAINER_IFNAME}pl${CONTAINER_PID}"
     GUEST_IFNAME="v${CONTAINER_IFNAME}pg${CONTAINER_PID}"
     IP_TMPOUT=/tmp/weave_ip_out_$$
@@ -758,7 +754,7 @@ with_container_netns() {
     shift 1
     if ! "$@" >$IP_TMPOUT 2>$IP_TMPERR ; then
         STATUS=1
-        if [ ! -d $PROCFS/$CONTAINER_PID ] ; then
+        if [ ! -d /proc/$CONTAINER_PID ] ; then
             echo "Container $CONTAINER died" >&2
         else
             echo "Failure during network configuration for container $CONTAINER:" >&2
@@ -1678,12 +1674,10 @@ launch_proxy() {
            --label=weavevolumes --entrypoint=/bin/false $EXEC_IMAGE >/dev/null
     fi
     start_if_necessary proxy $PROXY_CONTAINER_NAME $EXEC_IMAGE \
-        --privileged --net=host $(docker_sock_options) \
+        --privileged --net=host --pid=host $(docker_sock_options) \
         $PROXY_VOLUMES \
         --volumes-from $VOLUMES_CONTAINER_NAME \
         -v /var/run/weave:/var/run/weave \
-        -v /proc:/hostproc \
-        -e PROCFS=/hostproc \
         -e DOCKER_BRIDGE \
         -e WEAVE_DEBUG \
         -e COVERAGE \