diff options
Diffstat (limited to 'kubernetes/msb/components/msb-consul/resources')
| -rwxr-xr-x | kubernetes/msb/components/msb-consul/resources/docker-entrypoint.sh | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/kubernetes/msb/components/msb-consul/resources/docker-entrypoint.sh b/kubernetes/msb/components/msb-consul/resources/docker-entrypoint.sh new file mode 100755 index 0000000000..0cd46167e4 --- /dev/null +++ b/kubernetes/msb/components/msb-consul/resources/docker-entrypoint.sh @@ -0,0 +1,100 @@ +#!/usr/bin/dumb-init /bin/sh +set -e +set -x + +# Note above that we run dumb-init as PID 1 in order to reap zombie processes +# as well as forward signals to all processes in its session. Normally, sh +# wouldn't do either of these functions so we'd leak zombies as well as do +# unclean termination of all our sub-processes. +# As of docker 1.13, using docker run --init achieves the same outcome. + +# You can set CONSUL_BIND_INTERFACE to the name of the interface you'd like to +# bind to and this will look up the IP and pass the proper -bind= option along +# to Consul. +CONSUL_BIND= +if [ -n "$CONSUL_BIND_INTERFACE" ]; then + CONSUL_BIND_ADDRESS=$(ip -o -4 addr list $CONSUL_BIND_INTERFACE | head -n1 | awk '{print $4}' | cut -d/ -f1) + if [ -z "$CONSUL_BIND_ADDRESS" ]; then + echo "Could not find IP for interface '$CONSUL_BIND_INTERFACE', exiting" + exit 1 + fi + + CONSUL_BIND="-bind=$CONSUL_BIND_ADDRESS" + echo "==> Found address '$CONSUL_BIND_ADDRESS' for interface '$CONSUL_BIND_INTERFACE', setting bind option..." +fi + +# You can set CONSUL_CLIENT_INTERFACE to the name of the interface you'd like to +# bind client intefaces (HTTP, DNS, and RPC) to and this will look up the IP and +# pass the proper -client= option along to Consul. +CONSUL_CLIENT= +if [ -n "$CONSUL_CLIENT_INTERFACE" ]; then + CONSUL_CLIENT_ADDRESS=$(ip -o -4 addr list $CONSUL_CLIENT_INTERFACE | head -n1 | awk '{print $4}' | cut -d/ -f1) + if [ -z "$CONSUL_CLIENT_ADDRESS" ]; then + echo "Could not find IP for interface '$CONSUL_CLIENT_INTERFACE', exiting" + exit 1 + fi + + CONSUL_CLIENT="-client=$CONSUL_CLIENT_ADDRESS" + echo "==> Found address '$CONSUL_CLIENT_ADDRESS' for interface '$CONSUL_CLIENT_INTERFACE', setting client option..." +fi + +# CONSUL_DATA_DIR is exposed as a volume for possible persistent storage. The +# CONSUL_CONFIG_DIR isn't exposed as a volume but you can compose additional +# config files in there if you use this image as a base, or use CONSUL_LOCAL_CONFIG +# below. +CONSUL_DATA_DIR=/consul/data +CONSUL_CONFIG_DIR=/consul/config + +# You can also set the CONSUL_LOCAL_CONFIG environemnt variable to pass some +# Consul configuration JSON without having to bind any volumes. +if [ -n "$CONSUL_LOCAL_CONFIG" ]; then + echo "$CONSUL_LOCAL_CONFIG" > "$CONSUL_CONFIG_DIR/local.json" +fi + +# If the user is trying to run Consul directly with some arguments, then +# pass them to Consul. +if [ "${1:0:1}" = '-' ]; then + set -- consul "$@" +fi + +# Look for Consul subcommands. +if [ "$1" = 'agent' ]; then + shift + set -- consul agent \ + -data-dir="$CONSUL_DATA_DIR" \ + -config-dir="$CONSUL_CONFIG_DIR" \ + $CONSUL_BIND \ + $CONSUL_CLIENT \ + "$@" +elif [ "$1" = 'version' ]; then + # This needs a special case because there's no help output. + set -- consul "$@" +elif consul --help "$1" 2>&1 | grep -q "consul $1"; then + # We can't use the return code to check for the existence of a subcommand, so + # we have to use grep to look for a pattern in the help output. + set -- consul "$@" +fi + +# If we are running Consul, make sure it executes as the proper user. +if [ "$1" = 'consul' ]; then + # If the data or config dirs are bind mounted then chown them. + # Note: This checks for root ownership as that's the most common case. + if [ "$(stat -c %u /consul/data)" != "$(id -u consul)" ]; then + chown consul:consul /consul/data + fi + if [ "$(stat -c %u /consul/config)" != "$(id -u consul)" ]; then + chown consul:consul /consul/config + fi + + # If requested, set the capability to bind to privileged ports before + # we drop to the non-root user. Note that this doesn't work with all + # storage drivers (it won't work with AUFS). + if [ ! -z ${CONSUL_ALLOW_PRIVILEGED_PORTS+x} ]; then + setcap "cap_net_bind_service=+ep" /bin/consul + fi + +# Instead of using this we run our pod as a non-root user. +# set -- su-exec consul:consul "$@" +fi + +exec "$@" |