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/
boot
executable file
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/
boot
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#!/bin/bash
#
# This script is designed to be run inside the container
#
# fail hard and fast even on pipelines
set -eo pipefail
# set debug based on envvar
[[ $DEBUG ]] && set -x
# configure etcd
export ETCD=${ETCD:-172.17.42.1:4001}
export ETCD_PATH=${ETCD_PATH:-/deis/router}
export ETCD_TTL=${ETCD_TTL:-10}
# wait for etcd to be available
until etcdctl --no-sync -C $ETCD ls >/dev/null; do
echo "waiting for etcd at $ETCD..."
sleep $(($ETCD_TTL/2)) # sleep for half the TTL
done
# wait until etcd has discarded potentially stale values
sleep $(($ETCD_TTL+1))
# seed initial service configuration if necessary
if ! etcdctl --no-sync -C $ETCD ls /deis/services >/dev/null 2>&1; then
etcdctl --no-sync -C $ETCD mkdir /deis/services || true >/dev/null 2>&1
etcdctl --no-sync -C $ETCD set $ETCD_PATH/port ${PORT:-80} >/dev/null
fi
# wait for confd to run once and install initial templates
until confd -onetime -node $ETCD -config-file /app/confd.toml >/dev/null 2>/dev/null; do
echo "router: waiting for confd to write initial templates..."
sleep $(($ETCD_TTL/2)) # sleep for half the TTL
done
# spawn the service in the background
echo "Starting Nginx..."
/usr/sbin/nginx &
SERVICE_PID=$!
# smart shutdown on SIGINT and SIGTERM
function on_exit() {
kill -TERM $SERVICE_PID
wait $SERVICE_PID 2>/dev/null
}
trap on_exit INT TERM
# spawn confd in the background to update services based on etcd changes
confd -node $ETCD -config-file /app/confd.toml &
CONFD_PID=$!
echo deis-router running...
# publish the service to etcd using the injected HOST and PORT
if [[ ! -z $PUBLISH ]]; then
# configure service discovery
HOST=${HOST:-localhost}
PORT=${PORT:-80}
PROTO=${PROTO:-tcp}
# wait for the service to become available on PUBLISH port
sleep 1 && while [[ -z $(netstat -lnt | awk "\$6 == \"LISTEN\" && \$4 ~ \".$PUBLISH\" && \$1 ~ \"$PROTO.?\"") ]] ; do sleep 1; done
# while the port is listening, publish to etcd
while [[ ! -z $(netstat -lnt | awk "\$6 == \"LISTEN\" && \$4 ~ \".$PUBLISH\" && \$1 ~ \"$PROTO.?\"") ]] ; do
etcdctl --no-sync -C $ETCD set $ETCD_PATH/host $HOST --ttl $ETCD_TTL >/dev/null
etcdctl --no-sync -C $ETCD set $ETCD_PATH/port $PORT --ttl $ETCD_TTL >/dev/null
sleep $(($ETCD_TTL/2)) # sleep for half the TTL
done
# if the loop quits, something went wrong
exit 1
fi
wait