swarm-docker launch

gistfile1.txt

#!/bin/bash

num_dockers=3
docker_image=dind

########################################
deferred=()
deferred_pid=$BASHPID
run_deferred() {
  if [[ "$deferred_pid" != $BASHPID ]]; then
    # we are a subshell, don't execute statements created in parent
    return
  fi
  set +e
  for (( i=${#deferred[@]} - 1; i >= 0; i-- )); do
    eval "${deferred[i]}"
  done
}
trap run_deferred EXIT
defer() {
  if [[ "$deferred_pid" != $BASHPID ]]; then
    # $deferred was inherited from a parent (we are a subshell). re-initialize it
    deferred=()
    deferred_pid=$BASHPID
    trap run_deferred EXIT
  fi
  deferred+=( "$cmd" )
}
defera() {
  printf -v cmd '%q ' "$@"
  defer "$cmd"
}
########################################
set -e
cd "$(git rev-parse --show-toplevel)"

docker_start() {
  i="$1"
  id="$(docker run -d --privileged "$docker_image" docker -dD -H tcp://0.0.0.0:2375)"
  defera docker rm -v -f "$id"
  defera docker stop "$id"
  ip=$(docker inspect --format '{{.NetworkSettings.IPAddress}}' "$id")
  export DOCKER_CONTAINER_ID_"$i"="$id"
  export DOCKER_IP_"$i"="$ip"
  export DOCKER_ADDR_"$i"="$ip:2375"
  export DOCKER_HOST_"$i"="tcp://$ip:2375"
  echo "$ip:2375" >> "$SWARM_DISCOVERY_FILE"
  echo "Docker $1: $ip:2375 - DOCKER_HOST=\$DOCKER_HOST_$i"
}
docker_wait_ready() {
  docker_host_var="DOCKER_HOST_$i"
  timeout="$(( $(date +%s) + 5 ))"
  while (( $(date +%s) < timeout )); do
    if DOCKER_HOST="${!docker_host_var}" docker info &>/dev/null; then
      return
    fi
    sleep 0.2
  done

  echo "Timed out waiting for docker:$i (${!docker_host_var}) to start"
  return 1
}

export SWARM_DISCOVERY_FILE="$(pwd)/.swarm_discovery"
:>"$SWARM_DISCOVERY_FILE"
export SWARM_DISCOVERY="file://$(pwd)/.swarm_discovery"
echo "Swarm discovery: $SWARM_DISCOVERY - \$SWARM_DISCOVERY"

for (( i=0; i<num_dockers; i++ )); do
  docker_start $i
done
for (( i=0; i<num_dockers; i++ )); do
  docker_wait_ready $i
done


# determine which swarm binary to use
# look through possible locations, and choose the one with the latest mtime
swarm="$(command -v swarm)"
swarm_mtime="$(stat --format '%Y' "$swarm")"

if [[ -x swarm ]]; then
  swarm_dev='./swarm'
  swarm_dev_mtime="$(stat --format '%Y' "$swarm_dev")"
  if (( swarm_dev_mtime > swarm_mtime )); then
    swarm="$swarm_dev"
    swarm_mtime="$swarm_dev_mtime"
  fi
fi


$swarm --debug manage --host 127.0.0.1:2375 > >(logger -t swarm -p user.info) 2> >(logger -t swarm -p user.err) </dev/null &
swarm_pid="$!"
defera kill $swarm_pid
export SWARM_HOST="127.0.0.1:2375"
echo "Swarm: $SWARM_HOST - DOCKER_HOST=\$SWARM_HOST"

SHELLSTACK="$SHELLSTACK docker-swarm" DOCKER_HOST="tcp://$SWARM_HOST" $SHELL