github.com/technosophos/deis@v1.7.1-0.20150915173815-f9005256004b/registry/bin/boot (about)

     1  #!/usr/bin/env bash
     2  #
     3  # This script is designed to be run inside the container
     4  #
     5  
     6  # fail hard and fast even on pipelines
     7  set -eo pipefail
     8  
     9  # set debug based on envvar
    10  [[ $DEBUG ]] && set -x
    11  
    12  # configure etcd
    13  export ETCD_PORT="${ETCD_PORT:-4001}"
    14  export ETCD="$HOST:$ETCD_PORT"
    15  export ETCD_PATH="${ETCD_PATH:-/deis/registry}"
    16  export HOST_ETCD_PATH="${HOST_ETCD_PATH:-/deis/registry/hosts/$HOST}"
    17  export ETCD_TTL="${ETCD_TTL:-20}"
    18  
    19  # run.sh requires $REGISTRY_PORT
    20  export REGISTRY_PORT="${PORT:-5000}"
    21  
    22  export BUCKET_NAME="${BUCKET_NAME:-registry}"
    23  
    24  # wait for etcd to be available
    25  until etcdctl --no-sync -C "$ETCD" ls >/dev/null 2>&1; do
    26  	echo "waiting for etcd at $ETCD..."
    27  	sleep $((ETCD_TTL/2))  # sleep for half the TTL
    28  done
    29  
    30  # wait until etcd has discarded potentially stale values
    31  sleep $((ETCD_TTL+1))
    32  
    33  function etcd_set_default {
    34    set +e
    35    ERROR="$(etcdctl --no-sync -C "$ETCD" mk "$ETCD_PATH/$1" "$2" 2>&1 >/dev/null)"
    36  
    37    if [[ $? -ne 0 ]] && echo "$ERROR" | grep -iqve "key already exists"; then
    38      echo "etcd_set_default: an etcd error occurred ($ERROR)"
    39      echo "aborting..."
    40      exit 1
    41    fi
    42    set -e
    43  }
    44  
    45  # seed initial service configuration if necessary
    46  etcd_set_default protocol http
    47  etcd_set_default bucketName "${BUCKET_NAME}"
    48  
    49  # wait for confd to run once and install initial templates
    50  until confd -onetime -node "$ETCD" --confdir /app --log-level error; do
    51  	echo "registry: waiting for confd to write initial templates..."
    52  	sleep $((ETCD_TTL/2))  # sleep for half the TTL
    53  done
    54  
    55  # ensure registry bucket exists
    56  /app/bin/create_bucket
    57  
    58  # spawn the service in the background
    59  cd /docker-registry
    60  sudo -E -u registry docker-registry &
    61  SERVICE_PID=$!
    62  
    63  # smart shutdown on SIGINT and SIGTERM
    64  function on_exit() {
    65  	kill -TERM $SERVICE_PID
    66  	wait $SERVICE_PID 2>/dev/null
    67  	exit 0
    68  }
    69  trap on_exit INT TERM
    70  
    71  # spawn confd in the background to update services based on etcd changes
    72  confd -node "$ETCD" --confdir /app --log-level error --interval 5 &
    73  
    74  echo deis-registry running...
    75  
    76  # publish the service to etcd using the injected EXTERNAL_PORT
    77  if [[ ! -z $EXTERNAL_PORT ]]; then
    78  
    79  	# configure service discovery
    80  	PORT=${PORT:-5000}
    81  	PROTO=${PROTO:-tcp}
    82  
    83  	set +e
    84  
    85  	# wait for the service to become available on PORT
    86  	sleep 1 && while [[ -z $(netstat -lnt | awk "\$6 == \"LISTEN\" && \$4 ~ \".$PORT\" && \$1 ~ \"$PROTO.?\"") ]] ; do sleep 1; done
    87  
    88  	# while the port is listening, publish to etcd
    89  	while [[ ! -z $(netstat -lnt | awk "\$6 == \"LISTEN\" && \$4 ~ \".$PORT\" && \$1 ~ \"$PROTO.?\"") ]] ; do
    90  		if etcdctl --no-sync -C "$ETCD" mk "${ETCD_PATH}/masterLock" "$HOSTNAME" --ttl "$ETCD_TTL" >/dev/null 2>&1 \
    91  		|| [[ $(etcdctl --no-sync -C "$ETCD" get "${ETCD_PATH}/masterLock") == "$HOSTNAME" ]] ; then
    92  			etcdctl --no-sync -C "$ETCD" set "$ETCD_PATH/host" "$HOST" --ttl "$ETCD_TTL" >/dev/null
    93  			etcdctl --no-sync -C "$ETCD" set "$ETCD_PATH/port" "$EXTERNAL_PORT" --ttl "$ETCD_TTL" >/dev/null
    94  			etcdctl --no-sync -C "$ETCD" update "${ETCD_PATH}/masterLock" "$HOSTNAME" --ttl "$ETCD_TTL" >/dev/null
    95  		fi
    96  		etcdctl --no-sync -C "$ETCD" set "$HOST_ETCD_PATH/host" "$HOST" --ttl "$ETCD_TTL" >/dev/null
    97  		etcdctl --no-sync -C "$ETCD" set "$HOST_ETCD_PATH/port" "$EXTERNAL_PORT" --ttl "$ETCD_TTL" >/dev/null
    98  
    99  		sleep $((ETCD_TTL/2)) # sleep for half the TTL
   100  	done
   101  
   102  	# if the loop quits, something went wrong
   103  	exit 1
   104  
   105  fi
   106  
   107  wait