Rolling CoreOS fleet restart

roll-restart.sh

#!/bin/sh

SERVICE=$1
BRANCH=$2
HEALTH_URL=$3

if [ -z "$HEALTH_URL" ]; then
  echo "Syntax: roll-restart someservice somebranch http://localhost:80"
  exit
fi

MACHINE_IPS=$(fleetctl list-machines | grep ${SERVICE}-${BRANCH} | awk '{print $2}');

for IP in $MACHINE_IPS; do

  echo "$SERVICE | $BRANCH | $IP -> Connecting"

  ssh -A core@${IP} 'bash -s' << EOF

    echo "$SERVICE | $BRANCH | $IP -> Removing from ELB"
    sudo systemctl stop ${SERVICE}-elb && sleep 30

    echo "$SERVICE | $BRANCH | $IP -> Restarting"
    sudo systemctl restart ${SERVICE}@${BRANCH}

    echo "$SERVICE | $BRANCH | $IP -> Waiting for $HEALTH_URL to respond"
    until curl --output /dev/null --silent --head --fail ${HEALTH_URL}; do
        echo "$SERVICE | $BRANCH | $IP -> ..."
        sleep 5
    done

    echo "$SERVICE | $BRANCH | $IP -> Adding back to ELB"
    sudo systemctl start ${SERVICE}-elb
EOF

done