Watches docker to see if any of your containers have exited abnormally and notifies slack

docker-watch.sh

#!/bin/bash

INSTANCE=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)
SLACK_CHANNEL='#ops-notifications'
SLACK_URL='<%= node['base']['slack']['hook'] %>'
SLACK_USERNAME='DockerBot'

for CONTAINER in $(docker ps -a|grep -v CONTAINER|awk '{print $1}')
do
    STATE=$(docker inspect -f '{{.State.Running}}' ${CONTAINER})
    # We're only concerned with containers that aren't running
    if [ "$STATE" != "true" ];
    then
        EXIT_CODE=$(docker inspect -f '{{.State.ExitCode}}' ${CONTAINER})
        # Don't notify Slack on normal container shutdown
        if [ ${EXIT_CODE} -gt 0 ];
        then
          CONTAINER_NAME=$(docker inspect -f '{{.Config.Image}}' ${CONTAINER}|awk -F/ '{print $2}'|awk -F: '{print $1}')
          SLACK_TEXT="Container ${CONTAINER_NAME} running on ${INSTANCE} exited with code ${EXIT_CODE}"
          curl -X POST --data "payload={\"channel\": \"${SLACK_CHANNEL}\", \"username\": \"${SLACK_USERNAME}\", \"text\": \"${SLACK_TEXT}\"}" ${SLACK_URL}
        fi
    fi
done