Attach Elastic APM Java agent to docker containers

attach.sh

#!/usr/bin/env bash
set -ex

attach () {
    if [[ $(docker inspect ${container_id} | jq --raw-output .[0].Config.Cmd[0]) == java ]]
    then
        echo attaching to $(docker ps --no-trunc | grep ${container_id})
        docker cp /Users/felixbarnsteiner/Applications/apm/apm-agent-attach-1.6.1.jar ${container_id}:/apm-agent-attach.jar
        docker exec ${container_id} java -jar /apm-agent-attach.jar --config
    fi
}

for container_id in $(docker ps --quiet --no-trunc) ; do
    attach
done

docker events --filter 'event=start' --format '{{.ID}}' |
while IFS= read -r container_id
do
    attach
done