healthcheck

[brettmc]

this is a feature request. docker 1.12 added a HEALTHCHECK command, which would be a useful feature IMO, particularly if deploying activemq into a docker swarm...

I've had a play with trying to run something from a shell which might indicate a working activemq instance (I'm imagining that listing brokers and getting a non-zero response, or putting a message onto a queue and reading it back) - but I haven't had any success yet.

[pprazzi]

I had limited success using netcat

    healthcheck:
      test: nc -z localhost 8311 || exit 1
      interval: 20s
      timeout: 10s
      retries: 10

where 8311 is to port to check

However, this seems to trigger

org.apache.activemq.broker.TransportConnection.Transport - Transport failed: java.io.EOFException INFO messages

because the client connection is not closed properly

[petr-ujezdsky]

I have found out cleaner solution, eg. via Dockerfile:

HEALTHCHECK --interval=1s \
            --start-period=10s \
            CMD ( \
                    curl \
                        --silent \
                        --show-error \
                        "http://localhost:8161/api/jolokia/exec/org.apache.activemq:type=Broker,brokerName=localhost,service=Health/healthStatus" \
                    # copy output to fd3 (grep will consume fd1)
                    | tee /dev/fd/3 \
                    | grep --silent 'Good' \
                # show curl output, from fd3
                ) 3>&1

Then see health detail via docker inspect <containerName>

...
            "Health": {
                "Status": "healthy",
                "FailingStreak": 0,
                "Log": [
                    {
                        "Start": "2019-10-02T10:56:23.3046307Z",
                        "End": "2019-10-02T10:56:23.4643366Z",
                        "ExitCode": 0,
                        "Output": "{\"request\":{\"mbean\":\"org.apache.activemq:brokerName=localhost,service=Health,type=Broker\",\"type\":\"exec\",\"operation\":\"healthStatus\"},\"value\":\"Good\",\"timestamp\":1570013783,\"status\":200}"
                    },
...