[question] Possible to run Containerpilot (or other init processes) as entrypoint?

Description of the issue:

Consul is useful in service discovery, and rather than running something like Registrator as a sidecar to the application, would it be possible to add ContainerPilot that is ran within the container as a type of init system (other examples for non service discovery would be s6 or tini)?

I pick those because I think they have little dependencies. I’m leaving supervisord out of the list because that requires Python, IIUC (although, that can be added with one’s own base image)

Expected behavior:

• Install containerpilot into image (for simplicity, let’s say the base image has it), or better - Can Jib do multistage builds yet?

It is a statically linked binary, written in go

# get ContainerPilot release
RUN curl -Lo /tmp/cb.tar.gz https://github.com/joyent/containerpilot... \
    && tar -xz -f /tmp/cb.tar.gz && mv /containerpilot /bin/

• contiainerpilot.json can be added into src/main/jib/app

• ENV CONTAINERPILOT=file:///app/containerpilot.json can be put into the build system

• Question: Is this possible?

ENTRYPOINT ["/bin/containerpilot"]
CMD ["java", "-cp" ...jibStuff...]

Or even with a custom entrypoint, are the JVM args exposed to a custom entrypoint script?

I’m leaning towards the thought a custom entrypoint is required to run the config templating command i.e./bin/containerpilot -config /app/containerpilot.json5

Additional Information: Feel free to ask. Disclaimer - I have only done a few projects with Containerpilot, but it is required for our containers to work “properly” in our environment and I just copy paste from others’ code. At a high level, I think the above are the only steps required.

[OneCricketeer]

So, to summarize this, I got

1. Use a base image that makes sense
2. Feel free to script in extra tasks using Gradle/Maven, as see fit.

we did have an internal discussion around whether we would support accepting a ZIP or TAR as part of “extraDirectories”, and in that sense, it might make sense to specify a remote ZIP URL

Well, that would be similar to the ADD semantics in Dockerfile. Might be useful ¯\_(ツ)_/¯.

[chanseokoh]

Okay, I think we can close this issue, for the purpose of tracking open issues. Feel free to reopen if you have questions.