What's the best way to run a script after the container has come up?

[aaomidi]

I'm using docker-compose, and I'm looking for a way to say "run this script after the container has come up". I don't think I can override the entrypoint since I need systemd to be there.

Apologies if this has already been documented, I wasn't able to spot it.

[ctalledo]

Hi @aaomidi, if the Sysbox container has systemd in it, then the natural way to automatically run a program inside is to create a systemd service for it (just as you would on a bare-metal machine or VM).

For example, you could create a Dockerfile that uses nestybox/ubuntu-focal-systemd as a base image, and then copy into it a systemd unit / service that automatically starts the program you want. Refer to the systemd docs for details on how to do this.

[ctalledo]

By the way, in some cases having systemd inside the Sysbox container may be warranted, in others it may be a bit too heavy. There are lighter weigh alternatives such as supervisord that are a bit easier to configure, though less versatile than systemd. There is a sample Dockerfile for a Sysbox container with supervisord here.