[FEATURE REQUEST] Running container in foreground

[hron84]

Currently, poco up plan always start containers behind the scenes. In some cases it would be more useful, if the container could be started in foreground, like how the docker-compose up works.

[sarkiroka]

@hron84
Could you give one or more specific example(s) of where this would be useful?

[hron84]

I currently have a Git repository with Nagios configuration files and I use docker-compose to create a Nagios container with same version as the production and check the configuration files (I don't want to actually run a Nagios server, since it's not neccessary and could not work because a whole different networking conditions. I just want to check configuration files from syntax, and dependency aspect).

The docker-compose.yml:

version: "3.7"

services:
  nagios:
    image: jasonrivers/nagios:latest
    volumes:
      - .:/opt/nagios/etc/
    command: /opt/nagios/bin/nagios -v /opt/nagios/etc/nagios.cfg

After starting the tests, Nagios runs a few checks and exits. If the Nagios encounter any problems it logs to the standard output/standard error streams. But since I cannot see immediately the output of the output of the container, I lose the information about why the tests are failed. Running poco log after starting not helps, these tests are very quick and the container become stopped right after that, poco log mosty displays nothing/errors from this.

I know there is a workaround for this problem but since docker-compose itself already supports running multiple containers in the foreground I just can't see why PoCo cannot do the same.

[sarkiroka]

Ah, I see. But you know, the docker holds the log after the container exited too. When you have an exited (or running) container, you can get the previous logs by docker logs your_container command.
And if you use -f option for logs (follow log output) then log printed continously, except if container exited. This case -f option give back the prompt immediately.

So, you can use this command to check your nagios configuration:
poco up && docker logs your_container -f