Adding systemd based image - Githubissues

perfsonar / perfsonar-testpoint-docker

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Adding systemd based image #17

Closed DanielNeto closed 3 years ago

DanielNeto commented 3 years ago

Why to use systemd:

Does not require an additional file to start the services (supervisord.conf)
Start services the same way inside a container as it would outside the container
It's easier then supervisord to manage services' lifecycle (start/stop/restart)
It can run in a non-privileged container
It kills zombie processes
But mostly, it solves the problem we were having when the container restart without removing the PID files properly

What changed to do it:

The base image is still centos7 but a few extra commands are required to run systemd properly inside a docker container. Those commands were added to this new Dockerfile located inside the systemd folder.
When running this new container you have to mount /tmp and /run as tmpfs and /sys/fs/cgroup as read-only.

I also added a new docker-compose file (docker-compose.systemd.yml) to make the life easier of anyone who wants to build and run this version.

arlake228 commented 3 years ago

This looks great! Thanks Daniel, merging now. We should talk at next stand-up about when we want to release this.