![]() Additionally, the upstream community of Docker and Moby were often hostile to the use of systemd in a container. ![]() So, if you are going to manage your containers via Orchestrator like these, then you should think twice about using systemd-based containers. The main one is that systemd/journald controls the output of containers, whereas tools like Kubernetes and OpenShift expect the containers to log directly to stdout and stderr. That being said, there are also lots of reasons not to run systemd in containers. Systemd is a process manager-It handles the management of services like reaping, restarting, and shutting down better than any other tool.It can be better to launch the service via the supported method, rather than to hack up your own init service. These applications have a unit file that was written for the application and understands how to run the application. Systemd unit files-Most applications that run inside of containers are built from code that was run in VMs or on host systems.So running them as services launched out of unit files by systemd makes sense. We would prefer that they break apart these applications into microservices, but some people can’t or don’t have time yet. Multiservice containers-Lots of people want to take existing multi-service applications out of VMs and run them inside of containers.There are lots of reasons to run systemd inside a system, such as: In this article, I'll look at the progress that's been made and how Podman can help. In that article, I stated, “Sadly, two years later if you google Docker systemd, this is still the article people see-it’s time for an update.” I also linked to a talk about how upstream Docker and upstream systemd would not compromise. Way back in 2014, I wrote “ Running systemd within a Docker Container.” And, a couple of years later, I wrote another article, “ Running systemd in a non-privileged container,” explaining how things hadn’t gotten much better. I have been talking about systemd in a container for a long time.
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