This architecture integrates better into modern Linux systems. Podman implements a more traditional architecture by forking processes, such that each container is a descendant process of Podman. A core problem is the server-client architecture of Docker: It's practically impossible to track container processes, and pull-requests to improve the situation have been rejected. Attempts to support such scenarios with Docker have failed. Systemd needs to know which processes are part of a service so it can manage them, track their health, and properly handle dependencies. One of the most common questions from users is: "How do I run a container within a systemd unit file?"Users are looking for the best practices. In fact, some applications are now exclusively delivered as containers, further increasing the demand. Users want to use systemd to install, run, and manage their applications using the new paradigm of containerization. For many years, there has been a growing demand for containerized systemd services.
The second use case is running Podman inside of systemd services. By using Podman, there is no difference anymore: "Containers are Linux," right? A huge step forward!
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Before the ability to use systemd in containers, vendors and users were forced to manually work around their standards to distribute and install packages in containers. Many packages require systemd to run the service and properly manage its dependencies. Running systemd inside Podman containers has been possible for many years, making the lives of users and vendors much easier. You can also use the -systemd=always flag on the command line. Podman does this automatically if the entry point of the container is either /usr/sbin/init or /usr/sbin/systemd.
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For instance, tmpfs mounts on /run, /run/lock, /tmp, and /var/log/journald, plus there is some configuration of /sys/fs/cgroup (depending on whether the system is in cgroup V1 or V2 mode). Running systemd in a container requires Podman to set up certain mounts required by systemd. Let's look at both use cases.įirst, we want Podman to run systemd inside a container. We approach seamless integration with systemd in two ways: Podman running systemd inside a container, and running Podman inside of systemd services. Early on, we realized that a seamless integration of Podman and systemd is important to our users. A core component of modern Linux systems is systemd, which is the de-facto standard for managing services and their dependencies. Staying true to the "containers are Linux" philosophy, we make containerization as easy as possible. Podman is known for its tight and seamless integration into Linux systems. Linux System Administration Skills Assessment.
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