Podman checkpoint/restore on btrfs

 Posted on February 20, 2021  |  5 minutes  |  1008 words  |  Attila Pinter - Adathor

Podman Checkpoint/Restore in Userspace

Recently I was migrating our entire Podman infra to a new, bigger server, roughly ~180 container. Most of our things are running in pods which are fairly easy to migrate, just podman generate kube --filename xyz.yml xyz-pod, clean up the yml a bit and on the new server I just play it with podman play xyz.yml. Done, pod migrated. On the other hand we have a few containers that are running outside of pods and was interested how lazy I can get with those using Podman. Fairly quickly ran into Podman Checkpoints/Restore in Userspace (CRIU). With CRIU Podman is able to checkpoint and restore containers in their current state. Migration is just one use-case, another would be to restore a container after a host reboot exactly the way it was prior the restart. This is exactly what I needed, scripts back in the box, in the new and shiny stuff comes.

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Podman  container  migration 

Podman quick start

 Posted on February 10, 2021  |  27 minutes  |  5747 words  |  Attila Pinter - Adathor

What is Podman

Podman is a a daemonless, open-source tool to manage, deploy and build application containers. Podman is using Open Containers Initiative (OCI) Containers and container images, which means that containers crated with/for Docker or CRI-o will work with Podman as well and vice versa. It is coming with a command line interface (CLI) which offers pretty much the same commands like Docker does. How similar are Podman commands to Docker’s? Let’s put it this way: many Podman users just alias docker to podman. Like other runtimes, Podman also relies on an OCI compliant container runtime to interface with the operating system. Podamn also has a RESTful API to manage containers, offers automatic updates of containers and has a fantastic systemd integration.

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Podman  container  automation