Cockpit 225 and Cockpit Podman 21
Cockpit is the modern Linux admin interface. We release regularly. Here are the release notes from Cockpit version 223 and Cockpit Podman version 21.
Machines: Add support for VM snapshots
Cockpit now supports libvirt’s qcow2-based “internal” snapshotting.
When a virtual machine is not running and Cockpit makes a snapshot, only the disk contents will be saved. When a virtual machine is running, Cockpit will snapshot both the disk and memory state.
Developer API: Launch and reattach to a long-running process
Pages in Cockpit should never tie long-running processes to the browser’s session, as the page could reload at any time, the browser tab could be closed, or the computer running the browser could be shut down. These long-running sessions, such as software installers and Ansible playbooks, should persist across Cockpit sessions.
To anyone creating a Cockpit page, please review the new long-running process example to ensure your page is more robust. The example demonstrates how a to handle detached sessions by running a process in a transient systemd unit and having the page attach (and re-attach, when the session changes) to the running process. Using this method allows for session interruptions.
All of this logic is implemented in a JavaScript module which we encourage you to copy into your own project.
Podman: Support for pod groups
Initial support for pod groups in Cockpit has landed! The cockpit-podman plugin can now list pods (a group of containers) alongside the rest of the containers on a system. Basic actions like starting and pausing pods is also supported.
Podman: Support checkpoint and restore
“Checkpointing” stops a container and writes the state of all container processes to disk. A container can later be resumed from a checkpoint in the exact state from when the checkpoint was made.
This checkpointing capability requires CRIU 3.11 or later installed. Currently, only the runc container runtime is supported and also is only available with cgroupv1 systems.
Thanks to Tomáš Glozar for this contribution!
Podman: Registry selection in “download image” dialog
When downloading images, a specific registry source can be selected.
Podman: Selected tag removal during deletion
Deleting images now shows a confirmation dialog where just specific tags can be selected for removal.
Try it out
Cockpit 225 and Cockpit-podman 21 are available now: