红帽全球峰会第 11 章 Managing RHEL bootc images
After installing and deploying RHEL bootc images, you can perform management operations on your container images, such as changing or updating the systems. The system supports in-place transactional updates with rollback after deployment.
This kind of management, also known as Day 2 management baseline, consists of transactionally fetching new operating system updates from a container registry and booting the system into them, while supporting manual, or automated rollbacks in case of failures.
See Day 2 operations support for more details.
The rhel-bootc images are rebuilt whenever their underlying inputs, such as RPM packages, are updated. These rebuilds occur at least monthly, or more frequently if critical updates are released. As a user, you maintain full control over when to push the update images. A newly published base image does not trigger automatic rebuilds or redeployments of your custom images. You configure the update cadence and only push changes as required.
图 11.1. Manually updating an installed operating system, changing the container image reference or rolling back changes if needed
11.1. Switching the container image reference
You can change the container image reference used for upgrades by using the bootc switch command. For example, you can switch from the stage to the production tag. To manually switch an existing ostree-based container image reference, use the bootc switch command.
Prerequisites
-
A booted system using
bootc.
Procedure
Run the following command:
$ sudo bootc switch [--apply] quay.io/<namespace>/<image>:<tag>Optionally, you can use the
--applyoption when you want to automatically take actions, such as rebooting if the system has changed.
The bootc switch command has the same effect as bootc upgrade. The only difference is the container image reference is changed. This allows preserving the existing states in /etc and /var, for example, host SSH keys and home directories.
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