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There is some overlap with `install.md`, but that doc is all about how to just get started. This doc aims to cover things that are somewhat different about the base image we ship here versus just what one might get from installing the same RPM packages. The automatic updates being on by default is a big one. Signed-off-by: Colin Walters <walters@verbum.org>
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Operating system content and usage
Automatic updates enabled by default
The base image here enables the bootc-fetch-apply-updates.service systemd unit which automatically finds updated container images from the registry and will reboot into them.
Controlling automatic updates
First, one can disable the timer entirely as part of a container build:
RUN systemctl mask bootc-fetch-apply-updates.timer
Alternatively, one can use systemd "drop-ins" to override the timer
(for example, to schedule updates for once a week), create a file
like this, named e.g. 50-weekly.conf:
[Timer]
# Clear previous timers
OnBootSec= OnBootSec=1w OnUnitInactiveSec=1w
Then add it into your container:
RUN mkdir -p /usr/lib/systemd/system/bootc-fetch-apply-updates.timer.d
COPY 50-weekly.conf /usr/lib/systemd/system/bootc-fetch-apply-updates.timer.d