bootc-base-images/docs/usage.md

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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