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diff --git a/docs/source/markdown/podman-auto-update.1.md b/docs/source/markdown/podman-auto-update.1.md new file mode 100644 index 000000000..93ad22f76 --- /dev/null +++ b/docs/source/markdown/podman-auto-update.1.md @@ -0,0 +1,46 @@ +% podman-auto-update(1) + +## NAME +podman-auto-update - Auto update containers according to their auto-update policy + +## SYNOPSIS +**podman auto-update** + +## DESCRIPTION +`podman auto-update` looks up containers with a specified "io.containers.autoupdate" label (i.e., the auto-update policy). + +If the label is present and set to "image", Podman reaches out to the corresponding registry to check if the image has been updated. +An image is considered updated if the digest in the local storage is different than the one of the remote image. +If an image must be updated, Podman pulls it down and restarts the systemd unit executing the container. + +At container-creation time, Podman looks up the "PODMAN_SYSTEMD_UNIT" environment variables and stores it verbatim in the container's label. +This variable is now set by all systemd units generated by `podman-generate-systemd` and is set to `%n` (i.e., the name of systemd unit starting the container). +This data is then being used in the auto-update sequence to instruct systemd (via DBUS) to restart the unit and hence to restart the container. + +Note that `podman auto-update` relies on systemd and requires a fully-qualified image reference (e.g., quay.io/podman/stable:latest) to be used to create the container. +This enforcement is necessary to know which image to actually check and pull. +If an image ID was used, Podman would not know which image to check/pull anymore. + +## EXAMPLES + +``` +# Start a container +$ podman run -d busybox:latest top +bc219740a210455fa27deacc96d50a9e20516492f1417507c13ce1533dbdcd9d + +# Generate a systemd unit for this container +$ podman generate systemd --new --files bc219740a210455fa27deacc96d50a9e20516492f1417507c13ce1533dbdcd9d +/home/user/containers/libpod/container-bc219740a210455fa27deacc96d50a9e20516492f1417507c13ce1533dbdcd9d.service + +# Load the new systemd unit and start it +$ mv ./container-bc219740a210455fa27deacc96d50a9e20516492f1417507c13ce1533dbdcd9d.service ~/.config/systemd/user +$ systemctl --user daemon-reload +$ systemctl --user start container-bc219740a210455fa27deacc96d50a9e20516492f1417507c13ce1533dbdcd9d.service + +# Auto-update the container +$ podman auto-update +container-bc219740a210455fa27deacc96d50a9e20516492f1417507c13ce1533dbdcd9d.service +``` + +## SEE ALSO +podman(1), podman-generate-systemd(1), podman-run(1), systemd.unit(5) |