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75ce47347c
Rewrite the auto-update man page. It was quite dusty and out-dated as it was not mentioning Quadlet at all. At times it was too verbose about internal implementation details that users shouldn't need to worry about. Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>
123 lines
6.2 KiB
Markdown
123 lines
6.2 KiB
Markdown
% podman-auto-update 1
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## NAME
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podman\-auto-update - Auto update containers according to their auto-update policy
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## SYNOPSIS
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**podman auto-update** [*options*]
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## DESCRIPTION
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**podman auto-update** pulls down new container images and restarts containers configured for auto updates.
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To make use of auto updates, the container or Kubernetes workloads must run inside a systemd unit.
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After a successful update of an image, the containers using the image get updated by restarting the systemd units they run in.
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Please refer to `quadlet(5)` on how to run Podman under systemd.
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To configure a container for auto updates, it must be created with the `io.containers.autoupdate` label or the `AutoUpdate` field in `quadlet(5)` with one of the following two values:
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* `registry`: If the label is present and set to `registry`, Podman reaches out to the corresponding registry to check if the image has been updated.
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The label `image` is an alternative to `registry` maintained for backwards compatibility.
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An image is considered updated if the digest in the local storage is different than the one of the remote image.
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If an image must be updated, Podman pulls it down and restarts the systemd unit executing the container.
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The registry policy requires a fully-qualified image reference (e.g., quay.io/podman/stable:latest) to be used to create the container.
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This enforcement is necessary to know which image to actually check and pull.
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If an image ID was used, Podman would not know which image to check/pull anymore.
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* `local`: If the autoupdate label is set to `local`, Podman compares the image digest of the container to the one in the local container storage.
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If they differ, the local image is considered to be newer and the systemd unit gets restarted.
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### Auto Updates and Kubernetes YAML
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Podman supports auto updates for Kubernetes workloads. The auto-update policy can be configured directly via `quadlet(5)` or inside the Kubernetes YAML with the Podman-specific annotations mentioned below:
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* `io.containers.autoupdate`: "registry|local" to apply the auto-update policy to all containers
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* `io.containers.autoupdate/$container`: "registry|local" to apply the auto-update policy to `$container` only
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* `io.containers.sdnotify`: "conmon|container" to apply the sdnotify policy to all containers
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* `io.containers.sdnotify/$container`: "conmon|container" to apply the sdnotify policy to `$container` only
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By default, the autoupdate policy is set to "disabled", the sdnotify policy is set to "conmon".
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### Systemd Unit and Timer
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Podman ships with a `podman-auto-update.service` systemd unit. This unit is triggered daily at midnight by the `podman-auto-update.timer` systemd timer.
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The timer can be altered for custom time-based updates if desired.
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The unit can further be invoked by other systemd units (e.g., via the dependency tree) or manually via **systemctl start podman-auto-update.service**.
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## OPTIONS
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@@option authfile
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Alternatively, the `io.containers.autoupdate.authfile` container label can be configured. In that case, Podman will use the specified label's value instead.
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#### **--dry-run**
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Check for the availability of new images but do not perform any pull operation or restart any service or container.
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The `UPDATED` field indicates the availability of a new image with "pending".
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#### **--format**=*format*
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Change the default output format. This can be of a supported type like 'json' or a Go template.
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Valid placeholders for the Go template are listed below:
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| **Placeholder** | **Description** |
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| --------------- | -------------------------------------- |
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| .Container | ID and name of the container |
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| .ContainerID | ID of the container |
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| .ContainerName | Name of the container |
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| .Image | Name of the image |
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| .Policy | Auto-update policy of the container |
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| .Unit | Name of the systemd unit |
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| .Updated | Update status: true,false,failed |
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#### **--rollback**
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If restarting a systemd unit after updating the image has failed, rollback to using the previous image and restart the unit another time. Default is true.
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Note that detecting if a systemd unit has failed is best done by the container sending the READY message via SDNOTIFY.
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This way, restarting the unit waits until having received the message or a timeout kicked in.
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Without that, restarting the systemd unit may succeed even if the container has failed shortly after.
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For a container to send the READY message via SDNOTIFY it must be created with the `--sdnotify=container` option (see podman-run(1)).
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The application running inside the container can then execute `systemd-notify --ready` when ready or use the sdnotify bindings of the specific programming language (e.g., sd_notify(3)).
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@@option tls-verify
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## EXAMPLES
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Create a Quadlet file configured for auto updates:
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```
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$ cat ~/.config/containers/systemd/sleep.container
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[Container]
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Image=registry.fedoraproject.org/fedora:latest
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Exec=sleep infinity
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AutoUpdate=registry
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```
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Generate a systemd service from the Quadlet file by reloading the systemd user daemon:
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```
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$ systemctl --user daemon-reload
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```
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Start the systemd service and make sure the container is running
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```
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$ systemctl --user start sleep.service
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$ podman ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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f8e4759798d4 registry.fedoraproject.org/fedora:latest sleep infinity 2 seconds ago Up 2 seconds systemd-sleep
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```
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Check if a new image is available via `--dry-run`:
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```
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$ podman auto-update --dry-run --format "{{.Image}} {{.Updated}}"
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registry.fedoraproject.org/fedora:latest pending
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```
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Update the service:
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```
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$ podman auto-update
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UNIT CONTAINER IMAGE POLICY UPDATED
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sleep.service f8e4759798d4 (systemd-sleep) registry.fedoraproject.org/fedora:latest registry true
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```
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## SEE ALSO
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**[podman(1)](podman.1.md)**, **[podman-generate-systemd(1)](podman-generate-systemd.1.md)**, **[podman-run(1)](podman-run.1.md)**, **[podman-systemd.unit(5)](podman-systemd.unit.5.md)**, **sd_notify(3)**, **[systemd.unit(5)](https://www.freedesktop.org/software/systemd/man/systemd.unit.html)**
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