typhoon/docs/addons/cluo.md

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# Container Linux Update Operator
The [Container Linux Update Operator](https://github.com/coreos/container-linux-update-operator) (i.e. CLUO) coordinates reboots of auto-updating Container Linux nodes so that one node reboots at a time and nodes are drained before reboot. CLUO enables the auto-update behavior Container Linux clusters are known for, but does so in a Kubernetes native way.
## Create
Create the `update-operator` deployment and `update-agent` DaemonSet.
```sh
kubectl apply -f addons/cluo -R
```
## Usage
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`update-agent` runs as a DaemonSet and annotates a node when `update-engine.service` indicates an update has been installed and a reboot is needed. It also adds additional labels and annotations to nodes.
```
$ kubectl get nodes --show-labels
...
container-linux-update.v1.coreos.com/group=stable
container-linux-update.v1.coreos.com/version=1465.6.0
```
`update-operator` ensures one node reboots at a time and that pods are drained prior to reboot.
!!! note ""
CLUO replaces `locksmithd` reboot coordination. The `update_engine` systemd unit on hosts still performs the Container Linux update check, download, and install to the inactive partition.