Add docs about airgap + upgrades

Signed-off-by: manuelbuil <[email protected]>

docs/install/airgap.md

@@ -88,3 +88,29 @@ curl -sfL https://get.rke2.io --output install.sh
 INSTALL_RKE2_ARTIFACT_PATH=/root/rke2-artifacts sh install.sh
 ```
 3. Enable and run the service as outlined [here.](quickstart.md#2-enable-the-rke2-server-service)
+
+
+## Upgrading
+
+### Manual Upgrade Method
+
+Upgrading an air-gap environment can be accomplished in the following manner:
+
+1. Download the new air-gap images (tar files) from the [releases](https://github.com/rancher/rke2/releases) page for the version of RKE2 you will be upgrading to. Place the tar in the `/var/lib/rancher/rke2/agent/images/` directory on each node. Delete the old tar files.
+2. Follow the steps of the [manual upgrade method](../upgrades/manual-upgrade.md#manually-upgrade-rke2-using-the-binary)
+
+
+### Automated Upgrades Method
+
+RKE2 supports [automated upgrades](../upgrades/automated_upgrade.md). To enable this in air-gapped environments, you must ensure the required images are available in your private registry.
+
+You will need the version of rancher/rke2-upgrade that corresponds to the version of RKE2 you intend to upgrade to. Note, the image tag replaces the `+` in the RKE2 release with a `-` because Docker images do not support `+`.
+
+You will also need the versions of system-upgrade-controller and kubectl that are specified in the system-upgrade-controller manifest YAML that you will deploy. Check for the latest release of the system-upgrade-controller [here](https://github.com/rancher/system-upgrade-controller/releases/latest) and download the system-upgrade-controller.yaml to determine the versions you need to push to your private registry. For example, in release v0.4.0 of the system-upgrade-controller, these images are specified in the manifest YAML:
+
+```
+rancher/system-upgrade-controller:v0.4.0
+rancher/kubectl:v0.17.0
+```
+
+Once you have added the necessary rancher/rke2-upgrade, rancher/system-upgrade-controller, and rancher/kubectl images to your private registry, follow the [automated upgrades](../upgrades/automated.md) guide.

docs/upgrade/manual_upgrade.md

@@ -65,8 +65,8 @@ Or to manually upgrade rke2:
 
 1. Download the desired version of the rke2 binary from [releases](https://github.com/rancher/rke2/releases)
 2. Copy the downloaded binary to `/usr/local/bin/rke2` for tarball installed rke2, and `/usr/bin` for rpm installed rke2
-3. Stop the old rke2 binary
-4. Launch the new rke2 binary
+3. Stop the old rke2 process
+4. Launch the new rke2 process
 
 ### Upgrade rke2 Using the RPM upgrades