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Update README for airgap documentation

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Erik Wilson 2019-03-29 16:39:09 -07:00
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@ -397,6 +397,26 @@ for port 80. If no port is available the load balancer will stay in Pending.
To disable the embedded service load balancer (if you wish to use a different implementation like
MetalLB) just add `--no-deploy=servicelb` to the server on startup.
Air-Gap Support
---------------
k3s supports pre-loading of containerd images by placing them in the `images` directory for the agent before starting, eg:
```sh
sudo mkdir -p /var/lib/rancher/k3s/agent/images/
sudo cp ./k3s-airgap-images-$ARCH.tar /var/lib/rancher/k3s/agent/images/
```
Images needed for a base install are provided through the releases page, additional images can be created with the `docker save` command.
Offline Helm charts are served from the `/var/lib/rancher/k3s/server/static` directory, and Helm chart manifests may reference the static files with a `%{KUBERNETES_API}%` templated variable. For example, the default traefik manifest chart installs from `https://%{KUBERNETES_API}%/static/charts/traefik-X.Y.Z.tgz`.
If networking is completely disabled k3s may not be able to start (ie ethernet unplugged or wifi disconnected), in which case it may be necessary to add a default route. For example:
```sh
sudo ip -c address add 192.168.123.123/24 dev eno1
sudo ip route add default via 192.168.123.1
```
k3s additionally provides a `--resolv-conf` flag for kubelets, which may help with configuring DNS in air-gap networks.
TODO
----
Currently broken or stuff that needs to be done for this to be considered production quality.