62 lines
1.8 KiB
Markdown
62 lines
1.8 KiB
Markdown
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# VPN
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Kilo enables peers outside of a Kubernetes cluster to connect to the created WireGuard network.
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This enables several use cases, for example:
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* giving cluster applications secure access to external services, e.g. services behind a corporate VPN;
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* allowing external services to access the cluster; and
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* enabling developers and support to securely debug cluster resources.
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In order to declare a peer, start by defining a Kilo Peer resource.
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See the following `peer.yaml`, where the `publicKey` field holds a [generated WireGuard public key](https://www.wireguard.com/quickstart/#key-generation):
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```yaml
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apiVersion: kilo.squat.ai/v1alpha1
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kind: Peer
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metadata:
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name: squat
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spec:
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allowedIPs:
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- 10.4.1.1/32
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publicKey: GY5aT1N9dTR/nJnT1N2f4ClZWVj0jOAld0r8ysWLyjg=
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persistentKeepalive: 10
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```
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Then, apply the resource to the cluster:
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```shell
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kubectl apply -f peer.yaml
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```
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Now, the `kgctl` tool can be used to generate the WireGuard configuration for the newly defined peer:
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```shell
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PEER=squat
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kgctl --kubeconfig=$KUBECONFIG showconf peer $PEER
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```
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This will produce some output like:
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```ini
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[Peer]
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PublicKey = 2/xU029dz/WtvMZAbnSzmhicl8U1/Y3NYmunRr8EJ0Q=
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AllowedIPs = 10.4.0.2/32, 10.2.3.0/24, 10.1.0.3/32
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Endpoint = 108.61.142.123:51820
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```
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The configuration can then be applied to a local WireGuard interface, e.g. `wg0`:
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```shell
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IFACE=wg0
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kgctl --kubeconfig=$KUBECONFIG showconf peer $PEER > peer.ini
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sudo wg setconf $IFACE peer.ini
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```
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Finally, in order to access the cluster, the client will need appropriate routes for the new configuration.
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For example, on a Linux machine, the creation of these routes could be automated by running:
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```shell
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for ip in $(kgctl --kubeconfig=$KUBECONFIG showconf peer $PEER | grep AllowedIPs | cut -f 3- -d ' ' | tr -d ','); do
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sudo ip route add $ip dev $IFACE
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done
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```
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