Added deployment guide

docs/infrastructure/kubernetes.md

@@ -13,4 +13,89 @@
 | ------------- | ----------- | ---------------------- | -------- |
 | k3s-worker-01 | 10.20.40.21 | AMD Ryzen 5 PRO 2400GE | 48       |
 | k3s-worker-02 | 10.20.40.22 | Intel i5 8600          | 16       |
-| k3s-worker-03 | 10.20.40.23 | Intel i5 8600          | 16       |
+| k3s-worker-03 | 10.20.40.23 | Intel i5 8600          | 16       |
+## Deployment guide
+My cluster is has 3 control planes, this makes it HA.
+### Shared VIP for the 3 control planes
+#### 1. Install keepalived
+```bash
+sudo apt install keepalived -y
+```
+#### 2. Create config file
+```bash
+sudo nano /etc/keepalived/keepalived.conf
+```
+For the first node, you want the `state` to be "MASTER", for every other node, you want the `state` to be "BACKUP", which decreasing priority for each node.
+##### k3s-cp-01
+```
+vrrp_instance VI_1 {
+    state MASTER
+    interface eth0
+    virtual_router_id 51
+    priority 100
+    advert_int 1
+    authentication {
+        auth_type PASS
+        auth_pass REPLACE_THIS_WITH_A_PASSWORD
+    }
+    virtual_ipaddress {
+        10.20.40.10/24
+    }
+}
+```
+##### k3s-cp-02
+```
+vrrp_instance VI_1 {
+    state BACKUP
+    interface eth0
+    virtual_router_id 51
+    priority 99
+    advert_int 1
+    authentication {
+        auth_type PASS
+        auth_pass REPLACE_THIS_WITH_A_PASSWORD
+    }
+    virtual_ipaddress {
+        10.20.40.10/24
+    }
+}
+```
+##### k3s-cp-02
+```
+vrrp_instance VI_1 {
+    state BACKUP
+    interface eth0
+    virtual_router_id 51
+    priority 98
+    advert_int 1
+    authentication {
+        auth_type PASS
+        auth_pass REPLACE_THIS_WITH_A_PASSWORD
+    }
+    virtual_ipaddress {
+        10.20.40.10/24
+    }
+}
+```
+#### 3. Start & enable the service
+```bash
+sudo systemctl enable --now keepalived
+```
+### Initialise the first control plane
+```bash
+curl -sfL https://get.k3s.io | K3S_TOKEN=REPLACE sh -s - server --cluster-init --tls-san=10.20.40.10 --disable=traefik --disable=servicelb
+```
+### Add the other two control planes
+```bash
+curl -sfL https://get.k3s.io | K3S_TOKEN=REPLACE sh -s - server --server https://10.20.40.10:6443 --tls-san=10.20.40.10 --disable=traefik --disable=servicelb
+```
+
+### Adding worker nodes
+#### 1. grab `K3S_TOKEN` from master
+```bash
+sudo cat /var/lib/rancher/k3s/server/node-token
+```
+#### 2. Add each worker node
+```
+curl -sfL https://get.k3s.io | K3S_URL=https://10.20.40.10:6443 K3S_TOKEN=REPLACE sh -
+```