[Doc] Added script to join worker nodes. Elaborated control plane init script and cni installation.

Signed-off-by: insukim1994 <insu.kim@moreh.io>

Author: insukim1994

utils/create-kubernetes-controlplane-node.sh renamed to utils/init-kubernetes-controlplane-node.sh

@@ -34,3 +34,7 @@ sudo kubeadm init --cri-socket=unix:///var/run/crio/crio.sock
 # kubeadm join <YOUR_CONTROL_PLANE_NODE_IP> --token <YOUR_GENERATED_TOKEN> \
 #         --discovery-token-ca-cert-hash <YOUR_GENERATED_CA_CERT_HASH>
 # --------------------------------------------------------------------------------
+
+# Make sure to save the following command from your output:
+# sudo kubeadm join <YOUR_CONTROL_PLANE_NODE_IP> --token <YOUR_GENERATED_TOKEN> \
+#         --discovery-token-ca-cert-hash <YOUR_GENERATED_CA_CERT_HASH> --cri-socket=unix:///var/run/crio/crio.sock

utils/install-cri-o.sh

@@ -1,6 +1,8 @@
 #!/bin/bash
 
 # Refer to https://github.com/cri-o/packaging/blob/main/README.md#distributions-using-deb-packages
+# and
+# https://github.com/cri-o/cri-o/blob/main/contrib/cni/README.md#configuration-directory
 # for more information.
 
 # Install the dependencies for adding repositories
@@ -22,3 +24,7 @@ sudo apt-get install -y cri-o
 
 # Start CRI-O
 sudo systemctl start crio.service
+
+# Install CNI (container network interface) plugins
+wget https://raw.githubusercontent.com/cri-o/cri-o/refs/heads/main/contrib/cni/10-crio-bridge.conflist
+sudo cp 10-crio-bridge.conflist /etc/cni/net.d

utils/join-kubernetes-worker-node.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# You got following output from previous control node initialization:
+
+# --------------------------------------------------------------------------------
+# Your Kubernetes control-plane has initialized successfully!
+#
+# ...
+#
+# Then you can join any number of worker nodes by running the following on each as root:
+#
+# kubeadm join <YOUR_CONTROL_PLANE_NODE_IP> --token <YOUR_GENERATED_TOKEN> \
+#         --discovery-token-ca-cert-hash sha256:<YOUR_GENERATED_CA_CERT_HASH>
+# --------------------------------------------------------------------------------
+
+# Make sure to execute the following command on your worker node:
+sudo kubeadm join <YOUR_CONTROL_PLANE_NODE_IP> --token <YOUR_GENERATED_TOKEN> \
+         --discovery-token-ca-cert-hash sha256:<YOUR_GENERATED_CA_CERT_HASH> --cri-socket=unix:///var/run/crio/crio.sock
+
+# If you lost above information, you can get the token and hash by running following command on your CONTROL PLANE node:
+# To get <YOUR_CONTROL_PLANE_NODE_IP>
+kubectl get nodes -o wide | grep -i control-plane | awk '{printf $6}'
+
+# To get <YOUR_GENERATED_TOKEN>
+sudo kubeadm token create
+
+# To get <YOUR_GENERATED_CA_CERT_HASH>
+openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | \
+openssl rsa -pubin -outform der 2>/dev/null | \
+sha256sum | awk '{print $1}'