Kubeadm kubernetes cluster Ubuntu 24.04 - Revision history

Busk at 06:07, 4 January 2025

2025-01-04T06:07:21Z

2025-01-04T05:36:38Z

2025-01-04T05:23:31Z

2025-01-04T05:14:59Z

2024-12-27T19:59:33Z

2024-12-27T19:36:03Z

2024-12-27T19:16:06Z

2024-12-27T19:05:36Z

2024-12-27T19:04:33Z

2024-12-27T19:00:01Z

@@ Line 34: / Line 34: @@
    lsmod | grep br_netfilter
    cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
 net.bridge.bridge-nf-call-iptables  = 1

@@ Line 15: / Line 15: @@
    sudo mkdir -p /etc/containerd
    containerd config default | sudo tee /etc/containerd/config.toml > /dev/null
    sudo sed -i 's/SystemdCgroup = false/SystemdCgroup = true/' /etc/containerd/config.toml
    sudo systemctl restart containerd

← Older revision		Revision as of 05:23, 4 January 2025
Line 102:		Line 102:
	update_kubeadm_version		update_kubeadm_version

		+	```
		+
		+	## Remove node taints
		+	```
		+	kubectl taint nodes --all node-role.kubernetes.io/control-plane-
		+	kubectl taint nodes --all node.cilium.io/agent-not-ready-
	```		```

@@ Line 29: / Line 29: @@
    sudo modprobe overlay
    sudo modprobe br_netfilter
-   echo -e "br_netfilter\noverlay" | sudo tee /etc/modules-load.d/kubernetes-cni.conf
+   echo -e "br_netfilter\noverlay" | sudo tee /etc/modules-load.d/k8s.conf
    lsmod | grep overlay
    lsmod | grep br_netfilter

@@ Line 52: / Line 52: @@
 sudo kubeadm init --v=5
 ```
 ## Upgrade node Kubernetes version
@@ Line 82: / Line 103: @@
 ```
 ## Upgrade primary controller
@@ Line 92: / Line 114: @@
    kubeadm upgrade apply -y ${k8s_patch_version}
 ```
 ## Get Worker Join Command - token expires 24h default
@@ Line 97: / Line 120: @@
 sudo kubeadm token create --print-join-command --ttl 1h
 ```
 ## Get Controller Join Command (must be ran from existing controller. token expires 2h default)
@@ Line 103: / Line 127: @@
 ```
-## Install Cilium on init Controller
+# Drain node
 ```
-set -eu
+#!/bin/bash
-install_cilium(){
+set -eux
-   export KUBECONFIG=/etc/kubernetes/admin.conf
+# Function to check if all pods are drained from the node
-   cilium install --version 1.16.5
+function is_drained() {
-   cilium status --wait
+   local node_name="$1"
+}
-install_cilium
 ```

@@ Line 1: / Line 1: @@
 # Kubeadm Cluster Scripts
-## Init
+## Prep k8s node
 ```
 #!/bin/bash
@@ Line 8: / Line 8: @@
 k8s_minor_version=1.31
-kubeadm_init(){
+prep_k8s_node(){
    sudo apt update && sudo apt upgrade -y
    sudo apt install apt-transport-https curl -y
@@ Line 44: / Line 44: @@
+}
-kubeadm_init
+prep_k8s_node
 ```
@@ Line 95: / Line 101: @@
 ```
 sudo kubeadm token create --print-join-command --certificate-key $(sudo kubeadm init phase upload-certs --upload-certs | sed -n '3p')
 ```

@@ Line 39: / Line 39: @@
 EOF
-   sysctl --system
+   sudo sysctl --system
    echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bashrc
-   reboot
+   sudo reboot
+}

@@ Line 85: / Line 85: @@
    sleep 20 # wait a little bit to permit completing in-flight requests
    kubeadm upgrade apply -y ${k8s_patch_version}
 ```

@@ Line 19: / Line 19: @@
    curl -fsSL https://pkgs.k8s.io/core:/stable:/v${k8s_minor_version}/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
-   echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v${k8s_minor_version}/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
+   echo "deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v${k8s_minor_version}/deb/ /" | sudo tee /etc/apt/sources.list.d/kubernetes.list
    sudo apt update
    sudo apt install -y kubelet kubeadm kubectl