Create ROCKY_RHEL-kubeadm_reset.sh

Author: grogcw

ROCKY_RHEL-kubeadm_reset.sh

@@ -0,0 +1,122 @@
+#!/bin/bash
+
+# Flag variable to track valid input
+valid_input=false
+
+# Loop until valid input is received
+while [ "$valid_input" = false ]; do
+    # Prompt the user to continue or stop
+    echo "This script requires to be run as root and will erase and reconstruct a base cluster."
+    read -p "Do you wish to continue ? (Yes/No) [Yes]: "
+
+    # Convert user input to lowercase for case-insensitive comparison
+    user_input_lower=$(printf "%s" "$REPLY" | tr '[:upper:]' '[:lower:]')
+
+    # Check user input and take action accordingly
+    case $user_input_lower in
+        "" | "y" | "yes")
+            valid_input=true
+            ;;
+        "n" | "no")
+            echo "Stopping."
+            exit 0
+            ;;
+        *)
+            echo "Invalid input."
+            ;;
+    esac
+done
+
+kubeadm reset -f
+systemctl stop containerd
+systemctl stop docker.socket
+systemctl stop docker.service
+systemctl stop $(systemctl list-units --all | awk '/kube/ {print $1}')
+systemctl stop kubelet
+dnf remove -y containerd.io docker-ce kubelet kubeadm kubectl
+rm -rf /etc/containerd
+rm -rf /etc/cni
+rm -rf /etc/kubernetes
+rm -rf /etc/docker
+rm -rf /var/lib/kubelet
+rm -rf /var/lib/cni
+rm -rf /var/lib/containerd
+rm -rf /var/lib/calico
+rm -rf /data
+ip link delete docker0
+ipvsadm --clear
+iptables -P INPUT ACCEPT
+iptables -P OUTPUT ACCEPT
+iptables -P FORWARD ACCEPT
+iptables -F
+iptables -X
+iptables -t nat -F
+iptables -t nat -X
+iptables -t mangle -F
+iptables -t mangle -X
+dnf makecache
+dnf install -y containerd.io docker-ce kubelet kubeadm kubectl --disableexcludes=kubernetes
+mv /etc/containerd/config.toml /etc/containerd/config.toml.orig
+containerd config default > /etc/containerd/config.toml
+sudo sed -i 's/^            SystemdCgroup = false/            SystemdCgroup = true/' /etc/containerd/config.toml
+systemctl enable --now containerd.service
+systemctl enable --now kubelet.service
+systemctl start kubelet
+kubeadm config images pull
+kubeadm init
+export KUBECONFIG=/etc/kubernetes/admin.conf
+mkdir -p $HOME/.kube
+sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
+sudo chown $(id -u):$(id -g) $HOME/.kube/config
+echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> /etc/profile.d/k8s.sh
+kubectl apply -f https://raw.githubusercontent.com/projectcalico/calico/v3.25.0/manifests/calico.yaml
+
+# Taint node for later use
+kubectl taint nodes --all node-role.kubernetes.io/control-plane-
+
+# Create StorageClass, PersistentVolume and tag it as default
+cat > /root/sc.yaml << EOF
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: local-storage
+provisioner: kubernetes.io/no-provisioner
+volumeBindingMode: WaitForFirstConsumer
+EOF
+
+cat > /root/pv.yaml << EOF
+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  annotations: {}
+  name: storage-pv
+spec:
+  accessModes:
+    - ReadWriteOnce
+  capacity:
+    storage: 10Gi
+  local:
+    path: /data
+  nodeAffinity:
+    required:
+      nodeSelectorTerms:
+        - matchExpressions:
+            - key: kubernetes.io/hostname
+              operator: In
+              values:
+                - kubernetes
+  persistentVolumeReclaimPolicy: Retain
+  storageClassName: local-storage
+  volumeMode: Filesystem
+EOF
+
+mkdir /data
+
+kubectl apply -f /root/sc.yaml
+kubectl apply -f /root/pv.yaml
+kubectl patch storageclass local-storage -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
+
+# Add portainer's repo and install it.
+helm repo add portainer https://portainer.github.io/k8s/
+helm repo update
+helm upgrade --install --create-namespace -n portainer portainer portainer/portainer