Automatic Linux Worker MKE Node Cleanup Script

auto_interactive_mke_linux_worker_cleanup.sh

#!/bin/bash
# ===============================================
# Created by: Richard Barrett
# Date Created: 02/27/2020
# Purpose: Auto Interactive Worker Node Cleanup
# Company: Mirantis
# ===============================================

# Documentation:
# ============================================================================================================================================
# https://mirantis.my.salesforce.com/articles/How_To/How-to-Clean-Up-A-Docker-Enterprise-MKE-Linux-Worker-Node?popup=false&id=kA32S000000PfQF
# ============================================================================================================================================
#set -e

# keep track of the last executed command
trap 'last_command=$current_command; current_command=$BASH_COMMAND' DEBUG

# echo an error message before exiting
trap 'echo "\"${last_command}\" command filed with exit code $?."' EXIT

# System Variables
# ================
DATE="$(date +'%Y%-m%d')"
VAR_LIB_DOCKER="/var/lib/docker"
RUN_DOCKER="/run/docker"
ETC_CNI="/etc/cni"
ETC_CONTAINERD="/etc/containerd"
OPT_CNI="/opt/cni"
OPT_CONTAINERD="/opt/containerd"
VAR_LIB_CONTAINERD="/var/lib/containerd"
VAR_LIB_KUBELET="/var/lib/kubelet"
VAR_LIB_DOCKERENGINE="/var/lib/docker-engine"
VAR_LOG_CONTAINERS="/var/log/containers"
LIST_VAR_LIB_KUBELET=$(ls -d "/var/lib/kubelet/"*.*)

while true; do
    read -p "Do you want to proceed with the clean up of this worker node (yes/no)?" yn
    case $yn in
        [Yy]* ) echo "============================================================================"; \
                echo "                         Cleaning up Worker Node..."; \
                echo "============================================================================"; \
                # Clean up worker node
                echo "Leaving Swarm...";
                docker swarm leave --force;
                echo "Stopping All Docker Containers...";
                docker stop $(docker ps -aq);
                echo "Removing All Docker Components...";
                docker rm $(docker ps -aq);
                docker volume rm $(docker volume ls);
                docker service rm $(docker service ls -q);
                echo "Perform Docker System Prune...";
                docker system prune -af;
                echo "Stopping Docker and Containerd...";
                systemctl stop docker;
                systemctl stop containerd;
                echo "Removing Docker Filesystem...";
                # Remove Docker File System and Docker Mounts
                rm -rf $VAR_LIB_DOCKER
                echo "Unmounting /run/docker/netns/default...";
                umount -f $RUN_DOCKER/netns/default
                rm -rf $RUN_DOCKER
                rm -rf $ETC_CNI
                rm -rf $ETC_CONTAINERD
                rm -rf $OPT_CNI
                rm -rf $OPT_CONTAINERD
                rm -rf $VAR_LIB_CONTAINERD
                echo "Unmounting All Kubelet Pods Running As Containers...";
                for i in $($LIST_VAR_LIB_KUBELET); \
                    do unmount -f $i; \
                done;
                rm -rf $VAR_LIB_KUBELET
                rm -rf $VAR_LIB_DOCKERENGINE
                rm -rf $VAR_LOG_CONTAINERS
                echo "Filesystem has been deleted, you do not need to reboot...";
                echo "Starting Docker Daemon...";
                systemctl start docker;
                echo "============================================================================"; \
                echo "        Worker Node Has Been Cleaned, Proceed to Rejoin Cluster..."; \
                echo "============================================================================"; \
               break;; \
        [Nn]* ) exit;;
        * ) echo "Please answer yes or no.";;
    esac
done

while true; do
    read -p "Is this cluster airgapped (no/yes)?" ny
    case $ny in
        [Nn]* ) echo "================================================"; \
                echo "             Pull Missing Images"; \ 
                echo "================================================"; \
                echo "Pulling Missing Images..."
                docker container run --rm -it \
                    --name ucp \
                    -v /var/run/docker.sock:/var/run/docker.sock mirantis/ucp \
                    images --pull missing;
                echo "Missing Images Have Been Pulled..."
                break;; \
        [Yy]* ) exit;;
        * ) echo "Please answer yes or no.";;
    esac
done