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April 14, 2020 19:05
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| #!/bin/bash | |
| ######################################################################### | |
| # Copyright (C) 2019-2020 Akito <[email protected]> # | |
| # # | |
| # This program is free software: you can redistribute it and/or modify # | |
| # it under the terms of the GNU General Public License as published by # | |
| # the Free Software Foundation, either version 3 of the License, or # | |
| # (at your option) any later version. # | |
| # # | |
| # This program is distributed in the hope that it will be useful, # | |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
| # GNU General Public License for more details. # | |
| # # | |
| # You should have received a copy of the GNU General Public License # | |
| # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
| ######################################################################### | |
| # Based on | |
| # https://github.com/rancher/rancher/issues/19882#issuecomment-501056386 | |
| ## Cleans up Rancher with Kubernetes *entirely*. | |
| ## After running this script you are able to | |
| ## set up Rancher entirely from scratch | |
| ## without any complaints about remains | |
| ## from the previous installation. | |
| ## Run as root! | |
| ## Only works reliably with GNU Bash. | |
| ## Expects `systemd` on the host. | |
| ################################# Boilerplate of the Boilerplate #################################################### | |
| # Coloured Echoes # | |
| function red_echo { echo -e "\033[31m$@\033[0m"; } # | |
| function green_echo { echo -e "\033[32m$@\033[0m"; } # | |
| function yellow_echo { echo -e "\033[33m$@\033[0m"; } # | |
| function white_echo { echo -e "\033[1;37m$@\033[0m"; } # | |
| # Coloured Printfs # | |
| function red_printf { printf "\033[31m$@\033[0m"; } # | |
| function green_printf { printf "\033[32m$@\033[0m"; } # | |
| function yellow_printf { printf "\033[33m$@\033[0m"; } # | |
| function white_printf { printf "\033[1;37m$@\033[0m"; } # | |
| # Debugging Outputs # | |
| function white_brackets { local args="$@"; white_printf "["; printf "${args}"; white_printf "]"; } # | |
| function echoInfo { local args="$@"; white_brackets $(green_printf "INFO") && echo " ${args}"; } # | |
| function echoWarn { local args="$@"; echo "$(white_brackets "$(yellow_printf "WARN")" && echo " ${args}";)" 1>&2; } # | |
| function echoError { local args="$@"; echo "$(white_brackets "$(red_printf "ERROR")" && echo " ${args}";)" 1>&2; } # | |
| # Silences commands' STDOUT as well as STDERR. # | |
| function silence { local args="$@"; ${args} &>/dev/null; } # | |
| # Check your privilege. # | |
| function checkPriv { if [[ "$EUID" != 0 ]]; then echoError "Please run me as root."; exit 1; fi; } # | |
| # Returns 0 if script is sourced, returns 1 if script is run in a subshell. # | |
| function checkSrc { (return 0 2>/dev/null); if [[ "$?" == 0 ]]; then return 0; else return 1; fi; } # | |
| # Prints directory the script is run from. Useful for local imports of BASH modules. # | |
| # This only works if this function is defined in the actual script. So copy pasting is needed. # | |
| function whereAmI { printf "$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"; } # | |
| # Alternatively, this alias works in the sourcing script, but you need to enable alias expansion. # | |
| alias whereIsMe='printf "$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"' # | |
| ######################################################################################################################### | |
| function containerd_restart { silence "systemctl restart containerd"; } | |
| function rmMetaDB { silence "rm -f /var/lib/containerd/io.containerd.metadata.v1.bolt/meta.db"; } | |
| function docker_start { silence "systemctl start docker"; } | |
| function docker_stop { silence "systemctl stop docker"; } | |
| function finish_line { white_printf "OK\n"; } | |
| function checkSys { | |
| ## Makes sure that script is not accidentally run on wrong target system. | |
| ## Exits if Docker is not installed. | |
| silence "docker version" | |
| if [[ $? == 0 ]]; then | |
| echoInfo "Docker exists." | |
| return 0 | |
| else | |
| echoError "Docker not installed/running on system. Exiting." | |
| exit 1 | |
| fi | |
| } | |
| function docker_restart { | |
| docker_stop | |
| echoInfo "Restarting Docker..." | |
| sleep 10; | |
| docker_start | |
| if [[ $? == 0 ]]; then | |
| echoInfo "Docker restarted!" | |
| return 0 | |
| else | |
| echoError "Docker restart failed!" | |
| white_printf "Manually stop docker then wait 20 seconds and start it again.\n" | |
| exit 1 | |
| fi | |
| } | |
| function rmContainers { | |
| ## Removes ALL containers. | |
| silence "docker rm -f $(docker ps -aq)" && \ | |
| echoInfo "Successfully removed all Docker containers." || \ | |
| echoInfo "No Docker containers exist! Skipping." | |
| } | |
| function rmVolumes { | |
| ## Removes ALL volumes. | |
| silence "docker volume rm $(docker volume ls -q)" && \ | |
| echoInfo "Successfully removed all Docker volumes." || \ | |
| echoInfo "No Docker volumes exist! Skipping." | |
| } | |
| function rmLocs { | |
| ## Removes all Rancher and Kubernetes related folders. | |
| declare -a FOLDERS | |
| FOLDERS=( "/etc/ceph" \ | |
| "/etc/cni" \ | |
| "/etc/kubernetes" \ | |
| "/opt/cni" \ | |
| "/opt/rke" \ | |
| "/run/secrets/kubernetes.io" \ | |
| "/run/calico" \ | |
| "/run/flannel" \ | |
| "/var/lib/calico" \ | |
| "/var/lib/etcd" \ | |
| "/var/lib/cni" \ | |
| "/var/lib/kubelet" \ | |
| "/var/lib/rancher/rke/log" \ | |
| "/var/log/containers" \ | |
| "/var/log/pods" \ | |
| "/var/run/calico" \ | |
| ) | |
| for loc in "${FOLDERS[@]}"; do | |
| if [ -d ${loc} ]; then | |
| timeout 15s rm -fr ${loc} || \ | |
| { \ | |
| echoError "Timed out while trying to remove ${loc}." | |
| yellow_echo "Run \"rm -fr ${loc}\" manually." | |
| exit 2 | |
| } | |
| echoInfo "${loc} successfully deleted." | |
| else | |
| echoInfo "${loc} not found! Skipping." | |
| fi | |
| done | |
| ## Removes Rancher installation from default installation directory. | |
| fail_rloc=false | |
| local rancher_loc="/opt/rancher" | |
| if [ -d ${rancher_loc} ]; then | |
| silence "rm -fr /opt/rancher" | |
| if [[ $? ]]; then | |
| echoInfo "Rancher successfully removed from ${rancher_loc}." | |
| else | |
| echoError "Rancher could not be removed from ${rancher_loc}!" | |
| fail_rloc=true | |
| fi | |
| else | |
| echoInfo "Rancher not found in ${rancher_loc}! Skipping." | |
| fi | |
| } | |
| function cleanFirewall { | |
| ## Removes Firewall entries related to Rancher or Kubernetes. | |
| IPTABLES="/sbin/iptables" | |
| cat /proc/net/ip_tables_names | while read table; do | |
| silence "$IPTABLES -t $table -L -n" | while read c chain rest; do | |
| if test "X$c" = "XChain" ; then | |
| silence "$IPTABLES -t $table -F $chain" | |
| fi | |
| done | |
| silence "$IPTABLES -t $table -X" | |
| done | |
| echoInfo "Firewall rules cleared." | |
| } | |
| function rmDevs { | |
| ## Unmounts all Rancher and Kubernetes related virtual devices and volumes. | |
| fail_mount=false | |
| fail_pvc=false | |
| local -a mount_list=( $(mount | grep tmpfs | grep '/var/lib/kubelet' | awk '{ print $3 }') ) | |
| for mount in "${mount_list[@]}" /var/lib/kubelet /var/lib/rancher; do | |
| silence "umount -f ${mount}" | |
| if [[ $? ]]; then | |
| echoInfo "${mount} successfully unmounted." | |
| else | |
| echoError "${mount} could not be unmounted." | |
| fail_mount=true | |
| fi | |
| done | |
| ## Unmounts all Persistent Volume Claims, forcefully. | |
| local -a pvc_list=( $(mount | grep '/var/lib/kubelet/pods' | awk '{ print $3 }') ) | |
| for pvc in "${pvc_list[@]}"; do | |
| silence "umount -f ${pvc}" | |
| if [[ $? ]]; then | |
| echoInfo "$(printf ${pvc} | cut -c 1-45)... successfully unmounted." | |
| else | |
| echoError "${pvc} could not be unmounted." | |
| fail_pvc=true | |
| fi | |
| done | |
| } | |
| function fazit { | |
| ## Checks for fail flags set during other processes and | |
| ## outputs a summary of possible errors. | |
| local -i err_counter=0 | |
| if [[ $fail_mount == true ]]; then | |
| let "err_counter++" | |
| fi | |
| if [[ $fail_pvc == true ]]; then | |
| let "err_counter++" | |
| fi | |
| if [[ $fail_rloc == true ]]; then | |
| let "err_counter++" | |
| fi | |
| } | |
| ############################################ | |
| ############################################ | |
| # Checks if user running the script is root. | |
| checkPriv | |
| # Makes sure that script is not accidentally run on wrong target system. | |
| # Exits if Docker is not installed. | |
| checkSys | |
| # Removes ALL containers. | |
| rmContainers | |
| # Removes ALL volumes. | |
| rmVolumes | |
| # Unmounts all Rancher and Kubernetes related virtual devices and volumes. | |
| rmDevs | |
| # Removes all Rancher and Kubernetes related folders. | |
| # Removes Rancher installation from default installation directory. | |
| rmLocs | |
| # Removes metadata database. | |
| rmMetaDB | |
| # Removes Firewall entries related to Rancher or Kubernetes. | |
| cleanFirewall | |
| # Restarts services, to apply previous removals. | |
| containerd_restart | |
| # Slowed down Docker restart. Needs a pause, because else it complains about "too quick" restarts. | |
| docker_restart | |
| # Checks for fail flags set during other processes and outputs a summary of possible errors. | |
| fazit | |
| # Process finished. | |
| finish_line |
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