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How to uninstall the cluster - Automation Suite 2023.10
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Automation Suite on Linux Installation Guide
Last updated Feb 13, 2024

How to uninstall the cluster

If you experience issues specific to Kubernetes running on the cluster, you can directly uninstall the rke2 cluster.

  1. Depending on your installation profile, run one of the following commands:

    1.1. In an online setup, run the following script with elevated privileges, i.e. sudo, on each node of the cluster. This will uninstall the nodes.
    function remove_rke2_entry_from_exclude() {
      local current_exclude_list new_exclude_list
      YUM_CONF_FILE=$1
      if [[ ! -s "${YUM_CONF_FILE}" ]];
      then
        # File is empty
        return
      fi
      current_exclude_list=$(grep 'exclude=' "${YUM_CONF_FILE}" | tail -1)
      if echo "$current_exclude_list" | grep -q 'rke2-*';
      then
        if [[ -w ${YUM_CONF_FILE} ]];
        then
          new_exclude_list=$(printf '%s\n' "${current_exclude_list//rke2-* /}")
          new_exclude_list=$(printf '%s\n' "${new_exclude_list//rke2-*,/}")
          new_exclude_list=$(printf '%s\n' "${new_exclude_list//rke2-\*/}")
          sed -i "/exclude=.*rke2-\*/d" "${YUM_CONF_FILE}"
          echo "${new_exclude_list}" >> "${YUM_CONF_FILE}"
        else
          error "${YUM_CONF_FILE} file is readonly and contains rke2-* under package exclusion. Please remove the entry for AS to work."
        fi
      fi
    }
    
    function enable_rke2_package_upgrade() {
      remove_rke2_entry_from_exclude /etc/dnf/dnf.conf
      remove_rke2_entry_from_exclude /etc/yum.conf
    }
    
    enable_rke2_package_upgrade
    
    service_exists() {
        local n=$1
        if [[ $(systemctl list-units --all -t service --full --no-legend "$n.service" | cut -f1 -d' ') == $n.service ]]; then
            return 0
        else
            return 1
        fi
    }
    if service_exists rke2-server; then
      systemctl stop rke2-server
      systemctl disable rke2-server
    fi
    if service_exists rke2-agent; then
      systemctl stop rke2-agent
      systemctl disable rke2-agent
    fi
    if [ -e /usr/bin/rke2-killall.sh ]
    then
        echo "Running rke2-killall.sh"
        /usr/bin/rke2-killall.sh > /dev/null
    else
        echo "File not found: rke2-killall.sh"
    fi
    if [ -e /usr/bin/rke2-uninstall.sh ]
    then
        echo "Running rke2-uninstall.sh"
        /usr/bin/rke2-uninstall.sh > /dev/null
    else
        echo "File not found: rke2-uninstall.sh"
    fi
    
    crontab -l > backupcron
    sed -i '/backupjob/d' backupcron > /dev/null
    crontab backupcron > /dev/null
    rm -rf backupcron > /dev/null
    rm -rfv /usr/bin/backupjob > /dev/null
    rm -rfv /etc/rancher/ > /dev/null
    rm -rfv /var/lib/rook/ > /dev/null
    rm -rfv /var/lib/longhorn/ > /dev/null
    rm -rfv /var/lib/rancher/rke2/server/db/* > /dev/null
    umount -l -f /var/lib/rancher/rke2/server/db > /dev/null 2>&1 || true
    rm -rfv /var/lib/rancher/* > /dev/null
    umount -l -f /var/lib/rancher
    rm -rfv /var/lib/rancher/* > /dev/null
    while ! rm -rfv /var/lib/kubelet/* > /dev/null; do
      findmnt --list   --submounts  -n -o TARGET  --target /var/lib/kubelet | grep '/var/lib/kubelet/plugins'  | xargs -r umount -f -l
      sleep 5
    done
    umount -l -f /var/lib/kubelet
    rm -rfv /var/lib/kubelet/* > /dev/null
    rm -rfv /datadisk/* > /dev/null
    umount -l -f /datadisk
    rm -rfv /datadisk/* > /dev/null
    rm -rfv ~/.uipath/* > /dev/null
    rm -rfv /etc/sysconfig/rke2-server > /dev/null
    rm -rfv /etc/sysconfig/rke2-agent > /dev/null
    mount /var/lib/rancher
    mkdir -p /var/lib/rancher/rke2/server/db/ && mount -a
    rm -rfv /var/lib/rancher/rke2/server/db/* > /dev/null
    echo "Uninstall RKE complete."function remove_rke2_entry_from_exclude() {
      local current_exclude_list new_exclude_list
      YUM_CONF_FILE=$1
      if [[ ! -s "${YUM_CONF_FILE}" ]];
      then
        # File is empty
        return
      fi
      current_exclude_list=$(grep 'exclude=' "${YUM_CONF_FILE}" | tail -1)
      if echo "$current_exclude_list" | grep -q 'rke2-*';
      then
        if [[ -w ${YUM_CONF_FILE} ]];
        then
          new_exclude_list=$(printf '%s\n' "${current_exclude_list//rke2-* /}")
          new_exclude_list=$(printf '%s\n' "${new_exclude_list//rke2-*,/}")
          new_exclude_list=$(printf '%s\n' "${new_exclude_list//rke2-\*/}")
          sed -i "/exclude=.*rke2-\*/d" "${YUM_CONF_FILE}"
          echo "${new_exclude_list}" >> "${YUM_CONF_FILE}"
        else
          error "${YUM_CONF_FILE} file is readonly and contains rke2-* under package exclusion. Please remove the entry for AS to work."
        fi
      fi
    }
    
    function enable_rke2_package_upgrade() {
      remove_rke2_entry_from_exclude /etc/dnf/dnf.conf
      remove_rke2_entry_from_exclude /etc/yum.conf
    }
    
    enable_rke2_package_upgrade
    
    service_exists() {
        local n=$1
        if [[ $(systemctl list-units --all -t service --full --no-legend "$n.service" | cut -f1 -d' ') == $n.service ]]; then
            return 0
        else
            return 1
        fi
    }
    if service_exists rke2-server; then
      systemctl stop rke2-server
      systemctl disable rke2-server
    fi
    if service_exists rke2-agent; then
      systemctl stop rke2-agent
      systemctl disable rke2-agent
    fi
    if [ -e /usr/bin/rke2-killall.sh ]
    then
        echo "Running rke2-killall.sh"
        /usr/bin/rke2-killall.sh > /dev/null
    else
        echo "File not found: rke2-killall.sh"
    fi
    if [ -e /usr/bin/rke2-uninstall.sh ]
    then
        echo "Running rke2-uninstall.sh"
        /usr/bin/rke2-uninstall.sh > /dev/null
    else
        echo "File not found: rke2-uninstall.sh"
    fi
    
    crontab -l > backupcron
    sed -i '/backupjob/d' backupcron > /dev/null
    crontab backupcron > /dev/null
    rm -rf backupcron > /dev/null
    rm -rfv /usr/bin/backupjob > /dev/null
    rm -rfv /etc/rancher/ > /dev/null
    rm -rfv /var/lib/rook/ > /dev/null
    rm -rfv /var/lib/longhorn/ > /dev/null
    rm -rfv /var/lib/rancher/rke2/server/db/* > /dev/null
    umount -l -f /var/lib/rancher/rke2/server/db > /dev/null 2>&1 || true
    rm -rfv /var/lib/rancher/* > /dev/null
    umount -l -f /var/lib/rancher
    rm -rfv /var/lib/rancher/* > /dev/null
    while ! rm -rfv /var/lib/kubelet/* > /dev/null; do
      findmnt --list   --submounts  -n -o TARGET  --target /var/lib/kubelet | grep '/var/lib/kubelet/plugins'  | xargs -r umount -f -l
      sleep 5
    done
    umount -l -f /var/lib/kubelet
    rm -rfv /var/lib/kubelet/* > /dev/null
    rm -rfv /datadisk/* > /dev/null
    umount -l -f /datadisk
    rm -rfv /datadisk/* > /dev/null
    rm -rfv ~/.uipath/* > /dev/null
    rm -rfv /etc/sysconfig/rke2-server > /dev/null
    rm -rfv /etc/sysconfig/rke2-agent > /dev/null
    mount /var/lib/rancher
    mkdir -p /var/lib/rancher/rke2/server/db/ && mount -a
    rm -rfv /var/lib/rancher/rke2/server/db/* > /dev/null
    echo "Uninstall RKE complete."
    1.2 In an offline setup, run the following script with elevated privileges, i.e. sudo, on each node of the cluster. This will uninstall the nodes.
    function remove_rke2_entry_from_exclude() {
      local current_exclude_list new_exclude_list
      YUM_CONF_FILE=$1
      if [[ ! -s "${YUM_CONF_FILE}" ]];
      then
        # File is empty
        return
      fi
      current_exclude_list=$(grep 'exclude=' "${YUM_CONF_FILE}" | tail -1)
      if echo "$current_exclude_list" | grep -q 'rke2-*';
      then
        if [[ -w ${YUM_CONF_FILE} ]];
        then
          new_exclude_list=$(printf '%s\n' "${current_exclude_list//rke2-* /}")
          new_exclude_list=$(printf '%s\n' "${new_exclude_list//rke2-*,/}")
          new_exclude_list=$(printf '%s\n' "${new_exclude_list//rke2-\*/}")
          sed -i "/exclude=.*rke2-\*/d" "${YUM_CONF_FILE}"
          echo "${new_exclude_list}" >> "${YUM_CONF_FILE}"
        else
          error "${YUM_CONF_FILE} file is readonly and contains rke2-* under package exclusion. Please remove the entry for AS to work."
        fi
      fi
    }
    
    function enable_rke2_package_upgrade() {
      remove_rke2_entry_from_exclude /etc/dnf/dnf.conf
      remove_rke2_entry_from_exclude /etc/yum.conf
    }
    
    enable_rke2_package_upgrade
    
    service_exists() {
        local n=$1
        if [[ $(systemctl list-units --all -t service --full --no-legend "$n.service" | cut -f1 -d' ') == $n.service ]]; then
            return 0
        else
            return 1
        fi
    }
    if service_exists rke2-server; then
      systemctl stop rke2-server
      systemctl disable rke2-server
    fi
    if service_exists rke2-agent; then
      systemctl stop rke2-agent
      systemctl disable rke2-agent
    fi
    if [ -e /usr/local/bin/rke2-killall.sh ]
    then
      echo "Running rke2-killall.sh"
      /usr/local/bin/rke2-killall.sh > /dev/null
    else
      echo "File not found: rke2-killall.sh"
    fi
    if [ -e /usr/local/bin/rke2-uninstall.sh ]
    then
      echo "Running rke2-uninstall.sh"
      /usr/local/bin/rke2-uninstall.sh > /dev/null
    else
        echo "File not found: rke2-uninstall.sh"
    fi
    
    crontab -l > backupcron
    sed -i '/backupjob/d' backupcron > /dev/null
    crontab backupcron > /dev/null
    rm -rf backupcron > /dev/null
    rm -rfv /usr/bin/backupjob > /dev/null
    rm -rfv /etc/rancher/ > /dev/null
    rm -rfv /var/lib/rook/ > /dev/null
    rm -rfv /var/lib/longhorn/ > /dev/null
    rm -rfv /var/lib/rancher/rke2/server/db/* > /dev/null
    umount -l -f /var/lib/rancher/rke2/server/db > /dev/null 2>&1 || true
    rm -rfv /var/lib/rancher/* > /dev/null
    umount -l -f /var/lib/rancher
    rm -rfv /var/lib/rancher/* > /dev/null
    while ! rm -rfv /var/lib/kubelet/* > /dev/null; do
      findmnt --list   --submounts  -n -o TARGET  --target /var/lib/kubelet | grep '/var/lib/kubelet/plugins'  | xargs -r umount -f -l
      sleep 5
    done
    umount -l -f /var/lib/kubelet
    rm -rfv /var/lib/kubelet/* > /dev/null
    rm -rfv /datadisk/* > /dev/null
    umount -l -f /datadisk
    rm -rfv /datadisk/* > /dev/null
    rm -rfv ~/.uipath/* > /dev/null
    rm -rfv /etc/sysconfig/rke2-server > /dev/null
    rm -rfv /etc/sysconfig/rke2-agent > /dev/null
    mount /var/lib/rancher
    mkdir -p /var/lib/rancher/rke2/server/db/ && mount -a
    rm -rfv /var/lib/rancher/rke2/server/db/* > /dev/null
    echo "Uninstall RKE complete."function remove_rke2_entry_from_exclude() {
      local current_exclude_list new_exclude_list
      YUM_CONF_FILE=$1
      if [[ ! -s "${YUM_CONF_FILE}" ]];
      then
        # File is empty
        return
      fi
      current_exclude_list=$(grep 'exclude=' "${YUM_CONF_FILE}" | tail -1)
      if echo "$current_exclude_list" | grep -q 'rke2-*';
      then
        if [[ -w ${YUM_CONF_FILE} ]];
        then
          new_exclude_list=$(printf '%s\n' "${current_exclude_list//rke2-* /}")
          new_exclude_list=$(printf '%s\n' "${new_exclude_list//rke2-*,/}")
          new_exclude_list=$(printf '%s\n' "${new_exclude_list//rke2-\*/}")
          sed -i "/exclude=.*rke2-\*/d" "${YUM_CONF_FILE}"
          echo "${new_exclude_list}" >> "${YUM_CONF_FILE}"
        else
          error "${YUM_CONF_FILE} file is readonly and contains rke2-* under package exclusion. Please remove the entry for AS to work."
        fi
      fi
    }
    
    function enable_rke2_package_upgrade() {
      remove_rke2_entry_from_exclude /etc/dnf/dnf.conf
      remove_rke2_entry_from_exclude /etc/yum.conf
    }
    
    enable_rke2_package_upgrade
    
    service_exists() {
        local n=$1
        if [[ $(systemctl list-units --all -t service --full --no-legend "$n.service" | cut -f1 -d' ') == $n.service ]]; then
            return 0
        else
            return 1
        fi
    }
    if service_exists rke2-server; then
      systemctl stop rke2-server
      systemctl disable rke2-server
    fi
    if service_exists rke2-agent; then
      systemctl stop rke2-agent
      systemctl disable rke2-agent
    fi
    if [ -e /usr/local/bin/rke2-killall.sh ]
    then
      echo "Running rke2-killall.sh"
      /usr/local/bin/rke2-killall.sh > /dev/null
    else
      echo "File not found: rke2-killall.sh"
    fi
    if [ -e /usr/local/bin/rke2-uninstall.sh ]
    then
      echo "Running rke2-uninstall.sh"
      /usr/local/bin/rke2-uninstall.sh > /dev/null
    else
        echo "File not found: rke2-uninstall.sh"
    fi
    
    crontab -l > backupcron
    sed -i '/backupjob/d' backupcron > /dev/null
    crontab backupcron > /dev/null
    rm -rf backupcron > /dev/null
    rm -rfv /usr/bin/backupjob > /dev/null
    rm -rfv /etc/rancher/ > /dev/null
    rm -rfv /var/lib/rook/ > /dev/null
    rm -rfv /var/lib/longhorn/ > /dev/null
    rm -rfv /var/lib/rancher/rke2/server/db/* > /dev/null
    umount -l -f /var/lib/rancher/rke2/server/db > /dev/null 2>&1 || true
    rm -rfv /var/lib/rancher/* > /dev/null
    umount -l -f /var/lib/rancher
    rm -rfv /var/lib/rancher/* > /dev/null
    while ! rm -rfv /var/lib/kubelet/* > /dev/null; do
      findmnt --list   --submounts  -n -o TARGET  --target /var/lib/kubelet | grep '/var/lib/kubelet/plugins'  | xargs -r umount -f -l
      sleep 5
    done
    umount -l -f /var/lib/kubelet
    rm -rfv /var/lib/kubelet/* > /dev/null
    rm -rfv /datadisk/* > /dev/null
    umount -l -f /datadisk
    rm -rfv /datadisk/* > /dev/null
    rm -rfv ~/.uipath/* > /dev/null
    rm -rfv /etc/sysconfig/rke2-server > /dev/null
    rm -rfv /etc/sysconfig/rke2-agent > /dev/null
    mount /var/lib/rancher
    mkdir -p /var/lib/rancher/rke2/server/db/ && mount -a
    rm -rfv /var/lib/rancher/rke2/server/db/* > /dev/null
    echo "Uninstall RKE complete."
  2. Clean up the OSD disk:

    for osddisk in $(find /dev/uipath/ceph -maxdepth 1 -mindepth 1 -type l); do
      devName=$(basename "${osddisk}")
      devPath="/dev/${devName}"
      sgdisk --zap-all "${devPath}"
      dd if=/dev/zero of="${devPath}" bs=1M count=100 oflag=direct,dsync
      blkdiscard "${devPath}"
    done
    ls /dev/mapper/ceph-* | xargs -I% -- dmsetup remove %  
    rm -rf /dev/ceph-*
    rm -rf /etc/udev/rules.d/99-ceph-raw-osd.rulesfor osddisk in $(find /dev/uipath/ceph -maxdepth 1 -mindepth 1 -type l); do
      devName=$(basename "${osddisk}")
      devPath="/dev/${devName}"
      sgdisk --zap-all "${devPath}"
      dd if=/dev/zero of="${devPath}" bs=1M count=100 oflag=direct,dsync
      blkdiscard "${devPath}"
    done
    ls /dev/mapper/ceph-* | xargs -I% -- dmsetup remove %  
    rm -rf /dev/ceph-*
    rm -rf /etc/udev/rules.d/99-ceph-raw-osd.rules

    3, Reboot the node after uninstall.

    Important: When uninstalling one of the nodes from the cluster, you must run the following command: kubectl delete node <node_name>. This removes the node from the cluster.
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