クラスターをアンインストールする方法

クラスターで実行されている Kubernetes に固有の問題が発生した場合は、rke2 クラスターを直接アンインストールできます。

1. インストール プロファイルに応じて、次のいずれかのコマンドを実行します。

   1.1.オンライン設定では、次のスクリプトをクラスターの各ノードで管理者特権 (つまり、sudo) で実行します。これによりノードがアンインストールされます。

   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 オフライン設定では、次のスクリプトをクラスターの各ノードで管理者特権 (つまり、sudo) で実行します。これによりノードがアンインストールされます。

   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. Run the following cleanup process for OSD disks:

   Important: For Rook-Ceph versions ≥ 1.16, the OSD cleanup procedure is changed. For details, refer to the Rook official documentation.

   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.rules

   3. Reboot the node after uninstall.
   重要: ノードの 1 つをクラスターからアンインストールする場合は、kubectl delete node <node_name> コマンドを実行する必要があります。これにより、クラスターからノードが削除されます。