Cómo desinstalar el clúster

Si experimentas problemas específicos de Kubernetes en el clúster, puede desinstalar directamente el clúster rke2.

1. Dependiendo del perfil de instalación, ejecuta uno de los siguientes comandos:

   1.1. En una instalación en línea, ejecuta el siguiente script con privilegios elevados, es decir sudo, en cada nodo del clúster. Esto desinstalará los nodos.

   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 En una configuración sin conexión, ejecuta el siguiente script con privilegios elevados, es decir sudo, en cada nodo del cluster. Esto desinstalará los nodos.

   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. Limpiar el disco OSD:

   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, Reinicia el nodo tras desinstalar.

   Importante: Al desinstalar uno de los nodos del clúster debes ejecutar el siguiente comando: kubectl delete node <node_name>. Esto elimina el nodo del clúster.