feat: add emergency cgroup cleanup script

scripts/gc_cgroups.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+#set -x
+
+POD_IDS=($(crictl pods -q))
+POD_UIDS=()
+
+for POD_ID in ${POD_IDS[@]}; do
+  JSONDUMP="`crictl inspectp ${POD_ID}`"
+  POD_NAME="`echo ${JSONDUMP} | jq -r '.status.metadata.name'`"
+  POD_UID="`echo ${JSONDUMP} | jq -r '.info.runtimeSpec.annotations."io.kubernetes.pod.uid"'`"
+  POD_UIDS+=($POD_UID)
+done
+
+# echo ${POD_UIDS[*]}
+
+CGROUPS=($(find /sys/fs/cgroup/pids/kubepods/*/pod* -type d -depth))
+CGROUPS+=($(find /sys/fs/cgroup/kubepods/*/pod* -type d -depth))
+
+DELETED=0
+for cg in ${CGROUPS[*]}; do
+  valid=0
+  for uid in ${POD_UIDS[*]}; do
+    echo $cg | grep -q $uid && { valid=1; break; }
+  done
+
+  if [ $valid -eq 0 ]; then
+    rmdir $cg
+    ((DELETED=DELETED+1))
+  fi
+done
+
+echo "Removed $DELETED left over cgroup folders."