Added some minor changes to the docker orphan clean up process. (#3657)

* Added changes to clean up orphan containers and reload docker & kubelet directories.

* Added new files for cleaning up orphans and docker & kubelet directories

* Added new lines at the end of these files

* removed the trailing whitespaces from main.yml and clean-up.yml

* Updated as per the review comments

* Updated as per the review comments

* Removed service_facts and package_facts because they are not supported in ansible 2.4.0

* Corrected yaml syntax errors

* Removed the use of json_query filter and utilized selectattr

* Removed trailing spaces

* Changed the default value of docker_clean_up to false

* Added Changes to only include cleanup-docker-orphans.sh

* Reverted back changes done inside handler.

* Removed trailing spaces and made default value of docker_orphan_clean_up as true

* Reverted the default value of docker_orphan_clean_up as false

* Made the docker clean up as drop in

* Made the docker clean up as drop in

* Reverted the value of boolean docker_orphan_clean_up to false

* Converted ExecStop to ExecSTartPost. Removed the live restore check from the orphan script

roles/container-engine/docker/files/cleanup-docker-orphans.sh

@@ -10,9 +10,9 @@ list_descendants ()
 }
 
 count_shim_processes=$(pgrep -f ^docker-containerd-shim | wc -l)
-live_restore=$(docker info --format {{.LiveRestoreEnabled}} 2>/dev/null)
 
-if [ ${count_shim_processes} -gt 0 ] && [ -n "${live_restore}" -a "${live_restore}" == "true" ]; then
+
+if [ ${count_shim_processes} -gt 0 ]; then
         # Find all container pids from shims
         orphans=$(pgrep -P $(pgrep -d ',' -f ^docker-containerd-shim) |\
         # Filter out valid docker pids, leaving the orphans
@@ -28,11 +28,11 @@ if [ ${count_shim_processes} -gt 0 ] && [ -n "${live_restore}" -a "${live_restor
 
                 # Recursively kill all child PIDs of orphan shims
                 echo -e "Killing orphan container PIDs and descendants: \n$(ps -O ppid= $orphan_container_pids)"
-                #kill -9 $orphan_container_pids || true
+                kill -9 $orphan_container_pids || true
 
         else
                 echo "No orphaned containers found"
         fi
 else
-        echo "Either live-restore is turned off or the node doesn't have any shim processes."
-fi
+        echo "The node doesn't have any shim processes."
+fi

roles/container-engine/docker/templates/docker-orphan-cleanup.conf.j2

@@ -1,2 +1,2 @@
 [Service]
-ExecStop=-{{ bin_dir }}/cleanup-docker-orphans.sh
+ExecStartPost=-{{ bin_dir }}/cleanup-docker-orphans.sh