Add support to restart crio via the socket

pkgs/bin/init/src/exe.c

@@ -103,6 +103,10 @@ void stop_kubelet(void) {
   kill(kubelet_pid, SIGTERM);
 }
 
+void stop_container_runtime(void) {
+  kill(crio_pid, SIGTERM);
+}
+
 /**
  * Helper function which checks if the given character is an acceptable
  * character in a node label

pkgs/bin/init/src/include/exe.h

@@ -16,6 +16,7 @@
 extern int should_restart_processes;
 
 void start_container_runtime(void);
+void stop_container_runtime(void);
 
 void start_kubelet(void);
 void stop_kubelet(void);

pkgs/bin/init/src/include/socket.h

@@ -12,10 +12,12 @@
  * SHUTDOWN           Request a system shutdown
  * CONTINUE_SHUTDOWN  Continue the shutdown procedure by killing processes and umounting all file systems.
  * RESTART_KUBELET    Requests that the kubelet should be restarted
+ * RESTART_CRIO       Requests that the container runtime should be restarted
  */
 #define CMD_SHUTDOWN 0x01
 #define CMD_CONTINUE_SHUTDOWN 0x02
 #define CMD_RESTART_KUBELET 0x03
+#define CMD_RESTART_CRIO 0x04
 
 /**
  * Events send out by the system

pkgs/bin/init/src/socket.c

@@ -102,6 +102,9 @@ void client_thread(int *connection) {
           // loop will notice and restart it for us.
           stop_kubelet();
           break;
+        case CMD_RESTART_CRIO:
+          stop_container_runtime();
+          break;
       }
     }
     close(*connection);