Fix flushing error on container stop

net-dhcp/network.py

@@ -7,6 +7,8 @@ import time
 import threading
 import subprocess
 
+from os import path
+
 import pyroute2
 from pyroute2.netlink.rtnl import rtypes
 import docker
@@ -333,10 +335,13 @@ class ContainerDHCPManager:
     def _on_event(self, dhcp, event_type, _event):
         if event_type == udhcpc.EventType.DECONFIG:
             logger.info('[dhcp container] DECONFIG Event %s', _event)
-            logger.info('[dhcp container] Flushing IP addresses')
-            subprocess.check_call(['nsenter', f'-n{dhcp.netns}', '--', '/sbin/ip', 'address', 'flush', 'dev',
-                str(dhcp.iface['ifname'])], timeout=1, stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL,
-                stderr=subprocess.DEVNULL)
+            if path.lexists('{dhcp.netns}'):
+                logger.info('[dhcp container] Flushing IP addresses')
+                subprocess.check_call(['nsenter', f'-n{dhcp.netns}', '--', '/sbin/ip', 'address', 'flush', 'dev',
+                    str(dhcp.iface['ifname'])], timeout=1, stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL,
+                    stderr=subprocess.DEVNULL)
+            else:
+                logger.info('[dhcp container] Container gone, can\'t flush IP addresses')
         elif event_type == udhcpc.EventType.RENEW or event_type == udhcpc.EventType.BOUND:
             if event_type == udhcpc.EventType.RENEW:
                 logger.info('[dhcp container] RENEW Event %s', _event)