For containerized services deployed with tripleo, it's addressed in
https://review.openstack.org/#/c/542858/

** Also affects: tripleo
   Importance: Undecided
       Status: New

** Changed in: tripleo
       Status: New => In Progress

** Changed in: tripleo
    Milestone: None => queens-rc1

** Changed in: tripleo
   Importance: Undecided => High

** Changed in: tripleo
     Assignee: (unassigned) => Brent Eagles (beagles)

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https://bugs.launchpad.net/bugs/1748658

Title:
  Restarting Neutron containers which make use of network namespaces
  doesn't work

Status in neutron:
  New
Status in tripleo:
  In Progress

Bug description:
  When DHCP, L3, Metadata or OVN-Metadata containers are restarted they can't
  set the previous namespaces:

  
  [heat-admin@overcloud-novacompute-0 neutron]$ sudo docker restart 8559f5a7fa45
  8559f5a7fa45


  [heat-admin@overcloud-novacompute-0 neutron]$ tail -f 
/var/log/containers/neutron/networking-ovn-metadata-agent.log 
  2018-02-09 08:34:41.059 5 CRITICAL neutron [-] Unhandled error: 
ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: RTNETLINK 
answers: Invalid argument
  2018-02-09 08:34:41.059 5 ERROR neutron Traceback (most recent call last):
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/bin/networking-ovn-metadata-agent", line 10, in <module>
  2018-02-09 08:34:41.059 5 ERROR neutron     sys.exit(main())
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/lib/python2.7/site-packages/networking_ovn/cmd/eventlet/agents/metadata.py",
 line 17, in main
  2018-02-09 08:34:41.059 5 ERROR neutron     metadata_agent.main()
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/lib/python2.7/site-packages/networking_ovn/agent/metadata_agent.py", line 
38, in main
  2018-02-09 08:34:41.059 5 ERROR neutron     agt.start()
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/lib/python2.7/site-packages/networking_ovn/agent/metadata/agent.py", line 
147, in start
  2018-02-09 08:34:41.059 5 ERROR neutron     self.sync()
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/lib/python2.7/site-packages/networking_ovn/agent/metadata/agent.py", line 
56, in wrapped
  2018-02-09 08:34:41.059 5 ERROR neutron     return f(*args, **kwargs)
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/lib/python2.7/site-packages/networking_ovn/agent/metadata/agent.py", line 
169, in sync
  2018-02-09 08:34:41.059 5 ERROR neutron     metadata_namespaces = 
self.ensure_all_networks_provisioned()
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/lib/python2.7/site-packages/networking_ovn/agent/metadata/agent.py", line 
350, in ensure_all_networks_provisioned
  2018-02-09 08:34:41.059 5 ERROR neutron     netns = 
self.provision_datapath(datapath)
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/lib/python2.7/site-packages/networking_ovn/agent/metadata/agent.py", line 
294, in provision_datapath
  2018-02-09 08:34:41.059 5 ERROR neutron     veth_name[0], veth_name[1], 
namespace)
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/lib/python2.7/site-packages/neutron/agent/linux/ip_lib.py", line 182, in 
add_veth
  2018-02-09 08:34:41.059 5 ERROR neutron     self._as_root([], 'link', 
tuple(args))
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/lib/python2.7/site-packages/neutron/agent/linux/ip_lib.py", line 94, in 
_as_root
  2018-02-09 08:34:41.059 5 ERROR neutron     namespace=namespace)
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/lib/python2.7/site-packages/neutron/agent/linux/ip_lib.py", line 102, in 
_execute
  2018-02-09 08:34:41.059 5 ERROR neutron     
log_fail_as_error=self.log_fail_as_error)
  2018-02-09 08:34:41.059 5 ERROR neutron   File 
"/usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py", line 151, in 
execute
  2018-02-09 08:34:41.059 5 ERROR neutron     raise ProcessExecutionError(msg, 
returncode=returncode)
  2018-02-09 08:34:41.059 5 ERROR neutron ProcessExecutionError: Exit code: 2; 
Stdin: ; Stdout: ; Stderr: RTNETLINK answers: Invalid argument
  2018-02-09 08:34:41.059 5 ERROR neutron 
  2018-02-09 08:34:41.059 5 ERROR neutron 
  2018-02-09 08:34:41.177 21 INFO oslo_service.service [-] Parent process has 
died unexpectedly, exiting
  2018-02-09 08:34:41.178 21 INFO eventlet.wsgi.server [-] (21) wsgi exited, 
is_accepting=True

  
  An easy way to reproduce the bug:

  [heat-admin@overcloud-novacompute-0 ~]$ sudo docker exec -u root -it
  5c5f254a9321bd74b5911f46acb9513574c2cd9a3c59805a85cffd960bcc864d
  /bin/bash

  [root@overcloud-novacompute-0 /]# ip netns a my_netns
  [root@overcloud-novacompute-0 /]# exit

  [heat-admin@overcloud-novacompute-0 ~]$ sudo ip netns
  [heat-admin@overcloud-novacompute-0 ~]$ sudo docker restart 
5c5f254a9321bd74b5911f46acb9513574c2cd9a3c59805a85cffd960bcc864d
  5c5f254a9321bd74b5911f46acb9513574c2cd9a3c59805a85cffd960bcc864d

  [heat-admin@overcloud-novacompute-0 ~]$ sudo docker exec -u root -it 
5c5f254a9321bd74b5911f46acb9513574c2cd9a3c59805a85cffd960bcc864d /bin/bash
  [root@overcloud-novacompute-0 /]# ip netns
  RTNETLINK answers: Invalid argument
  RTNETLINK answers: Invalid argument
  my_netns

  [root@overcloud-novacompute-0 /]# ip netns e my_netns ip a
  RTNETLINK answers: Invalid argument
  setting the network namespace "my_netns" failed: Invalid argument

  Deleting everything under /run/netns/* from kolla_start but this would involve
  a full sync of the agents which is not desirable:

  [root@overcloud-novacompute-0 /]# rm /run/netns/my_netns 
  rm: remove regular empty file '/run/netns/my_netns'? y
  [root@overcloud-novacompute-0 /]# ip netns                
  [root@overcloud-novacompute-0 /]# ip netns a my_netns
  [root@overcloud-novacompute-0 /]#

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