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Cisco Employee

Help with OpenStack Neutron for ACI lab

Hi,

My goal is to play around with OpenStack and ACI, so I'm setting a two node lab Openstack (Liberty) environment on Ubuntu (Trusty) servers. I've setup MySQL, RabbitMQ, Keystone, Glance and Nova successfully.

 

However, after installing and configuring Neutron, the DHCP agent is missing from the list.

 

I've gone through the nova.conf and dhcp_agent.ini files but can't see the problem.

 

I've restarted the dhcp agent service:

root@ubuntu-145:~# service neutron-dhcp-agent restart
neutron-dhcp-agent stop/waiting
neutron-dhcp-agent start/running, process 14741

But the DHCP agent is not in the list.

 

These are the contents of the config files:

dhcp_agent.ini

[DEFAULT]
interface_driver = neutron.agent.linux.interface.BridgeInterfaceDriver
dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq
enable_isolated_metadata = True
[AGENT]e_agent

nova.conf

[DEFAULT]
...
dhcpbridge_flagfile=/etc/nova/nova.conf
dhcpbridge=/usr/bin/nova-dhcpbridge
...
force_dhcp_release=True
...

 

The "neutron agent-list" command shows the metadata agent in the controller node as well as the linux bridge agent in both controller and compute nodes, but I think I should also see the DHCP agent in the controller node.

 

Currently, I see this:

root@ubuntu-145:~# neutron agent-list
+--------------------------------------+--------------------+------------+-------+----------------+---------------------------+
| id                                   | agent_type         | host       | alive | admin_state_up | binary                    |
+--------------------------------------+--------------------+------------+-------+----------------+---------------------------+
| 623b253d-d7cf-4e9b-85e3-34c9ce3d076e | Linux bridge agent | ubuntu-144 | :-)   | True           | neutron-linuxbridge-agent |
| c7571a6a-9e44-434b-8e35-9fdddb7073bb | Linux bridge agent | ubuntu-145 | :-)   | True           | neutron-linuxbridge-agent |
| ca27b709-f2e4-4b72-8415-e8c37a69adf1 | Metadata agent     | ubuntu-145 | :-)   | True           | neutron-metadata-agent    |
+--------------------------------------+--------------------+------------+-------+----------------+---------------------------+

 

The dhcp-agent.log has thrown nothing in the past few hours, so no clues there:

root@ubuntu-145:~# date
Sat Aug 24 22:24:46 CEST 2019
root@ubuntu-145:~#
root@ubuntu-145:~# tail /var/log/neutron/dhcp-agent.log
2019-08-24 19:21:24.566 13352 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 348, in wait
2019-08-24 19:21:24.566 13352 ERROR neutron.agent.dhcp.agent     message = self.waiters.get(msg_id, timeout=timeout)
2019-08-24 19:21:24.566 13352 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 253, in get
2019-08-24 19:21:24.566 13352 ERROR neutron.agent.dhcp.agent     'to message ID %s' % msg_id)
2019-08-24 19:21:24.566 13352 ERROR neutron.agent.dhcp.agent MessagingTimeout: Timed out waiting for a reply to message ID f9d8d0b3e2ef4d21a88f42af5914454a
2019-08-24 19:21:24.566 13352 ERROR neutron.agent.dhcp.agent
2019-08-24 19:21:24.570 13352 WARNING oslo.service.loopingcall [req-351b4137-49c5-4145-a8f3-46f9b00b4516 - - - - -] Function 'neutron.agent.dhcp.agent.DhcpAgentWithStateReport._report_state' run outlasted interval by 30.01 sec
2019-08-24 19:21:50.279 13352 INFO oslo_service.service [req-1820bd4a-7007-4c24-bb37-3781d0470998 - - - - -] Caught SIGTERM, exiting
2019-08-24 19:21:50.280 13352 WARNING oslo_messaging.server [req-1820bd4a-7007-4c24-bb37-3781d0470998 - - - - -] start/stop/wait must be called in the same thread
2019-08-24 19:21:50.280 13352 WARNING oslo_messaging.server [req-1820bd4a-7007-4c24-bb37-3781d0470998 - - - - -] start/stop/wait must be called in the same thread
root@ubuntu-145:~#

What else can I check?

 

Thanks!

 

1 REPLY 1
Highlighted
Cisco Employee

---- Update ------

I just noticed that the Neutron DHCP agent service is hogging the cpu:

root@ubuntu-145:~# top

top - 12:14:31 up 41 min,  1 user,  load average: 1.06, 1.16, 1.09
Tasks: 134 total,   2 running, 132 sleeping,   0 stopped,   0 zombie
%Cpu(s): 85.9 us, 14.0 sy,  0.0 ni,  0.0 id,  0.1 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:   4139144 total,  1118912 used,  3020232 free,    40980 buffers
KiB Swap:  4190204 total,        0 used,  4190204 free.   193544 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND                                               
15372 neutron   20   0   26576  19108   8724 R 93.7  0.5   0:00.26 neutron-dhcp-ag                                       
    1 root      20   0    4580   3668   2572 S  0.0  0.1   0:37.00 init                                                  
    2 root      20   0       0      0      0 S  0.0  0.0   0:00.00 kthreadd                                              
    3 root      20   0       0      0      0 S  0.0  0.0   0:04.52 ksoftirqd/0  

But still, I don't see it in the list from the openstack client.

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