Neutron-Gateway Issue

juju
1

Hello,

Lately I have been using Juju to deploy openstack, very successfully I just have a little issue which It seems i can’t seem to find the solution.

Each time i’m deploying or restarting the server where the neutron-gateway and openswitch are running, 3 services are getting uninstalled.

neutron-metadata-agent neutron-dhcp-agent neutron-l3-agent

And each time I need to install them manually to make sure they work correctly.

After doing some logging, which you can find below, it seems that the issue is happening during the Hook script of openswitch? But I don’t know for that reason.

Am I the only one that gets this? Am I doing something wrong?

Thank you.

2020-01-27 10:52:15 DEBUG config-changed Failed to restart os-charm-phy-nic-mtu.service: Unit os-charm-phy-nic-mtu.service not found.
2020-01-27 10:52:15 DEBUG juju-log Generating template context for amqp
2020-01-27 10:52:17 INFO juju-log Loaded template from templates/stein/neutron.conf
2020-01-27 10:52:17 INFO juju-log Rendering from template: /etc/neutron/neutron.conf
2020-01-27 10:52:17 INFO juju-log Wrote template /etc/neutron/neutron.conf.
2020-01-27 10:52:18 INFO juju-log Loaded template from templates/queens/openvswitch_agent.ini
2020-01-27 10:52:18 INFO juju-log Rendering from template: /etc/neutron/plugins/ml2/openvswitch_agent.ini
2020-01-27 10:52:18 INFO juju-log Wrote template /etc/neutron/plugins/ml2/openvswitch_agent.ini.
2020-01-27 10:52:18 WARNING juju-log Support for use of upstream apt_pkg module in conjunctionwith charm-helpers is deprecated since 2019-06-25
2020-01-27 10:52:19 WARNING juju-log Support for use of upstream apt_pkg module in conjunctionwith charm-helpers is deprecated since 2019-06-25

2020-01-27 10:52:20 INFO juju-log Purging [‘neutron-metadata-agent’, ‘neutron-dhcp-agent’]

2020-01-27 10:52:20 DEBUG config-changed Reading package lists…
2020-01-27 10:52:20 DEBUG config-changed Building dependency tree…
2020-01-27 10:52:20 DEBUG config-changed Reading state information…
2020-01-27 10:52:21 DEBUG config-changed The following packages were automatically installed and are no longer required:
2020-01-27 10:52:21 DEBUG config-changed dnsmasq-utils iputils-arping ipvsadm keepalived libsensors4 libsnmp-base
2020-01-27 10:52:21 DEBUG config-changed libsnmp30
2020-01-27 10:52:21 DEBUG config-changed Use ‘apt autoremove’ to remove them.
2020-01-27 10:52:21 DEBUG config-changed The following packages will be REMOVED:
2020-01-27 10:52:21 DEBUG config-changed neutron-dhcp-agent* neutron-l3-agent* neutron-metadata-agent*
2020-01-27 10:52:22 DEBUG config-changed 0 upgraded, 0 newly installed, 3 to remove and 6 not upgraded.
2020-01-27 10:52:22 DEBUG config-changed After this operation, 139 kB disk space will be freed.
(Reading database … 114493 files and directories currently installed.)
2020-01-27 10:52:22 DEBUG config-changed Removing neutron-dhcp-agent (2:14.0.3-0ubuntu1~cloud0) …
2020-01-27 10:52:24 DEBUG config-changed Removing neutron-l3-agent (2:14.0.3-0ubuntu1~cloud0) …
2020-01-27 10:52:26 DEBUG config-changed Removing neutron-metadata-agent (2:14.0.3-0ubuntu1~cloud0) …
(Reading database … 114481 files and directories currently installed.)
2020-01-27 10:52:28 DEBUG config-changed Purging configuration files for neutron-metadata-agent (2:14.0.3-0ubuntu1~cloud0) …
2020-01-27 10:52:30 DEBUG config-changed Purging configuration files for neutron-l3-agent (2:14.0.3-0ubuntu1~cloud0) …
2020-01-27 10:52:33 DEBUG config-changed Purging configuration files for neutron-dhcp-agent (2:14.0.3-0ubuntu1~cloud0) …
2020-01-27 10:52:35 DEBUG config-changed Processing triggers for systemd (237-3ubuntu10.33) …
2020-01-27 10:52:36 DEBUG config-changed Processing triggers for ureadahead (0.100.0-21) …
2020-01-27 10:52:36 DEBUG config-changed ureadahead will be reprofiled on next reboot

2

It sounds very much like you are trying to run nova-compute/neutron-openvswitch on the same host as neutron-gateway. This is known problem and presents exactly as you describe by removing and re-installing packages.

The neutron-gateway node either needs to be on a separate host or in a LXD container. The other alternative is to run neutron-openvswitch in DVR mode.

3

I’ve filed a documentation issue for this in the OpenStack Charms Deployment Guide.

1 Like
4

Oh, very interesting.
Thank you so much for the enlightenment. I was not really sure about this. It makes total sense. Thank you also for giving me options.
Would you suggest an LXD container or a different Host entirely? I’d like to know the downside of that, would it be just performance wise?

I am asking because I am not very sure how DVR mode works, and how my cloud benefit with that. If LXD is not beneficial, I might just sacrifice one Nova-Compute node and keep just Neutron-Gateway installed.

Thanks for the insight