A way is needed to set DHCP options for VM networking

[Tom Waterhouse]

I have a GRE network using Icehouse (i.0). The VMs need to have their MTU size reduced to account for the additional GRE info. Before using the Cisco installer I modified /etc/neutron/dhcp_agent.ini, setting the dnsmasq_config_file to include the required option information.

At this point I have no option that I am aware of to set DHCP option values, so I manually edited the file. When the Puppet agent runs an update on the controller node the change that I had made is removed.

I need one of the following:

1) a way to set the override
2) a way to set DHCP options
3) the Cisco installer to automatically adjust the MTU for GRE networks

[Mark T. Voelker (mvoelker)]

The dnsmasq_config_file option is parameterized already:

https://github.com/CiscoSystems/puppet-neutron/blob/i.0/manifests/agents/dhcp.pp#L45-L47

That means you can add something like this to user.yaml to change it:

neutron::agents::dhcp::dnsmasq_config_file: '/foo/bar.cfg'

[Tom Waterhouse (tomwater)]

Mark/Chris,

Can either of you direct me to a person that can help me with the OS network configuration for the Cisco OpenStack installer? I had a test system up and running a month ago that was working perfectly. I tried to replicate what I had done in our dev environment and now networking isn’t completely working.

I have implemented the 2_role scenario and can see network traffic making it from a VM to the controller/network node, but not to the outside world. I’ve made a mistake somewhere and am looking to find someone to point that mistake out to me.

Any help would be appreciated.

Tom

[Tom Waterhouse (tomwater)]

The setting did work.

I modified /etc/puppet/data/hiera_data/user.common.yaml, adding

neutron::agents::dhcp::dnsmasq_config_file: '/etc/neutron/dhcp_agent.cfg'

I ran puppet apply -v /etc/puppet/manifests/site.pp on the build server and puppet agent -td --server=openstack-build-server --pluginsync on the controller node.

I did not see the update on the controller node take place until running the pluginsync command.