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authorDan Sneddon <dsneddon@redhat.com>2016-01-28 18:14:30 -0800
committerDan Sneddon <dsneddon@redhat.com>2016-02-17 10:49:50 -0800
commitd73d74f4be1c994ed45afb32b253faf4a2d16d74 (patch)
treec7adf6252ec65010d32fe56b7db4f003927be2c7 /environments/docker-network.yaml
parentb9e421ec6db97782c4b3024203e827812e87ddf3 (diff)
Add TripleO Heat Template Parameters for Neutron Tenant MTU
This change adds the TripleO Heat Parameters and Puppet hieradata to support setting the MTU for Neutron tenant networks. A new parameter, NeutronTenantMtu is introduced, and this gets used for the NeutronDnsmasqOptions and in Puppet hieradata. NeutronTenantMtu is also used in the Puppet hieradata for both the compute and control nodes. Two values are set: nova::compute::network_device_mtu which sets /etc/nova/nova.conf: network_device_mtu = <NeutronTenantMtu> neutron::network_device_mtu which sets in /etc/neutron/neutron.conf: network_device_mtu = <NeutronTenantMtu> finally, the NeutronDnsmasqOptions parameter becomes a str_format that maps the NeutronTenantMtu onto the DHCP options, so a default of 'dhcp-option-force=26,%MTU%' would be formatted to 'dhcp-option-force=26,1300' if NeutronTenantMtu were 1300. This will set dnsmasq to serve an MTU via DHCP that matches the NeutronTenantMtu: /etc/neutron/dnsmasq-neutron.conf:dhcp-option-force=26,1300 Typically, you would change all three of these settings to use small or jumbo frames in VMs. When using tunneling, NeutronTenantMtu should be set at least 50 bytes smaller than the physical network MTU in order to make room for tunneling overhead. Note that this change does not support setting the MTU on veth interfaces if veth patches are used to br-int instead of OVS patches. Change-Id: I38840e082ee01dc3b6fc78e1dd97f53fa4e63039
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