Controller nodes
Disable puppet :
# systemctl stop puppet
# systemctl disable puppet
Place a given controller into standby mode :
# pcs cluster standby $(hostname)
Update the MTU for all physical NICs being used by either provider or tenant networks :
# echo MTU=9000 >> /etc/sysconfig/network-scripts/ifcfg-eth0
Update the various Neutron related configuration files :
Note that if tenant networks are being used then we need to allow for the overhead of VXLAN and GRE.
# echo “dhcp-option-force=26,8900” > /etc/neutron/dnsmasq-neutron.conf
# openstack-config –set /etc/neutron/dhcp_agent.ini DEFAULT dnsmasq_config_file /etc/neutron/dnsmasq-neutron.conf
# openstack-config –set /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini agent veth_mtu 8900
# openstack-config –set /etc/neutron/l3_agent.ini DEFAULT network_device_mtu 9000
# openstack-config –set /etc/nova/nova.conf DEFAULT network_device_mtu 9000
Reboot to ensure everything persists.
# reboot
Unstandby the node and repeat on the remaining controllers :
# pcs cluster unstandby $(hostname)
Compute nodes
Disable puppet :
# systemctl stop puppet
# systemctl disable puppet
Update the MTU for all physical NICs being used by either provider or tenant networks :
# echo MTU=9000 >> /etc/sysconfig/network-scripts/ifcfg-eth0
Update the OVS plugin configuration file :
# openstack-config –set /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini agent veth_mtu 8900
# openstack-config –set /etc/nova/nova.conf DEFAULT network_device_mtu 9000
Reboot to ensure everything persists.
# reboot
Can't stop fiddling... 