neutron/tools/ovn_migration
Jakub Libosvar 208fea3bf6 ovn-migration: Use DHCP nodes to configure dnsmasq
Previously, the migration script used controller nodes to configure
dnsmasq when configuring new MTU. Controller nodes may not run DHCP
agents. The patch detects DHCP agents instead and uses those to
configure dnsmasq.

Closes-bug: #1928450

Change-Id: Ib468c04779af7aaf4dedf84ba885bce71078248b
Signed-off-by: Jakub Libosvar <libosvar@redhat.com>
(cherry picked from commit 569aa4452a)
2021-05-14 09:43:59 +00:00
..
infrared/tripleo-ovn-migration ovn-migration: Remove docker references 2020-06-25 10:51:54 +02:00
tripleo_environment ovn-migration: Use DHCP nodes to configure dnsmasq 2021-05-14 09:43:59 +00:00
README.rst Migrate the OVN migration scripts 2020-03-31 15:35:35 +01:00
hosts.sample Migrate the OVN migration scripts 2020-03-31 15:35:35 +01:00
migrate-to-ovn.yml Migrate the OVN migration scripts 2020-03-31 15:35:35 +01:00

README.rst

Migration from ML2/OVS to ML2/OVN

Proof-of-concept ansible script for migrating an OpenStack deployment that uses ML2/OVS to OVN.

If you have a tripleo ML2/OVS deployment then please see the folder tripleo_environment

Prerequisites:

  1. Ansible 2.2 or greater.
  2. ML2/OVS must be using the OVS firewall driver.

To use:

  1. Create an ansible inventory with the expected set of groups and variables as indicated by the hosts-sample file.

  2. Run the playbook:

    $ ansible-playbook migrate-to-ovn.yml -i hosts

Testing Status:

  • Tested on an RDO cloud on CentOS 7.3 based on Ocata.
  • The cloud had 3 controller nodes and 6 compute nodes.
  • Observed network downtime was 10 seconds.
  • The "--forks 10" option was used with ansible-playbook to ensure that commands could be run across the entire environment in parallel.

MTU:

  • If migrating an ML2/OVS deployment using VXLAN tenant networks to an OVN deployment using Geneve for tenant networks, we have an unresolved issue around MTU. The VXLAN overhead is 30 bytes. OVN with Geneve has an overhead of 38 bytes. We need the tenant networks MTU adjusted for OVN and then we need all VMs to receive the updated MTU value through DHCP before the migration can take place. For testing purposes, we've just hacked the Neutron code to indicate that the VXLAN overhead was 38 bytes instead of 30, bypassing the issue at migration time.