The co-hosted ovn-controller support has been present in OVN since OVN
23.03.0. At that point the feature was considered experimental as there
was no way of preventing co-hosted controllers from "fighting" over
conntrack zones for stateful features (NAT, LB, stateful ACLs).
Since then commit f2363f49f6a4 ("controller: Add the capability to specify
a min/max value for ct_zone.") added a way to use different conntrack
zone ranges for co-hosted controllers (since OVN 24.09.0).
And b543a882f8d2 ("test: Test co-hosted ovn-controllers with different CT
range.") adds a test that validates this behavior in our CI (since OVN
26.03.0).
Signed-off-by: Dumitru Ceara <[email protected]>
---
NEWS | 2 ++
controller/ovn-controller.8.xml | 8 +++++---
2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/NEWS b/NEWS
index fcee8b8c2b..3f16ccdfb4 100644
--- a/NEWS
+++ b/NEWS
@@ -97,6 +97,8 @@ Post v26.03.0
- Added a new "ovn-debug lflow-pipeline-oftable-start-list" command that
prints the starting OpenFlow table number of the logical ingress and
egress pipelines.
+ - The support for co-hosting multiple controller instances is now
+ considered stable. Its "experimental" tag has been removed.
OVN v26.03.0 - xxx xx xxxx
--------------------------
diff --git a/controller/ovn-controller.8.xml b/controller/ovn-controller.8.xml
index e355046901..8121f70454 100644
--- a/controller/ovn-controller.8.xml
+++ b/controller/ovn-controller.8.xml
@@ -468,9 +468,11 @@
names on the same host using the same <code>vswitchd</code> instance.
This may be useful when running a hybrid setup with more than one CMS
managing ports on the host, or to use different datapath types on the
- same host. Also note that this ability is highly experimental and
- has known limitations (for example, stateful ACLs are not supported).
- Use at your own risk.
+ same host. In order to support stateful features (ACLs, LBs, NAT) in
+ multiple OVN deployments co-hosted on the same chassis, CMS also need
+ to separate conntrack zone ranges between the co-hosted ovn-controllers
+ through the <code>external_ids:ct-zone-range</code> configuration
+ described in upcoming sections.
</p>
<p>
--
2.55.0
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