Bug 2213683

Summary:	the amphora instance sending packets over vxlan MTU
Product:	Red Hat OpenStack	Reporter:	jiehuang
Component:	documentation	Assignee:	James Smith <jamsmith>
Status:	CLOSED MIGRATED	QA Contact:	RHOS Documentation Team <rhos-docs>
Severity:	low	Docs Contact:
Priority:	unspecified
Version:	16.2 (Train)	CC:	ekuris, gregraka, gthiemon, ihrachys, jamsmith, mariel, tweining, yatanaka
Target Milestone:	---	Keywords:	Triaged
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2024-05-09 16:38:14 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description jiehuang 2023-06-09 02:34:14 UTC

Description of problem:
the amphora instance sending packets over vxlan MTU

Version-Release number of selected component (if applicable):
16.2

How reproducible:
Run a ML2/OVN + VXLAN environment and create loadbalancer 

Steps to Reproduce:
1. deployed overcloud with ML2/OVN + VXLAN


(undercloud) [stack@undercloud ~]$ cat overcloud_deploy.sh 
#!/usr/bin/bash

openstack overcloud deploy --templates \
  -r /home/stack/roles_data.yaml \
  -n /home/stack/network_data.yaml \
  -e /home/stack/templates/scheduler_hints_env.yaml \
  -e /home/stack/templates/node-info.yaml \
  -e /home/stack/containers-prepare-parameter.yaml \
  -e /home/stack/inject-trust-anchor-hiera.yaml \
  -e /usr/share/openstack-tripleo-heat-templates/environments/enable-legacy-telemetry.yaml \
  -e /usr/share/openstack-tripleo-heat-templates/environments/network-isolation.yaml \
  -e /usr/share/openstack-tripleo-heat-templates/environments/network-environment.yaml \
  -e /usr/share/openstack-tripleo-heat-templates/environments/services/octavia.yaml \
  -e /home/stack/templates/custom-network-configuration.yaml \
  -e /home/stack/templates/fencing.yaml \
  -e /usr/share/openstack-tripleo-heat-templates/environments/compute-instanceha.yaml \
  -e /home/stack/templates/post_config.yaml \
  -e /home/stack/templates/neutron-network-type.yaml \
 --ntp-server 192.168.24.254

(undercloud) [stack@undercloud ~]$ cat /home/stack/templates/neutron-network-type.yaml
parameter_defaults:
  NeutronNetworkType: vxlan,vlan

2. (overcloud) [stack@undercloud ~]$ openstack loadbalancer create --name test1 --vip-subnet-id public
(overcloud) [stack@undercloud ~]$ openstack server list --all
+--------------------------------------+----------------------------------------------+--------+--------------------------+----------------------------------------+------------+
| ID                                   | Name                                         | Status | Networks                 | Image                                  | Flavor     |
+--------------------------------------+----------------------------------------------+--------+--------------------------+----------------------------------------+------------+
| c9747646-969d-4fc8-aa53-6dd896b291d2 | amphora-4b79b899-969f-4ba3-a83a-fb8f4569f5a3 | ACTIVE | lb-mgmt-net=172.24.1.243 | octavia-amphora-16.2-20230412.1.x86_64 | octavia_65 |
| 76100584-05ef-4841-b7d1-860f8197910e | amphora-507fd617-8886-4956-9203-8e747e000d93 | ACTIVE | lb-mgmt-net=172.24.2.69  | octavia-amphora-16.2-20230412.1.x86_64 | octavia_65 |
+--------------------------------------+----------------------------------------------+--------+--------------------------+----------------------------------------+------------+
(overcloud) [stack@undercloud ~]$ openstack loadbalancer list 
+--------------------------------------+-------+----------------------------------+-------------+---------------------+----------+
| id                                   | name  | project_id                       | vip_address | provisioning_status | provider |
+--------------------------------------+-------+----------------------------------+-------------+---------------------+----------+
| 5c80f6a8-0e25-4d53-94e9-a204344e5758 | test1 | 3b414446295548ec9726ec79031b064a | 10.1.1.114  | PENDING_CREATE      | amphora  |
+--------------------------------------+-------+----------------------------------+-------------+---------------------+----------+

Actual results:
Counld't create

Expected results:
Create successfully

Additional info:

Comment 9 Ihar Hrachyshka 2023-06-15 17:43:38 UTC

Indeed if they use VXLAN for anything, regardless of Octavia or any other services built on top of Neutron networks, they have to configure both neutron plugin to allow creation of vxlan networks (NeutronNetworkType) and OVN to configure the corresponding vxlan tunnels between nodes. (OVNEncapType)

Comment 10 Ihar Hrachyshka 2023-06-15 17:44:44 UTC

Switching to documentation because it has nothing to do with Octavia.

Comment 11 Ihar Hrachyshka 2023-06-15 19:26:01 UTC

This has nothing to do with Octavia, moving to Squad:Neutron who is overseeing OVN integration.

Comment 12 Ihar Hrachyshka 2023-06-15 19:27:18 UTC

The request here is to document tripleo knobs to configure vxlan. Since this setup has a number of important limitations, we should of course explain these and in general discourage using VXLAN.