Public bug reported:
This issue has been observed in RDO 2024.1/OVN 23.03/AlmaLinux 9.
This has also been reproduced in Devstack.
1. Ensure that allow_automatic_vpnagent_failover is set to True
2. Have two VPN agents
3. Set up a VPN connection successfully
4. Disable the agent running the VPN connection
Expected results: The VPN connection is successfully rescheduled to a a
different agent
Actual results: Nothing happens
I have been troubleshooting this for a fair bit, and I have found the following:
In neutron-vpnaas/neutron_vpnaas/db/vpn/vpn_agentschedulers_db.py, the
function get_down_router_bindings tries to get_vpn_agents that are down.
If I add a line in the beginning of the function that tries to get ALL
agents like this:
```python
LOG.info("troubleshooting: " + str(self.core_plugin.get_agents(context)))
```
... and then restart neutron-server and wait for it to run the function,
it prints 'troubleshooting: []', indicating that it finds no agents at
all.
If you do this on a system that has most agents in OVN, but some in the
neutron database (case in point: BGP Dragents), you will see the BGP
agents listed. This makes me believe that the core problem is that
vpnaas never checks for agents in the OVN singleton.
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2089250
Title:
neutron-vpnaas: Automatic VPN Agent failover not working with OVN
driver
Status in neutron:
New
Bug description:
This issue has been observed in RDO 2024.1/OVN 23.03/AlmaLinux 9.
This has also been reproduced in Devstack.
1. Ensure that allow_automatic_vpnagent_failover is set to True
2. Have two VPN agents
3. Set up a VPN connection successfully
4. Disable the agent running the VPN connection
Expected results: The VPN connection is successfully rescheduled to a
a different agent
Actual results: Nothing happens
I have been troubleshooting this for a fair bit, and I have found the
following:
In neutron-vpnaas/neutron_vpnaas/db/vpn/vpn_agentschedulers_db.py, the
function get_down_router_bindings tries to get_vpn_agents that are
down. If I add a line in the beginning of the function that tries to
get ALL agents like this:
```python
LOG.info("troubleshooting: " + str(self.core_plugin.get_agents(context)))
```
... and then restart neutron-server and wait for it to run the
function, it prints 'troubleshooting: []', indicating that it finds no
agents at all.
If you do this on a system that has most agents in OVN, but some in
the neutron database (case in point: BGP Dragents), you will see the
BGP agents listed. This makes me believe that the core problem is
that vpnaas never checks for agents in the OVN singleton.
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https://bugs.launchpad.net/neutron/+bug/2089250/+subscriptions
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