[action] [PR:26844] Fix issue #26776: missing /zmq_swss directory causes orchagent crash

[mssonicbld]

Issue: missing /zmq_swss directory causes orchagent crash

Why I did it

After sonic-net/sonic-swss#4243 was merged (around 2026-04-01), orchagent uses ZMQ with IPC sockets for P4 orchestration. These sockets are bound to paths like ipc:///zmq_swss/p4orch_zmq_swss_ep.
On real SONiC systems: The /zmq_swss directory is bind-mounted into the swss container from the host filesystem via the docker run configuration in rules/docker-orchagent.mk.
On docker-sonic-vs: The container runs standalone (e.g., via containerlab) without a host bind mount, so the /zmq_swss directory doesn't exist. When orchagent tries to bind to the ZMQ IPC endpoint, zmq_bind() fails with errno 2 (No such file or directory), causing orchagent to abort.

How I did it

I've added a directory creation step in the docker-sonic-vs Dockerfile:
File: platform/vs/docker-sonic-vs/Dockerfile.j2
Change: Added lines 171-173 to create the /zmq_swss directory:

How to verify it

The workaround mentioned in the issue (manually creating the directory and restarting) confirms this fix will work:
docker exec mkdir -p /zmq_swss
docker exec supervisorctl
restart start.sh

Which release branch to backport (provide reason below if selected)

• 202305
• 202311
• 202405
• 202411
• 202505
• 202511
  Reason for backporting: docker-sonic-vs crashes on startup due to missing /zmq_swss directory. This bug affects
  stable releases as well, so backporting ensures docker-sonic-vs runs correctly on those branches.

Tested branch (Please provide the tested image version)

• 20200712

Description for the changelog

PR#26776 under sonic-net repo. Added lines 171-173 to create the /zmq_swss directory to ensure that the directory exists inside the container filesystem, allowing orchagent to successfully bind to its ZMQ IPC endpoints and start properly.

Link to config_db schema for YANG module changes

N/A

A picture of a cute animal (not mandatory but encouraged)

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Signed-off-by: Sonic Build Admin sonicbld@microsoft.com

[mssonicbld]

Original PR: #26844

[mssonicbld]

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