Docker Swarm and VMware NSX

Swarm Hints and Tips
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If you are running NSX on your VMware environment you will likely run into issues with Docker’s overlay networking. In particular, overlay networking uses UDP port 4789 by default which conflicts with VMware NSX’s communication port for VXLAN.

To resolve this, you can change the data path port for your Docker Swarm setup to a different value (for example, 9789 )

docker swarm init --data-path-port=9789

Alternatively you can (depending on your setup) reconfigure NSX to use a different VXLAN port. You’ll find instructions on how to do this here: Change VXLAN Port

1 Like
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I spent several hours pulling my hair out over this and thankfully stumbled across this post.
Rebuilding the swam with the ‘data-path-port’ changed finally fixed the issues.

I can’t thank you enough!

Lee

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Is why this forum exists… just not enough Swarm support material out there, so im trying to aggregate it here…

Glad your issue got resolved.