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---
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title: "Issues with Docker Swarm on ESXi"
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description: "How to make Docker Swarm work with Nodes on ESXi"
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publishdate: "2021-04-20"
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author: "Adora 🌹"
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draft: true
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---
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I once tried to set up a Docker Swarm Cluster. I had three nodes, two on Proxmox hosts, and one on a ESXi 7 host. The nodes had a GlusterFS storage attached to them which synced data to all three nodes so containers could be started on any node.
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Everything worked wonderfully. Until I found out that some Containers couldn't talk to others.
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Off to troubleshooting then. It seemed very sporadic, with communication working most of the time somehow. I tried some things, until I found out that it only happens if a container on the ESXi node tried to talk to others on the Proxmox nodes.
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After _A LOT_ of googling and searching many a reddit thread I finally found out why:
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It seems like ESXi, even when in standalone mode, silently drops packets on `udp/4789`, which apparently is VMWares `VTEP VXLAN Port for NSX-T`.
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The fix for the Swarm cluster is to (re-)create the Swarm Cluster with `--data-path-port=xxxx`:
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```
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docker swarm init --data-path-port=(port that's not 4789)
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```
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Afterwards all communication works again 🎉
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---
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title: My Blog 🌸
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description: "Lauras Blog about random stuff :3"
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---
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I'll be posting about random stuff here :3 IT, Politics, Love...
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Posts will be in _English_ and in _German_!
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Contact: mailto:security@lauka.net
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Expires: 2033-08-08T21:59:00.000Z
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Contact: mailto:security@lila.network
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Expires: 2034-10-10T21:59:00.000Z
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Preferred-Languages: en, de
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Canonical: https://www.lauka.net/.well-known/security.txt
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Canonical: https://adora.codes/.well-known/security.txt
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