CODEWITHSUNDEEP
dockernetwork-programmingoverlayvpsswarm
Tao Zhu
Tao Zhu

Reputation: 779

Docker Swarm can not communicate with other nodes on custom overlay network

There are 4 node in my swarm, two of them are in Hongkong, the others are in USA. I create 4 service in the swarm:

Service    Location
foo        USA
bar        HK
haha       USA
hehe       HK

These services use a same overlay network. When I try ping foo or ping haha in HK's services, the host can't be resolved. But when I ping bar or ping hehe in HK's services, it works.

Any help will be appreciated, thank you!

I'm sure that all the required ports are open and accessable.

I use these commands to create services:

docker network create -d overlay --attachable test_net
docker service create --name foo --network test_net nginx:alpine

Upvotes: 2

Views: 2238

Answers (1)

BMitch
BMitch

Reputation: 264831

You need to make sure the following ports are open between your docker hosts:

  • TCP port 2377 for cluster management communications

  • TCP and UDP port 7946 for communication among nodes

  • UDP port 4789 for overlay network traffic

See the following for more details: https://docs.docker.com/network/overlay/#operations-for-all-overlay-networks

Upvotes: 1

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