The network ports required for a Docker Swarm to function properly are:

  • TCP port 2376 for secure Docker client communication. This port is required for Docker Machine to work. Docker Machine is used to orchestrate Docker hosts.
  • TCP port 2377. This port is used for communication between the nodes of a Docker Swarm or cluster. It only needs to be opened on manager nodes.
  • TCP and UDP port 7946 for communication among nodes (container network discovery).
  • UDP port 4789 for overlay network traffic (container ingress networking).

2376 用于docker machine 在实体机,一般不需要。

# docker machine
firewall-cmd --add-port=2376/tcp --permanent
# manager
firewall-cmd --add-port=2377/tcp --permanent
# communication among nodes (container network discovery).
firewall-cmd --add-port=7946/tcp --permanent
firewall-cmd --add-port=7946/udp --permanent
# overlay network traffic (container ingress networking).
firewall-cmd --add-port=4789/udp --permanent

https://www.digitalocean.com/community/tutorials/how-to-configure-the-linux-firewall-for-docker-swarm-on-centos-7

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