How to configure a connection between nodes and the Docker address?

To set up a connection between nodes and the Docker address, Docker typically uses network features such as Docker Bridge, Overlay networks, or Host network.

1. Docker Bridge — the default standard network where containers receive IP addresses and can communicate with each other through these addresses.

2. Overlay network — used for communication between containers running on different hosts (nodes) in Docker Swarm or Kubernetes. This requires creating an overlay network that connects nodes into a single virtual space.

3. Host network — the container uses the host's network stack directly.

To configure the connection between nodes and the Docker address:

• In Docker Swarm, create an overlay network:

docker network create -d overlay my_overlay_network

• Run services or containers, connecting them to this network:

docker service create --name my_service --network my_overlay_network my_image

• Ensure that the necessary network traffic is open between nodes (usually ports 2377, 7946, 4789).

Thus, containers on different nodes can communicate via internal Docker IP addresses.

If using Kubernetes, a CNI plugin is used to provide network connectivity between pods on different nodes.