Multi-host Docker networking

• Consider two docker hosts Server-1 and Server-2.

• On each host a docker container is launched (c1 and c2)

• If c1 and c2 are in same host and same network we can use bridge network driver, which enables communication. Bridge can work with in one system , not across systems

• When we add multiple hosts, then we do it for

  • High availability
  • Fault Tolerance

• We need an orchestrator, to manage multi host docker containers, we have many options, but popular ones are

  • Docker Swarm
  • Kubernetes

• Coming back to networking, in docker we have a driver called as overlay, which can enable multi host networking (Swarm)

• Refer Here for Overlay Networking

• Refer Here for Docker Swarm