![]() To resolve MAC address, Container 2 sends ARP request which is answered by the operating system.Container2 generates an Ethernet frame with MAC and IP address of container1.Because container reside on same network embedded DNS servers responds to container2 with info Container 2 sends DNS requests for container1.The Docker engine does not create an overlay network on hosts that do run services. To summarize, the overlay network is only used between containers, while the additional network serves to connect the container to the outside world, and communication between the containers is not allowed on this network. Docker Engine automatically creates a VXLAN support without the need for additional setup.Įngine also creates an additional network to access the outside world. Docker Swarm initialization creates an overlay ingress network. Overlay Driver Network Architectureĭocker overlay network driver is an integral part of the Docker installation that handles high-quality multi-host communication. In the introduction, we’re talking about architecture, external traffic going to Docker services, how DNS services works, different types of load balancing, and finally security and encryption. The Docker overlay network uses VXLAN technology to connect containers in the L2 network located on different hosts. In this section, we will explain the network used when operating the Docker swarm cluster. ![]() From service to the outside world (Egress traffic).Docker Service exposed to outside world. ![]()
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