How do containers communicate on the bridge network?

Containers communicate on the bridge network using their assigned IP addresses within the subnet of the network. Here’s how it works:

1. Subnet and Gateway: The bridge network has a defined subnet (e.g., 172.17.0.0/16) and a gateway (e.g., 172.17.0.1). Each container connected to this network is assigned an IP address within this subnet.

2. Inter-Container Communication: Containers can communicate with each other using their IP addresses or container names. Docker's internal DNS resolves container names to their respective IP addresses, allowing containers to ping or connect to each other by name.

3. Network Isolation: By default, containers on the bridge network can communicate with each other, but they are isolated from containers on other networks unless explicitly connected.

4. Example Command: To check connectivity, you can use the ping command from one container to another. For example:

   docker exec <container_name> ping <other_container_name>

This setup allows for seamless communication between containers on the same bridge network.