Docker Networking

Docker provides a networking feature that allows containers to communicate with each other and with external systems. This networking capability is essential for building distributed and scalable microservices architectures.

Docker Network Types

Docker supports several network types that can be used to connect containers:

• Bridge Network: This is the default network created when Docker is installed. It provides communication between containers on the same host.
• Host Network: Containers running on the host network share the host's network stack, which means they can access network resources directly.
• Overlay Network: Overlay networks allow containers to communicate across multiple Docker hosts. This is useful for deploying microservices across a cluster of machines.

Creating a Docker Network

To create a Docker network, you can use the docker network create command followed by a name for the network. For example:

1$ docker network create my-network

This command creates a new network with the name my-network.

Connecting Containers to a Network

Once a network is created, you can connect containers to it using the docker network connect command. For example, to connect a container named my-container to the my-network network:

1$ docker network connect my-network my-container

Viewing Network Details

To view details about a Docker network, you can use the docker network inspect command followed by the network name. For example:

1$ docker network inspect my-network

This command displays information about the network, including the containers connected to it.

Docker networking provides a flexible and powerful way to connect containers and build distributed applications. In the next lesson, we will explore Docker Compose and how to use it to deploy multi-container applications.

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class Main {

  public static void main(String[] args) {

    // Docker networking

    // Java code for creating a Docker network

    // Replace with relevant Java code here

  }

}