Managing Docker Networks

This post will cover topic related to ‘Managing Docker Networks’ with multiple docker command examples and different scenerios. So this will help you to understand the command docker and options available in it. Also this post will explain you how to use docker command.

When managing Docker containers, handling networks is a crucial aspect. The `docker network` command allows users to create, inspect, manage, and remove networks used by Docker containers. By leveraging this command, you can ensure that your containers can communicate with each other as needed while maintaining isolated environments. Below are various examples of how to use `docker network` commands effectively.

1. Create a Network

To create a new Docker network, use the following command:

docker network create my_network

This command creates a new network named `my_network`. The default driver used is `bridge`, which provides isolation and basic connectivity for containers.

Verification: Run docker network ls to list all networks and confirm `my_network` is listed.

2. Inspect a Network

To view detailed information about a network, use:

docker network inspect my_network

This command provides detailed information about `my_network`, including configuration and connected containers.

Verification: Check the output for details on network settings and connected containers.

3. Connect a Container to a Network

To attach a container to a network, use:

docker network connect my_network my_container

This connects the container `my_container` to the `my_network` network, enabling it to communicate with other containers on the same network.

Verification: Run docker network inspect my_network to check if `my_container` is listed as connected.

4. Disconnect a Container from a Network

To remove a container from a network, use:

docker network disconnect my_network my_container

This disconnects `my_container` from `my_network`, stopping it from communicating with other containers on that network.

Verification: Use docker network inspect my_network to confirm that `my_container` is no longer connected.

5. List All Networks

To view all Docker networks, use:

docker network ls

This command lists all networks available in Docker, showing their names and types.

Verification: Review the list output to ensure all expected networks are present.

6. Remove a Network

To delete a network that is no longer needed, use:

docker network rm my_network

This command removes the network named `my_network`. Note that the network must not be in use by any containers.

Verification: Use docker network ls to confirm that `my_network` has been removed from the list.

7. Create a Network with a Specific Driver

To create a network using a specific driver, use:

docker network create --driver overlay my_overlay_network

This creates an overlay network named `my_overlay_network`, suitable for multi-host networking scenarios.

Verification: Check the network type by running docker network inspect my_overlay_network and verifying the driver type.

8. Create a Network with Subnet and Gateway

To define custom subnet and gateway, use:

docker network create --subnet=192.168.1.0/24 --gateway=192.168.1.1 my_custom_network

This creates a network with a specific subnet and gateway, allowing for more controlled network configurations.

Verification: Inspect the network using docker network inspect my_custom_network to confirm subnet and gateway settings.

9. View Network Statistics

To view network statistics, use:

docker network stats my_network

This command shows statistics for the network `my_network`, including traffic and performance metrics.

Verification: Review the statistics output for network performance details.

10. List Containers in a Network

To list containers attached to a specific network, use:

docker network inspect --format '{{range .Containers}}{{.Name}} {{end}}' my_network

This command lists the names of containers connected to `my_network` using a Go template format.

Verification: Verify the list of containers matches the expected output based on your network configuration.

Also check similar articles.

Managing Swarm Secrets
Managing Swarm Nodes
Managing Swarm Configurations
Managing Docker Image Trust
Managing Docker System