How to Create Network in Docker: Simple Steps and Examples

To create a network in Docker, use the docker network create command followed by the network name. This command sets up a new isolated network that containers can join for communication.

Syntax

The basic syntax to create a Docker network is:

• docker network create [OPTIONS] NETWORK_NAME

Here, NETWORK_NAME is the name you want to give your network. [OPTIONS] can include network driver type and other settings.

bash

docker network create [OPTIONS] NETWORK_NAME

Example

This example creates a user-defined bridge network named my_bridge. Containers connected to this network can communicate with each other.

bash

docker network create my_bridge

Output

a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6q7r8s9t0u1v2w3x4y5z6

Common Pitfalls

Common mistakes when creating Docker networks include:

• Using reserved network names like bridge, host, or none which are default networks.
• Not specifying the driver when a specific network type is needed (default is bridge).
• Trying to create a network with a name that already exists.

Example of wrong and right usage:

bash

# Wrong: Using reserved name

docker network create bridge

# Right: Use a custom name

docker network create custom_bridge

Output

Error response from daemon: network with name bridge already exists

<network ID string>

Quick Reference

Command	Description
docker network create NETWORK_NAME	Create a new network with default bridge driver
docker network create -d driver_name NETWORK_NAME	Create a network with a specific driver (e.g., overlay, macvlan)
docker network ls	List all Docker networks
docker network rm NETWORK_NAME	Remove a Docker network

Key Takeaways

Use docker network create NETWORK_NAME to make a new Docker network.

Avoid reserved names like bridge, host, and none for custom networks.

Specify the driver with -d option if you need a network type other than bridge.

Check existing networks with docker network ls before creating new ones.

Remove unused networks with docker network rm NETWORK_NAME to keep your environment clean.