Docker network commands: Inspect and manage Docker network isolation, including user-defined networks, container connectivity and safe cleanup. This guide explains what each command does, its syntax, practical examples, useful options, and common mistakes. Commands are shown for typical installations; flags can vary across operating-system and tool versions.
Before you start
Open a terminal appropriate for the operating system shown in the examples. Check that the required tool is installed and that you are running it with the permissions needed for your task. Replace sample names, paths, hostnames and IDs with values from your own environment.
Syntax at a glance
Square brackets usually indicate optional arguments, while uppercase words such as FILE, HOST and PACKAGE are placeholders that you replace. Keep quotes around paths or text that contains spaces. Commands should be tested on a safe sample before being used in production.
Quick command reference
| Command | What it does | Example | Useful options |
|---|---|---|---|
docker network ls | List Docker networks | docker network ls | Built-in bridge, host and none networks may appear |
docker network inspect | Show network configuration and connected endpoints | docker network inspect bridge | --format can query specific fields |
docker network create | Create a user-defined network | docker network create app-net | --driver chooses a network driver; --subnet sets a custom subnet |
docker network connect | Attach a container to an additional network | docker network connect app-net api | --alias adds a network-scoped DNS alias |
docker network rm | Remove one or more networks | docker network rm app-net | The network cannot normally be removed while endpoints remain attached |
Command syntax and examples explained
1. docker network ls
Purpose: List Docker networks.
Syntax
docker network lsExample
docker network lsOptions and notes: Built-in bridge, host and none networks may appear.
Use names/IDs to inspect the network attached to a container.
2. docker network inspect
Purpose: Show network configuration and connected endpoints.
Syntax
docker network inspect NETWORKExample
docker network inspect bridgeOptions and notes: --format can query specific fields.
Output can reveal internal IP addresses and topology.
3. docker network create
Purpose: Create a user-defined network.
Syntax
docker network create NAMEExample
docker network create app-netOptions and notes: --driver chooses a network driver; --subnet sets a custom subnet.
Avoid subnet overlap with host/VPN/network routes.
4. docker network connect
Purpose: Attach a container to an additional network.
Syntax
docker network connect NETWORK CONTAINERExample
docker network connect app-net apiOptions and notes: --alias adds a network-scoped DNS alias.
Connecting networks changes reachability between workloads; apply least privilege.
5. docker network rm
Purpose: Remove one or more networks.
Syntax
docker network rm NETWORKExample
docker network rm app-netOptions and notes: The network cannot normally be removed while endpoints remain attached.
Disconnect dependent containers first and confirm that the network is unused.
Common mistakes and troubleshooting
- Command not found: confirm the tool is installed and available on your PATH; open a new terminal after changing PATH.
- Permission denied: verify the current account, file permissions and target path. Use administrator/root privileges only when genuinely required.
- Unexpected output: check the command version, quoting, current directory and exact arguments. Consult the local help or manual for options supported by your build.
- Destructive operations: preview the target and keep a backup before deleting data, rewriting history, flashing a partition or changing system configuration.
Safety tips
Review every command before running it, especially commands that delete files, change permissions, flash firmware, alter a database or expose a network service. For network scanning and remote administration, work only on devices and systems you own or are authorized to test. Keep credentials, private keys, access tokens and log files private.
Frequently asked questions
Do these commands work on every system?
Not always. Some commands are specific to Windows, Linux, Android, a particular package manager or an installed tool version. Use the syntax shown for your platform and check local help when a flag is unavailable.
Can I copy and run every example exactly?
Use the examples as templates. Replace placeholders such as filenames, package IDs, hostnames and paths with your own values, and verify the effect before executing a command that changes data or system state.
Conclusion
Use this reference as a starting point, then confirm flags in the tool’s official help or manual for your installed version. A clear understanding of syntax, options and side effects makes command-line work more reliable.