How to check the warehouse address currently used by docker

Docker is a popular open source containerization platform that provides a simple and convenient way to package, distribute and run applications. A Docker container can hold an application with all the dependencies it needs, and can be ported to any Linux environment.

When we use Docker, we need to pull or push container images from a remote Docker repository. In this article, we will introduce how to view the warehouse address that Docker is currently using.

Method 1: Use the docker info command

The first method is to use the docker info command. This command can provide information about the Docker installation, including the configuration details of the Docker server.

To invoke this command, open a terminal and enter the following command:

docker info

The command will return output similar to the following:

Server Version: 19.03.13
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: true
Kernel Version: 4.15.0-128-generic
Operating System: Ubuntu 18.04.3 LTS

where "Server Version" represents the current Docker server version, while "Storage Driver" displays the currently used storage driver. However, we need to dig deeper into this output to find the address of the Docker repository currently being used.

Continuing to scroll down the output, we see some details about the Docker repository:

Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
  127.0.0.0/8
Live Restore Enabled: false

Here, "Registry" displays the address of the Docker repository currently in use. In this example, the Docker warehouse address is https://index.docker.io/v1/.

Method 2: Use the docker config command

The second method is to use the docker config command, which can provide detailed information about the Docker installation, including Docker's default configuration and environment variables.

To invoke this command, open a terminal and enter the following command:

docker config

This command will return a JSON-formatted output containing all Docker configuration and environment variables. We can pick and choose the parts we need from the output.

For example, the following command will only display information about the Docker repository address:

docker config | grep Registry

The command will return output similar to the following:

"Registry": "https://index.docker.io/v1/",

Here, "Registry" displays the current The Docker repository address used. In this example, the Docker warehouse address is https://index.docker.io/v1/.

Summary

In this article, we introduced two methods to view the warehouse address that Docker is currently using. No matter which method you use, you will get information about the Docker server configuration and the repository address to download or upload the Docker container image. If you use Docker frequently, these tips may be very helpful in your work.

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