How to configure an accelerator for Docker

Docker is a popular containerization solution that has been widely recognized and used for its lightweight, elastic expansion and easy migration characteristics. However, when using Docker to build and run applications, the download speed of container images often becomes a bottleneck. At this time, configuring the Docker accelerator can increase the download speed and shorten the waiting time.

This article will introduce how to configure an accelerator for Docker.

Docker Image Accelerator

Docker Image Accelerator is a server that can quickly download Docker images in Docker Hub. Docker Hub is a public Docker image repository where many developers and organizations upload their Docker images. However, due to limitations of the domestic network environment, downloading these images is relatively slow. Therefore, choosing a suitable Docker image accelerator can speed up the image download speed.

Here are some common Docker image accelerators.

DaoCloud Accelerator

DaoCloud is a technology company that provides Docker image accelerator services. Using DaoCloud accelerator, you can quickly obtain Docker images from the DaoCloud image warehouse. DaoCloud's Docker accelerator address is https://www.daocloud.io/mirror.

Alibaba Cloud Accelerator

Alibaba Cloud also provides a Docker image accelerator. You can use the Alibaba Cloud accelerator to quickly download the Docker image in Docker Hub. Alibaba Cloud's Docker accelerator address is https://<username>.mirror.aliyuncs.com</username> (where is the Alibaba Cloud account). To use Alibaba Cloud accelerator, you need to first create the accelerator on the Alibaba Cloud backend console.

Docker official accelerator

Docker official also provides Docker image accelerator service, which can quickly download Docker images in Docker Hub. Docker’s official Docker accelerator address is https://registry.docker-cn.com.

Configuring the accelerator

Linux system

For Linux system, you can add registry in the /etc/docker/daemon.json file -mirrors field to configure the Docker image accelerator. If the file does not exist, a new file can be created.

Open the terminal and use the following command to create a new daemon.json file.

$ sudo mkdir /etc/docker
$ sudo nano /etc/docker/daemon.json

Add the following content to the file:

{
  "registry-mirrors": ["<mirror-url>"]
}</mirror-url>

Among them, <mirror-url></mirror-url> is the address of the Docker mirror accelerator. For example, for DaoCloud image accelerator, add the following content:

{
  "registry-mirrors": ["https://www.daocloud.io/mirror"]
}

Save the file and exit. Then restart the Docker service.

$ sudo systemctl restart docker

macOS system

For macOS system, you can configure the Docker image accelerator through the settings page in the Docker Desktop application. In the Docker Desktop application, click the Docker icon in the upper left corner, select Preferences, and enter the settings page.

In the settings page, select the Docker Engine tab, and then add the following content in the JSON text area:

{
  "registry-mirrors": ["<mirror-url>"]
}</mirror-url>

where, <mirror-url></mirror-url> is the address of the Docker mirror accelerator. For example, for DaoCloud image accelerator, add the following content:

{
  "registry-mirrors": ["https://www.daocloud.io/mirror"]
}

Save the settings and exit. Then restart the Docker service.

Summary

Through the above configuration method, you can configure an accelerator for Docker and improve the download speed of Docker images. For developers who need to frequently download Docker images from Docker Hub, configuring the Docker image accelerator can save a lot of waiting time.

I hope that through the introduction of this article, everyone can understand how to configure an accelerator for Docker.

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