Detailed steps for Docker configuration agent

Preface

In most cases, Docker does not automatically use system proxy settings. You need to explicitly configure the proxy for Docker. If you only set up the system proxy without setting up the proxy in Docker, Docker may not be able to access network resources through the proxy. This is because the Docker container and daemon run in an isolated environment and do not inherit the proxy settings of the host system by default.

PS:

Daemons are services that run in the background and usually do not interact directly with users.

Dockerd Daemon is responsible for managing the life cycle of Docker containers, including creating, running, stopping, and deleting containers. It also handles pulling and storing container images. (for example, docker pull).

How to confirm whether Docker uses proxy

You can confirm and configure Docker using proxy by following the following steps:

1. Check the system proxy settings

First, make sure you have configured the proxy correctly in the system. For example, on Linux, you can~/.bashrcor~/.bash_profileSet up a proxy:

export HTTP_PROXY=127.0.0.1:8080
export HTTPS_PROXY=127.0.0.1:8080
export NO_PROXY=localhost,127.0.0.1

2. Configure Docker to use proxy

Create or edit Docker configuration files

On the Docker host, edit or create/etc/systemd/system//document.

sudo mkdir -p /etc/systemd/system/
sudo nano /etc/systemd/system//

Add proxy configuration to the file:

[Service]
Environment="HTTP_PROXY=127.0.0.1:8080"
Environment="HTTPS_PROXY=127.0.0.1:8080"
Environment="NO_PROXY=localhost,127.0.0.1"

Reload the system daemon and restart Docker

sudo systemctl daemon-reload
sudo systemctl restart docker

3. Verify Docker Agent Configuration

Check Docker information

You can run the following command to confirm whether Docker uses proxy settings:

docker info | grep -i proxy

Test pull mirror

Try pulling the image from Docker Hub or other registry to make sure the proxy configuration is working:

docker pull busybox

4. Configure Docker Compose to use a proxy

If you are using Docker Compose, you also need to make sure Docker Compose uses a proxy. You can add environment variables to the Docker Compose file, or specify a proxy when running the Docker Compose command:

version: '3'
services:
  web:
    image: nginx
    environment:
      - HTTP_PROXY=:8080
      - HTTPS_PROXY=:8080
      - NO_PROXY=localhost,127.0.0.1

Or run Docker Compose on the command line:

HTTP_PROXY=:8080 HTTPS_PROXY=:8080 NO_PROXY=localhost,127.0.0.1 docker-compose up

Summarize

While system proxy settings can affect some system-level tools and applications, Docker runs in an isolated environment and does not inherit the system's proxy settings by default. Therefore, it is necessary to explicitly configure the proxy for Docker. By configuring and verifying Docker's proxy settings by the above steps, you can ensure that Docker correctly accesses network resources through the proxy.

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