1. Install a private image repository

Since we need to push to a private mirror warehouse later, we pre-installed it and used the private mirror warehouse Registry developed by Docker.

Download the Docker image of the Registry;
```
docker pull registry:2
```

To use the Docker container to run the Registry service, you need to add environment variables REGISTRY_STORAGE_DELETE_ENABLED=trueto enable the function of deleting images;

# --restart=always 表示开机启动
docker run -p 5000:5000 --name registry2 \
--restart=always \
-e REGISTRY_STORAGE_DELETE_ENABLED="true" \
-d registry:2

Modify the configuration file of Docker Daemon, the file location is /etc/docker/daemon.json, because Docker uses HTTPS to push images by default, but our mirror warehouse does not support it, so we need to add the following configuration to use HTTP push instead;
```
{
      
      
  "insecure-registries": ["192.168.56.120:5000"]
}
```
Modify the ip address to the address where docker is located, if it is local, you can also use localhost
Finally, use the following command to restart the Docker service
```
systemctl daemon-reload && systemctl restart docker
```

2. Mirror warehouse visualization

Since the management of private mirror warehouses is cumbersome, and docker-registry-uithere is a special page for convenient mirror management, we install it to manage private mirror warehouses.

Downloaded docker-registry-uiDocker image;

docker pull joxit/docker-registry-ui:static

Use Docker containers to run docker-registry-uiservices;

docker run -p 8280:80 --name registry-ui \
--link registry2:registry2 \
-e REGISTRY_URL="http://registry2:5000" \
-e DELETE_IMAGES="true" \
-e REGISTRY_TITLE="Registry2" \
-d joxit/docker-registry-ui:static

Just find a docker image to test the availability of the private mirror warehouse we built (take busybox as an example)
```
docker pull busybox
```
Label the image busyboxas a private warehouse, and set the version to v1.0;
```
docker tag busybox localhost:5000/busybox:v1.0
```
Then push it to the private image warehouse;
```
docker push localhost:5000/busybox:v1.0
```
Visit docker-registry-uithe management interface to view busyboxthe mirror, address: http://localhost:8280