Docker Image Management and acceleration site
I. concept
To put it simply, an image is a concrete packaged container environment, which does not include a kernel but a compact operating system.
Configure the image acceleration site
When we are in pull Image, docker is downloaded from foreign Docker Hub by default, so it will be very slow. Let's solve this problem by configuring domestic acceleration sites.
1. Edit the / etc/docker/daemon.json file and configure it as follows
{
"registry-mirrors": ["http://hub-mirror.c.163.com"]"
}
2. Restart docker
Systemctl restart docker
3. Check whether the configuration is effective.
Using the docker info command, you can see the acceleration site that Registry Mirrors has displayed for our configuration
III. Mirror management
1. Download the image from the image repository
Docker pull nginx
2. View the image
Docker image ls
You can see the nginx image downloaded in step 1
3. Package the image
Package the nginx image and specify that the archive file name is nginx.tar
Docker save nginx > nginx.tar
4. Delete the image
Docker image rm nginx
At this point, we delete the image and then use ls to view it. We can see that there are no images left.
5. Load the image
Docker load
< nginx.tar 使用load命令将第3步打包的镜像加载回去，再使用ls可以看到镜像加载成功 6、使用镜像创建容器 docker run -itd --name nginx1.0 nginx 这里指定容器名为nginx1.0，镜像为nginx 7、将容器打包 4858b7bd6ad8为第6步创建的容器id docker export 4858b7bd6ad8 >Nginx1.0.tar
8. Create an image using the tar file packaged by the container
Docker image import nginx1.0.tar
Using the ls command to view, we can see that a new image has been created, but both REPOSITORY and tag are empty
We can create the specified REPOSITORY and tag again
Docker image import nginx1.0.tar nginx1.0:v1
9. Mark the image
Docker tag nginx1.0:v1 nginx1.0:v2
A new image is created with a tag of v2
10. View image details
Docker inspect nginx
There is a lot of content in it. Here, only part of it is intercepted. You can see some path information corresponding to the image.
11. View the historical layering of the image
Docke history nginx
You can see the corresponding dockefile command and size of each layer of the mirror.
