uninstall old version
Older versions of Docker were called docker or docker-engine. If these programs are installed, uninstall them and their associated dependencies.
$ sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
Install Docker Engine-Community
Install using Docker repository
Before installing Docker Engine-Community for the first time on a new host, you need to set up a Docker repository. After that, you can install and update Docker from the repository.
Set up warehouse
Install the required packages. yum-utils provides yum-config-manager, and the device mapper storage driver requires device-mapper-persistent-data and lvm2.
$ sudo yum install -y yum-utils \
device-mapper-persistent-data \
lvm2
Use the following commands to set up a stable Docker repository (used when downloading images).
Ali Cloud:
$ sudo yum-config-manager \
--add-repo \
http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
Install Docker Engine-Community
Install the latest version of Docker Engine-Community and containerd, or go to the next step to install a specific version:
$ sudo yum install docker-ce docker-ce-cli containerd.ioDocker is not started by default after installation, you need to start it manually, and the docker user group has been created, but there are no users under this user group.
$ sudo systemctl start dockerThen use: docker info command to verify whether the startup is successful.
Sometimes we will find that the domain name of the above mirror address has expired or the domestic link is slow, we can use the following solution:
In China, it is sometimes difficult to pull images from DockerHub. In this case, you can configure an image accelerator. Docker official and many domestic cloud service providers provide domestic accelerator services, such as:
- HKUST mirror: https://docker.mirrors.ustc.edu.cn/
- Netease: https://hub-mirror.c.163.com/
- Alibaba Cloud: https://<your ID>.mirror.aliyuncs.com
- Qiniu Cloud Accelerator: https://reg-mirror.qiniu.com
After configuring a certain accelerator address, if you find that the image cannot be pulled, please switch to another accelerator address. All major cloud service providers in China provide Docker image acceleration services. It is recommended to select the corresponding image acceleration service according to the cloud platform running Docker.
Aliyun mirror acquisition address: https://cr.console.aliyun.com/cn-hangzhou/instances/mirrors , after logging in, select Mirror Accelerator on the left menu to see your exclusive address:
The above is the screenshot after I log in with my personal Alipay, pay attention to the red circle part, and then configure the mirror address (note that the system I use here is Centos7):
For systems using systemd (Centos6.4 and above), please write the following content in /etc/docker/daemon.json (if the file does not exist, please create this file: vim daemon.json):
{"registry-mirrors":["https://reg-mirror.qiniu.com/"]}
After that restart the service:
$ sudo systemctl daemon-reload
$ sudo systemctl restart docker
Check whether the accelerator is in effect
Check whether the accelerator is effective After configuring the accelerator, if pulling the image is still very slow, please manually check whether the accelerator configuration is effective, and execute docker info on the command line. If you see the following content from the result, the configuration is successful.
