Installation of Docker in Centos8 of container technology

1, Docker introduction

Docker Manual: https://docs.docker.com/install/linux/docker-ce/centos/

Docker is an open source / 246339) application container engine, which allows developers to package their applications and dependency packages into a portable image, and then publish them to any popular Linux or Windows machine, or realize virtualization. Containers are completely sandboxed and have no interface with each other.

2, Docker installation

2.1. Delete the old Docker

[root@localhost ~]#  yum remove docker docker-common docker-selinux docker-engine
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository PowerTools is listed more than once in the configuration
Repository AppStream is listed more than once in the configuration
 No matching parameters found: docker
 No matching parameters found: docker common
 No matching parameters found: docker SELinux
 No matching parameters found: docker engine
 No packages need to be removed.
Dependency resolution.
No processing is required.
Complete!

2.2. Installation dependency

[root@localhost ~]# yum install -y yum-utils \
>   device-mapper-persistent-data \
>   lvm2
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository PowerTools is listed more than once in the configuration
Repository AppStream is listed more than once in the configuration
CentOS-8 - Base                                                                                               3.3 MB/s | 4.0 MB     00:01    
Extra Packages for Enterprise Linux Modular 8 - x86_64                                                        7.9 kB/s |  13 kB     00:01    
The package device-mapper-persistent-data-0.8.5-2.el8.x86_isinstalled.
Package lvm2-8: 2.03.05-5.el8.0.1.x86_isinstalled.
Dependency resolution.
==============================================================================================================================================
 Package architecture version warehouse size
==============================================================================================================================================
Installation:
 yum-utils                         noarch                         4.0.8-3.el8                            BaseOS                          64 k

Transaction summary
==============================================================================================================================================
Install 1 package

Total downloads: 64 k
 Installation size: 19 k
 Download package:
yum-utils-4.0.8-3.el8.noarch.rpm                                                                              295 kB/s |  64 kB     00:00    
----------------------------------------------------------------------------------------------------------------------------------------------
Total 87 KB / s | 64 kb 00:00     
Run transaction check
 Transaction check succeeded.
Run transaction test
 Transaction test succeeded.
Operational transaction
  In preparation: 1 / 1 
  Installation: yum-utils-4.0.8-3.el8.noarch 1 / 1 
  Running script: yum-utils-4.0.8-3.el8.noarch 1 / 1 
  Validation: yum-utils-4.0.8-3.el8.noarch 1 / 1 

Installed:
  yum-utils-4.0.8-3.el8.noarch                                                                                                                

Complete!

2.3. View Docker version

[root@localhost ~]# yum list docker-ce --showduplicates | sort -r
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository PowerTools is listed more than once in the configuration
Repository AppStream is listed more than once in the configuration
Extra Packages for Enterprise Linux Modular 8 - 6.1 kB/s | 9.4 kB     00:01    
Extra Packages for Enterprise Linux 8 - x86_64  6.5 kB/s |  10 kB     00:01    
docker-ce.x86_64            3:19.03.5-3.el7                     docker-ce-stable
docker-ce.x86_64            3:19.03.4-3.el7                     docker-ce-stable
docker-ce.x86_64            3:19.03.3-3.el7                     docker-ce-stable
docker-ce.x86_64            3:19.03.2-3.el7                     docker-ce-stable
docker-ce.x86_64            3:19.03.1-3.el7                     docker-ce-stable
docker-ce.x86_64            3:19.03.0-3.el7                     docker-ce-stable
docker-ce.x86_64            3:18.09.9-3.el7                     docker-ce-stable
docker-ce.x86_64            3:18.09.8-3.el7                     docker-ce-stable
docker-ce.x86_64            3:18.09.7-3.el7                     docker-ce-stable
docker-ce.x86_64            3:18.09.6-3.el7                     docker-ce-stable
docker-ce.x86_64            3:18.09.5-3.el7                     docker-ce-stable
docker-ce.x86_64            3:18.09.4-3.el7                     docker-ce-stable
docker-ce.x86_64            3:18.09.3-3.el7                     docker-ce-stable
docker-ce.x86_64            3:18.09.2-3.el7                     docker-ce-stable
docker-ce.x86_64            3:18.09.1-3.el7                     docker-ce-stable
docker-ce.x86_64            3:18.09.0-3.el7                     docker-ce-stable
docker-ce.x86_64            18.06.3.ce-3.el7                    docker-ce-stable
docker-ce.x86_64            18.06.2.ce-3.el7                    docker-ce-stable
docker-ce.x86_64            18.06.1.ce-3.el7                    docker-ce-stable

2.4. Installing Docker

This is an installation error

[root@localhost ~]# yum install docker-ce
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository PowerTools is listed more than once in the configuration
Repository AppStream is listed more than once in the configuration
//Last metadata expiration check: before 0:00:38, it will be executed at 17:02:33 on Tuesday, January 28, 2020.
//Error:
 //Question: package docker-ce-3: 19.03.5-3.el7.x86_requirementscontained.io >= 1.2.2-3, but none of the providers can be installed
  - cannot install the best candidate for the job
  - package containerd.io-1.2.10-3.2.el7.x86_64 is excluded
  - package containerd.io-1.2.2-3.3.el7.x86_64 is excluded
  - package containerd.io-1.2.2-3.el7.x86_64 is excluded
  - package containerd.io-1.2.4-3.1.el7.x86_64 is excluded
  - package containerd.io-1.2.5-3.1.el7.x86_64 is excluded
  - package containerd.io-1.2.6-3.3.el7.x86_64 is excluded
(Try adding '--skip-broken' To skip packages that cannot be installed or '--nobest' To use more than the best choice of packages)

At this time, containerd.io needs to be installed. We can go to the website https://download.docker.com/linux/centos/7/x86_/stable/packages/ to find the latest one to install

[root@localhost ~]# dnf install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm

Continue with installation

[root@localhost ~]# yum install docker-ce docker-ce-cli

2.5. Start Docker and set it to start automatically

[root@localhost ~]# systemctl start docker
[root@localhost ~]# systemctl enable docker
Created symlink /etc/systemd/system/multi-user.target.wants/docker.service → /usr/lib/systemd/system/docker.service.

3, Docker compose installation

Because CentOS 8 has Python 3 and pip3 installed, you can install them directly. I can 't install docker-compose in Centos7 with pip2. I really feel deeply rooted!

[root@localhost ~]# pip3 -V
pip 9.0.3 from /usr/lib/python3.6/site-packages (python 3.6)
[root@localhost ~]# pip3 install docker-compose
[root@localhost ~]# docker-compose version
docker-compose version 1.25.3, build unknown
docker-py version: 4.1.0
CPython version: 3.6.8
OpenSSL version: OpenSSL 1.1.1c FIPS  28 May 2019
[root@localhost ~]# 

4, Modify Docker download source

Log in to alicloud: https://cr.console.aliyun.com/cn-hangzhou/mirrors. The last column is image accelerator. It will have its own image accelerator address.

Select Centos to execute:

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://xxxxx.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

Five, welcome to pay attention to the public number.