centos7安装docker

一。修改yum源为阿里云的

    1. 进入yum目录

[root@localhost yum.repos.d]# ls
CentOS-Base.repo  CentOS-Debuginfo.repo  CentOS-Media.repo    CentOS-Vault.repo
CentOS-CR.repo    CentOS-fasttrack.repo  CentOS-Sources.repo
[root@localhost yum.repos.d]# 

    2. 备份

[root@localhost yum.repos.d]# mkdir back
[root@localhost yum.repos.d]# mv ./*.repo back/
[root@localhost yum.repos.d]# ls
back
[root@localhost yum.repos.d]# 

    3. 下载

[root@localhost yum.repos.d]# wget http://mirrors.aliyun.com/repo/Centos-7.repo
--2018-12-29 11:35:16--  http://mirrors.aliyun.com/repo/Centos-7.repo
正在解析主机 mirrors.aliyun.com (mirrors.aliyun.com)... 124.227.25.157, 124.227.25.149, 124.227.25.154, ...
正在连接 mirrors.aliyun.com (mirrors.aliyun.com)|124.227.25.157|:80... 已连接。
...

[root@localhost yum.repos.d]# wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
--2018-12-29 11:36:38--  https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
正在解析主机 mirrors.aliyun.com (mirrors.aliyun.com)... 124.227.25.152, 124.227.25.151, 124.227.25.156, ...
...

[root@localhost yum.repos.d]# ls
back  Centos-7.repo  docker-ce.repo
[root@localhost yum.repos.d]# 

    4. 更新源标识

[root@localhost yum.repos.d]# yum repolist
已加载插件：fastestmirror, langpacks
base                                                                                          | 3.6 kB  00:00:00     
docker-ce-stable                                                                              | 3.5 kB  00:00:00     
extras                                                                                        | 3.4 kB  00:00:00 
...

二。安装

    1.  在线标准安装

[root@localhost yum.repos.d]# yum install docker-ce
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
...

    2. 开机启动docker Daemon进程

[root@localhost yum.repos.d]# systemctl start docker.service
[root@localhost yum.repos.d]# systemctl enable docker.service
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
[root@localhost yum.repos.d]# 

    3. 查看版本

[root@localhost ~]# docker version
Client:
 Version:           18.09.0
 API version:       1.39
 Go version:        go1.10.4
 Git commit:        4d60db4
 Built:             Wed Nov  7 00:48:22 2018
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.0
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.4
  Git commit:       4d60db4
  Built:            Wed Nov  7 00:19:08 2018
  OS/Arch:          linux/amd64
  Experimental:     false
[root@localhost ~]# 

    4. 查看docker信息

[root@localhost ~]# docker info
Containers: 0
 Running: 0
 Paused: 0
 Stopped: 0
Images: 0
Server Version: 18.09.0
Storage Driver: overlay2
 Backing Filesystem: extfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: c4446665cb9c30056f4998ed953e6d4ff22c7c39
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: fec3683
Security Options:
 seccomp
  Profile: default
Kernel Version: 3.10.0-693.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 976.3MiB
Name: localhost.localdomain
ID: PFMV:N577:HBSK:XKEO:M6NY:QTAM:PILH:7EXQ:SGKA:AXNX:LDUW:JL2X
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false
Product License: Community Engine

     5. 开启阿里云镜像加速

        网易镜像：https://c.163.com/hub

        在阿里云获取加速地址，加入到 /etc/docker/daemon.json 文件中

{
  "registry-mirrors": ["https://registry.docker-cn.com"]
}

三。授予普通用户使用的权限

　　1. 查看是否有 docker 组，没有则创建

[root@localhost ~]# cat /etc/group | grep "docker"
docker:x:994:
[root@localhost ~]# 

　　2. 把用户 gh 加入到docker组中

[root@localhost ~]# usermod -G docker gh
[root@localhost ~]# 

　　3. 重新登陆即可

[gh@localhost ~]$ docker version
Client:
 Version:           18.09.0
 API version:       1.39
 Go version:        go1.10.4
 Git commit:        4d60db4
 Built:             Wed Nov  7 00:48:22 2018
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.0
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.4
  Git commit:       4d60db4
  Built:            Wed Nov  7 00:19:08 2018
  OS/Arch:          linux/amd64
  Experimental:     false
[gh@localhost ~]$ 

 四。配置文件

　　1. 默认配置文件： /etc/docker/daemon.json

　　2. 初始化配置文件： /usr/lib/systemd/system/docker.service

　　3. 容器配置文件： /etc/containerd/config.toml

官网文档 https://docs.docker.com/config/daemon/#force-a-stack-trace-to-be-logged