Docker之安装

Docker之安装

• 环境：Centos6.5，Centos7

  前言

  1、EPEL（ Extra Packages for Enterprise Linux，企业版Linux的额外软件包)是yum的一个软件源，里面包含了许多基本源里没有的软件；
  2、docker要求服务CentOS6以上，kernel 版本必须2.6.32-431或更高；

  查看系统的版本和内核

  ## 查看系统版本
  $ lsb_release -a
  ## 查看内核版本
  $ uname -r

Centos6.5安装docker

要将Docker安装到CentOS上，要使用EPEL软件库，下载epel安装包并安装

$ wget http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm
$ rpm -ivh epel-release-6-8.noarch.rpm

检查EPEL源

$yum repolist
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.skyshe.cn
 * epel: mirrors.opencas.cn
 * extras: mirrors.skyshe.cn
 * updates: centos.ustc.edu.cn
repo id                                                                                    repo name                                                                                                                          status
base                                                                                       CentOS-6 - Base                                                                                                                     6,575
epel                                                                                       Extra Packages for Enterprise Linux 6 - x86_64                                                                                     12,234
extras                                                                                     CentOS-6 - Extras                                                                                                                      62
updates                                                                                    CentOS-6 - Updates                                                                                                                  1,580
repolist: 20,451
EPEL已经在repo列出，并显示提供12234个软件包，EPEL源的配置安装到了/etc/yum.repos.d/epel.repo

安装

$ yum install -y docker-io
$ service docker start
$ chkconfig docker on

检查docker是否安装成功

$docker info
Containers: 0
Images: 0
Storage Driver: devicemapper
 Pool Name: docker-8:3-276002-pool
 Pool Blocksize: 65.54 kB
 Backing Filesystem: extfs
 Data file: /dev/loop0
 Metadata file: /dev/loop1
 Data Space Used: 305.7 MB
 Data Space Total: 107.4 GB
 Data Space Available: 4.873 GB
 Metadata Space Used: 729.1 kB
 Metadata Space Total: 2.147 GB
 Metadata Space Available: 2.147 GB
 Udev Sync Supported: true
 Deferred Removal Enabled: false
 Data loop file: /var/lib/docker/devicemapper/devicemapper/data
 Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
 Library Version: 1.02.95-RHEL6 (2015-09-08)
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 2.6.32-431.el6.x86_64
Operating System: <unknown>
CPUs: 1
Total Memory: 996.4 MiB
Name: winter-01
ID: KJ3G:XD6V:SDDV:5SGY:2TRQ:4XXR:XBPV:VLHE:XHHZ:F425:7G2B:G5D5

Centos7安装docker

centos7可以直接使用yum安装，不需要再添加其他软件源信息.

安装

$ yum install -y docker

添加镜像源

使用daocloud的镜像加速器，在https://www.daocloud.io上注册账号，选择加速器

正常情况下，直接执行上图的命令即可，但为了安全起见，执行后，查看/etc/docker/daemon.json，是否格式正确。

$ vim /etc/docker/daemon.json
{
    "registry-mirrors": [
        "http://5c00508c.m.daocloud.io"
    ],
    "insecure-registries": []
}

验证

## 启动
$ service docker start
## 配置开机启动
$ chkconfig docker on
## 下载镜像测试
## docker pull hello-world

Q&A：

Centos6.5安装好epel后，执行命令yum repolist报错，信息如下：

$ yum repolist
Loaded plugins: product-id, security, subscription-manager
Updating certificate-based repositories.
Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again

解决办法：vim /etc/yum.repos.d/epel.repo
编辑[epel]下的baseurl前的#号去掉，mirrorlist前添加#号。正确配置如下：

[epel]
name=Extra Packages for Enterprise Linux 6 - $basearch
baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

执行

$yum makecache

参考

• https://www.jianshu.com/p/3a4cd73e3272 CentOS7安装Docker
• https://blog.csdn.net/Mr_OOO/article/details/67016309 Docker国内镜像源设置