centos7下安装docker

         docker技术发展速度很快,从15年接触docker到现在已经两年了,两年来docker变化很大,百度一下也会发现一大片的技术博客,关于技术书籍出版的也不少,但很多书都是出版就意味着过时.

        新技术层出不穷,在学完k8s之后,回过头来总结下docker和k8s,以备后用.

       所用系统:centos 7

      在安装之前我们需要介绍下环境:

    1.  网络使用的是dhcp,可以ping通百度

[root@xinsz08 ~]# ping www.baidu.com
    PING www.a.shifen.com (119.75.213.61) 56(84) bytes of data.
    64 bytes from 119.75.213.61: icmp_seq=1 ttl=56 time=5.48 ms
    64 bytes from 119.75.213.61: icmp_seq=2 ttl=56 time=7.26 ms
    64 bytes from 119.75.213.61: icmp_seq=3 ttl=56 time=5.55 ms

     --- www.a.shifen.com ping statistics ---
     3 packets transmitted, 3 received, 0% packet loss, time 2003ms
    rtt min/avg/max/mdev = 5.486/6.102/7.266/0.823 ms

     2.防火墙是开启的

[root@xinsz08 ~]# systemctl  status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: active (running) since 日 2017-09-24 09:52:02 CST; 2 days ago
 Main PID: 926 (firewalld)
   CGroup: /system.slice/firewalld.service
           └─926 /usr/bin/python -Es /usr/sbin/firewalld --nofork ...

9月 24 09:52:03 xinsz08 systemd[1]: Starting firewalld - dynamic....
9月 24 09:52:02 xinsz08 systemd[1]: Started firewalld - dynamic ....
Hint: Some lines were ellipsized, use -l to show in full.

  3. selinux是开启的

[root@xinsz08 ~]# getenforce

    接下来我们开始安装docker: 

1.安装所需要的包

Install required packages. yum-utils provides the yum-config-managerutility, and device-mapper-persistent-data and lvm2 are required by thedevicemapper storage driver.


 # yum install -y yum-utils \
 device-mapper-persistent-data \
 lvm2

 yum-utils :

功能:管理repository 及扩展包工具
device-mapper-persistent-data 设备映射持久化数据的存储

2. 使用下列命令建立稳定的库
$ sudo yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo


1)安装docker
$ sudo yum install docker-ce


2) 启动docker

systemctl start docker

3)  测试
  docker run hello-world

4.查看docker版本