CentOS7.2下安装Docker并运行第一个容器

要求内核版本高于3.10的64位系统支持Docker
[root@localhost imagedb]# uname -a
Linux localhost.localdomain 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost imagedb]# more /etc/redhat-release 
CentOS Linux release 7.2.1511 (Core) 


使用yum安装Docker（保证主机能上网）
[root@localhost imagedb]#yum install docker


查看Docker已经安装
[root@localhost imagedb]#rpm -qa | grep docker
docker-client-1.12.6-55.gitc4618fb.el7.centos.x86_64
docker-1.12.6-55.gitc4618fb.el7.centos.x86_64
docker-common-1.12.6-55.gitc4618fb.el7.centos.x86_64


启动docker
[root@localhost imagedb]# systemctl start docker.service


查看docker版本
[root@localhost ~]# docker version
Client:
 Version:         1.12.6
 API version:     1.24
 Package version: docker-1.12.6-55.gitc4618fb.el7.centos.x86_64
 Go version:      go1.8.3
 Git commit:      c4618fb/1.12.6
 Built:           Thu Sep 21 22:33:52 2017
 OS/Arch:         linux/amd64

Server:
 Version:         1.12.6
 API version:     1.24
 Package version: docker-1.12.6-55.gitc4618fb.el7.centos.x86_64
 Go version:      go1.8.3
 Git commit:      c4618fb/1.12.6
 Built:           Thu Sep 21 22:33:52 2017
 OS/Arch:         linux/amd64


测试运行hello word
[root@localhost ~]# docker run hello-world
Unable to find image 'hello-world:latest' locally
Trying to pull repository docker.io/library/hello-world ... 
latest: Pulling from docker.io/library/hello-world
5b0f327be733: Pull complete 
Digest: sha256:1f19634d26995c320618d94e6f29c09c6589d5df3c063287a00e6de8458f8242

Hello from Docker!

This message shows that your installation appears to be working correctly.



下载并加载我们的第一个centos容器（下载时间很长）
[root@localhost ~]# docker run -i -t centos
Unable to find image 'centos:latest' locally
Trying to pull repository docker.io/library/centos ... 
latest: Pulling from docker.io/library/centos
d9aaf4d82f24: Pull complete 
Digest: sha256:eba772bac22c86d7d6e72421b4700c3f894ab6e35475a34014ff8de74c10872e
[root@3af0e01415a4 /]# 



查看使用第一个容器
[root@3af0e01415a4 /]# more /etc/redhat-release 
CentOS Linux release 7.4.1708 (Core) 
[root@3af0e01415a4 /]# hostname
3af0e01415a4
[root@3af0e01415a4 /]# more /etc/host
host.conf    hostname     hosts        hosts.allow  hosts.deny   
[root@3af0e01415a4 /]# more /etc/hosts
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.2 3af0e01415a4
[root@3af0e01415a4 /]# ping www.hao123.com
PING hao123.n.shifen.com (115.239.217.167) 56(84) bytes of data.
64 bytes from 115.239.217.167 (115.239.217.167): icmp_seq=1 ttl=127 time=76.3 ms
64 bytes from 115.239.217.167 (115.239.217.167): icmp_seq=2 ttl=127 time=47.2 ms
64 bytes from 115.239.217.167 (115.239.217.167): icmp_seq=3 ttl=127 time=47.9 ms
64 bytes from 115.239.217.167 (115.239.217.167): icmp_seq=4 ttl=127 time=47.2 ms
64 bytes from 115.239.217.167 (115.239.217.167): icmp_seq=5 ttl=127 time=47.9 ms


exit退出容器(退出容器后容器就停止工作)
[root@3af0e01415a4 /]# exit
exit
[root@localhost ~]# 


查看已经下载的镜像
[root@localhost ~]# docker images
REPOSITORY              TAG                 IMAGE ID            CREATED             SIZE
docker.io/centos        latest              196e0ce0c9fb        7 days ago          196.6 MB
docker.io/hello-world   latest              05a3bd381fc2        9 days ago          1.84 kB