Docker CentOS7的系统上安装部署以及基础教程

说明：

本文介绍如何在centos7的系统上安装部署docker环境，本文参考docker官方文档如下链接：

https://docs.docker.com/engine/installation/centos/

centos7的系统上安装部署docker环境

1 centos7安装（略）

2 升级系统

yum update

升级完成后需要重启下系统。

3 添加docker yum源

执行如下命令：

cat >/etc/yum.repos.d/docker.repo
name=docker
repository baseurl=https://yum.dockerproject.org/repo/main/centos/7
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
eof

4 安装docker软件包

yum install docker-engine

5 启动docker服务

service docker start

6 测试运行下hello-world镜像

docker run hello-world

7 查看docker信息

使用docker info 命令可以参考系统、docker的详细信息：

docker info
containers: 3
images: 2
server version: 1.9.0
storage driver: devicemapper
pool name: docker-253:0-202597120-pool
pool blocksize: 65.54 kb
base device size: 107.4 gb
backing filesystem: xfs
data file: /dev/loop2
metadata file: /dev/loop3
data space used: 1.824 gb
data space total: 107.4 gb
data space available: 47.87 gb
metadata space used: 1.655 mb
metadata space total: 2.147 gb
metadata space available: 2.146 gb
udev sync supported: true
deferred removal enabled: false
deferred deletion enabled: false
deferred deleted device count: 0
data loop file: /var/lib/docker/devicemapper/devicemapper/data
metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
library version: 1.02.93-rhel7 (2015-01-28)
execution driver: native-0.2
logging driver: json-file
kernel version: 3.10.0-229.20.1.el7.x86_64
operating system: centos linux 7 (core)
cpus: 24
total memory: 11.57 gib
name: localhost.localdomain
id: viaj:mw46:fvfj:qn7g:xi66:oubo:m65b:kaue:bipc:ll5d:hbcl:762n

8 创建docker用户组，并将用户放到docker组内部

建议使用非root用户运行docker，因为root用户运行docker镜像非常不安全。

创建test1用户，并将用户加入到docker用户组：

[[email protected]~]# useradd test1
[[email protected]~]# usermod -ag docker test1

切到test1用户，运行docker镜像：

[[email protected]~]# su test1
[[email protected]]$
[[email protected]]$ docker run hello-world

9 设置dock服务开机启动

chkconfig docker on

10 卸载docker

yum list installed | grep docker
yum -y remove docker-engine.x86_64
rm -rf /var/lib/docker

然后删除相关用户。

补充说明：

关于docker的网络

和kvm类似，看起来也是使用网桥的方式：

[[email protected] ~]# ifconfig
docker0: flags=4163 mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 0.0.0.0
inet6 fe80::42:84ff:fe7f:4510 prefixlen 64 scopeid 0x20
ether 02:42:84:7f:45:10 txqueuelen 0 (ethernet)
rx packets 12 bytes 840 (840.0 b)
rx errors 0 dropped 0 overruns 0 frame 0
tx packets 3 bytes 258 (258.0 b)
tx errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 0 (local loopback)
rx packets 20530318 bytes 1812359321 (1.6 gib)
rx errors 0 dropped 0 overruns 0 frame 0
tx packets 20530318 bytes 1812359321 (1.6 gib)
tx errors 0 dropped 0 overruns 0 carrier 0 collisions 0
veth9422d62: flags=4163 mtu 1500
inet6 fe80::6c36:d0ff:fef5:3996 prefixlen 64 scopeid 0x20
ether 6e:36:d0:f5:39:96 txqueuelen 0 (ethernet)
rx packets 8 bytes 648 (648.0 b)
rx errors 0 dropped 0 overruns 0 frame 0
tx packets 10 bytes 828 (828.0 b)
tx errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[[email protected] ~]# brctl show
bridge name bridge id stp enabled interfaces
docker0 8000.0242847f4510 no veth9422d62
[[email protected] ~]#

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