CentOS6/7 docker安装

CentOS6/7 docker安装

官方网站：

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

https://github.com/docker/docker/tree/master/contrib/init/systemd

https://github.com/docker/docker/tree/release

http://www.docker.org.cn/book

环境:

CentOS6.5/7.1

docker-engine-1.11.2

一.docker官方yum源

cat >/etc/yum.repos.d/docker.repo <<'HERE'

[dockerrepo]

name=Docker Repository

baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/

enabled=1

gpgcheck=1

gpgkey=https://yum.dockerproject.org/gpg

HERE

或直接使用EPEL源

CentOS6:http://ftp.sjtu.edu.cn/fedora/epel/6/x86_64/

CentOS7:http://ftp.sjtu.edu.cn/fedora/epel/7/x86_64/

或者使用国内加速源(daocloud)安装

curl -sSL https://get.daocloud.io/docker | sh

二.安装docker

yum -y install docker-engine

提示:可能早期的包名叫docker-io(CentOS6),docker(CentOS7),同时docker-engine依赖libdevmapper.so.1.02,所以也需要CentOS官方base源

三.启动docker

service docker start

开机自启动

chkconfig docker on #CentOS6

systemctl enable docker #CentOS7

注意:CentOS6.5启动docker(docker -d)报错

INFO[0000] +job serveapi(unix:///var/run/docker.sock)  

INFO[0000] WARNING: You are running linux kernel version 2.6.32-431.el6.x86_64, which might be unstable running docker. 

Please upgrade your kernel to 3.8.0.

docker: relocation error: docker: symbol dm_task_get_info_with_deferred_remove, version Base not defined in file libdevmapper.so.1.02 with link time reference

表面上是说内核版本过低，实际上是device-mapper库版本过低

解决办法：

yum upgrade device-mapper-libs

CentOS官方base源中有提供device-mapper-libs

四.测试

查看版本

docker version

[root@ct7 ~]# docker version

Client:

 Version:      1.11.2

 API version:  1.23

 Go version:   go1.5.4

 Git commit:   b9f10c9

 Built:        Wed Jun  1 21:23:11 2016

 OS/Arch:      linux/amd64

Server:

 Version:      1.11.2

 API version:  1.23

 Go version:   go1.5.4

 Git commit:   b9f10c9

 Built:        Wed Jun  1 21:23:11 2016

 OS/Arch:      linux/amd64

测试工作是否正常，获取最新的centos镜像

docker pull centos:latest

root@router:~#docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

ubuntu              14.04               c697c2cf93f2        3 minutes ago       215.4 MB

centos              7                   a5d24a28dd56        5 minutes ago       434.8 MB

运行简单的bash shell来测试这个镜像

docker run -i -t centos /bin/bash

如果正常，会获得一个简单的bash提示，输入exit退出

查看IP

ip a

docker rmi -f 2fa927b5cdd3 #删除镜像