Docker 是一个开源的应用容器引擎，让开发者可以打包他们的应用以及依赖包到一个可移植的容器中，然后发布到任何流行的 Linux 机器上，也可以实现虚拟化。容器是完全使用沙箱机制，相互之间不会有任何接口。 一个完整的Docker有以下几个部分组成： DockerClient客户端 Docker Daemon守护进程 Docker Image镜像 DockerContainer容器 [2]
1.yum 包更新到最新
sudo yum update
2.安装需要的软件包， yum-util 提供yum-config-manager功能，另外两个是devicemapper驱动依赖的
sudo yum install -y yum-utils device-mapper-persistent-data lvm2 3. 设置yum源为阿里云 （目的：下载快）
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
4.安装docker
yum install -y docker-io
报错：
解决办法（升级内核）： 因为我的centos没有装ssl，先装一个ssl,有的就不需要了
yum -y install curl nss openssl
导入公钥数字证书 rpm --import www.elrepo.org/RPM-GPG-KEY… 安装ELRepo rpm -Uvh www.elrepo.org/elrepo-rele… centos没有glibc的话安装下glbc:
yum -y install glibc 安装kernel-lt（lt=long-term 长期维护版本，也可以将kernel-lt改为kernel-ml，安装主线版本) yum --enablerepo=elrepo-kernel install kernel-lt -y
vim /etc/grub.conf
一定保存！！！
参看一下
重启系统 .vim /etc/selinux/config（禁用selinux，因为selinux和LXC有冲突）
# 以下是/etc/selinux/config的内容
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled # 将SELINUX设为disabled，注意修改后最好重启下机器。
重启系统 安装 Fedora EPEL yum -y install dl.fedoraproject.org/pub/epel/6/…
查看内核 uname -r
yum install -y docker-io 报错：
yum install https://get.docker.com/rpm/1.7.1/centos-6/RPMS/x86_64/docker-engine-1.7.1-1.el6.x86_64.rpm
[root@localhost ~]# yum install https://get.docker.com/rpm/1.7.1/centos-6/RPMS/x86_64/docker-engine-1.7.1-1.el6.x86_64.rpm
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* extras: mirrors.skyshe.cn
* updates: centosx4.centos.org
Setting up Install Process
docker-engine-1.7.1-1.el6.x86_64.rpm | 4.5 MB 00:07
Examining /var/tmp/yum-root-YSfgzS/docker-engine-1.7.1-1.el6.x86_64.rpm: docker-engine-1.7.1-1.el6.x86_64
Marking /var/tmp/yum-root-YSfgzS/docker-engine-1.7.1-1.el6.x86_64.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package docker-engine.x86_64 0:1.7.1-1.el6 will be installed
--> Processing Dependency: libcgroup for package: docker-engine-1.7.1-1.el6.x86_64
--> Running transaction check
---> Package libcgroup.x86_64 0:0.40.rc1-16.el6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
============================================================================================================================================================
Package Arch Version Repository Size
============================================================================================================================================================
Installing:
docker-engine x86_64 1.7.1-1.el6 /docker-engine-1.7.1-1.el6.x86_64 19 M
Installing for dependencies:
libcgroup x86_64 0.40.rc1-16.el6 base 129 k
Transaction Summary
============================================================================================================================================================
Install 2 Package(s)
Total size: 19 M
Total download size: 129 k
Installed size: 20 M
Is this ok [y/N]: y
Downloading Packages:
libcgroup-0.40.rc1-16.el6.x86_64.rpm | 129 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : libcgroup-0.40.rc1-16.el6.x86_64 1/2
Installing : docker-engine-1.7.1-1.el6.x86_64 2/2
Verifying : libcgroup-0.40.rc1-16.el6.x86_64 1/2
Verifying : docker-engine-1.7.1-1.el6.x86_64 2/2
Installed:
docker-engine.x86_64 0:1.7.1-1.el6
Dependency Installed:
libcgroup.x86_64 0:0.40.rc1-16.el6
Complete!
[root@localhost ~]# service docker start
Starting cgconfig service: [ OK ]
Starting docker: [ OK ]
6.启动docker
docker -d 不报错证明启动成功！！
报错：
解决办法如下：
vi /etc/fstab 在最后增加none /sys/fs/cgroup cgroup defaults 0 0
然后按esc ：wq保存，接着重启系统（reboot）
7.重启后，安装device-mapper*
yum -y install device-mapper*
8.查看docker版本
docker -v
