CentOS 6 安装 Docker

安装 EPEL

两种方式

直接安装：

yum install epel-release

还能够替换清华源

经过连接安装：

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm

可查看官方说明

更新下依赖软件

sudo yum update -y

安装 Docker

添加用户组

添加一个 docker 组

groupadd docker

将使用 docker 的用户添加进组里

useradd docker -g docker

将当期用户添加进组

sudo usermod -aG docker $USER

安装 Docker

CentOS7 以上系统，可经过 curl -sSL https://get.docker.com/ | sh 直接指向安装脚本，这里是用 yum 安装。

sudo yum -y install docker-io

执行 docker version 检查是否安装成功：

Client version: 1.7.1
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 786b29d/1.7.1
OS/Arch (client): linux/amd64
Get http:///var/run/docker.sock/v1.19/version: dial unix /var/run/docker.sock: no such file or directory. Are you trying to connect to a TLS-enabled daemon without TLS?

此时还没有启动 Docker Server 因此最后有提示。

镜像加速

目前国内已有几个成熟的镜像加速，这里以 DockerCn 为例:

CentOS6 经过编辑 /etc/sysconfig/docker 文件的 other_args 参数实现镜像加速。

# /etc/sysconfig/docker
#
# Other arguments to pass to the docker daemon process
# These will be parsed by the sysv initscript and appended
# to the arguments list passed to docker -d

other_args="--registry-mirror=https://registry.docker-cn.com"
DOCKER_CERT_PATH=/etc/docker

# Resolves: rhbz#1176302 (docker issue #407)
DOCKER_NOWARN_KERNEL_VERSION=1

# Location used for temporary files, such as those created by
# # docker load and build operations. Default is /var/lib/docker/tmp
# # Can be overriden by setting the following environment variable.
# # DOCKER_TMPDIR=/var/tmp

此示例仅适用于 CentOS6，若是已经启动服务，须要重启服务 service docker restart。

Docker 中国官方镜像加速

启动服务

启动 Docker 服务

service docker start

另附上中止和重启服务

service docker stop
service docker restart

检查安装

执行 docker version

Client version: 1.7.1
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 786b29d/1.7.1
OS/Arch (client): linux/amd64
Server version: 1.7.1
Server API version: 1.19
Go version (server): go1.4.2
# /etc/sysconfig/docker
Git commit (server): 786b29d/1.7.1
OS/Arch (server): linux/amd64

执行 docker info

Containers: 0
Images: 0
Storage Driver: devicemapper
 Pool Name: docker-202:2-1172437-pool
 Pool Blocksize: 65.54 kB
 Backing Filesystem: extfs
 Data file: /dev/loop0
 Metadata file: /dev/loop1
 Data Space Used: 305.7 MB
 Data Space Total: 107.4 GB
 Data Space Available: 34.62 GB
 Metadata Space Used: 733.2 kB
 Metadata Space Total: 2.147 GB
 Metadata Space Available: 2.147 GB
 Udev Sync Supported: true
 Deferred Removal Enabled: false
 Data loop file: /var/lib/docker/devicemapper/devicemapper/data
 Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
 Library Version: 1.02.117-RHEL6 (2016-12-13)
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 2.6.32-358.el6.x86_64
Operating System: <unknown>
CPUs: 8
Total Memory: 15.55 GiB
Name: ecs-634b-0002
ID: IMEI:V37Q:FO5S:3GYL:X2UH:2ECU:V4RW:---------------------------

至此，安装完成！