云原生及kubernetes的基础一般是从Docker开始的，那在此之前如何搭建一套合适的Docker环境呢？需要软件包从哪里获取呢？本文将给你提供相关软件包及安装说明。

本文通过yum、rpm、二进制的方式安装并启动Docker服务，在生产环境中该方法也都适用。

本文例子使用的基础操作系统信息如下，当然也合适其他CentOS7/Redhat7发行版

[root@localhost docker-ce-18.09]# cat /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)
[root@localhost docker-ce-18.09]# uname  -a
Linux localhost.localdomain 3.10.0-862.el7.x86_64 #1 SMP Fri Apr 20 16:44:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

YUM方式安装

获取repo文件

curl  https://download.docker.com/linux/centos/docker-ce.repo > /etc/yum.repos.d/docker-ce.repo

安装docker

yum install docker-ce -y

RPM软件包安装

下载安装包

http://vinnyzhao.oss-cn-shanghai.aliyuncs.com/docker-ce-18.09.tar.gz

注：安装包内容为上步骤yum安装的软件包打包

解压并安装

tar xf docker-ce-18.09.tar.gz
cd docker-ce-18.09 
rpm -Uvh ./*  或者 yum localinstall ./* -y

二进制安装

下载文件

https://download.docker.com/linux/static/stable/x86_64/docker-18.09.5.tgz

解压复制安装

tar xf docker-18.09.5.tgz
cp docker/* /usr/bin/

创建service服务文件
编辑service文件/etc/systemd/system/docker.service
文件内容如下：

[Unit]
Description=Docker Application Container Engine
Documentation=https://download.docker.com/linux/static/stable/x86_64/docker-18.09.5.tgz

[Service]
Environment="PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/bin:/sbin"
ExecStart=/usr/bin/dockerd -p /var/run/docker.pid -s=overlay --live-restore --graph=/var/lib/docker --bip=172.17.0.1/16
ExecStartPost=/sbin/iptables -I FORWARD -s 0.0.0.0/0 -j ACCEPT
ExecReload=/bin/kill -s HUP $MAINPID
Restart=on-failure
RestartSec=5
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
Delegate=yes
KillMode=process

[Install]
WantedBy=multi-user.target

启动服务

systemctl enable docker
systemctl start docker

查看docker版本

 docker version
Client:
 Version:           18.09.5
 API version:       1.39
 Go version:        go1.10.8
 Git commit:        e8ff056
 Built:             Thu Apr 11 04:43:34 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.5
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.8
  Git commit:       e8ff056
  Built:            Thu Apr 11 04:13:40 2019
  OS/Arch:          linux/amd64
  Experimental:     false

配置Docker支持http的镜像仓库

cat /etc/docker/daemon.json
{ 
    "insecure-registries":["127.0.0.1:5000"],
    "log-driver": "json-file",
    "log-opts": {
        "max-size": "200m",
        "max-file": "3"
    }
 }

重载配置后重启

systemctl daemon-reload
systemctl restart docker