Docker安装指引

安装前准备

1. 准备一台linux主机， 本安装指引以腾讯云上的虚拟机为例；
2. 建议操作系统为centos7.2.建议内核版本为3.10.517以上；
3. 网络可通外网，需远程下载安装软件； 以下安装配置操作均在root用户下执行。

安装步骤

1. 下载二进制包到本地

   mkdir  /data/
   cd /data
   wget https://download.docker.com/linux/static/stable/x86_64/docker-18.06.3-ce.tgz

2. 解压二进制包

   tar xzvf docker-18.06.3-ce.tgz
   mv docker/* /usr/bin

3. 创建/etc/docker目录，创建配置文件/etc/docker/daemon.json，将下列内容拷贝到文件中

   {
     "bip": "169.254.32.1/28",
     "bridge": "",
     "debug": false,
     "default-runtime": "runc",
     "exec-opts": [],
     "exec-root": "",
     "graph": "/var/lib/docker",
     "group": "",
     "insecure-registries": [],
     "ip-forward": true,
     "ip-masq": true,
     "iptables": true,
     "ipv6": false,
     "labels": [],
     "live-restore": true,
     "log-driver": "json-file",
     "log-level": "warn",
     "log-opts": {
       "max-file": "10",
       "max-size": "100m"
     },
     "registry-mirrors": [
       "https://mirror.ccs.tencentyun.com"
     ],
     "runtimes": {},
     "selinux-enabled": false,
     "storage-driver": "overlay2",
     "storage-opts": [
       "overlay2.override_kernel_check=true"
     ]
   }
   

4. 创建docker服务文件/lib/systemd/system/dockerd.service，将下列内容拷贝到文件中

   [Unit]
   Description=dockerd
   
   [Service]
   Environment=QCLOUD_NORM_URL=
   Type=notify
   ExecStart=/usr/bin/dockerd --config-file=/etc/docker/daemon.json
   ExecStartPre=/bin/rm -f /var/run/docker.pid
   ExecStartPost=-/sbin/iptables -I FORWARD -s 0.0.0.0/0 -j ACCEPT
   ExecReload=/bin/kill -s HUP $MAINPID
   LimitNOFILE=1048576
   LimitNPROC=1048576
   LimitCORE=infinity
   TimeoutStartSec=0
   Delegate=yes
   KillMode=process
   Restart=always
   RestartSec=10
   
   [Install]
   WantedBy=multi-user.target

5. 创建服务并启动

   systemctl enable dockerd
   systemctl start  dockerd

6. 运行命令确认docker安装成功

   docker --version

   

设置内核参数

1. 编辑内核参数文件/etc/sysctl.conf,确认这几个选项如下：

   net.ipv4.ip_forward=1
   net.bridge.bridge-nf-call-ip6tables = 1
   net.bridge.bridge-nf-call-iptables = 1

2. 执行命令

   sysctl -p