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centos7-linux安装docker(离线方式)
下载docker的安装文件
https://download.docker.com/linux/static/stable/x86_64/

下载的是：docker-18.06.3-ce.tgz 这个压缩文件

将docker-18.06.3-ce.tgz文件上传到centos7-linux系统上，用ftp工具上传即可

解压

[root@localhost java]# tar -zxvf docker-18.06.3-ce.tgz

将解压出来的docker文件复制到 /usr/bin/ 目录下

[root@localhost java]# cp docker/* /usr/bin/

进入/etc/systemd/system/目录,并创建docker.service文件

[root@localhost java]# cd /etc/systemd/system/
[root@localhost system]# touch docker.service

打开docker.service文件,将以下内容复制

[root@localhost system]# vi docker.service

注意： --insecure-registry=192.168.200.xxx 此处改为你自己服务器ip

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd --selinux-enabled=false --insecure-registry=192.168.200.xxx
ExecReload=/bin/kill -s HUP $MAINPID
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
# Uncomment TasksMax if your systemd version supports it.
# Only systemd 226 and above support this version.
#TasksMax=infinity
TimeoutStartSec=0
# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
# restart the docker process if it exits prematurely
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s[Install]
WantedBy=multi-user.target

给docker.service文件添加执行权限

[root@localhost system]# chmod 777 /etc/systemd/system/docker.service 

重新加载配置文件（每次有修改docker.service文件时都要重新加载下）

[root@localhost system]# systemctl daemon-reload 

启动

[root@localhost system]# systemctl start docker

设置开机启动

[root@localhost system]# systemctl enable docker.service

查看docker状态

[root@localhost system]# systemctl status docker

出现下面这个界面就代表docker安装成功。

配置镜像加速器,默认是到国外拉取镜像速度慢,可以配置国内的镜像如：阿里、网易等等。下面配置一下网易的镜像加速器。打开docker的配置文件: /etc/docker/daemon.json文件：

[root@localhost docker]# vi /etc/docker/daemon.json

配置如下:

{"registry-mirrors": ["http://hub-mirror.c.163.com"]}

配置完后:wq保存配置并重启docker 一定要重启不然加速是不会生效的！！！

[root@localhost docker]# service docker restart

参考：https://www.cnblogs.com/kingsonfu/p/11576797.html