这期内容当中小编将会给大家带来有关Docker如何实现在线与离线安装，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

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在线安装

这里采用yum源命令安装前期准备的依赖包，包括yum-utils、device-mapper-persistent-data、lvm2

sudo yum install -y yum-utils device-mapper-persistent-data lvm2

因为官方镜像仓库网速较慢，在此设置阿里云镜像代理，以便快速下载、上传镜像。

sudo yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

接下来安装Docker-CE 社区版，通过以下命令查看docker社区版安装包列表。如下图所示各docker版本信息。

yum list docker-ce --showduplicates | sort -r

选择对应版本安装docker

sudo yum install docker-ce.x86_64

启动

sudo systemctl enable docker

sudo systemctl start docker

验证：查看版本信息命令，出现下图时表明安装成功。

docker version

离线安装

提供以下三种方式下载docker离线安装包

Docker官方地址：docker down

1.百度云下载地址：  https://pan.baidu.com/s/1tZpsOvY0wmCfwHXlNJuq8Q 提取码: rhaq

2.有网服务器执行命令下载：wget https://download.docker.com/linux/static/stable/x86_64/docker-18.09.6.tgz

3.官方参考文档：https://docs.docker.com/install/linux/docker-ce/binaries/#install-static-binaries

将已下载好的docker离线包拷贝到服务器，解压压缩包

tar -xvf docker-18.09.6.tgz

将解压出来的docker文件内容移动到 /usr/bin/ 目录下

cp docker/* /usr/bin/

注册编辑docker服务

vim /etc/systemd/system/docker.service

写入以下内容后保存

[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
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

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