1-Docker安装

1.准备环境

1.第一步：创建以自己的姓名全拼的用户名

[root@hadoop ~]# useradd qiwenyong
[root@hadoop ~]# passwd qiwenyong
Changing password for user qiwenyong.
New password: 
BAD PASSWORD: The password is shorter than 7 characters
Retype new password: 
passwd: all authentication tokens updated successfully.

第二步：将qiwenyong配置到sudoers

[root@hadoop ~]# chmod u+w /etc/sudoers
[root@hadoop ~]# vi /etc/sudoers
## Allow root to run any commands anywhere
root    ALL=(ALL)       ALL
hadoop  ALL=(ALL)       ALL
qiwenyong       ALL=(ALL)       ALL

第三步：关闭防火墙

[root@hadoop ~]# firewall-cmd --state
running
[root@hadoop ~]# systemctl stop firewalld.service
[root@hadoop ~]# systemctl disable firewalld.service
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
[root@hadoop ~]# firewall-cmd --state
not running

第四步：解决Cannot find a valid baseurl for repo: base/7/x86_64错误。修改YUM源配置（有些版本无需设置）

#1.备份现有的YUM配置文件
[root@hadoop ~]# cp -r /etc/yum.repos.d/ /etc/yum.repos.d.backup
#2.编辑或替换仓库配置文件(注意目录)
[root@hadoop yum.repos.d]# vi CentOS-Base.repo 
[base]
name=CentOS-$releasever - Base
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7[updates]
name=CentOS-$releasever - Updates
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7[extras]
name=CentOS-$releasever - Extras
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
# 3.清理并重建缓存
[root@hadoop yum.repos.d]#  yum clean all
[root@hadoop yum.repos.d]#  yum makecache
[root@hadoop yum.repos.d]#  yum update

第五步：安装vim（非必要）

[root@hadoop yum.repos.d]# yum install -y vim

2.安装Docker

注意切换了用户

第一步：配置国内镜像源

[qiwenyong@hadoop ~]$ sudo mkdir /etc/docker
[qiwenyong@hadoop ~]$ sudo vim /etc/docker/daemon.json
{"registry-mirrors": ["https://docker.1panelproxy.com","https://2a6bf1988cb6428c877f723ec7530dbc.mirror.swr.myhuaweicloud.com","https://docker.m.daocloud.io","https://hub-mirror.c.163.com","https://mirror.baidubce.com","https://your_preferred_mirror","https://dockerhub.icu","https://docker.registry.cyou","https://docker-cf.registry.cyou","https://dockercf.jsdelivr.fyi","https://docker.jsdelivr.fyi","https://dockertest.jsdelivr.fyi","https://mirror.aliyuncs.com","https://dockerproxy.com","https://mirror.baidubce.com","https://docker.m.daocloud.io","https://docker.nju.edu.cn","https://docker.mirrors.sjtug.sjtu.edu.cn","https://docker.mirrors.ustc.edu.cn","https://mirror.iscas.ac.cn","https://docker.rainbond.cc"]
}

第二部：安装一些必要的包，这些包是安装Docker的前提条件

[qiwenyong@hadoop ~]$ sudo yum install -y yum-utils

第三步：为了方便安装和管理Docker，添加Docker的官方仓库

[qiwenyong@hadoop ~]$ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

第四步：安装Docker CE

[qiwenyong@hadoop ~]$ sudo yum install -y docker-ce docker-ce-cli containerd.io

安装过程中出现如下是直接输入y即可,

注意安装过程中有可能失败，多次执行即可，或者配置国内其他镜像（不知为何，阿里的老失败）

第五步：安装完成后通过如下命令启动Docker

[qiwenyong@hadoop ~]$ sudo systemctl start docker

第六步：验证Docker安装是否成功

[qiwenyong@hadoop ~]$ sudo systemctl start docker

运行成功后能看到Hello from Docker!字眼，说明成功安装

3.其他配置

1）设置Docker在系统启动时自动启动

为了确保每次开机时Docker都能自动启动，你可以设置它为开机自启:

[qiwenyong@hadoop ~]$ sudo systemctl enable docker

2)配置Docker用户组（避免使用sudo）

[qiwenyong@hadoop ~]$ sudo usermod -aG docker qiwenyong
[qiwenyong@hadoop ~]$ newgrp docker # 或者注销并重新登录以应用更改