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准备：
VMware Workstation Pro 15
CentOS-7-x86_64-Minimal-1810

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vi /etc/sysconfig/network-scripts/ifcfg-ens33

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# 设置 IP 地址为静态 IP
BOOTPROTO=static
# 随 network 服务启动
ONBOOT=yes
# 指定静态 IP
IPADDR=192.168.16.17
# 设置子网掩码
NETMASK=255.255.255.0
# 设置网关
GATEWAY=192.168.16.2
# 设置DNS
DNS1=192.168.16.2

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# 重启网络
systemctl restart network
# 查看 ip，查看 ens33 端口IP是否出现
ip a
# 测试网络环境
ping www.baidu.com

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# 保持系统最新版本
yum -y update && yum -y upgrade && yum -y autoremove

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前言：Linux 属于国外的系统，要想安装软件，通过系统自带的国外软件源，有的会感觉有些卡顿，所以有了国内软件源的出现。其中用的比较多的就是清华源、阿里源、中科大源等等，笔者最常用的就是清华源，当然了，下载一些 Linux 的镜像也会去下载，速度什么的还是不错的。

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# 备份原来的源
sudo mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
# 使用 vi ，创建一个新的文件
vi
/etc/yum.repos.d/CentOS-Base.repo

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# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.
You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-$releasever - Base
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/updates/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/extras/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/centosplus/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

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# 修改源系统版本
sudo sed -i `s/$releasever/7/g` /etc/yum.repos.d/CentOS-Base.repo
# 更新软件包缓存
sudo yum makecache

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# 备份系统源
sudo mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
# 下载新的源文件 Centos-Base.repo 到 /etc/yum.repo.d/ （这里只介绍 Centos7）
# 使用 wget ，首先要先安装，默认最小安装的系统不带 wget。
sudo yum -y install wget
# 下载阿里源文件
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
# 或者
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
# 修改源系统的版本
sudo sed -i `s$releasever/7/g` /etc/yum.repos.d/CentOS-Base.repo
# 生成缓存
sudo yum makecache