安装新 CentOS，最先做的两件事：第一， 设置网络； 第二， 配置 yum 源

1. 虚拟机配置静态 IP

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1.1 VMware 和宿主机设置 IP

设置 VMware 虚拟网卡
1.2 设置宿主机网络
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1.3 设置虚拟机网络
配置静态网路

vim /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="static"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="ens33"
UUID="f2941bc2-d106-407f-8325-4e4aba5ae14f"
DEVICE="ens33"
ONBOOT="yes"
IPADDR=192.168.10.110
NETMASK=255.255.255.0
GATEWAY=192.168.10.1
DNS1=114.114.114.114

systemctl restart network

2. 切换 yum 源

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cd /etc/yum.repos.d
mv CentOS-Base.repo CentOS-Base.repo.bak

-- CentOs 7
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
或
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

-- CentOs 8
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
或 
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo

yum clean all
yum makecache
yum -y update

3. 同步时间

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ntpdate ntp.aliyun.com

其他链接：

1. [CentOS 8 结束生命周期如何切换源] : https://developer.aliyun.com/mirror/centos?spm=a2c4g.11186623.0.0.6b561f024k6qsk