ls -l /etc/yum.repos.d/
查看原来的源
total 48
-rw-r--r-- 1 root root 719 Nov 10 2020 CentOS-Linux-AppStream.repo
-rw-r--r-- 1 root root 704 Nov 10 2020 CentOS-Linux-BaseOS.repo
-rw-r--r-- 1 root root 1130 Nov 10 2020 CentOS-Linux-ContinuousRelease.repo
-rw-r--r-- 1 root root 318 Nov 10 2020 CentOS-Linux-Debuginfo.repo
-rw-r--r-- 1 root root 732 Nov 10 2020 CentOS-Linux-Devel.repo
-rw-r--r-- 1 root root 704 Nov 10 2020 CentOS-Linux-Extras.repo
-rw-r--r-- 1 root root 719 Nov 10 2020 CentOS-Linux-FastTrack.repo
-rw-r--r-- 1 root root 740 Nov 10 2020 CentOS-Linux-HighAvailability.repo
-rw-r--r-- 1 root root 693 Nov 10 2020 CentOS-Linux-Media.repo
-rw-r--r-- 1 root root 706 Nov 10 2020 CentOS-Linux-Plus.repo
-rw-r--r-- 1 root root 724 Nov 10 2020 CentOS-Linux-PowerTools.repo
-rw-r--r-- 1 root root 898 Nov 10 2020 CentOS-Linux-Sources.repo
默认Yum源备份
mkdir /opt/centos-yum.bak
mv /etc/yum.repos.d/* /opt/centos-yum.bak/
下载ailiyun的yum源配置文件到/etc/yum.repos.d/
CentOS8
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-8.repo
非阿里云机器需要 替换部分字段
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
CentOS7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
CentOS6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
CentOS5
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
清除缓存
yum clean all
运行yum makecache生成缓存
yum makecache
yum -y update
升级所有包同时也升级软件和系统内核
yum -y upgrade
只升级所有包，不升级软件和系统内核
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