1、个人安装环境
1.1 CentOS Linux release 7.7.1908 (Core)
2、更改目的
有时候CentOS默认的yum源不一定是国内镜像，导致yum在线安装及更新速度不是很理想。这时候需要将yum源设置为国内镜像站点。
国内主要开源的开源镜像站点应该是网易和阿里云了。具体使用哪个可以根据PING命令获取time，选择time较小源
[root@localhost yum.repos.d]# ping 163.com PING 63.com (127.0.0.1) 56(84) bytes of data. 64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.099 ms 64 bytes from localhost (127.0.0.1): icmp_seq=2 ttl=64 time=0.097 ms 64 bytes from localhost (127.0.0.1): icmp_seq=3 ttl=64 time=0.101 ms
[root@localhost yum.repos.d]# ping aliyun.com PING aliyun.com (106.11.172.51) 56(84) bytes of data. 64 bytes from 106.11.172.51 (106.11.172.51): icmp_seq=1 ttl=128 time=17.7 ms 64 bytes from 106.11.172.51 (106.11.172.51): icmp_seq=2 ttl=128 time=17.4 ms 64 bytes from 106.11.172.51 (106.11.172.51): icmp_seq=3 ttl=128 time=15.6 ms
3、安装步骤
3.1 备份源文件
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
3.2 下载更改源
- CentOS5
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
- CentOS6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
- CentOS7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
根据centos版本下载对应的新源，这里以CentOS7为例
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
如果wget命令不生效，说明还没有安装wget工具，输入yum -y install wget 回车进行安装，或者使用
curl -O http://mirrors.aliyun.com/repo/Centos-7.repo
3.3 清空yum缓存并生存cache文件
yum clean all yum makecache
3.4 尝试更新系统
yum -y update