1、個人安裝環境
1.1 CentOS Linux release 7.7.1908 (Core)
2、更改目的
有時候CentOS默認的yum源不一定是國內鏡像，導致yum在線安裝及更新速度不是很理想。這時候需要將yum源設置為國內鏡像站點。
國內主要開源的開源鏡像站點應該是網易和阿里雲了。具體使用哪個可以根據PING命令獲取time，選擇time較小源
[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、安裝步驟
3.1 備份源文件
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
3.2 下載更改源
- 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
根據centos版本下載對應的新源，這里以CentOS7為例
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，說明還沒有安裝wget工具，輸入yum -y install wget 回車進行安裝，或者使用
curl -O http://mirrors.aliyun.com/repo/Centos-7.repo
3.3 清空yum緩存並生存cache文件
yum clean all yum makecache
3.4 嘗試更新系統
yum -y update