当前位置 博文首页 > 小小之食人魔：Linux:Centos 7yum源文件详解
CentOS 7上提供了一些yum源文件。如下:
CentOS-Base.repo
CentOS-CR.repo
CentOS-Debuginfo.repo
CentOS-fasttrack.repo
CentOS-Media.repo
CentOS-Sources.repo
CentOS-Vault.repo
不过只有CentOS-Base.repo是默认开启的，其余的都没用到。看一下这个yum源中有多少软件包。
[root@MiWiFi-R4A-srv ~]# yum repolist
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* centosplus: mirrors.163.com
* extras: mirrors.163.com
* updates: mirrors.163.com
repo id repo name status
base/7/x86_64 CentOS-7 - Base 10,097
centosplus/7/x86_64 CentOS-7 - Plus 80
extras/7/x86_64 CentOS-7 - Extras 335
updates/7/x86_64 CentOS-7 - Updates 1,487
repolist: 11,999
#可以看到共有11999个包，而且是来自国内163网易的镜像源。
接着我们打开CentOS-Base.repo内容如下：
[root@MiWiFi-R4A-srv ~]# cat /etc/yum.repos.d/CentOS-Base.repo
# CentOS-Base.repo
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
# 如果mirrorlist=对您不起作用，作为回退，您可以改为尝试注释掉的baseurl=行。
##如果你的yum源不能用，你就切换为baseurl作为源地址，把原来的mirrorlist行注释掉。
##这里面一共写了四个软件仓库。
[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
这个链接就等同于"http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=$infra"
$releaseserver = 本机的系统版本
[root@MiWiFi-R4A-srv ~]# rpm -qi centos-release
Name : centos-release
Version : 7
Release : 7.1908.0.el7.centos #系统版本
Architecture: x86_64
Install Date: Sat 14 Mar 2020 05:38:18 AM EDT
Group : System Environment/Base
Size : 42295
License : GPLv2
Signature : RSA/SHA256, Thu 05 Sep 2019 09:19:24 AM EDT, Key ID 24c6a8a7f4a80eb5
Source RPM : centos-release-7-7.1908.0.el7.centos.src.rpm
Build Date : Thu 05 Sep 2019 09:05:40 AM EDT
Build Host : x86-01.bsys.centos.org
Relocations : (not relocatable)
Packager : CentOS BuildSystem <http://bugs.centos.org>
Vendor : CentOS
Summary : CentOS Linux release file
Description :
CentOS Linux release files
#$arch = 本机CPU架构
[root@MiWiFi-R4A-srv ~]# arch
x86_64
链接里面是一组yum源地址，系统会自动的选择最快的。
[root@MiWiFi-R4A-srv ~]# curl 'http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=$infra'
http://mirror.bit.edu.cn/centos/7.7.1908/os/x86_64/
http://mirrors.nju.edu.cn/centos/7.7.1908/os/x86_64/
http://mirrors.aliyun.com/centos/7.7.1908/os/x86_64/
http://mirrors.cn99.com/centos/7.7.1908/os/x86_64/
http://mirrors.zju.edu.cn/centos/7.7.1908/os/x86_64/
http://ftp.sjtu.edu.cn/centos/7.7.1908/os/x86_64/
http://mirrors.163.com/centos/7.7.1908/os/x86_64/
http://mirrors.neusoft.edu.cn/centos/7.7.1908/os/x86_64/
http://mirrors.cqu.edu.cn/CentOS/7.7.1908/os/x86_64/
http://mirrors.tuna.tsinghua.edu.cn/centos/7.7.1908/os/x86_64/
