在安装xen虚拟化的时候因为自己电脑网络的问题，下载一些yum源的RPM包甚是烦恼，于是狠心搭建一个本地的yum源。速度极好。支持自动同步互联网上主流仓库。
下面说说具体步骤。
1 同步互联网上的部分仓库，搭建yum源服务端
我主要用到的是centos的6和7版本的部分仓库目录，主要是os updates extras 和 virt ，其中virt是专门搞虚拟化的。
搭建NGINX服务器，用作一个下载服务器，传送门 https://peloo.net/?p=444
创建本地目录，我是在树莓派上挂载一个1T的移动硬盘提供存储服务，建立的目录如下，
pi@raspberrypi:/media/pi/Seagate_disk $ mkdir -p /media/pi/Seagate_disk/repo/centos/7/{os,extras,updates,virt}
pi@raspberrypi:/media/pi/Seagate_disk $ mkdir -p /media/pi/Seagate_disk/repo/centos/6/{os,extras,updates,virt}
pi@raspberrypi:/media/pi/Seagate_disk $ mkdir -p /media/pi/Seagate_disk/repo/centos/7/os/x86_64/
pi@raspberrypi:/media/pi/Seagate_disk $ mkdir -p /media/pi/Seagate_disk/repo/centos/7/extras/x86_64/
pi@raspberrypi:/media/pi/Seagate_disk $ mkdir -p /media/pi/Seagate_disk/repo/centos/7/updates/x86_64/
pi@raspberrypi:/media/pi/Seagate_disk $ mkdir -p /media/pi/Seagate_disk/repo/centos/7/virt/x86_64/
pi@raspberrypi:/media/pi/Seagate_disk $ mkdir -p /media/pi/Seagate_disk/repo/centos/6/os/x86_64/
pi@raspberrypi:/media/pi/Seagate_disk $ mkdir -p /media/pi/Seagate_disk/repo/centos/6/extras/x86_64/
pi@raspberrypi:/media/pi/Seagate_disk $ mkdir -p /media/pi/Seagate_disk/repo/centos/6/updates/x86_64/
pi@raspberrypi:/media/pi/Seagate_disk $ mkdir -p /media/pi/Seagate_disk/repo/centos/6/virt/x86_64/
接着联网同步仓库，
/usr/bin/rsync -av rsync://mirrors.ustc.edu.cn/centos/7/os/x86_64/ /media/pi/Seagate_disk/repo/centos/7/os/x86_64/
/usr/bin/rsync -av rsync://mirrors.ustc.edu.cn/centos/7/extras/x86_64/ /media/pi/Seagate_disk/repo/centos/7/extras/x86_64/
/usr/bin/rsync -av rsync://mirrors.ustc.edu.cn/centos/7/updates/x86_64/ /media/pi/Seagate_disk/repo/centos/7/updates/x86_64/
/usr/bin/rsync -av --exclude=debug rsync://mirrors.ustc.edu.cn/epel/7/x86_64/ /media/pi/Seagate_disk/repo/epel/7/x86_64/
/usr/bin/rsync -av rsync://mirrors.ustc.edu.cn/centos/7/virt/x86_64/ /media/pi/Seagate_disk/repo/centos/7/virt/x86_64/
/usr/bin/rsync -av rsync://mirrors.ustc.edu.cn/centos/6/os/x86_64/ /media/pi/Seagate_disk/repo/centos/6/os/x86_64/
/usr/bin/rsync -av rsync://mirrors.ustc.edu.cn/centos/6/extras/x86_64/ /media/pi/Seagate_disk/repo/centos/6/extras/x86_64/
/usr/bin/rsync -av rsync://mirrors.ustc.edu.cn/centos/6/updates/x86_64/ /media/pi/Seagate_disk/repo/centos/6/updates/x86_64/
/usr/bin/rsync -av rsync://mirrors.ustc.edu.cn/centos/6/virt/x86_64/ /media/pi/Seagate_disk/repo/centos/6/virt/x86_64/
/usr/bin/rsync -av --exclude=debug rsync://mirrors.ustc.edu.cn/epel/6/x86_64/ /media/pi/Seagate_disk/repo/epel/6/x86_64/
同步好了后，就可以通过网页登录查看目录，如图。
2 配置yum repo文件
在你需要新建文件三个CentOS-Base.repo xen.repo epel.repo
[root@CentOS7-1804-01 ~]# #touch /etc/yum.repos.d/{CentOS-Base.repo,epel.repo,xen.repo}
配置好了以后的内容如下，
[root@CentOS7-1804-01 yum.repos.d]# pwd ; ll ; cat CentOS-Base.repo ;echo "+++++++++++++" ; cat epel.repo ; echo "+++++++++++++" ; cat xen.repo
/etc/yum.repos.d
total 28
drwxr-xr-x. 2 root root 63 Aug 1 11:02 .
drwxr-xr-x. 146 root root 12288 Aug 1 10:42 ..
-rw-r--r-- 1 root root 467 Aug 1 11:02 CentOS-Base.repo
-rw-r--r-- 1 root root 146 Aug 1 11:02 epel.repo
-rw-r--r-- 1 root root 131 Aug 1 11:01 xen.repo
[os]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://172.17.2.176/pi/Seagate_disk/repo/centos/7/os/x86_64
enabled=1
gpgcheck=0
[extras]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://172.17.2.176/pi/Seagate_disk/repo/centos/7/extras/x86_64
enabled=1
gpgcheck=0
[updates]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://172.17.2.176/pi/Seagate_disk/repo/centos/7/updates/x86_64
enabled=1
gpgcheck=0
+++++++++++++
[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://172.17.2.176/pi/Seagate_disk/repo/epel/7/x86_64
enabled=1
gpgcheck=0
+++++++++++++
[xen4centos]
name=Xen4 for CentOS 7
baseurl=http://172.17.2.176/pi/Seagate_disk/repo/centos/7/virt/x86_64/xen
enabled=1
gpgcheck=0
3 编写定时同步仓库的脚本
因为仓库随时可能变化，自己编写了个脚本，每隔4小时同步一次仓库，同步机制是和服务器保持完全一致，服务器上删除的本地也删除。
且每次运行脚本，同步三次，因为原仓库有禁止ip并发个数的限制，多试几次成功率高一些。 脚本内容如下，
#!/bin/sh
rsync_centos() {
for((i=1; i<4; i++))
do
/usr/bin/rsync -av --delete rsync://mirrors.ustc.edu.cn/centos/7/os/x86_64/ /media/pi/Seagate_disk/repo/centos/7/os/x86_64/
/usr/bin/rsync -av --delete rsync://mirrors.ustc.edu.cn/centos/7/extras/x86_64/ /media/pi/Seagate_disk/repo/centos/7/extras/x86_64/
/usr/bin/rsync -av --delete rsync://mirrors.ustc.edu.cn/centos/7/updates/x86_64/ /media/pi/Seagate_disk/repo/centos/7/updates/x86_64/
/usr/bin/rsync -av --delete --exclude=debug rsync://mirrors.ustc.edu.cn/epel/7/x86_64/ /media/pi/Seagate_disk/repo/epel/7/x86_64/
/usr/bin/rsync -av --delete rsync://mirrors.ustc.edu.cn/centos/7/virt/x86_64/ /media/pi/Seagate_disk/repo/centos/7/virt/x86_64/
/usr/bin/rsync -av --delete rsync://mirrors.ustc.edu.cn/centos/6/os/x86_64/ /media/pi/Seagate_disk/repo/centos/6/os/x86_64/
/usr/bin/rsync -av --delete rsync://mirrors.ustc.edu.cn/centos/6/extras/x86_64/ /media/pi/Seagate_disk/repo/centos/6/extras/x86_64/
/usr/bin/rsync -av --delete rsync://mirrors.ustc.edu.cn/centos/6/updates/x86_64/ /media/pi/Seagate_disk/repo/centos/6/updates/x86_64/
/usr/bin/rsync -av --delete rsync://mirrors.ustc.edu.cn/centos/6/virt/x86_64/ /media/pi/Seagate_disk/repo/centos/6/virt/x86_64/
/usr/bin/rsync -av --delete --exclude=debug rsync://mirrors.ustc.edu.cn/epel/6/x86_64/ /media/pi/Seagate_disk/repo/epel/6/x86_64/
ping -c4 127.0.0.1 >/dev/null 2>&1
done
}
rsync_centos
exit 0
此时，测试一下，
[root@CentOS7-1804-01 ~]# yum remove -y ftp
Loaded plugins: fastestmirror, langpacks
Resolving Dependencies
--> Running transaction check
---> Package ftp.x86_64 0:0.17-67.el7 will be erased
--> Finished Dependency Resolution
Dependencies Resolved
=======================================================================================================================================================================
Package Arch Version Repository Size
=======================================================================================================================================================================
Removing:
ftp x86_64 0.17-67.el7 @os 96 k
Transaction Summary
=======================================================================================================================================================================
Remove 1 Package
Installed size: 96 k
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Erasing : ftp-0.17-67.el7.x86_64 1/1
Verifying : ftp-0.17-67.el7.x86_64 1/1
Removed:
ftp.x86_64 0:0.17-67.el7
Complete!
[root@CentOS7-1804-01 ~]# yum install ftp -y
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package ftp.x86_64 0:0.17-67.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=======================================================================================================================================================================
Package Arch Version Repository Size
=======================================================================================================================================================================
Installing:
ftp x86_64 0.17-67.el7 os 61 k
Transaction Summary
=======================================================================================================================================================================
Install 1 Package
Total download size: 61 k
Installed size: 96 k
Downloading packages:
ftp-0.17-67.el7.x86_64.rpm | 61 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : ftp-0.17-67.el7.x86_64 1/1
Verifying : ftp-0.17-67.el7.x86_64 1/1
Installed:
ftp.x86_64 0:0.17-67.el7
Complete!
[root@CentOS7-1804-01 ~]#
[root@CentOS7-1804-01 ~]#
[root@CentOS7-1804-01 ~]# yum remove -y lftp
Loaded plugins: fastestmirror, langpacks
Resolving Dependencies
--> Running transaction check
---> Package lftp.x86_64 0:4.4.8-8.el7_3.2 will be erased
--> Finished Dependency Resolution
Dependencies Resolved
=======================================================================================================================================================================
Package Arch Version Repository Size
=======================================================================================================================================================================
Removing:
lftp x86_64 4.4.8-8.el7_3.2 @os 2.4 M
Transaction Summary
=======================================================================================================================================================================
Remove 1 Package
Installed size: 2.4 M
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Erasing : lftp-4.4.8-8.el7_3.2.x86_64 1/1
Verifying : lftp-4.4.8-8.el7_3.2.x86_64 1/1
Removed:
lftp.x86_64 0:4.4.8-8.el7_3.2
Complete!
[root@CentOS7-1804-01 ~]#
[root@CentOS7-1804-01 ~]#
[root@CentOS7-1804-01 ~]# yum install -y lftp
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package lftp.x86_64 0:4.4.8-8.el7_3.2 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=======================================================================================================================================================================
Package Arch Version Repository Size
=======================================================================================================================================================================
Installing:
lftp x86_64 4.4.8-8.el7_3.2 os 751 k
Transaction Summary
=======================================================================================================================================================================
Install 1 Package
Total download size: 751 k
Installed size: 2.4 M
Downloading packages:
lftp-4.4.8-8.el7_3.2.x86_64.rpm | 751 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : lftp-4.4.8-8.el7_3.2.x86_64 1/1
Verifying : lftp-4.4.8-8.el7_3.2.x86_64 1/1
Installed:
lftp.x86_64 0:4.4.8-8.el7_3.2
Complete!
很好，没毛病。速度上来了，就是节省时间，不浪费生命。
