Yum的理解

一、设置挂载

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[root@xue httpd]# mkdir /media/cdrom
[root@xue httpd]# mount -t auto /dev/cdrom /media/cdrom/
mount: /dev/sr0 is write-protected, mounting read-only

二、创建本地目录，复制软件

[root@xue httpd]# mkdir /local_server
[root@xue httpd]# ls /media/cdrom
[root@xue httpd]# cp /media/cdrom/Packages/* -rv /local_server/   //等待一会

三、备份所有repo文件

[root@xue ~]# cd /etc/yum.repos.d/
[root@xue yum.repos.d]# ls
[root@xue yum.repos.d]# vi BackupRepoFile.sh
for file in *
do
        if [ "$file" != "$0" ] && [ "${file:0-4:4}"x = "repo"x ]
        then
                mv $file{,.bak}
        fi
done
[root@xue yum.repos.d]# sh BackupRepoFile.sh

四、创建yum仓库，用createrepo命令

[root@xue yum.repos.d]# vi local_server.repo
[local_server]
name=This is a local repo
baseurl=file:///local_server
enabled=1
gpgcheck=0 
[root@xue yum.repos.d]# cd /local_server/
[root@xue local_server]# rpm -ivh deltarpm-3.6-3.el7.x86_64.rpm python-deltarpm-3.6-3.el7.x86_64.rpm libxml2-python-2.9.1-5.el7_1.2.x86_64.rpm
[root@xue local_server]# rpm -ivh createrepo-0.9.9-23.el7.noarch.rpm
[root@xue local_server]# createrepo -v /local_server/

[root@xue local_server]# cd /local_server/
[root@xue local_server]# ls repodata/

五、清除缓存

[root@xue local_server]# yum clean all

六、使用本地源安装net-tools

[root@xue local_server]# yum list installed | grep net-tools
//如果有返回信息，说明已经安装，则先卸载
//yum remove net-tools
[root@xue local_server]# yum install net-tools