使用光盘镜像作为软件yum源：
[1]上传centos7光盘镜像到/usr/local/src目录下；（工具Xftp）
[2]挂载系统文件
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mkdir /media/cdrom # 习惯用这个目录名称了；
cd /usr/local/src
ls
CentOS-7.0-1406-x86_64-DVD.iso
# mount -t iso9660 -o loop /usr/local/src/CentOS-7.0-1406-x86_64-DVD.iso /media/cdrom/
mount: /dev/loop0 is write-protected, mounting read-only
# cd /media/cdrom/
[root@mariadb cdrom]# ls
CentOS_BuildTag EULA images LiveOS repodata RPM-GPG-KEY-CentOS-Testing-7
EFI GPL isolinux Packages RPM-GPG-KEY-CentOS-7 TRANS.TBL
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[3]设置开机自动挂载系统镜像文件
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vim /etc/fstab
/usr/local/src/CentOS-7.0-1406-x86_64-DVD.iso /media/cdrom/ iso9660 defaults,ro,loop 0 0
:x #保存并退出
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备注：iso9660 CD-ROM光盘的标准文件系统
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mount -l
/usr/local/src/CentOS-7.0-1406-x86_64-DVD.iso on /media/cdrom type iso9660 (ro,relatime) [CentOS 7 x86_64]
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[4]配置本地yum源文件；
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vim /etc/yum.repos.d/centos7-media.repo
[centos7-media]
name=Red Hat Centos linux 7.0 # 自己定义
baseurl=file:///media/cdrom # 本地镜像文件路径
enabled=1 # 1为启动yum源，0为禁用
gpgcheck=1 # 1为检查GPG-KEY，0为不检查
gpgkey=file:///media/cdrom/RPM-GPG-KEY-CentOS-7 #GPG-KEY文件路径
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yum clean all #清除缓存
Loaded plugins: fastestmirror
Cleaning repos: base centos7-media epel extras updates
Cleaning up everything
Cleaning up list of fastest mirrors
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[root@mariadb ~]# yum makecache #缓存本地yum源包信息
Loaded plugins: fastestmirror
base | 3.6 kB 00:00:00
centos7-media | 3.6 kB 00:00:00
epel/x86_64/metalink | 5.3 kB 00:00:00
epel | 4.4 kB 00:00:00
extras | 3.3 kB 00:00:00
updates | 3.4 kB 00:00:00
(1/20): centos7-media/group_gz | 157 kB 00:00:00
(2/20): centos7-media/filelists_db | 2.8 MB 00:00:00
(3/20): base/7/x86_64/group_gz | 157 kB 00:00:00
(4/20): centos7-media/primary_db | 2.7 MB 00:00:00
(5/20): centos7-media/other_db | 1.1 MB 00:00:00
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[5]使用本地yum源安装软件：
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# yum --enablerepo=centos7-media search httpd # 查看是否有httpd软件包
...
httpd.x86_64 : Apache HTTP Server
httpd-devel.x86_64 : Development interfaces for the Apache HTTP server
httpd-itk.x86_64 : MPM Itk for Apache HTTP Server
httpd-manual.noarch : Documentation for the Apache HTTP server
httpd-tools.x86_64 : Tools for use with the Apache HTTP Server
...
# yum --enablerepo=centos7-media -y install httpd
Installed:
httpd.x86_64 0:2.4.6-18.el7.centos
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# rpm -qa httpd
httpd-2.4.6-18.el7.centos.x86_64
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到此本地yum源已配置完毕！
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