建立文件夹
[root@localhost CentOS]# mkdir /media/CentOS把光盘加载到本地[root@localhost CentOS]# mount /dev/cdrom /media/CentOS在/etc/yum.repos.d/目录下，有两个文件CentOS-Base.repo和CentOS-Media.repo其中CentOS-Base.repo记录着网络上的yum源的地址和路径信息等CentOS-Media.repo记录着可以从本地作为yum源的介质和路径。其中还有这样一个说明：# CentOS-Media.repo # # This repo is used to mount the default locations for a CDROM / DVD on # CentOS-5. You can use this repo and yum to install items directly off the # DVD ISO that we release. # # To use this repo, put in your DVD and use it with the other repos too: # yum –enablerepo=c5-media [command] # # or for ONLY the media repo, do this: # # yum –disablerepo=\* –enablerepo=c5-media [command][c5-media] name=CentOS-$releasever – Media baseurl=file:///media/ CentOS gpgcheck=1 enabled=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-beta我们只需编辑下bashurl ，将自己的光盘路径写入就可以了。觉得自己的光盘的源足够用了。不需要网络源，，或者没有网络。可以使用yum –disablerepo=\* –enablerepo=c5-media [command]yum命令允许使用本地media介质的源而已。正确的命令如下（更新gcc为例）：[root@centos cdrom]# yum –disablerepo =* –enablerepo=c5-media install gcc Loading ” installonlyn ” plugin Setting up Update Process Setting up repositories c5 – media 100 % |=========================| 1.1 kB 00 : 00 Reading repository metadata in from local files primary.xml.gz 100 % |=========================| 834 kB 00 : 00 ################################################## 2400 / 2400 No Packages marked for Update / Obsoletion比如安装gdb[root@centos cdrom]# yum –disablerepo =* –enablerepo=c5-media install gdb Loading ” installonlyn ” plugin Setting up Install Process Setting up repositories Reading repository metadata in from local files Parsing package install arguments Resolving Dependencies –> Populating transaction set with selected packages. Please wait. —> Downloading header for gdb to pack into transaction set . gdb – 6.5 – 25 .el5.i386.rpm 100 % |=========================| 56 kB 00 : 00 —> Package gdb.i386 0 : 6.5 – 25 .el5 set to be updated –> Running transaction check Dependencies Resolved ============================================================================= Package Arch Version Repository Size ============================================================================= Installing: gdb i386 6.5 – 25 .el5 c5 – media 3.1 M Transaction Summary ============================================================================= Install 1 Package(s) Update 0 Package(s) Remove 0 Package(s) Total download size: 3.1 M Is this ok [y / N]: y Downloading Packages: Running Transaction Test Finished Transaction Test Transaction Test Succeeded Running Transaction Installing: gdb ######################### [ 1 / 1 ] Installed: gdb.i386 0 : 6.5 – 25 .el5 Complete ! [root@centos cdrom]#在使用yum进行install时，经常会出现下面的错误 warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 1ac70ce6 导致安装不能进行。解决方法如下： [root@localhost CentOS]# rpm –import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 [root@localhost CentOS]# rpm –import /etc/pki/rpm-gpg/RPM-GPG-KEY-beta
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