CentOS 6.7 配置 yum 本地源

在使用yum安装之前是必须配置yum源的, 在不能联网的情况下, 可使用DVD光盘或ISO文件做本地yum源。下面以RHEL6.0为例，其它版本类似。

1. 建立ISO文件存放目录(/repo/iso)和ISO文件的挂载目录(/repo/rhel6)
# mkdir -p /repo/iso
# mkdir -p /repo/rhel6

2.如果有现成的ISO文件可以直接上传至/repo/iso目录下.
[root@node1 ~]# ll /repo/iso/CentOS-6.7-x86_64-bin-DVD1.iso
-rw-r–r–. 1 root root 3895459840 Feb 23 20:15 /repo/iso/CentOS-6.7-x86_64-bin-DVD1.iso

3. 挂载ISO文件
# mount -o loop /repo/iso/CentOS-6.7-x86_64-bin-DVD1.iso /repo/rhel6
[root@node1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 44G 12G 31G 27% /
tmpfs 1.2G 72K 1.2G 1% /dev/shm
/dev/sda1 113M 41M 67M 38% /boot
/dev/sda3 3.8G 10M 3.6G 1% /tmp
/repo/iso/CentOS-6.7-x86_64-bin-DVD1.iso
3.7G 3.7G 0 100% /repo/rhel6

4. 确保系统中已经安装了yum相关软件包
[root@node1 ~]# rpm -qa |grep yum
yum-3.2.29-69.el6.centos.noarch
yum-plugin-security-1.1.30-30.el6.noarch
PackageKit-yum-0.5.8-25.el6.x86_64
yum-utils-1.1.30-30.el6.noarch
yum-metadata-parser-1.1.2-16.el6.x86_64
PackageKit-yum-plugin-0.5.8-25.el6.x86_64
yum-plugin-fastestmirror-1.1.30-30.el6.noarch
版本号可能有所不同, 如果缺少, 请自行安装(这些包基本都默认安装了).

5. 编辑repo文件
[root@MySQL ~]# cd /etc/yum.repos.d/
[root@mysql yum.repos.d]# ll
total 24
-rw-r–r–. 1 root root 1991 Aug 4 2015 CentOS-Base.repo
-rw-r–r–. 1 root root 647 Aug 4 2015 CentOS-Debuginfo.repo
-rw-r–r–. 1 root root 289 Aug 4 2015 CentOS-fasttrack.repo
-rw-r–r–. 1 root root 630 Aug 4 2015 CentOS-Media.repo
-rw-r–r–. 1 root root 6259 Aug 4 2015 CentOS-Vault.repo
[root@mysql yum.repos.d]# mv CentOS-Base.repo CentOS-Base.repo.bak
[root@mysql yum.repos.d]# mv CentOS-Debuginfo.repo CentOS-Debuginfo.repo.bak
[root@mysql yum.repos.d]# mv CentOS-fasttrack.repo CentOS-fasttrack.repo.bak
[root@mysql yum.repos.d]# mv CentOS-Vault.repo CentOS-Vault.repo.bak
[root@mysql yum.repos.d]# ll
total 28
-rw-r–r–. 1 root root 1991 Aug 4 2015 CentOS-Base.repo.bak
-rw-r–r–. 1 root root 647 Jun 1 22:48 CentOS-Debuginfo.repo.bak
-rw-r–r–. 1 root root 289 Aug 4 2015 CentOS-fasttrack.repo.bak
-rw-r–r–. 1 root root 630 Aug 4 2015 CentOS-Media.repo
-rw-r–r–. 1 root root 6259 Aug 4 2015 CentOS-Vault.repo.bak
说明：/etc/yum.repos.d/ 下的文件都是有用的，防止以后有用，这里我们mv改名做备份。
CentOS-Media 这个是使用光盘挂载后调用的文件
CentOS-Base 这个是联网后基础的源
CentOS-Vault 这个是最近新版本的加入的老版本的yum源配置
CentOS-Debuginfo debug包尤其和内核相关的更新和软件安装
— 只剩下 CentOS-Media.repo ，我们用它来做光盘挂载后调用的文件
[root@mysql yum.repos.d]# cat CentOS-Media.repo
[c6-media]
name=CentOS-$releasever – Media
baseurl=file:///repo/rhel6/
# file:///media/cdrom/
# file:///media/cdrecorder/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

解析：

6.清空yum缓存
[root@mysql yum.repos.d]# yum clean all
Loaded plugins: fastestmirror, refresh-packagekit, security
Cleaning repos: c6-media
Cleaning up Everything
[root@mysql yum.repos.d]# yum makecache
Metadata Cache Created

7.生成列表
[root@mysql yum.repos.d]# yum list

8. 测试
[root@mysql yum.repos.d]# yum -y install glibc*
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Loading mirror speeds from cached hostfile
Package glibc-devel-2.12-1.166.el6.x86_64 already installed and latest version
Package glibc-2.12-1.166.el6.x86_64 already installed and latest version
Package glibc-headers-2.12-1.166.el6.x86_64 already installed and latest version
Package glibc-common-2.12-1.166.el6.x86_64 already installed and latest version
。。。省略输出

9.将mount命令写入fstab ## 说明，这步没有测试。
为方便，把这些mount写进/etc/fstab，以便开机就挂载：
/repo/iso/rhel-server-6.0-x86_64-dvd.iso /repo/rhel6 iso9660 loop 0 0