RedHat 設定使用Centos yum 安裝套件

因RedHat yum install 需要license才可以使用
故使用Centos 的yum 設定來安裝套件



1.建立CentOS repo設定
# vi /etc/yum.repos.d/CentOS.repo

編輯為以下內容，以 RHEL 6 為例子, 如果是其他 RHEL 版本, 例如 RHEL 7, 需要將下面的 “6” 改為 “7”

[CentOS6 base]
name=CentOS-6-Base
mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=os
gpgcheck=1
enabled=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
[CentOS6 updates]
name=CentOS-6-Updates
mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=updates
gpgcheck=1
enabled=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
[CentOS5plus]
name=CentOS-6-Plus
mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=centosplus
gpgcheck=1
enabled=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6

[centos]
name=CentOS $releasever - $basearch
baseurl=http://ftp.heanet.ie/pub/centos/6/os/$basearch/
enabled=1
gpgcheck=0

2.關閉RHEL 原本的repo設定
將原本的repo內所有的enabled=1
修改為enabled=0

3.執行以下指令匯入CentOS的GPG key,同樣要針對OS版本修改
# rpm --import http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6

4.如出現以下錯誤訊息

Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=centosplus error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"


 One of the configured repositories failed (Unknown),
 and yum doesn't have enough cached data to continue. At this point the only
 safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).

     3. Disable the repository, so yum won't use it by default. Yum will then
        just ignore the repository until you permanently enable it again or use
        --enablerepo for temporary usage:

            yum-config-manager --disable <repoid>

     4. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
        so will have to try and fail each time (and thus. yum will be be much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:

            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: CentOS5plus/x86_64

需修改/etc/resolv.conf，增加DNS設定
nameserver 168,95.1.1