由於centos6已經停止更新，各yum映象已經下架了相關依賴包，需要更換yum源為參考1、參考2，具體如下：
備份原yum配置檔案
將目錄/etc/yum.repos.d下repo檔案放入repo_bak資料夾。
wget -o /etc/yum.repos.d/centos-base.repo修改repo檔案內容：
name=centos-$releasever - updates - mirrors.aliyun.com
failovermethod=priority
baseurl=
gpgcheck=0
gpgkey=
#additional packages that may be useful
[extras]
name=centos-$releasever - extras - mirrors.aliyun.com
failovermethod=priority
baseurl=
gpgcheck=0
gpgkey=
#additional packages that extend functionality of existing packages
[centosplus]
name=centos-$releasever - plus - mirrors.aliyun.com
failovermethod=priority
baseurl=
gpgcheck=0
enabled=0
gpgkey=
#contrib - packages by centos users
[contrib]
name=centos-$releasever - contrib - mirrors.aliyun.com
failovermethod=priority
baseurl=
gpgcheck=0
enabled=0
gpgkey=
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