背景：公司一臺老機器，上面有個cacti。系統為centos5.X，有天手滑卸載了httpd，但yum源已經不支持centos5系列了，無奈百度上找了一個源內容如下：

<span style="background-color: rgb(255, 102, 102);"><strong><span style="color:#ff6666;"># CentOS-Base.repo  
#  
# The mirror system uses the connecting IP address of the client and the  
# update status of each mirror to pick mirrors that are updated to and  
# geographically close to the client.  You should use this for CentOS updates  
# unless you are manually picking other mirrors.  
#  
# If the mirrorlist= does not work for you, as a fall back you can try the   
# remarked out baseurl= line instead.  
#  
#  
  
  
[base]  
name=CentOS-$releasever - Base  
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os  
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/  
baseurl=http://vault.centos.org/5.11/os/$basearch/  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5  
  
  
#released updates   
[updates]  
name=CentOS-$releasever - Updates  
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates  
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/  
baseurl=http://vault.centos.org/5.11/updates/$basearch/  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5  
  
  
#additional packages that may be useful  
[extras]  
name=CentOS-$releasever - Extras  
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras  
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/  
baseurl=http://vault.centos.org/5.11/extras/$basearch/  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5  
  
  
  
  
#additional packages that extend functionality of existing packages  
[centosplus]  
name=CentOS-$releasever - Plus  
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus  
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/  
baseurl=http://vault.centos.org/5.11/centosplus/$basearch/  
gpgcheck=1  
enabled=0  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5  
  
  
  
  
#contrib - packages by Centos Users  
[contrib]  
name=CentOS-$releasever - Contrib  
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib  
#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/  
baseurl=http://vault.centos.org/5.11/contrib/$basearch/  
gpgcheck=1  
enabled=0  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5</span></strong></span>

裝上後發現原本有中文支持的cacti圖片全部不顯示中文了，百度上找了一圈。全是說要麽重新編譯rrdtool，要麽修改src/cacti/lib/function.php加入setlocale(LC_CTYPE,"zh_CN.UTF-8");之類的全部試遍了還是亂碼，最後google到一篇文章，參考其思路解決問題。https://www.iyunv.com/thread-366540-1-1.html

檢查httpd/conf/httpd.conf中發現已有AddDefaultCharset GB2312，且cacti的grph欄中可以正常顯示中文，編碼格式確定。

檢查/etc/sysconfig/httpd文件中發現HTTPD_LANG行為註銷狀態，取消此行前面的#號，修改為HTTPD_LANG=zh_CN.gb2312。

保存，重啟httpd，刷新cacti頁面，大功告成，流量圖中已成功顯示中文。

記錄一次cacti中文亂碼解決經過