最近需要下服務器上安裝gitlab，在使用yum安裝postfix之後，啟動post報錯，進行debug顯示如下錯誤提示

[root@localhost ~]# systemctl status postfix.service
● postfix.service - Postfix Mail Transport Agent
   Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since 五 2018
 
-03-02 09:43:51 CST; 27min ago
  Process: 11414 ExecStart=/usr/sbin/postfix start (code=exited, status=127)
  Process: 11411 ExecStartPre=/usr/libexec/postfix/chroot-update (code=exited, status=0/SUCCESS)
  Process: 11408 ExecStartPre=/usr/libexec/postfix/aliasesdb (code=exited, status=127)

3月 02 09:43:51 localhost.localdomain systemd[1
 
]: Starting Postfix Mail Transport Agent...
3月 02 09:43:51 localhost.localdomain aliasesdb[11408]: /usr/sbin/postconf: error while loading shared libraries: libmysqlclient.so.18: cannot op...rectory
3月 02 09:43:51 localhost.localdomain aliasesdb[11408]: /usr/bin/newaliases: error while loading shared libraries: libmysqlclient.so.18
 
: cannot o...rectory
3月 02 09:43:51 localhost.localdomain postfix[11414]: /usr/sbin/postfix: error while loading shared libraries: libmysqlclient.so.18: cannot open...irectory
3月 02 09:43:51 localhost.localdomain systemd[1]: postfix.service: control process exited, code=exited status=127
3月 02 09:43:51 localhost.localdomain systemd[1]: Failed to start Postfix Mail Transport Agent.
3月 02 09:43:51 localhost.localdomain systemd[1]: Unit postfix.service entered failed state.
3月 02 09:43:51 localhost.localdomain systemd[1]: postfix.service failed.

　　錯誤顯示的是libmysqlclient.so.18沒有找到。

　　在google解決方法之後，找到的解決方法

　　　　在mysql的安裝路徑下找到libmysqlclient.so.18，再使用軟連接 到/usr/lib路徑下。

　　在完成添加之後啟動還是會顯示上面的錯誤，最終把postfix卸載掉 重新yum 安裝才正常啟動

postfix找不到libmysqlclient.so.18