记一次zabbix服务器重启导致的zabbix web界面503提示不可用

近期因某些原因，导致一台平台类服务器重启了，其中上面有个zabbix的监控服务。服务器正常启动之后，zabbix服务正常起来，但是访问web界面时，apache报503故障

 

去查看zabbix服务端的日志没发现异常，怀疑是某个服务没有没有起来，导致访问不可用

这时查看apache的错误日志，发现了一下异常：

[Fri Feb 19 16:50:12.822075 2021] [proxy:error] [pid 27451] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /var/opt/rh/rh-php72/run/php-fpm/zabbix.sock (*) failed
[Fri Feb 19 16:50:12.822131 2021] [proxy_fcgi:error] [pid 27451] [client 127.0.0.1:41278] AH01079: failed to make connection to backend: httpd-UDS
[Fri Feb 19 16:50:14.631067 2021] [proxy:error] [pid 27452] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /var/opt/rh/rh-php72/run/php-fpm/zabbix.sock (*) failed
[Fri Feb 19 16:50:14.631118 2021] [proxy_fcgi:error] [pid 27452] [client 127.0.0.1:41326] AH01079: failed to make connection to backend: httpd-UDS
[Fri Feb 19 16:50:15.936591 2021] [proxy:error] [pid 27453] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /var/opt/rh/rh-php72/run/php-fpm/zabbix.sock (*) failed
[Fri Feb 19 16:50:15.936643 2021] [proxy_fcgi:error] [pid 27453] [client 127.0.0.1:41356] AH01079: failed to make connection to backend: httpd-UDS

原因：

有个服务rh-php72-php-fpm没有启动，导致apache连接到后端的fccgi解析器的时候，连接不上，无法解析php

解决办法：

重新启动该服务即可

systemctl restart rh-php72-php-fpm

这时候，重新打开，就能看到界面了