openresty无限重启

网站已稳定运行200多天,前几天更新升级了面板,今天发现这个问题

1Panel 版本:2.1.13
操作系统(设备): debian12
关键截图:

日志:1Panel-openresty-lBAc | 2026/06/01 09:42:33 [emerg] 1#1: host not found in upstream “f.ppt2.cn” in /www/sites/d.wuweibike.com/proxy/down.conf:2
1Panel-openresty-lBAc | nginx: [emerg] host not found in upstream “f.ppt2.cn” in /www/sites/d.wuweibike.com/proxy/down.conf:2
1Panel-openresty-lBAc | 2026/06/01 09:43:33 [emerg] 1#1: host not found in upstream “f.ppt2.cn” in /www/sites/d.wuweibike.com/proxy/down.conf:2
1Panel-openresty-lBAc | nginx: [emerg] host not found in upstream “f.ppt2.cn” in /www/sites/d.wuweibike.com/proxy/down.conf:2
1Panel-openresty-lBAc | 2026/06/01 09:44:34 [emerg] 1#1: host not found in upstream “f.ppt2.cn” in /www/sites/d.wuweibike.com/proxy/down.conf:2
1Panel-openresty-lBAc | nginx: [emerg] host not found in upstream “f.ppt2.cn” in /www/sites/d.wuweibike.com/proxy/down.conf:2
1Panel-openresty-lBAc | 2026/06/01 09:45:34 [emerg] 1#1: host not found in upstream “f.ppt2.cn” in /www/sites/d.wuweibike.com/proxy/down.conf:2
1Panel-openresty-lBAc | nginx: [emerg] host not found in upstream “f.ppt2.cn” in /www/sites/d.wuweibike.com/proxy/down.conf:2

手动把配置里的f.ppt2.cn换成可以打开的站,恢复正常了。
为什么因为单个站点的源站打不开而整个openresty崩掉呢?

这是 nginx 的逻辑