PHP crashing?

[jonybat]

Hi

Today, in one of our production instances, there was some issue with IPsec. Dashboard was accessed to check IPsec status and logs, plus firewall logs. After about 4m, dashboard stopped working with "503 Service Unavailable".

Instance was shortly rebooted, and is since then working as expected. As part of RCA, i found this in lighttpd.logs

<27>1 2022-12-16T08:42:41+02:00 vpn-server.localdomain lighttpd 97433 - [meta sequenceId="1"] (gw_backend.c.283) establishing connection failed: socket: unix:/tmp/php-fastcgi.socket-1: Connection refused
<27>1 2022-12-16T08:42:44+02:00 vpn-server.localdomain lighttpd 97433 - [meta sequenceId="2"] (gw_backend.c.360) gw-server re-enabled: unix:/tmp/php-fastcgi.socket-1  0 /tmp/php-fastcgi.socket
...
<27>1 2022-12-16T08:45:44+02:00 vpn-server.localdomain lighttpd 97433 - [meta sequenceId="122"] (gw_backend.c.360) gw-server re-enabled: unix:/tmp/php-fastcgi.socket-1  0 /tmp/php-fastcgi.socket
<27>1 2022-12-16T08:45:45+02:00 vpn-server.localdomain lighttpd 97433 - [meta sequenceId="123"] (gw_backend.c.283) establishing connection failed: socket: unix:/tmp/php-fastcgi.socket-1: Connection refused
<27>1 2022-12-16T08:45:45+02:00 vpn-server.localdomain lighttpd 97433 - [meta sequenceId="124"] (gw_backend.c.283) establishing connection failed: socket: unix:/tmp/php-fastcgi.socket-0: Connection refused
<27>1 2022-12-16T08:45:45+02:00 vpn-server.localdomain lighttpd 97433 - [meta sequenceId="125"] (gw_backend.c.993) all handlers for /api/api.php?digest=fd2e7a3bc8d4bbf00c79b9967f55f464&limit=1000 on .php are down.
<27>1 2022-12-16T08:45:48+02:00 vpn-server.localdomain lighttpd 97433 - [meta sequenceId="126"] (gw_backend.c.360) gw-server re-enabled: unix:/tmp/php-fastcgi.socket-1  0 /tmp/php-fastcgi.socket
<27>1 2022-12-16T08:45:48+02:00 vpn-server.localdomain lighttpd 97433 - [meta sequenceId="127"] (gw_backend.c.360) gw-server re-enabled: unix:/tmp/php-fastcgi.socket-0  0 /tmp/php-fastcgi.socket

It is a virtual instance in an openstack platform, with 1CPU, 2GB of RAM, 150GB UFS. Currently on 22.7.7_1, no additional packages installed. Only serving as an IPsec gateway, with 12 tunnels installed.

Any ideas?

Thanks