I had a couple of situations recently where my firewall got very unresponsive on some services incl the Web UI. Logging into the Web UI then takes up to a minute.
The only thing that helped getting back to normal was a reboot then. How can I diagnose what'S going on?
Some logs on the CLI which I could monitor when it happens?
The system is a an Atom CPU C3558 @ 2.20GHz (4 cores, 4 threads) with 64Gb RAM and ZFS mirrored boot device, latest version installed, all updates.
It does run Zenarmor an I have seen mongod consuming quite some CPU cycles but normally that isn't an issue.
Any hint on how to track this down next time it happens is appreciated.
TIA!
leave ssh enabled and ssh into it when it happens. Use top or htop (needs installing) when it happens and together with ps, it has a chance to see what might be consuming most resources and start narrowing down the problem.