Often my server stops responding to ALL services and becomes unavailable even to ssh, just because some php scripts make MySQL eat up all memory.<br />
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I know that my php scripts are bad and full of errors, but in a proper OS the system would NEVER, EVER go down completely just because of ONE misbehaving process. The offending process should be killed or denied memory allocation before the whole system becomes dead because of insufficient ram and swap. It's simply ridiculous.<br />
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Also, if for whatever reason it still responds to ping, then WHATEVER makes that possible for the ping daemon should be done for SSH. SSH is much more vital than ping, so if it is possible to make the system remain capable of responding to ping whatever happens, then the same MUST be done for the ssh service. So that the administrator can log into the server and kill whatever process is causing it to hang.<br />
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See <a href="http://serverfault.com/questions/440670/what-can-cause-all-services-on-a-server-to-go-down-yet-still-responding-to-ping">http://serverfault.com/questions/440670/what-can-cause-all-services-on-a-server-to-go-down-yet-still-responding-to-ping</a> [<a href="http://serverfault.com/questions/440670/what-can-cause-all-services-on-a-server-to-go-down-yet-still-responding-to-ping" target="_blank">^</a>]
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