I Think it's called SIM (Service Integrity Monitor).
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I use SIM Myself and as far as im aware it only reboots when a certain server load is reached:
These are the relevant sections for that:
WARN_LD="10" # max load value before status warning (5 minute load avg.)
CRIT_LD="20" # max load value before status critical (5 minute load avg.)
GMSG="false" # send message to all users asking that they logoff for a short period
And further down:
RPP="false" # prioritize nonessential processes at load status warn or crit
# 3 values for RPP: warn, crit, or false
STSRV_LM="warn" # stop nonessential services at load status warn or crit
# 3 values for STSRV_LM: warn, crit, or false
RST_LM="crit" # reboot server at load status warn or crit
# 3 values for RST_LM: warn, crit, or false
Hopefully that will enlighten you a bit and help you decide.
Coight is correct. You are looking for software watchdog. It works very well unless there is a complete system hang. It runs at a very low level so many kernel issues will not impact it. SIM, for example, could fail if cron stopped working.
Some motherboards have watchdog timers built in. These are very good as they operate at the hardware level and can handle most situations.
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