I am currently trying to improve my failover strategies. Aside from adding a DNS failover I want to make sure I am able to log in via a shell

Whenever the server is overloaded I am unable to log in or at least it takes 20 minutes - 60 minutes until I can stop the service that is overloading the service

Of course the best strategy is to avoid overloads in the first place, however it would be nice to know if there is a way to reserve resources for a shell or a script

Any suggestions for failover / emergency situations are appreciated


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    This is one of the many reasons you need out-of-band management for your servers - the ability to sign in using the real console. – EEAA Dec 14 '13 at 20:04

On modern linuxes you can use cgroups to reserve certain system resources and/or limit applications so the don't use all resources.

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