How to avoid a situation where the system is too out-of-memory to even show or kill processes?

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I recently ran into a situation where a system was too out-of-memory to even run pkill or htop, or to even create a swap file.



(But somehow I could still SSH into the system, so at least I had a shell.)



I ended up getting lucky by noticing that I could run ps and kill if I don't run the login shell, but I'm wondering if I hadn't been lucky, what could I have possibly done to avoid rebooting, assuming I still had the login shell?



Is there e.g. to reserve a specific amount of memory for a particular executable to always be able to run? Or is there a way to kill processes from within Bash that doesn't require a fork?




linux bash out-of-memory system-recovery




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  • look at this: unix.stackexchange.com/questions/44985/…
    – Arpit Agarwal
    Nov 11 '17 at 20:40










  • Probably this will help you: how to create a user with limited ram usage
    – FaxMax
    Nov 11 '17 at 20:43














up vote
0
down vote

favorite
1












I recently ran into a situation where a system was too out-of-memory to even run pkill or htop, or to even create a swap file.



(But somehow I could still SSH into the system, so at least I had a shell.)



I ended up getting lucky by noticing that I could run ps and kill if I don't run the login shell, but I'm wondering if I hadn't been lucky, what could I have possibly done to avoid rebooting, assuming I still had the login shell?



Is there e.g. to reserve a specific amount of memory for a particular executable to always be able to run? Or is there a way to kill processes from within Bash that doesn't require a fork?




linux bash out-of-memory system-recovery




share|improve this question




















  • look at this: unix.stackexchange.com/questions/44985/…
    – Arpit Agarwal
    Nov 11 '17 at 20:40










  • Probably this will help you: how to create a user with limited ram usage
    – FaxMax
    Nov 11 '17 at 20:43












up vote
0
down vote

favorite
1









up vote
0
down vote

favorite
1






1





I recently ran into a situation where a system was too out-of-memory to even run pkill or htop, or to even create a swap file.



(But somehow I could still SSH into the system, so at least I had a shell.)



I ended up getting lucky by noticing that I could run ps and kill if I don't run the login shell, but I'm wondering if I hadn't been lucky, what could I have possibly done to avoid rebooting, assuming I still had the login shell?



Is there e.g. to reserve a specific amount of memory for a particular executable to always be able to run? Or is there a way to kill processes from within Bash that doesn't require a fork?




linux bash out-of-memory system-recovery




share|improve this question












I recently ran into a situation where a system was too out-of-memory to even run pkill or htop, or to even create a swap file.



(But somehow I could still SSH into the system, so at least I had a shell.)



I ended up getting lucky by noticing that I could run ps and kill if I don't run the login shell, but I'm wondering if I hadn't been lucky, what could I have possibly done to avoid rebooting, assuming I still had the login shell?



Is there e.g. to reserve a specific amount of memory for a particular executable to always be able to run? Or is there a way to kill processes from within Bash that doesn't require a fork?





linux bash out-of-memory system-recovery





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asked Nov 11 '17 at 20:02









Mehrdad

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  • look at this: unix.stackexchange.com/questions/44985/…
    – Arpit Agarwal
    Nov 11 '17 at 20:40










  • Probably this will help you: how to create a user with limited ram usage
    – FaxMax
    Nov 11 '17 at 20:43
















  • look at this: unix.stackexchange.com/questions/44985/…
    – Arpit Agarwal
    Nov 11 '17 at 20:40










  • Probably this will help you: how to create a user with limited ram usage
    – FaxMax
    Nov 11 '17 at 20:43















look at this: unix.stackexchange.com/questions/44985/…
– Arpit Agarwal
Nov 11 '17 at 20:40




look at this: unix.stackexchange.com/questions/44985/…
– Arpit Agarwal
Nov 11 '17 at 20:40












Probably this will help you: how to create a user with limited ram usage
– FaxMax
Nov 11 '17 at 20:43




Probably this will help you: how to create a user with limited ram usage
– FaxMax
Nov 11 '17 at 20:43















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