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

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP











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












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





share|improve this question











share|improve this question




share|improve this question










asked Nov 11 '17 at 20:02









Mehrdad

1,12831430




1,12831430











  • 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















active

oldest

votes











Your Answer







StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "106"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
convertImagesToLinks: false,
noModals: false,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);



);













 

draft saved


draft discarded


















StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f403943%2fhow-to-avoid-a-situation-where-the-system-is-too-out-of-memory-to-even-show-or-k%23new-answer', 'question_page');

);

Post as a guest






















active

oldest

votes













active

oldest

votes









active

oldest

votes






active

oldest

votes















 

draft saved


draft discarded















































 


draft saved


draft discarded














StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f403943%2fhow-to-avoid-a-situation-where-the-system-is-too-out-of-memory-to-even-show-or-k%23new-answer', 'question_page');

);

Post as a guest
































































-

Popular posts from this blog

How to check contact read email or not when send email to Individual?

Image
Clash Royale CLAN TAG #URR8PPP up vote 1 down vote favorite I'm using WordPress 4.9.8, CiviCRM to 5.5.1, I usually send email to contact by Search> Find contacts View contact details Action> Send email Send email ok, Contact received mail ok like picture But status only Email sent though contact read email or not. So, can CiviCRM can change status to Email read when contact read email? wordpress email share | improve this question asked Sep 26 at 0:12 ToanLuong 49 9 add a comment  |  up vote 1 down vote favorite I'm using WordPress 4.9.8, CiviCRM to 5.5.1, I usually send email to contact by Search> Find contacts View contact details Action> Send email Send email ok, Contact received mail ok like picture But status only Email sent though contact read email or not. So, can CiviCRM can change status to Email read when contact read email? wordpress email share | improve this questi...
Read more

Displaying single band from multi-band raster using QGIS

Image
Clash Royale CLAN TAG #URR8PPP 1 How can I extract a single band from multi-band raster in QGIS? I have an remote sensed image which has 6 bands (including NDVI band), I want to display each band separately, but have no idea how to do. I have seen some questions similar here but none worked for me. The original image (has 6 bands) is: I want to display the band 6 which should be like this: But I tried gdal_translate, and couldn't get the correct result. What I have got is: qgis raster multi-band share | improve this question edited Mar 5 at 0:53 Summer asked Mar 4 at 6:42 Summer Summer 23 6 Is this any help gis.stackexchange.com/questions/220658/… ? if not gis.stackexchange.com/questions/62133/… might help. – Michael Stimson Mar 4 at 6:46 Thanks for answering but when I used gdal_translate, qgis showed that 'Error 4: Kayena.tif: No such file or directory". Would you know how to fi...
Read more

How many registers does an x86_64 CPU actually have?

Image
Clash Royale CLAN TAG #URR8PPP up vote 2 down vote favorite I am currently learning reverse engineering and am studying the flags register. I had in my mind that rflags was just another name for one of the 16 general purpose registers, for example rax or rbx . But it looks like rflags is actually an additional register. So that makes 17 registers in total... how many more could there be? I have spent at least an hour on this and found numerous different answers. The best answer so far is this, which says that there are 40 registers in total. 16 General Purpose Registers 2 Status Registers 6 Code Segment Registers 16 SSE Registers 8 FPU/MMX Registers But if I add that up, I get 48. Could anybody provide an official answer on how many registers an x86_64 CPU has (e.g. an Intel i7). Additionally, I have seen references to 'hardware' and 'architectural' registers. What are those registers and how many are there? register x86-64 share | improve this...
Read more