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SSH screen dies every now and then



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
2019 Community Moderator Election Results
Why I closed the “Why is Kali so hard” questionssh and character encodingHow to prevent a program from dying when its ssh session dies?SSH server timing out localhost and reassigning breaks X11 outputSSH public key login: two different keys and SSH_AUTH_SOCK behaviourWhat linux server settings allow my long running processes to keep running after the terminal is closed/terminated?Can't start presentation on remote computer console session from an SSH sessionHow to read bash config when working with SSH remote sessionsrunning screen in a shell can't find sessions but running screen during ssh login canAuthenticate SSH session from detached screen session on Server to Other Server without password auth and without storing keys on ServerSSH hangs before login prompt



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1















I am trying to run node.js app. Every now and then I find that my app is not running & I have no idea why. I have used nodemon, forever, nohup. When I set screen, find few days later that my app is again down, I login into SSH and see that screen is dead.
When starting my app with forever I see warning saying I have not set --minUptime, --spinSleepTime and default 10000ms is used. Does that mean when my host server fails to reply in 10 seconds, my "forever" is getting terminated?



Edit: As It is my first project to host it like this, I am not sure what info to share and where to get it, as far as I know I am hosting my server at a2hosting.com, with server that has 2x2.1 ghz CPU and 3gb RAM.










share|improve this question
























  • No. Spinning is when an app won't start and forever keeps trying to restart it in an endless loop. If it dies in less than 10 seconds forever will sleep a while before trying again. If it dies in more than 10 seconds forever will immediately restart it.

    – Philip Couling
    Jan 9 at 11:04











  • These type of failures are very difficult to diagnose. Generally you try to ensure adequate logging to a file not to screen. Could you edit into your question more information about the server you are running this on? There are some issues you can face with virtual machines where processes are killed due to memory or even CPU constraints.

    – Philip Couling
    Jan 9 at 11:06


















1















I am trying to run node.js app. Every now and then I find that my app is not running & I have no idea why. I have used nodemon, forever, nohup. When I set screen, find few days later that my app is again down, I login into SSH and see that screen is dead.
When starting my app with forever I see warning saying I have not set --minUptime, --spinSleepTime and default 10000ms is used. Does that mean when my host server fails to reply in 10 seconds, my "forever" is getting terminated?



Edit: As It is my first project to host it like this, I am not sure what info to share and where to get it, as far as I know I am hosting my server at a2hosting.com, with server that has 2x2.1 ghz CPU and 3gb RAM.










share|improve this question
























  • No. Spinning is when an app won't start and forever keeps trying to restart it in an endless loop. If it dies in less than 10 seconds forever will sleep a while before trying again. If it dies in more than 10 seconds forever will immediately restart it.

    – Philip Couling
    Jan 9 at 11:04











  • These type of failures are very difficult to diagnose. Generally you try to ensure adequate logging to a file not to screen. Could you edit into your question more information about the server you are running this on? There are some issues you can face with virtual machines where processes are killed due to memory or even CPU constraints.

    – Philip Couling
    Jan 9 at 11:06














1












1








1








I am trying to run node.js app. Every now and then I find that my app is not running & I have no idea why. I have used nodemon, forever, nohup. When I set screen, find few days later that my app is again down, I login into SSH and see that screen is dead.
When starting my app with forever I see warning saying I have not set --minUptime, --spinSleepTime and default 10000ms is used. Does that mean when my host server fails to reply in 10 seconds, my "forever" is getting terminated?



Edit: As It is my first project to host it like this, I am not sure what info to share and where to get it, as far as I know I am hosting my server at a2hosting.com, with server that has 2x2.1 ghz CPU and 3gb RAM.










share|improve this question
















I am trying to run node.js app. Every now and then I find that my app is not running & I have no idea why. I have used nodemon, forever, nohup. When I set screen, find few days later that my app is again down, I login into SSH and see that screen is dead.
When starting my app with forever I see warning saying I have not set --minUptime, --spinSleepTime and default 10000ms is used. Does that mean when my host server fails to reply in 10 seconds, my "forever" is getting terminated?



Edit: As It is my first project to host it like this, I am not sure what info to share and where to get it, as far as I know I am hosting my server at a2hosting.com, with server that has 2x2.1 ghz CPU and 3gb RAM.







ssh






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Jan 9 at 11:32







user1203497

















asked Jan 9 at 10:56









user1203497user1203497

63




63












  • No. Spinning is when an app won't start and forever keeps trying to restart it in an endless loop. If it dies in less than 10 seconds forever will sleep a while before trying again. If it dies in more than 10 seconds forever will immediately restart it.

    – Philip Couling
    Jan 9 at 11:04











  • These type of failures are very difficult to diagnose. Generally you try to ensure adequate logging to a file not to screen. Could you edit into your question more information about the server you are running this on? There are some issues you can face with virtual machines where processes are killed due to memory or even CPU constraints.

    – Philip Couling
    Jan 9 at 11:06


















  • No. Spinning is when an app won't start and forever keeps trying to restart it in an endless loop. If it dies in less than 10 seconds forever will sleep a while before trying again. If it dies in more than 10 seconds forever will immediately restart it.

    – Philip Couling
    Jan 9 at 11:04











  • These type of failures are very difficult to diagnose. Generally you try to ensure adequate logging to a file not to screen. Could you edit into your question more information about the server you are running this on? There are some issues you can face with virtual machines where processes are killed due to memory or even CPU constraints.

    – Philip Couling
    Jan 9 at 11:06

















No. Spinning is when an app won't start and forever keeps trying to restart it in an endless loop. If it dies in less than 10 seconds forever will sleep a while before trying again. If it dies in more than 10 seconds forever will immediately restart it.

– Philip Couling
Jan 9 at 11:04





No. Spinning is when an app won't start and forever keeps trying to restart it in an endless loop. If it dies in less than 10 seconds forever will sleep a while before trying again. If it dies in more than 10 seconds forever will immediately restart it.

– Philip Couling
Jan 9 at 11:04













These type of failures are very difficult to diagnose. Generally you try to ensure adequate logging to a file not to screen. Could you edit into your question more information about the server you are running this on? There are some issues you can face with virtual machines where processes are killed due to memory or even CPU constraints.

– Philip Couling
Jan 9 at 11:06






These type of failures are very difficult to diagnose. Generally you try to ensure adequate logging to a file not to screen. Could you edit into your question more information about the server you are running this on? There are some issues you can face with virtual machines where processes are killed due to memory or even CPU constraints.

– Philip Couling
Jan 9 at 11:06











1 Answer
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0














This is maybe a long shot.. Personally I have had problems in the past with other applications running in screen in case the application has been outputting data but the client connection has become blocked due to e.g. network problems. By default this blocks the application as well, which may trigger anomalous behaviour in the application. To stop a blocked client connection from affecting the application you can add this line to ~/.screenrc:



defnonblock on


You will need to restart screen for this to take effect.






share|improve this answer

























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    0














    This is maybe a long shot.. Personally I have had problems in the past with other applications running in screen in case the application has been outputting data but the client connection has become blocked due to e.g. network problems. By default this blocks the application as well, which may trigger anomalous behaviour in the application. To stop a blocked client connection from affecting the application you can add this line to ~/.screenrc:



    defnonblock on


    You will need to restart screen for this to take effect.






    share|improve this answer





























      0














      This is maybe a long shot.. Personally I have had problems in the past with other applications running in screen in case the application has been outputting data but the client connection has become blocked due to e.g. network problems. By default this blocks the application as well, which may trigger anomalous behaviour in the application. To stop a blocked client connection from affecting the application you can add this line to ~/.screenrc:



      defnonblock on


      You will need to restart screen for this to take effect.






      share|improve this answer



























        0












        0








        0







        This is maybe a long shot.. Personally I have had problems in the past with other applications running in screen in case the application has been outputting data but the client connection has become blocked due to e.g. network problems. By default this blocks the application as well, which may trigger anomalous behaviour in the application. To stop a blocked client connection from affecting the application you can add this line to ~/.screenrc:



        defnonblock on


        You will need to restart screen for this to take effect.






        share|improve this answer















        This is maybe a long shot.. Personally I have had problems in the past with other applications running in screen in case the application has been outputting data but the client connection has become blocked due to e.g. network problems. By default this blocks the application as well, which may trigger anomalous behaviour in the application. To stop a blocked client connection from affecting the application you can add this line to ~/.screenrc:



        defnonblock on


        You will need to restart screen for this to take effect.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited 10 hours ago









        Rui F Ribeiro

        42.1k1484142




        42.1k1484142










        answered Jan 9 at 11:45









        Jonas BerlinJonas Berlin

        46159




        46159



























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