Category Archives: OperatingSystem

Linux performance Monitoring Tools

There are a lot of tools used for monitoring the performance in Linux. Here is the list of tools in one image that covers what is monitored by what.  

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xend Error: Acquire running lock failed: 256

Recently I encountered this issue in OVMM 3.2.9  while starting a vm with xm create <vm.cfg path> The reason behind this found was : the vm was not shutdown properly  and the lock file is still there even if VM … Continue reading

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Chef – Create encrypted data bag and keep secrets

Sometimes we have to deal with global variables like User passwords, database password, API Keys, middleware boot properties in our chef recipes which shouldn’t be exposed outside. One solution is we have to keep all the secrets in a data … Continue reading

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send foreground job/running process to run in background

1.Moving Linux job from Foreground Into background : start the program Ctrl+Z (Will pause the program on the terminal) jobs (find the job number from current shell) bg  %jobnum   NOTE : Here we are only sending the process into … Continue reading

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Docker Concept & Setup

Why Containerization ? Up to now we have been working with monolithic applications where different components of service are packaged into a single application which is easy to develop, test and deploy.But when it becomes large and complex it’s become difficult … Continue reading

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Forking vs Threading

What is Fork/Forking: Fork is nothing but a new process that looks exactly like the old or the parent process but still it is a different process with different process ID and having  it’s own memory. Parent process creates a … Continue reading

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