Category Archives: OperatingSystem

pexpect alternative in python for remote connection

We generally use python pexpect module to connect system remotely with ssh and execute our tasks. But sometimes pexpect module is not found to be installed in remote systems which create problems. And this problem can be solved with the … Continue reading

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Accessing Host from Docker Container

Sometime we need to access the services that are running in the host machine to be accessible from the docker container.  e.g. In on of my project, we needed to connect to the oracle db (port 1521) from inside the … Continue reading

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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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