How to track where umount: /custom: target is busy ?
Lets see how to track where a partition is busy when it does not allow us to umount. I. Error Message [root@ngelinux001 ~]# umount /custom umount: /custom: target is...
Tag: unix
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Solved: [error] Unable to obtain semaphore.
Today we will see an interesting article how to resolve below error. I. Error Details [root@ngelinux001 conf.d]# service httpd start Starting httpd: [Wed May 18 23:41:31 2022] [notice] suEXEC mechanism...
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Solved: chgrp: changing group of `testfile’: Operation not permitted. How to solve NFS 16 group limit ?
Today we will see an interesting issue and its solution why we are getting chgrp “changing group of testfile”: operation not permitted error. I. Error Details Below we can...
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Identify CPU clock speed when its not visible under different commands like lscpu ?
In this article, we will see how to check CPU clock speed on Linux or Unix servers when its not visible under different commands. 1. Check CPU Info [root@ngelinux001~]# cat...
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Solved: cron jobs stopped working automatically ?
Today we will see an interesting bug when the cron jobs stopped working on the system automatically. It is identified when we have multiple job schedulers available on the system....
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How to add a custom file in log rotation in linux ?
Today in this post, we will look how to add a custom file in log rotation. This will help to do automated housekeeping on the server. Lets suppose we have...
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How to set maximum user processes in Linux ?
In this post, we will look how to set maximum user processes in linux. I. Check current process limit. user@server02:~> ulimit -a core file size (blocks, -c) unlimited data seg...
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Solved: Error with swapon: swapon failed: Invalid argument.
Today in this article, we will look at an interesting issue where we are getting error while adding new swap. I. Issue/Error Message bash-4.2$ sudo swapon -a swapon: /oracle/swapfile:...
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How to check and update new font in Centos/Redhat Linux ?
Today lets see how to check and update new fonts in CentOS or Redhat Linux. This is very useful tip to manage fonts on your Linux system. Lets see if...
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Solved: Samba share not accessible – Error NT_STATUS_NO_TRUST_SAM_ACCOUNT ?
Today we will see one of the most common issues with respect to samba where the share is not accessible. To troubleshoot this, we will see how to proceed step...