Using TAR Command Practically in Linux
tar is a commonly used command to create archive files. TAR stands for Tape ARchive. It is important to note that tar is …
Linux
Easiest Way to Exclude NFS Mount Points in Find Command
Today, I was told to remove a domain group from the active directory. However, there were files/directories owned by …
Easiest Way to Increase Linux LVM by Expanding Virtual Disk
Today, I come across a situation where I had to increase the size of lvm partition without adding a new virtual disk.
How to Append a Text/Line to Root Owned Files With Sudo Access
Today, I came across a situation where I was writing a script for automation. In the script, I had to append a line to …
How to Check if Server Is BIOS/UEFI Booted in CentOS/RHEL
If you are planning to use a hard disk of size more than 2TB UEFI comes into the picture. Today, I came across a …
KVM: Common Issues and How to Troubleshoot Them
This post lists KVM known issues, how to troubleshoot and resolve them. Error: Log files There are various trace/log …
How Does Vm.swappiness Value Affects System Performance
The kernel uses heuristics to guess which pages of memory are likely to be needed in the near future and tries to keep …
Failed to Synchronize Cache for Repo 'Repo_name', Ignoring This Repo.
The Problem While installing package or listing using dnf or yum commands getting below errors: # dnf repolist Oracle …
How to Use Strace in Linux to Debug Process Hung Issues
The strace utility is a debugging utility for Linux which is used to monitor the system calls used by a program and all …
How to Automatically Start STRACE or TRUSS With PL/SQL
Why to Start STRACE and TRUSS with PL/SQL There are times when a STRACE or TRUSS tracing utilities would help diagnose …
"Fork of '/Bin/Systemd-Detect-Virt' Failed: Cannot Allocate Memory" - CentOS/RHEL 7 Booting Issue
The Problem System fails to boot with below errors: [12.524044] systemd-udevd: fork of '/bin/uname -p' failed: …