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How to disable Transparent Huge Pages in Linux

Posted on May 11, 2020 by Charanjit Singh

Transparent Huge Pages (THP) is a feature available in mostly Linux distributions or distro which optimizes large memory of the systems as now days systems (computer systems) are coming with large memory. THP can enhance system performance by mapping memory with large physical pages this can be useful in case system is computing multiple processes,…

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Linux kernel 5.5 released with new security and hardware support

Posted on February 3, 2020 by Charanjit Cheema

Linux kernel is a core of Linux Operating system (OS) it work as interface between hardware and processes for OS. Linux kernel was first developed by Linus Torvalds in 1991 since now many kernel have been released. This year Linus Torvalds has announced in his mailing list(LKML) about the released of new stable Linux kernel…

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Understanding of Linux Inodes

Posted on November 15, 2019 by Charanjit Cheema

Introduction to Inode File descriptors, file table and inode table in Linux. Image Source: Wikipedia An inode is a data structure on a filesystem on Linux and other Unix-likeoperating systems that stores all the information about a file except its name and its actual data. Inode is created during creation of file along with file…

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How to recover or rebuild initramfs in CentOS 7 Linux

Posted on June 17, 2019 by Charanjit Cheema

Corruption of initramfs can be occur by many ways for example after patching CentOS 7 Linux OS or installing a buggy device driver in server you found CentOS 7 Linux server has become unbootable. You may also encouter below kernel panic error because server initramfs got damaged . CentOS 7 Linux Kernel Panic screen Now…

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How to Set password policy in CentOS or RHEL system

Posted on May 27, 2019 by Charanjit Cheema

Linux is known for one of most secure Unix Operating System (OS) in world. But that is not mean it is 100% secure there is say in Information Technology (IT) no technology is a completely secure that is why from a System Administrator to CIO they take measure for securing IT infrastructure on regular basis…

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How to use Amazon Cloudwatch to monitor my AWS EC2 resources

Posted on March 14, 2019 by Charanjit Cheema

Amazon CloudWatch is a monitoring service which monitor AWS resources on Cloud. It comes with dozen of monitoring metrics which ease Cloud Admin to use them in monitoring their AWS Infrastructure services resources like Amazon EC2 instances, Amazon S3 Cloud Storage, Amazon RDS (Relational Database Service) on Cloud etc. It collects monitoring and operational data…

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How to convert Amazon EC2 On Demand instance to Amazon EC2 Reserve Instance

Posted on February 27, 2019 by Charanjit Cheema

I was using t2 micro instance for my WordPress website for one year on trial basis as most of you might know AWS provide 750 hours/month free tier usage of its t2 micro instance for a year. But as year passed my instance usage reached high and its trial usage also reached to finish. Due…

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How to backup Linux machine to Amazon S3

Posted on February 11, 2019 by Charanjit Cheema

AWS Amazon S3 is a Simple Cloud object storage solution provided by Amazon. Have a look below what Amazon write and say about S3: Amazon Simple Storage Service (Amazon S3) is an object storage service that offers industry-leading scalability, data availability, security, and performance. This means customers of all sizes and industries can use it…

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What is Windows subsystem for Linux?

Posted on December 19, 2018 by Charanjit Cheema

Microsoft has added Windows Subsystem for Linux (WSL) from Microsoft Windows 10 version 1607 onward and Windows Server 2019 it has replaced the older Windows Services for Unix it is like WINE in Linux which provide compatible layer for running Windows based application on Linux likewise WSL provide a subsystem or layer on which different Linux distro…

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To Activate the Virtual MFA device authentication for AWS console access.

Posted on December 14, 2018 by Charanjit Cheema

Multi-Factor authentication (MFA) is an extra layer of security, it is a combination of more then one credentials which authenticates the user example combination of user password with security token (software or hardware based), using of biomatric verification for authenticating the user credentials. By adding extra layer in security it make difficult for unauthorised person…

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