Monkey business for the geek in you!
Linux Server Managment
I noticed that /var/cache/apt/archives/ taking lots of disk space on my AWS EC2 cloud server powered by Debian Linux. Can I delete /var/cache/apt/archives/ folder? Is it safe to remove all files? Do we absolutely necessary to keep all these files?APT is a set of command found on Debian based operating systems. One can use apt-get…
How do I check swap (paging) usage under Linux operating systems using command bash/ksh line options? How do I check swap usage size on Linux operating system?Swap space (also known as paging) is nothing but computer memory management involving swapping regions of memory to and from storage. You can see swap usage summary by device…
I need to list all open ports in Linux cloud server. How do I check open ports in Linux using the CLI? Can you give me the command to check open ports in Linux operating system?To troubleshoot server problems and to avoid security issue, one needs to find out open TCP and UDP ports. In…
Hyperledger Explorer is a powerful utility that allows users to create user-friendly web-based applications. It is a blockchain dashboard and provides the ability to view, invoke, deploy, and query raw blockchain data and network information, including block details, chain codes, and transactions stored in the ledger. For those who are not familiar with Hyperledger project…
How do I configure automatic updates for Ubuntu Linux 18.04 LTS “Bionic Beaver” server?The Linux server security is indeed an essential task for sysadmins. One of the most fundamental ways to keep the server secure is by installing security updates on time to patch vulnerabilities. You need to install the unattended-upgrades package. It will automatically…
I am a new Debian Linux / Ubuntu Linux LTS user. How do I reinstall a package using apt-get command line? Is there an ‘apt-get force reinstall package’ command? The Advanced Packaging Tool (APT) works on both Debian / Ubuntu Linux. It can handle the installation and removal of software including reinstalling packages to fix…
I am on Red Hat Enterprise Linux server. Is there is an easy way to run script or command at boot time after fresh reboot command? How can I execute cron job on Linux after system restart?crontab is the program used to install, deinstall, or list the tables used to drive the cron daemon in…
I have installed memcached server under Linux, but it is still showing old data. How do I flush the contents of a Memcached instance / server on Linux or Unix-like systems?You can invalidate all existing cache items using the flush_all command. This command does not pause the server, as it returns immediately. It does not…
I need to disable SELinux on CentOS 7. How can I disable SELinux from the command line over ssh based session?SELinux is an acronym for Security-Enhanced Linux. It is a Linux kernel security feature for access control. For example, with the help of SELinux sysadmin can determine which Linux server users and apps can access…
I do not want to use Adobe flash based speed testing site due to security concern on my desktop. How do I install Speedtest-cli on a CentOS Linux or Fedora Linux or Red Hat Enterise Linux (RHEL) for checking the Internet speed?Adobe Flash vulnerabilities are a major security issue for Linux users and speedtest.net use…
When invoked without arguments, the date command displays the current date and time. Depending on the options specified, the date would set the date and time or print it in a user-defined format. However, how do you get yesterdays with bash? What about tomorrows day? I have seen many sysadmins writing Perl scripts for calculating…
How do I install a LAMP stack on Debian 10 (Buster)?The LAMP is an acronym for software stack that includes Linux, Apache web server, MariaDB database (MySQL drop in replacement), and PHP web scripting language. A LAMP stack allows us hosting dynamic websites and popular apps such as MediaWiki, WordPress, and more. This page shows…
How do I remove and delete a UFW firewall rule running on Ubuntu or Debian Linux?UFW is an acronym for an uncomplicated firewall. Securing a network with the uncomplicated firewall is super easy. The Ubuntu Linux comes with packet filtering called Netfilter. The iptables frontend command used to manage netfilter. However, ufw provides easy to…
I am a new Linux system user. How do I copy a directory or folder under Linux operating system using command line options and bash shell?Introduction: A file is a collection of data items stored on disk. Alternatively, it’s device which can store the information, data, music (mp3/mp4 files), picture, movie, sound, book and more….
I have downloaded a file called foo.tar.gz from the Internets. How do I extract tar.gz file under Linux / UNIX like operating systems using command line options?A tarball (tar.gz file) is nothing but compressed tar archive. The tar program provides the ability to create tar archives, as well as various other kinds of manipulation. For…
I have Debian 9.x installed on AWS EC2. How do I upgrade Debian 9 Stretch to Debian 10 Buster using the apt command/apt-get command CLI? How can I upgrade Debian 9 to Debian 10 using ssh client?Debian Linux 10 “Buster” released. The new version offers updated packages and five years of support. In this release,…
How do I check CPU temperature in OpenSUSE Linux using a command line and GUI tools on my Thinkpad laptop?One of the most common complaints is the overheating laptop, especially older models. Laptop components are tightly put together to each other. So there is very little room for air movement in thinner laptops. If your…
I set up a brand new Fedora Linux server in the cloud. How can I install and setup LXD on Fedora Linux? How do I create my first VM using LXD?Linux container is an implementation of operating system-level virtualization for the Linux operating system. LXD is a system container manager. You get an experience similar…
I am using Lenovo laptop. I want to update my BIOS but do not have Windows installed my system. How do I update Lenovo BIOS from Linux without using MS-Windows operating system with the help of a USB stick?This tutorial shows how to update the BIOS on a Lenovo ThinkPad that only runs Linux operating…
I am trying to delete a directory in Linux using the rmdir dir1 command. But, I am getting an error that read as follows: rmdir: failed to remove `dir1′: Directory not emptyHow do I force remove and delete a directory in Linux?A directory is nothing but a location for storing files on the Linux operating system…