Linux Screen Tutorial In this Linux Screen tutorial you will learn how to install screen on CentOS, Ubuntu, and how to use Linux screen command with examples. Official GNU Screen man pages. Or: #man screen What is GNU… Continue Reading
How to fix wget ERROR: The certificate of ‘ ’ is not trusted How to fix wget command error in Debian or Ubuntu: ERROR: The certificate of ‘ ’ is not trusted. ERROR: The certificate of ‘ ’ hasn’t got… Continue Reading
Media change: please insert the disc labeled ”Debian GNU/Linux In case if Debian cannot found CD-ROM or DVD with Debian packages yo may have error: Media change: please insert the disc labeled ‘Debian GNU/Linux 9.11.0 _Stretch_ – Official amd64 DVD… Continue Reading
5 Great Linux Disk IO monitoring tools Below you see my favorite best 5 Linux Disk IO Monitoring Tools. IOTOP iotop Linux is a simple top-like disk I/O monitor tool. iotop command watches I/O usage information output by the… Continue Reading
After installing sysstat package and running sar command you may have error message: “Cannot open /var/log/sysstat/sa18: No such file or directory. Please check if data collecting is enabled”. I will show how to fix that error on Ubuntu and CentOS… Continue Reading
How To Reset Openfire Admin Password If you forgot Openfire admin password this tutorial will help you step by step Reset Openfire admin password from Linux command line. 1. Stop Openfire Stop Openfire service by command: # service openfire… Continue Reading
How To Enable Root SSH On Ubuntu and CentOS By default on Ubuntu server root SSH disabled for security reasons. That means you can login as user then use sudo to became root. In this article I will show… Continue Reading
5 Great Commands to Monitor Network Bandwidth on Linux Server Linux network traffic monitoring is one of the main parts of Linux troubleshooting. And can be done by many network monitoring utilities. In this article we will discover 5… Continue Reading
Docker Tutorial. Create Docker Image From Dockerfile In this docker tutorial I will show simple example how to create docker image from Dockerfile step by step. Also I will how build docker image from scratch. If Docker already installed in… Continue Reading
6 Linux lsblk Command Examples lsblk useful terminal command for analysis Linux storage devices. lsblk – LiSt BLocK devices. Linux lsblk command lists information about all available or the specified block devices – disks. The lsblk command reads the… Continue Reading