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… 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
Ubuntu 18.04 LTS Set Hostname Permanently In this article I will show how to set hostname in Ubuntu server 18.04 permanently. Lets say my server old hostname is: serv and should be changed to: serv1. Ubuntu Server 18.04 Set… Continue Reading
How to fix error: add-apt-repository: command not found on Ubuntu This tutorial about how to easy fix error: add-apt-repository: command not found on Ubuntu or Debian Linux systems. When you adding a new PPA repository in your Ubuntu or Debian… Continue Reading
Useful Netcat Examples In this netcat tutorial you can see useful netcat examples to help you use this powerful tool. Netcat (nc – in short) can be called “Swiss army of knife” in Linux network terminal utilities. Netcat can be… Continue Reading
SSH Jump Host Jumphost or jumphost servers are intermediaries between the high security zone and the DMZ zones. And provide transparent control of devices in the DMZ zone. Of course jump host should be highly secured for preventing access to… Continue Reading
VsFTPd Passive Mode Enable If you don’t have already installed vsftpd on your Linux see article: How to Install vsftpd Server on CentOS. To enable vsftpd Passive Mode in Linux edit vsftpd config file: vsftpd.conf. Open with your favorite text… Continue Reading
How To Test Internet Speed On Linux VPS To get internet speed from command line Linux VPS we can use Python utility from SPEEDTEST – Speedtest-cli. Speedtest-cli is a script developed in Python programming language. Lets download SPEEDTEST utility from… Continue Reading
How To Generate Self-Signed TLS Certificate TLS (Transport Layer Security)is cryptographic protocol for providing secure communications. To Generate Self-Signed TLS Certificate login as root user. Create certs directory. # mkdir /root/certs # cd /root/certs Generate certificate with openssl command line… Continue Reading
Ubuntu 18.04 Set Static IP Ubuntu 18.04 LTS Server using new IP addresses configuring method. For network configuration Ubuntu 18.04 uses Netplan Netplan’s configuration files use the YAML format. Netplan configuration files can be found in: /etc/netplan/ directory. In this… Continue Reading