Linux / Unix: OpenSSH Multiplexer To Speed Up OpenSSH Connections

H ow can I multiplex SSH sessions by setting up a master session and then having subsequent sessions go through the master to speed up my ssh connection on a Linux or Unix-like operating systems?…

How To Patch and Protect Linux Server Against the VENOM Vulnerability # CVE-2015-3456

A very serious security problem has been found in the virtual floppy drive QEMU’s code used by many computer virtualization platforms including Xen, KVM, VirtualBox, and the native QEMU client. It is called VENOM vulnerability.…

How to run sudo command without a password on a Linux or Unix

I ‘m a new Unix system user. How do I use sudo command without a password on a Linux or Unix-like systems? I log in as tom@my-cloud-server-ip and disabled root login for ssh. After login,…

Linux exit from lxc-console keyboard shortcut

I ‘m using Debian Linux server with Linux Containers (lxc). How do I disconnect and exit from an lxc-console to a shell prompt without closing ssh session?   You need to use the lxc-console command…

Debian/Ubuntu Linux: Restrict an SSH user session to a specific directory by setting chrooted jail

I setup a web-server. I need to grant a user ssh access but I do not trust users. How can I limit user session to a specific directory such as /home/httpd/$USERNAME? How do I set…

How To Setup a LAMP Server on Debian Linux 8 (Jessie)

H ow can I setup up a LAMP (Linux, Apache, MySql, PHP) stack on Debian Linux version 8 (Jessie) using command line options?   Setting up a LAMP stack on your Debian 8 server will…

How to update Debian or Ubuntu Linux containers (lxc) VM

I ‘m using LXC (Linux Containers) a virtualization system running on a Ubuntu LTS. How can I update all my Ubuntu or Debian Linux based guests containers VM from host operating system?   Container is…

Debian 8 and Ubuntu 14.04 LTS Install Suhosin PHP Extension To Protect Your Server

S uhosin is an advanced protection system for PHP installations. It was designed to protect servers and users from known and unknown flaws in PHP applications and the PHP core. How can I install suhosin…

How To: Ubuntu Linux Firewall Open Port Command

H ow do I open port 80 and 443 on a Ubuntu Linux LTS version 14.04 server?   Ubuntu Linux server comes with firewall configuration tool called ufw (Uncomplicated Firewall). It is the default tool.…

How to make a folder in Linux or Unix

I am a new Linux user. How do I make a folder in Linux or Unix system using the CLI?   You need to use the mkdir command to create new directories or folders in…