Setting Password for Single User Mode in Linux adds security to Linux boxes. If someone accesses your server physically & reboots the server and then tries to change the root password from single-user mode. In that case, if the password is set on single-user mode, one has to first enter the root password, then only […]
CentOS/RHEL
ttyrec – Record Terminal Session in Linux
ttyrec is a tty(terminal) recorder in a Unix-like operating system & recorded data can be played back with the help of ttyplay command. ttyrec is just a derivative of script command for recording timing information with microsecond accuracy as well. It can record emacs -nw, vi, lynx, or any programs running on tty. Installation on […]
SSHFS (Secure SHell FileSystem) – Securely Mount remote filesystem over ssh
In Linux like operating systems, we can securely mount a remote file system over ssh protocol using sshfs command. SSHFS stands for Secure SHell FileSystem. SSHFS enables us to mount the remote file system and interact with remote directories and files on a local machine. On the local computer where the SSHFS is mounted, the […]
Detect rootkits & malware on Linux Servers using rkhunter
Rkhunter stands for RootkitHunter. It is an open-source scanner software or a shell script in a UNIX-like operating system that detects known rootkits and malware on Linux servers. It also performs checks to see if commands have been modified, if the system startup files have been modified, and various checks on the network interfaces, including […]
Patch Management of Linux Servers Using Spacewalk
In this tutorial, I am assuming that the Spacewalk server is already installed & Configured. Click Here to go through the spacewalk installation steps. In my scenario I have more than 100 Linux Servers (Centos 6), I will do the patching using the spacewalk tool. For this, I have to register all Linux servers in […]
12 RPM (Red Hat Package Manager) Command Examples
RPM is an open-source Package Manager on Linux Like Operating systems (RHEL, CentOS & Fedora).RPM command is used to build, install, query, verify, update and erase individual software packages. RPM utility only works with packages that are built on .rpm format. An RPM file contains not only the software files but also in-depth information about […]
How to add Swap Space on Linux Servers (CentOS/RHEL) On the Fly
In Most of the UNIX-like operating systems, the swap partition is created during the installation time, However, with kernel 2.6 swap files can be used as a swap partition. The administrative flexibility of swap files outweighs that of partitions; since modern high-capacity hard drives can remap physical sectors, no partition is guaranteed to be contiguous. […]
Spacewalk Installation Steps On CentOS/RHEL
Spacewalk is an open-source configuration management tool sponsored by Red Hat. Spacewalk is an alternate of the Redhat network satellite server on Centos/Fedora/Scientific Linux. Spacewalk is the upstream project for the source of the Red Hat Network Satellite. It provides a management interface for software content across registered servers. Some of important Features of Spacewalk […]
Yum Command – RPM Based Package Management Utility
What is Yum? YUM Stands for Yellowdog Updater Modified. YUM is an interactive, rpm-based package manager. Yum is available in different Linux OS Like Redhat, Centos, Fedora, etc. It can also perform installation of new packages, removal of old packages, and perform queries on the installed and/or available packages among many other commands/services. Yum Solves […]
Difference Between Qemu and KVM
Qemu It is a generic and open-source machine emulator and virtualizer. When used as a machine emulator, QEMU can run OS and programs made for one machine (e.g. an ARM board) on a different machine (e.g. your own PC). By using dynamic translation, Qemu achieves very good performance. Some of the Important Features are mentioned […]