Recent Articles

8 Options to Trace/Debug Programs using Linux strace Command

8 Options to Trace/Debug Programs using Linux strace Command

The strace is the tool that helps in debugging issues by tracing system calls executed by a program. It is handy when you want to see how the program interacts with the operating system, like what system calls are executed in what order. This simple yet very powerful tool is available for almost all the […]

August 18, 2014 | By in LINUX COMMANDS, MONITORING | Reply More
How to Change Hostname in RHEL / CentOS 7.0

How to Change Hostname in RHEL / CentOS 7.0

You have probably needed to change the hostname of your CentOS 7 install for one reason or the other. Changing the hostname in CentOS 7 is now much simpler than ever. If you are ready open up your terminal and follow through this tutorial, and in less than 10 minutes you will have changed your […]

August 16, 2014 | By in LINUX COMMANDS, LINUX HOWTO | Reply More
Linux Systemd - Start/Stop/Restart Services in RHEL / CentOS 7

Linux Systemd - Start/Stop/Restart Services in RHEL / CentOS 7

One of the major changes in RHEL ¬†/ CentOS 7.0 is the swtich to systemd, a system and service manager, that replaces SysV and Upstart used in previous releases of Red Hat Enterprise Linux. systemd is compatible with SysV and Linux Standard Base init scripts. Systemd is a system and service manager for Linux operating […]

August 15, 2014 | By in LINUX COMMANDS, LINUX HOWTO | Reply More
A Pocket Guide for Linux ssh Command with Examples

A Pocket Guide for Linux ssh Command with Examples

If you have been in the IT world for quite some time you probably have heard about SSH, how great a tool it is and all its cool security features. In this tutorial you will learn how to use SSH in a few minutes and login to your remote computers seamlessly and securely. If you […]

Firewalld - How to Dynamically Manage Firewall in RHEL/CentOS 7.0

Firewalld - How to Dynamically Manage Firewall in RHEL/CentOS 7.0

Fedora 17/RHEL/CentOS 7 introduces a new firewall daemon called¬†FirewallD, a dynamically managed firewall that supports zones to define the trust level of network connections or interfaces. Because FirewallD runs as a daemon it also allows rules to be added instantly without the need of a complete firewall (iptables) restart that can cause breaking stateful firewalling […]

August 11, 2014 | By in FIREWALL | Reply More