Monthly Archive: June, 2013

sysctl – runtime kernel options

GEEKS !! Here goes a problem. Something happened on my Linux machine and I am not able to execute … say .. #sysctl command, correctly Hope you remember this command and your #rhce training days. Now I… Continue reading

inittab explained

GEEKS !! Forgive me this time for taking up /etc/inittab file details here. But trust me, many of you will learn something new about inittab file apart from your knowledge that it control… Continue reading

Encrypt files using gpg

GEEKS!! I know you have used the gpg keys while in your RHCE Training and the topic also comes in RHCSS, RH333 objectives. But there you have used the gpg with the signature… Continue reading

Update Time Automatically using NTP

GEEKS!! I know you all know what is NTP and its purpose. I hope you still remember your RHCE training. But here I am sharing with you a very small trick that will make sure… Continue reading

SSH Session Controlled

GEEKS !!! Remember ssh. Yes same ssh using which you restarted or shutdown your classmate machines during your RHCE Training. Now, Encounter this. You are doing some important and lengthy task on some… Continue reading

Chrooted Services

GEEKS !! You always hear about running services in “chroot” environment will help securing those services. Ever asked, how and why? Lets understand how a “chrooted” environment for a service help admins to… Continue reading

Disabling Unused Services Linux

GEEKS !! We all are being taught not to start, or stop un-necessary services from our production Linux servers, as a BASIC RULE OF THUMB for securing your servers. Right from our RHCE… Continue reading

Preserving History Across Terminals

Configure your Linux Server to preserve history of all the commands executed across different terminals. A very useful tip or hack for troubleshooting some problem and for diagnostic purposes also, where you intend… Continue reading

crontab inside story

GEEKS !! Hope you still remember putting crontab for users during your Red Hat Training. Here come some important facts about crontab. I know, you know. But read it, you might find them… Continue reading