Minimum & Maximum UID’s

GEEKS !! Here comes a very small but relevant information about user accounts. Often asked in interviews. We all know that whenever we create user account on Linux machines during your RHCE Training… Continue reading →

Active FTP vs Passive FTP

GEEKS !! I know you hate learning on Sunday’s. But this one worth a read. Lets once again understand the basics of FTP Server. You should be knowing more than just installing the… Continue reading →

Strong Passwords Linux

GEEKS !!! Though you are generally not in a mood to study on Sunday’s. But here comes a very interesting tip. Tip to strengthen the password rules so to avoid “dictionary based attacks”… Continue reading →

Memory Usage under Linux

GEEKS !! Welcome back after a really long “Diwali” holiday. Lets start with something very interesting. Lets understand in depth the memory usage of process in Linux. I know .. I know you… Continue reading →

IPTables to limit number of simultaneous connections

Forget Monday Blues !!! Read a small tip about limiting number of simultaneous connections from a host to a particular service. We can use IPTables to limit number of simultaneous connections from a… Continue reading →

Use netstat for view routing cache

You know, you can use netstat command to view the routing cache. Can be useful for diagnostic purpose. netstat -rnC Here is the screenshot from my machine.

Check httpd.conf for syntax errors

So you are finished editing your httpd.conf file. Before restarting or reloading your httpd service you might want to check the syntax of the httpd.conf for any errors.  Like we have “named-checkconf” in… Continue reading →

View distribution specific information

You can use “lsb_release” command to view the distribution specific information.  Below is a screen from my machine, using lsb_release with different options. Feel free to use man pages of lsb_release.

Use “stat” command to get information about file and filesystem

You know you have a “stat” command, that can be used either to check the status or properties of a single file or a entire filesystem. It displays file or file system status… Continue reading →

RHCSA/RHCE exam result of 16/03/2012

Congrats to ALL students.