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Sunday, September 30, 2018

Rate limit SSH access using IPTables/Firewalld to counter Brute Force attacks.

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Hello Guys, The Public IP ranges of Cloud Platforms like Amazon AWS, Oracle OCI, Microsoft Azure are published in Public. If you have an ...
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Thursday, October 23, 2014

Bash interpreting a Command

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By default bash is the default shell in Linux. Lets see how bash shell interprets the command we type in. It not as simple as checki...
Tuesday, October 7, 2014

Disk Metadata : Superblock, Directory and Inodes

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Metadata Filesystem blocks are user for 2 purposes : To store User data and Metadata User data - stores actual data contained in fi...
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Monday, April 28, 2014

Recover deleted files used by any process in Linux from RAM memory.

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Every thing in Linux is a File. A file in turn is actually a pointer to inode which contain the actual data on the disk, permissions, owne...
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Tuesday, April 8, 2014

Sendmail Error : NOQUEUE: SYSERR(root): No local mailer defined NOQUEUE: SYSERR(root): QueueDirectory (Q) option must be set

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Error using m4 macro while building sendmail.cf from sendmail.mc on RHEL 6 / CentOS 6 flavors? [root@cent1]# m4 /etc/mail/sendmail.mc...
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Change Default MTA in RHEL 6 / Cent OS 6

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By default Postfix is set as the default mail transfer agent in Redhat Enterprise Linux 6 and Cent OS 6 flavors. However you can change t...
Thursday, October 10, 2013

How to configure Veritas Volume Manager VxVM 6.0.2

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The disks should be discovered by OS before it can be added to Veritas Volume Manager. 1. List the disks detected by VxVM. # vxdisk -o alld...
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