Linux
7 ways to prevent brute force SSH attacks in Linux (CentOS/RHEL 7)
A brute-force attack consists of an attacker submitting many passwords or passphrases with the hope of eventually guessing correctly. The attacker systematically checks all possible passwords and passphrases until the correct one is found. In this ar
2 ways to backup and restore partition table in Linux (CentOS / RHEL 7)
In my last article I gave you an overview on Public key Infrastructure (PKI) and shared the steps to generate a self signed certificate using openssl in Linux. Next let me show you the steps to copy partition table from one disk to another or backup
Basics OpenLDAP Tutorial for Beginners – Understanding Terminologies & Usage
This is a multi-part article where I will cover different areas of configuration of OpenLDAP server in CentOS 7 Linux node. You can use below links to refer different parts of this tutorialBasics LDAP Tutorial for Beginners – Understanding Termin...
How to improve disk IO performance in Linux
In my last article I gave an overview on SystemTap to help you trace and debug kernel modules, Now here before we understand on how to improve disk IO performance, we should understand the basics of IO flow in the Linux environment. &nbs
Security
6 openssh authentication methods to secure connection with sshd_config
The SSH protocol (aka Secure Shell) is used to establish secure and reliable communications between ...
How to configure ssh host based authentication per user (CentOS/RHEL 7/8)
In this article I will share the steps to configure Host based authentication in sshd_config and ssh
How to change LUKS device master key, cipher, hash, key-size in Linux
In this article I will share the steps to change LUKS device master key, cipher, hash and key-size.
Configure LUKS Network Bound Disk Encryption with clevis & tang server
In this article I will share the steps to configure CentOS/Red Hat Network Bound Disk Encryption (NB
10 basic & powerful commands to check file system type in Linux/Unix
Any operating system must be able to access and manage files on storage devices; however, the manner...
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Bridged vs Internal vs NAT vs NAT Network vs Host Only Network - Oracle VirtualBox - Part 1
14:56
Bridged vs Internal vs NAT vs NAT Network vs Host Only Network - Oracle VirtualBox - Part 2
11:22
Configure BIND-9.8 DNS Server in Red Hat Linux 6
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OpenStack
How to install multi node openstack on virtualbox with packstack on CentOS 7
In this article I will share the steps to install multi node OpenStack on VirtualBox using CentOS 7 ...
Understanding nova compute architecture basics in Openstack (flow chart)
Earlier I had shared an article with the steps to configure ceph storage cluster in OpenStack. Now l
Cinder vs Swift storage in OpenStack – Basic Difference and Comparison
Earlier I had shared an article with the steps to configure ceph storage cluster in OpenStack. Now l
Step-by-Step Tutorial: Install Docker on CentOS 7 with LVM Thin Provisioning
In my last article I shared the steps to configure or build ceph storage cluster in Openstack. Now i
Latest Articles
10 basic & powerful commands to check file system type in Linux/Unix
Any operating system must be able to access and manage files on storage devices; however, the manner in which the files are organized on a storage dev...
6 openssh authentication methods to secure connection with sshd_config
The SSH protocol (aka Secure Shell) is used to establish secure and reliable communications between two hosts. It supports different ssh authenticatio
How to configure ssh host based authentication per user (CentOS/RHEL 7/8)
In this article I will share the steps to configure Host based authentication in sshd_config and ssh_config for Linux server and client and a comparis
How to change LUKS device master key, cipher, hash, key-size in Linux
In this article I will share the steps to change LUKS device master key, cipher, hash and key-size. Now due to security reasons you may get a requirem
Configure LUKS Network Bound Disk Encryption with clevis & tang server
In this article I will share the steps to configure CentOS/Red Hat Network Bound Disk Encryption (NBDE). In our earlier articles we studied
How to encrypt root partition and entire file system using LUKS in Linux
During scratch installation of Red Hat or CentOS, you can select the checkbox to encrypt all the available disks but it is also possible to encrypt ro...