• VMware

    Learn about VMware virtualization for its products like vsphere ESX and ESXi, vCenter Server, VMware View, VMware P2V and many more

  • Linux

    Step by step configuration tutorials for many of the Linux services like DNS, DHCP, FTP, Samba4 etc including many tips and tricks in Red Hat Linux.

  • Database

    Learn installation and configuration of databases like Oracle, My SQL, Postgresql, etc including many other related tutorials in Linux.

  • Content


    2018

    May

    How to execute a script at %pre, %post, %preun or %postun stage (spec file) while installing/upgrading an rpm
    How to sign a key using gpg key (password or password-less) to an rpm in Linux
    How to change rpmbuild (_tmppath) in a spec file (rpmbuild ignored directory) Linux
    How to build a signed rpm from scratch by building a source archive using Red Hat Linux
    How to view and increase the default pipe buffer size in Linux (F_GETPIPE_SZ, F_SETPIPE_SZ)
    How to reduce and/or add more columns or fields to top command in Linux (swap, memory, etc)
    How to disable or restrict direct root login via console or ssh
    How to clear/delete all the partition table from a disk or partition in Linux

    April


    March

    Best practices to harden and increase security with ssh (ciphers, MACs etc)
    Step by Step Guide to Install and configure VCSA 6.5 with Embedded Platform Service Controller
    How to reset iLO4 password remotely using Onboard Administrator
    Step by step tutorial guide with screenshots to Install and Configure VMware ESXi 6.5

    February

    How to make bootable Pendrive (USB) to install Windows, Linux, VMware from an ISO
    How to set date and time in iLO3 / iLO4 using SNTP and RIBCL scripts from Onboard Administrator in HP Proliant Blades
    HP iLO4 command line interface (CLI) guide and cheatsheet with examples
    How to configure Shared Uplink Set Network in HP Flex Virtual Connect using CLI commands with example (cheatsheet)
    How to configure NTP client to sync with NTP server during system startup (boot) in (RHEL 7 / CentOS 7) Linux
    Step by Step Guide to create autoyast xml file for SuSE Linux (SLES) with examples
    what is the difference between sub-query and co-related sub-query?
    How to change or customise login prompt for ksh shell in Linux (with examples)
    Step by Step tutorial guide to configure BIND DNS server in chroot environment for Red Hat (RHEL/CentOS) 7
    How to customize and change color of the bash login prompt in Linux
    10 examples to customize or change the login prompt using PS1 variable of bash shell in Linux

    January

    How to check and update planned day light saving (DST) changes (timezone) in Linux
    How to assign a service to a specific core using systemd in RHEL 7 / CentOS 7
    How to disable or enable hyper threading on my Linux server
    How to limit CPU count or disable CPUs in a multi core server in RHEL 7 / CentOS 7
    How to check if Hyper Threading (HT) is enabled or disabled on my Linux server
    How to clean temporary files automatically using systemd-tmpfiles in RHEL 7 / CentOS 7
    How to create a user (normal and root) using kickstart configuration file in RHEL 7 / CentOS 7
    How to create a sequence which start with 1 and next value will be 0 and then next value is 1 and then 0 .. and so on ... is this possible ?
    How to boot RHEL 7 / CentOS 7 to single user runlevel or rescue mode (emergency.target) ?
    Tutorial / Cheatsheet:12 practical examples for different sudo access based scenarios in RHEL 7 / CentOS 7
    Tutorial/Cheatsheet: 11 examples to use systemctl to manage unit files and service in RHEL 7/CentOS 7
    Understanding syntax, arguments, aliases used in sudoers file with examples (visudo)


    2017

    December

    Step by Step Linux boot process with GRUB2 and systemd in RHEL 7 / CentOS 7
    How do I set or change (default) runlevel using systemd in CentOS 7/RHEL 7
    Host gets stuck at certain percentage while entering maintenance mode in Full Data Migration (VMware, vSAN)
    How to use iperf3 tool to monitor network bandwidth in Linux
    sed: add or append character at beginning or end of line (row) of a file
    sed: Ignore whitespace while matching a pattern
    How to fix "Postponed keyboard-interactive for invalid user <username> from <host> port <port_no> ssh2 [preauth]"
    How to print or grep only the matched string or text or word or pattern in Linux using bash
    How to forcefully sync date and time using the NTP server in Linux
    How to redirect specific log messages to separate log file using rsyslog in Linux
    How to find ethernet network card firmware and driver information in Linux

    November


    October


    September


    August


    July


    June


    May


    April


    2016

    September


    April



    2014


    October


    September

    How to do a case sensitive search inside vi editor in Linux
    How does a successful or failed login process works in Linux
    How to find all the process accessing a file in Linux
    How to exclude multiple directories from du command in Linux
    How to configure autofs in Linux and what are its advantages?
    How to resize software raid partition in Linux
    Step by step guide to configure software raid 1 (mdadm)
    How to prevent a command from getting stored in history in Linux

    June

    Comparison and Difference between vSphere 5.1 and 5.5
    How to run any script or cron job in Linux for every second
    Linux General and Permission (QUIZ)
    Oracle Database (QUIZ)
    Linux User and Accounts Management (QUIZ)
    Installing Linux and Linux Kernel (QUIZ)
    How to keep a track of all the commands run by any user in Linux
    How do you check Linux machine is Physical or Virtual remotely?
    df shows 100% full partition even when there is space on the disk
    How to configure passwordless sudo for a user in Linux
    Understanding Load Average in Linux and when to be worried about it?
    How to run a process in background or bring to foreground in Linux
    How to configure logrotate for a new log file in Red Hat Linux
    How to secure boot loader (grub menu) with password in RHEL 6
    Disk Attachment Technology FC vs SAS vs iSCSI

    May


    April

    Overview of services used in Red Hat Cluster
    How to find/view all the members of a group in Linux
    10 practical examples to use USERADD command in linux
    What is the difference/comparison between Unix and Linux ?
    How to fix "E575: viminfo: Illegal starting char in line"
    What are the maximum and minimum limits for RHEL 4 vs 5 vs 6 ?
    RAID levels 0, 1, 2, 3, 4, 5, 6, 0+1, 1+0 features explained in detail
    VMware Workstation throws internal error when powering on VM
    10 Practical Examples for using FIND Command in Linux

    March

    How to rename Logical Volume and Volume Group in Linux
    Step by Step Linux Boot Process Explained In Detail
    How to remove logical and physical volume from Volume Group in Linux
    What is the difference between ext3 and ext4 filesystem in Linux ?
    How to change default login shell permanently in linux
    How to install libraries manually in Linux
    How to extend/resize Logical Volume and Volume Group in Linux
    How to generate ER diagram using Oracle SQL developer
    What is GRUB Boot Loader ?
    How to configure BIND-9.8 DNS server in Red Hat Linux 6
    Existing lock /var/run/yum.pid: another copy is running
    How to configure a caching only bind DNS server in Red Hat Linux
    Iptables rules to allow/block ssh incoming/outgoing connection in Linux
    Iptables rules to block/allow icmp ping request in Linux
    How to configure Private Network in VMware Workstation
    10 examples to help you understand top command usage in Unix/Linux
    Script to take backup of any critical directory in Unix/Linux

    February

    Configure Red Hat Cluster using VMware, Quorum Disk, GFS2, Openfiler
    Tutorial for Monitoring Tools SAR and KSAR with examples in Linux
    How to configure Samba 4 Secondary Domain Controller
    RHEL: Kernel will not boot, system freeze at 'starting udev'
    How to secure Apache web server in Linux using password (.htaccess)
    How to register Red Hat Linux with RHN (Red Hat Network )
    Red hat Enterprise Linux 5.5 Installation Guide (Screenshots)
    15 tips to enhance security of your Linux machine
    Why is Linux considered more safer than windows or any other OS ?
    What is the difference between "su" and "su -" in Linux?
    What is kernel-PAE in Linux?
    What is swappiness and how do we change its value?
    How to log iptables messages in different log file
    What are the s and k scripts in the etc rcx.d directories
    How to check all the currently running services in Linux
    How to auto start service after reboot in Linux
    What is virtual memory, paging and swap space?

    January

    Interview Questions on Linux Servers with Answers
    What is the difference between DNS A record and CNAME record?
    Tutorial for SYSLOG with Examples in Red Hat Linux
    General Linux Interview Questions with Answers
    Interview Questions on Linux Permissions with Answers
    Interview Questions on Linux Networking
    Interview Questions on Linux User management with Answers
    Interview Questions on Linux Filesystems with Answers
    What is a Kernel in Linux?
    How does a DNS query works when you type a URL on your browser?
    How to create password less ssh connection for multiple non-root users
    How to create user without useradd command in Linux
    How to unlink/delete a symbolic in Linux
    How to give normal user root privileges using sudo in Linux/Unix
    How to do Ethernet/NIC bonding/teaming in Red Hat Linux
    How to install/uninstall/upgrade rpm package with/without dependencies



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    August

    Content Content Reviewed by Deepak Prasad on Sunday, May 13, 2018 Rating: 5
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