How to create customized bootable ISO image in RHEL/CentOS 7

I have written separate articles with detailed steps to create a user with encrypted password using kickstart file, or to perform interactive installation using kickstart file and with the steps to save the %pre installation logs as unless you save them, the pre installation logs would be deleted once the installation is successful. For the ... Read more How to create customized bootable ISO image in RHEL/CentOS 7

How to Fix "Informational Exchange message must be encrypted"

This is the error you might get while configuring Openswan. As I received this error when I was configuring openswan to connect my sonicwall vpn. Error: #1: Informational Exchange message must be encrypted Solution: Make sure you have set these parameters in your Sonicwall  IKE (Phase 1) Proposal DH Group: Group 5 (not 2) Encryption: ... Read more How to Fix "Informational Exchange message must be encrypted"

Openswan configuration on Red Hat5 for Sonicwall

Openswan configuration on Red Hat5 for Sonicwall

I really had to struggle a lot to properly configure Openswan on my Red Hat Linux machine so that I can connect to my Sonicwall firewall. Well for others I will leave the steps and will also provide the links of different pages where you can look for a solution for any error they get ... Read more Openswan configuration on Red Hat5 for Sonicwall

Linux Kernel boot time Optimization

Linux Kernel boot time Optimization

Present state of Linux kernel booting process itself is highly optimized. I mean that there is no major deficiency in kernel loading architecture (as it is mostly serialized/linear) and little/no can be changed.  startup assembly code (setting up clk,cpu and soc registers) ->  detect memory layout, detect display, setup mmu, setup interrupt  table, enable paging ... Read more Linux Kernel boot time Optimization