How do I permanently modify the kernel command line in RHEL5 and RHEL6?

Environment

• Red Hat Enterprise Linux 6
• Red Hat Enterprise Linux 5
• GRUB

Issue

• How do I permanently change the kernel command line (and, thus, the kernel boot parameters) in Red Hat Enterprise Linux 5 and 6?

Resolution

• In the /boot/grub/grub.conf file, modify the kernel lines as needed.

• Please see the following documentation for more information:

  • RHEL6 Installation Guide: ⁠E.8. GRUB Menu Configuration File
  • RHEL6 Deployment Guide: ⁠30.6.1. Configuring the GRUB Boot Loader

Diagnostic Steps

• For RHEL7, please see: How do I permanently modify the kernel command line in RHEL7?

• To make a one-time, non-persistent change at boot, please see: How to manually modify the boot parameter in grub before the system boots

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