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grub boot loader

CentOS / Redhat: Turn On SELinux Protection

SELinux enforces the idea that programs should be limited in what files they can access and what actions they can take. However, by default it is turned off under RHEL / CentOS 5.x server? How do I turn it on? How can I enable SELinux on CentOS / RHEL 6 IBM server?
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How do I configure and enable console redirection in the BIOS? I want see my remote dedicate server boot information and any diagnostic information that is normally printed to the screen. I've already enabled serial ports in my server BIOS and wired them up. Now how do I configure and access Linux over a serial console?
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Q. After windows XP installation I lost my Grub boot loader and now when I try to run grub-install command to restore Grub in master boot record. But I am getting an error that read as follows:
/dev/sda does not have any corresponding BIOS drive

How do I fix this problem?

A. grub-install is use to install GRUB on your drive. If you are getting error try to recheck device map.

Type the command as follows:
# grub-install --recheck /dev/sdaWhere,

  • --recheck: Probe a device map even if it already exists
  • /dev/sda : Replace /dev/sda with your actual device name.

Above command should fix the problem.

See also