Linux /boot: Out of Disk Space While Installing Package kernel-2.6.32-131.2.1.el6.x86_64

Posted on in Categories last updated June 8, 2011

I‘m trying to install RHEL 6 kernel updates and patches using the yum command and getting the following error:

Transaction Check Error:
  installing package kernel-2.6.32-131.2.1.el6.x86_64 needs 8MB on the /boot filesystem

Error Summary
Disk Requirements:
  At least 8MB more space needed on the /boot filesystem.

How do I fix this error and install RHEL kernel without increasing /boot size or reinstalling the operating system?

Linux nice command: Run Process With Modified Scheduling Priority ( nicenesses )

Posted on in Categories , , , , , , , , , last updated February 26, 2008

Q. How do I run a process with modified scheduling priority under Linux? I’d like to change the priority in the kernel’s scheduler while starting a command.

A. Use nice command to run a program with modified scheduling priority / nicenesses. Nicenesses range at least from -20 (resulting in the most favorable scheduling) through 19 (the least favorable). The default behavior is to increase the niceness by 10.

A niceness should not be confused with a scheduling priority, which lets applications determine the order in which threads are scheduled to run. Unlike a priority, a niceness is merely advice to the scheduler, which the scheduler is free to ignore.

nice syntax (/bin/nice command)

/bin/nice -n NUM

Add integer NUM (-20 to 19) to the niceness.

WARNING! There are multiple versions of the nice command. One built in to the shell, and one in /bin/nice. The syntax may be diffrent on your system. Refer your shell and /bin/nice command man page for details.

Change niceness by 3

Type the command as follows:
$ /bin/nice -n 3 command-name

Only a privileged user may run a process with lower niceness:
$ /bin/nice -n -1 command-name

Shell in build nice command syntax

If you use the csh or tcsh or bash, the syntax is as follows:
nice +n command
I recommend using /bin/nice syntax to avoid confusion and to save time.