At least 250MB more space needed on the /boot filesystem

This means /boot partition is out of disk space. You can verify this with the df command itself, enter:

# df -H /boot


To fix this problem deleted all old kernel. To list all installed kernel, enter:

# rpm -qa | grep kernel

Sample outputs:

  kernel-2.6.32-71.el6.x86_64
  kernel-2.6.32-71.29.1.el6.x86_64
  kernel-2.6.32-131.0.15.el6.x86_64

Erase older version, enter:

# rpm -e kernel-2.6.32-71.el6.x86_64 kernel-2.6.32-71.29.1.el6.x86_64
# df -H /boot

Now, try installing the new updated kernel:

# yum -y update kernel


Also apply other updates from RHN, enter:

# yum -y update


Finally, reboot the system, enter:

# reboot

 

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