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How to modify the GRUB2 default entry to boot a different Kernel version? 1. Check the current running Kernel Version # uname -a Linux geeklab 3.8.13-94.el7uek.x86_64 #2 SMP Wed Feb 11 14:18:22 PST 2015 x86_64 x86_64 x86_64 GNU/Linux 2. List the Kernel Entries as per GRUB2 file: # awk -F\' '$1=="menuentry " {print $2}' /etc/grub2.cfg Oracle Linux Server, with Unbreakable Enterprise Kernel 3.8.13-94.el7uek.x86_64 Oracle Linux Server, with Unbreakable Enterprise Kernel 3.8.13-94.el7uek.x86_64 with debugging Oracle Linux Server 7.1, with Linux 3.10.0-229.el7.x86_64 Oracle Linux Server 7.1, with Unbreakable Enterprise Kernel 3.8.13-55.1.6.el7uek.x86_64 Oracle Linux Server 7.1, with Linux 0-rescue-441e86c9ff854310a306bd33e56aae2b NOTE: The first entry is denoted as Zero. So currently the Server is booted to 0th entry as per the above `uname -a` command output. 3. Let us modify the Kernel Version to 3.8.13-55.1.6.el7uek.x86_64 which is at line nu