If you are a Linux sysadmin, you might not want others in your IT department, who has physical access to the server, change anything from the GRUB bootloader menu that is displayed during system startup.
GRUB is the 3rd stage in the Linux boot process that we discussed earlier.
GRUB security features allows you to set a password to the grub entries. Once you set a password, you cannot edit any grub entries, or pass arguments to the kernel from the grub command line without entering the password.
It is highly recommended to set GRUB password on any critical production systems as explained in this article.
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On some of the Linux distribution SELinux is enabled by default, which may cause some unwanted issues, if you don’t understand how SELinux works and the fundamental details on how to configure it. I strongly recommend that you understand SELinux and implement it on your environment. But, until you understand the implementation details of SELinux you may want to disable it to avoid some unnecessary issues.
My name is Ramesh Natarajan. I will be posting instruction guides, how-to, troubleshooting tips and tricks on Linux, database, hardware, security and web. My focus is to write articles that will either teach you or help you resolve a problem. Read more about