why 3 boot up options

[wxw]

Hi guys I am new to centos, and after several days exploring, I got it installed with all the necessary components I need. However, I got 3 boot up options with exactly the same system. Attached is the picture of the screen. Anyone knows what are these three used for? And if it is useless, how can I eliminate them?

Thank you.

[TrevorH]

They are not the same but your screenshot has chopped off the right hand side where the differences are. They are 2 different kernel versions and also the bottom one is the rescue kernel if all else fails. Each time there is a kernel update there will be another option added until the maximum number of concurrent kernels is reached and then the oldest will automatically be removed.

[versluis]

Thank your for the question wxw, and thank you for the answer Trevor - I was wondering about this myself

Just to clarify: all packages that are loaded and the server configuration will be exactly the same in all (non-rescue) boot options, but we have a choice of kernel, is that right?