I'm new using CentOS. In my new job, my boss asked me to upgrade CentOS from 6 to 7. I've read a lot of forums here and outside and there is different information related with this upgrade. Some people say that there is tool to make this upgrade but looks like is old and not working with latest versions. I've searched in several topics here, but I cannot found a clear answer or answer are too old.
Please, can you assist me with my question?
It is possible to upgrade CentOS from 6 to 7 without a fresh installation?
If yes, do you have a step by step site or any how to?
This is a critical server for my Company, so I don't want to brake it.
Thank you for your support an assistance.