CentOS 6 to CentOS 7 Upgrades

[#1]

We're looking to upgrade our production nodes from CentOS 6.5 to CentOS 7.5. I don't think there is any way to "upgrade" to 7.x from 6.x and this would most likely require a fresh OS install for each node. Are there any best practices/warnings/advice for going about this, and is there any way to do this without having services go down? 

Thanks in advance. 

[#2]

Hi @willschlemmel,

Save a snapshot for all of your cluster configurations.

Regards, 

Manu.

[#3]

@willschlemmel,

Our documentation provides an overview that may help:

https://www.cloudera.com/documentation/enterprise/upgrade/topics/ug_os_upgrade.html