According to Plesk Automation Deployment Guide Linux-based service nodes should run CentOS/RHEL 5.9, 6.4 or CloudLinux 6. Is it possible to run other CentOS versions like 6.6 ?
What CentOS versions is possible to run on service nodes?
The version specified in the product documentation is a minimal minor version which is required by Plesk Automation. This means that all CentOS 6.x versions above CentOS 6.4 are supported, to CentOS 6.7 inclusively.
Note: CentOS/RHEL 7 are not officially supported by Plesk Automation. Please vote for this feature on Plesk Automation Uservoice portal.