How to add Zeppelin to CDH 'by the book'?
CDH supports Hue for the notebook environment.
Cloudera Manager has no Zeppelin Parcel support, as far as I know.
I'm not sure what you mean by "managed solution", but automating an install of Zeppelin (and Spark), configuring to point at an external YARN master for job submission isn't too complicated, and can be written in Puppet, Chef, or Ansible fairly easily if you know those tools.
There is https://github.com/ssheremeta/zeppelin-cloudera which allows you to package Zeppelin into the Cloudera Parcel (works well with 8), however I stumbled upon some issues, when trying to add Spark interpreter to the instance installed like that.
EDIT: Parcel format is described here: https://github.com/cloudera/cm_ext/wikiIt's fairly complicated, but it allows you to have fully cloudera-managed-parcel made from whatever you want. You will need to write few scripts and service definition file - but it allows you to automate some things that normally you need to do yourself.