This happens when using auto-deploy installation ( hint ). # ./core-autodeploy.sh The error happens in https://gist.github.com/fortran01/e6eb87c87fa8bb7aa3eb/ebdcce749b366c6cf97346f0411e91dd114a61d4#file-zenoss-core-autodeploy-ec817e6_core-autodeploy-sh-L261-L265 when the zenoss service is started. Zenoss not initialized. Performing first-boot initialization... Fresh install pre steps Checking RRDtool version >= 1.4.7: [FAIL] Missing. Error: rrdtool is not in the search path. Please confirm that RRDtool (version >= 1.4.7) is installed. It can be verified that rrdtool is already installed. # rrdtool --version RRDtool 1.4.7 Copyright 1997-2012 by Tobias Oetiker Compiled Apr 5 2012 17:36:08 The routine that checks for rrdtool is in /opt/zenoss/bin/install-functions.sh. Look for confirm_rrd(). It uses the command `which` that is not installed by default in the Centos 6 docker image. # yum install which -y Loaded plugins: fastestmirror Sett...