The zenpack installation instructions on zenoss wiki are obsolete for Zenoss 5. Here is how you have to do it on Zenoss 5 mkdir /tmp/zenpack && cd /tmp/zenpack/
serviced service stop zenoss.core
serviced service start ZooKeeper serviced service start mariadb serviced service start RabbitMQ serviced service start redis serviced service start zeneventserver serviced service start Zope #If redis fails then use the serviceid shown by the serviced start command for redis service #Then download zenpack wget http://wiki.zenoss.org/download/zenpacks/ZenPacks.zenoss.PythonCollector/1.7.4/ZenPacks.zenoss.PythonCollector-1.7.4.egg #and install
serviced service run zope zenpack install ZenPacks.zenoss.PythonCollector-1.7.4.egg #Then start Zenoss
serviced service restart zenoss.core