You may be hittung this bug https://issues.apache.org/jira/browse/AMBARI-22652   A workaround is to delete the line of code:   package_version = None  in all agents in file: /usr/lib/ambari-agent/lib/resource_management/libraries/script/script.py  at line 541 in ambari 2.6.2.2   then compile the script with: python -O -m compileall script.py ... View more