The Oozie Web UI requires ExtJS which is not provided by default as of HDP (Hortonworks Data Platform) 2.6.5.
## Enable HDP-UTILS-GPL
## Note: This will break with HDP upgrades!
cd /etc/yum.repos.d/
sudo wget https://public-repo-1.hortonworks.com/HDP-UTILS-GPL-1.1.0.22/repos/centos7/hdp-utils-gpl.repo
## Install ExtJS for Oozie
## Note: This must be updated manually and presents a security hole if not updated.
sudo yum install extjs --nogpgcheck
## Restart Oozie from Ambari
## This will trigger a rebuild of the WAR
## If Oozie UI should use SSL (HTTPS) then you may need to:
## 1. Stop Oozie from Ambari.
## 2. Rebuild Oozie WAR:
sudo su -l oozie -c "/usr/hdp/current/oozie-server/bin/oozie-setup.sh prepare-war -secure"
## 3. Start Oozie from Ambari