Hi! Have problem in process NIFI Upgrade ,
[root@serv12 ~]# grep -i Ranger /var/lib/ambari-agent/data/output-869.txt 2018-10-03 17:49:28,216 - Ranger admin not installed
What documentation did you follow for the upgrade? Was it rolling or express upgrade did you encounter any issues?
Can you share the whole error stack?
Then install ranger manually or re-try through ambari
yum install ranger-admin yum install ranger-usersync