@snm1523As per the description I see that while you are creating the key getting following error.  "user not allowed to do create key".   Solution:  1. To see the cm_kms you need to login with keyadmin user in Ranger Admin. Did you tried logging in with "keyadmin" user? Or  2. Please login to the Ranger webUI as admin and under Settings --> Users/Groups/Roles and search 'User Name: rangerkms' Click on the rangekms user, then under roles add the keyadmin role. Save, then resume the upgrade in CM. If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. ... View more

Possible solution:  1. Recreate Keytabs 2. Start Yarn from CLI and fix Ambari issue https://docs.cloudera.com/HDPDocuments/HDP2/HDP-2.6.2/bk_command-line-upgrade/content/start-yarn-mr-25.html  Kindly provide the below output for further investigation. curl -sS -L -w '%{http_code}' -X GET -d '' -H 'Content-Length: 0' --negotiate -u : 'http://hostname:50070/webhdfs/v1/ats/done?op=GETFILESTATUS   ... View more

The following areas normally cause this problem: 1) the connection from Ambari agent host to Ambari Server got lost. 2) firewall issue blocked connections. 3) hostname and IP address are not being set correctly in /etc/hosts   You can compare the output using these APIs: > curl ­u user:paswd http://AmbariHost:8080/api/v1/hosts ... View more

@vinod_artga To resolve this issue, open /opt/cloudera/cm/bin/gen_credentials.sh for editing and add the following to the very end of the script: exit ${PIPESTATUS[0]} And then try generating Kerberos credentials once more. If it fails again, you should see much more detail assisting in troubleshooting. This will be addressed in a future release of Cloudera Manager. ... View more

Ambari is not tested yet with centos 8. You can try installing it on centos8, But there could chances you may face different type of issues. ... View more

I was facing the similar error and got it resolved by added Hadoop users to passwd file.    resource_management.core.exceptions.ExecutionFailed: Execution of 'usermod -G hadoop -g hadoop hive' returned 6. usermod: user 'hive' does not exist in /etc/passwd Error: Error: Unable to run the custom hook script ['/usr/bin/python', '/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-ANY/scripts/hook.py', 'ANY', '/var/lib/ambari-agent/data/command-59009.json', '/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-ANY', '/var/lib/ambari-agent/data/structured-out-59009.json', 'INFO', '/var/lib/ambari-agent/tmp', 'PROTOCOL_TLSv1_2', '']   >> File location /etc/passwd >> Adduser hadoop  ... View more