All, I have installed HDPv2.6.1 in single node server and adding new BigSQL service fails because of passwordless SSH failed. I configured passwordless ssh for userid: hdpadmin. Why bigsql using root id ? Here is the log:stderr: /var/lib/ambari-agent/data/errors-304.txt Permission denied, please try again. Permission denied, please try again. Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password). ERROR: Failed to deploy custom action script. RC = 65280 Verify the user running Ambari has passwordless SSH to the Ambari server host and retry. stdout: Running Ambari as: root Tokens in hdfs data path: [1] 2017-09-06 15:44:47,403 - Execute['sudo chown bigsql:hadoop /home/bigsql'] {} 2017-09-06 15:44:47,441 - Execute[' echo bigsql:[PROTECTED] | sudo /usr/sbin/chpasswd; exit 0'] {} Going to update bigsql-head-env with properties: ('bigsql_active_primary', ':', 'xx.xx.xx.one.com') Running Ambari as: root Tokens in hdfs data path: [1] 2017-09-06 15:44:51,064 - Execute['sudo chmod 755 /var/lib/ambari-agent/cache/extensions/IBM-Big_SQL/5.0.1.0/services/BIGSQL/package; exit 0'] {} 2017-09-06 15:44:51,081 - Execute['sudo chmod 755 /var/lib/ambari-agent/cache/extensions/IBM-Big_SQL/5.0.1.0/services/BIGSQL/package/scripts; exit 0'] {} 2017-09-06 15:44:51,097 - Execute['sudo chmod 755 /var/lib/ambari-agent/cache/extensions/IBM-Big_SQL/5.0.1.0/services/BIGSQL/package/scripts/*; exit 0'] {} Command failed after 1 tries ... View more