@Michael Klaene In a kerberized cluster you will need to first post your "kdc.admin.credential" to Ambari and then try your other API calls like Example: (Please provide your KDC principal and credentials there. # curl -s -H "X-Requested-By:ambari" --user admin:admin -i -X POST -d '{ "Credential" : { "principal" : "admin/admin", "key" : "admin", "type" : "temporary" } }' http://my-ambari-host:8080/api/v1/clusters/my-cluster/credentials/kdc.admin.credential Then try your API calls: # curl --user admin:admin -i -H "X-Requested-By:ambari" -X PUT -d '{"HostRoles": {"state":"INSTALLED"}}' http://my-ambari-host:8080/api/v1/clusters/my-cluster/hosts/my-host/host_components/ATLAS_CLIENT . The temporary credential store is a keystore in memory where each entry is removed after 90 minutes (from initial creation), when Ambari is restarted, or by user request. The persisted credential store is a keystore stored on disk where each entry is removed only by user request. The option to store a credential in the persisted store is only available if Ambari's credential store has been setup. Please refer to the following HCC Article as well: https://community.hortonworks.com/articles/42927/adding-kdc-administrator-credentials-to-the-ambari.html
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