some times if you run some curl calls expecting to fix some other issues - it may turn out to that Ambari UI does not even load the UI. Running the below call would fix the issue and load the UI. curl -u admin:admin -i -H 'X-Requested-By: ambari' -X POST -d '{"wizard-data":"{\"userName\":\"admin\",\"controllerName\":\"\"}"}'http://AMBARIHOST:8080/api/v1/persist Note: Please note that these call should run with caution. contact Hortonworks support team. This is tried and tested with Ambari-2.4.x ... View more

Steps to enable Trace logging in Ambari server for Oracle Database. Step1: 1. Download ojdbc6_g.jar from Oracle JDBC driver trace jar and copy to /usr/share/java and make sure to have correct permissions. Note: take out the actual ojdbc.jar from the location. 2.Create /etc/ambari-server/conf/oracle.properties .level=ALL oracle.jdbc.level=INFO oracle.jdbc.handlers=java.util.logging.ConsoleHandler java.util.logging.ConsoleHandler.level=INFO java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter 3. Add "-Doracle.jdbc.Trace=true -Djava.util.logging.config.file=/etc/ambari-server/conf/oracle.properties" property in /var/lib/ambari-server/ambari-env.sh export AMBARI_JVM_ARGS=$AMBARI_JVM_ARGS' -Xms512m -Xmx2048m -XX:MaxPermSize=128m -Djava.security.auth.login.config=$ROOT/etc/ambari-server/conf/krb5JAASLogin.conf -Djav to export AMBARI_JVM_ARGS=$AMBARI_JVM_ARGS' -Xms512m -Xmx2048m -XX:MaxPermSize=128m -Doracle.jdbc.Trace=true -Djava.util.logging.config.file=/etc/ambari-server/conf/oracle.properties -Djava.security.auth.login.config=$ROOT/etc/ambari-server/conf/krb5JAASLogin.conf -Djav After restart you will see logs being written to jdbc.log file ... View more

Ambari REST APIs to add a component in kerberized cluster. I tried and tested these in Ambari 2.4.1 version Here is an example to install SECONDARY_NAMENODE 1. API to Add a Component curl -s -H "X-Requested-By:ambari" --user admin:admin -i -X POST -d '{"host_components":[{"HostRoles":{"component_name":"SECONDARY_NAMENODE"}}]}' http://AMBARIHOST:8080/api/v1/clusters/CLUSTERNAME/hosts?Hosts/host_name=COMPONENTHOST 2. API to install the Above added component. curl -s -H "X-Requested-By:ambari" --user admin:admin -i -X PUT -d '{"RequestInfo":{"context":"Install SECONDARY_NAMENODE","operation_level":{"level":"HOST_COMPONENT","cluster_name":"test","host_name":"COMPONENTHOST","service_name":"HDFS"}},"Body":{"HostRoles":{"state":"INSTALLED"}}}' http://AMBARIHOST:8080/api/v1/clusters/CLUSTERNAME/hosts/COMPONENTHOST/host_components/SECONDARY_NAMENODE 3. API to provide kerberos credentials. curl -s -H "X-Requested-By:ambari" --user admin:admin -i -X POST -d '{ "Credential" : { "principal" : "admin/admin", "key" : "admin", "type" : "temporary" } }' http://AMBARIHOST:8080/api/v1/clusters/CLUSTERNAME/credentials/kdc.admin.credential Note: Replace CLUSTERNAME, AMBARIHOST, COMPONENTHOST with appropriate values ... View more