I tried to make new cluster with ambari, but in the assign master node process the drop down is empty, there is no hostname option at all.
This indicates that your Host Registration details might not be persisted properly inside the Ambari Database.
As you are seems to be trying to create a new cluster, So in that case it will be best if you perform ambari-server database reset and then try creating the cluster again that will be quick:
# ambari-server stop # ambari-server reset # ambari-server start
Now try to create the cluster freshly from ambari UI. Also it will be best to use the browser in "Incognito Mode" (Private Mode) to make sure that the browser cache is not causing any issue.
If you still face the same issue then please share the ambari server log with us. Along with One of the Ambari-agent log (and out file).
# ls -l /var/log/amabri-server/ambari-server.log # ls -l /var/log/amabri-agent/ambari-agent.log (ambari-agent.out)
I have tried to reset ambari server but the problem still persist, before this i have problem with Confirming host Process that stuck in checking for potential problem.
Then i follow the instruction in this post to copy url on step3 and paste it in new tab with replacing step3 with step4.
From your ambari-server log it looks like you are hitting this issue: https://issues.apache.org/jira/browse/AMBARI-21706
Please let us know your ambari server version. It looks like Ambari 2.6 has the fix for the below error which seems to be causing the issue you are facing.
Your ambari-server.log error
09 Nov 2017 14:15:18,593 WARN [ambari-client-thread-22] AbstractResourceProvider:134 - Error occurred during preparation of stack advisor request java.lang.ClassCastException: java.util.LinkedHashSet cannot be cast to java.util.List at org.apache.ambari.server.controller.internal.StackAdvisorResourceProvider.prepareStackAdvisorRequest(StackAdvisorResourceProvider.java:110) at org.apache.ambari.server.controller.internal.ValidationResourceProvider.createResources(ValidationResourceProvider.java:81) at org.apache.ambari.server.controller.internal.ClusterControllerImpl.createResources(ClusterControllerImpl.java:298) at org.apache.ambari.server.api.services.persistence.PersistenceManagerImpl.create(PersistenceManagerImpl.java:97) at org.apache.ambari.server.api.handlers.CreateHandler.persist(CreateHandler.java:37) at org.apache.ambari.server.api.handlers.BaseManagementHandler.handleRequest(BaseManagementHandler.java:73)