Support Questions
Find answers, ask questions, and share your expertise
Announcements
Alert: Welcome to the Unified Cloudera Community. Former HCC members be sure to read and learn how to activate your account here.

remove hosts and make new cluster after renaming

remove hosts and make new cluster after renaming

New Contributor

I found it necessary to troubleshoot a problem enabling kerberos to modify the ambari server and cluster boxes /etc/hostname from name.example.com to name.corp.example.com

I also edited the /etc/hosts on all to reflect accordingly.

I also ran ambari-server setup-security and option 1 to DISABLE the https.

How do I remove current host which are still named without *.corp.* and remake my cluster please? thanks!

6 REPLIES 6

Re: remove hosts and make new cluster after renaming

Super Mentor

Re: remove hosts and make new cluster after renaming

Super Mentor

@Tom Burke

Similarly in order to permantly delete OLD unwanted hosts from Ambari DB please check the following article:

https://community.hortonworks.com/content/supportkb/155423/how-to-remove-an-existing-host-in-ambari-...

.

But before manipulating the Ambari DB manually better to take a fresh Ambari DB dump so that you have back to revert back.

Highlighted

Re: remove hosts and make new cluster after renaming

New Contributor

ambari-db-admin.pngIs there a default passwd for ambari sql? we use backend postgre but I do nto know what the passwd is for the DB.

Re: remove hosts and make new cluster after renaming

New Contributor

referencing your first link....

seems outdated from UI ....there is no Ambari Web ...Background Services as far as I can tell it is done with Host menu Actionshost-rename-issue1.pdf.... I cannot stop components, see attached.

Re: remove hosts and make new cluster after renaming

New Contributor
# ambari-server update-host-names host_names_changes.json
Using python  /usr/bin/python
Updating host names
Please, confirm Ambari services are stopped [y/n] (n)? y
Please, confirm there are no pending commands on cluster [y/n] (n)? y
Please, confirm you have made backup of the Ambari db [y/n] (n)? y
ERROR: Error executing update host names, please check the server logs.
ERROR: Exiting with exit code 1.
REASON: Host names update failed.



Host name change failed using this method.

Re: remove hosts and make new cluster after renaming

Super Mentor

@Tom Burke

Please share the "host_names_changes.json" file and "ambari-server.log" so that we can check if the JSOn file is correct and to know what error exactly appeared inside the ambari logs.