Updating Ambari Stack Repos via REST API

If you use Ambari to deploy Hadoop you may have had occasion to need to change your the repo used after you installed. At the time of this article version 1.5.1 of Ambari requires you do this via API as it is not exposed in Ambari web. The HDP repo file placed in /etc/yum.repos.d is generated by Ambari under certain conditions. In any case this is a good review of how to use the REST interface to manipulate Ambari. The basic call includes the use of the curl command to GET and PUT items to the Ambari API layer. Want some basic information about your cluster try this:

curl -H “X-Requested-By: ambari” -X GET -u admin:XXXXX http://AMBARIHOSTNAME:8080/api/v1/clusters

Screen Shot 2014-05-20 at 1.41.59 PM

You can check your existing reponame via this command:

curl -H “X-Requested-By: ambari” -X GET -u admin:XXXXX http://AMBARIHOSTNAME:8080/api/v1/stacks2/HDP/versions/2.0.6/ operatingSystems/centos6/repositories/HDP-2.0.6 

Screen Shot 2014-05-20 at 1.42.28 PM

Then you can set this repo name to whatever name you need via this PUT command. This again is help in situations where perhaps the internal repo name has changed post install. After this call you can double check your work by rerunning the above command OR via Ambari web interface under Admin>Clusters>Repositories.

curl -H “X-Requested-By: ambari” -X PUT -u admin:XXXXX http://AMBARIHOSTNAME:8080/api/v1/stacks2/HDP/versions/2.0.6
/operatingSystems/centos6/repositories/HDP-2.0.6 -d ‘{“Repositories”: {“base_url”: “http://REPOHOSTNAMEHERE/HDP/centos6/2.x/updates/”, “verify_base_url”: false}}’

This works for all the different repos for each stack. You can play with the GET command above to explore the different options available for each installed stack.