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Verified against releases 1.4.1/1.2.5

Starting 1.4.2/1.4.3 you will have to add -H option to the curl calls. E.g. -H "X-Requested-By: ambari"

1. Ensure the host is registered properly.

Code Block

curl -u admin:admin http://AMBARI_SERVER_HOST:8080/api/v1/hosts

Sample OUTPUT
{
  "href" : "http://AMBARI_SERVER_HOST:8080/api/v1/hosts",
  "items" : [
    {
      "href" : "http://AMBARI_SERVER_HOST:8080/api/v1/hosts/NEW_HOST_ADDED",
      "Hosts" : {
        "host_name" : "NEW_HOST_ADDED"
      }
    }
  ...]
}

If you do not see the host resource then verify that ambari-agent registered successfully with the ambari-server. See through the logs to check what host-name was used for registration.
2. Add the host to the cluster.

Code Block

curl --user admin:admin -i -X POST http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/hosts/NEW_HOST_ADDED

3. Ensure the host is added to the cluster.

Code Block

curl --user admin:admin -i -X GET http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/hosts/NEW_HOST_ADDED

...

Ensure that ganglia monitor is also installed on the new hosts.

Code Block

curl --user admin:admin -i -X POST http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/hosts/NEW_HOST_ADDED/host_components/DATANODE
curl --user admin:admin -i -X POST http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/hosts/NEW_HOST_ADDED/host_components/GANGLIA_MONITOR

5. Install the components.
This step will create requests that you can monitor for progress and result.

Code Block

curl --user admin:admin -i -X PUT -d '{"HostRoles": {"state": "INSTALLED"}}' http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/hosts/NEW_HOST_ADDED/host_components/GANGLIA_MONITOR
curl --user admin:admin -i -X PUT -d '{"HostRoles": {"state": "INSTALLED"}}' http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/hosts/NEW_HOST_ADDED/host_components/DATANODE

Each install request will return a request id that can be used to monitor progress.

Code Block

Sample OUTPUT
{
  "href" : "http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/requests/9",
  "Requests" : {
    "id" : 9,
    "status" : "InProgress"
  }
}

Monitor the request and tasks within the request for progress

Code Block

curl --user admin:admin -i -X GET http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/requests/9
curl --user admin:admin -i -X GET http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/requests/9/tasks/101

{
  "href" : "http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/requests/9/tasks/101",
  "Tasks" : {
    ...
    "status" : "COMPLETED",
    ...
  }
}

Use the following to access all tasks for a given request

Code Block

curl -u admin:admin http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/requests/9?fields=tasks/Tasks/*

6. Start the components.
This step will create requests that you can monitor for progress and result. Start the components after install has been successful.

Code Block

curl --user admin:admin -i -X PUT -d '{"HostRoles": {"state": "STARTED"}}' http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/hosts/NEW_HOST_ADDED/host_components/GANGLIA_MONITOR
curl --user admin:admin -i -X PUT -d '{"HostRoles": {"state": "STARTED"}}' http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/hosts/NEW_HOST_ADDED/host_components/DATANODE

Each install request will return a request id that can be used to monitor progress.
Client components, such as HDFS_CLIENT, need not be started. Nagios server may need to be restarted to ensure it picks up the new host and reports its status.
7. Restart Nagios.

Code Block

curl --user admin:admin -i -X PUT -d '{"RequestInfo": {"context": "Stop Nagios"}, "ServiceInfo": {"state": "INSTALLED"}}' http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/services/NAGIOS
curl --user admin:admin -i -X PUT -d '{"RequestInfo": {"context": "Start Nagios"}, "ServiceInfo": {"state": "STARTED"}}' http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/services/NAGIOS