Update Host Component ===== [Back to Resources](index.md#resources) **Summary** Update a host component for a given host and component. PUT api/v1/clusters/:name/hosts/:hostName/host_components/:hostComponentName **Response**

HTTP CODE	Description
200	OK
202	Accepted
400	Bad Request
401	Unauthorized
403	Forbidden
500	Internal Server Error

**Example 1** Start the NAMENODE component by updating its state to 'STARTED'. PUT api/v1/clusters/c1/hosts/hostname/host_components/NAMENODE { "HostRoles":{ "state":"STARTED" } } 202 Accepted { "href" : "http://your.ambari.server:8080/api/v1/clusters/c1/requests/12", "Requests" : { "id" : 12, "status" : "InProgress" } } **Example 2 ** Stop the NAMENODE component by updating its state to 'INSTALLED'. PUT api/v1/clusters/c1/hosts/hostname/host_components/NAMENODE { "HostRoles":{ "state":"INSTALLED" } } 202 Accepted { "href" : "http://your.ambari.server:8080/api/v1/clusters/c1/requests/13", "Requests" : { "id" : 13, "status" : "InProgress" } } **Example 3 ** Put the NAMENODE component into 'MAINTENANCE' mode. PUT api/v1/clusters/c1/hosts/hostname/host_components/NAMENODE { "HostRoles":{ "state":"MAINTENANCE" } } 202 Accepted { "href" : "http://your.ambari.server:8080/api/v1/clusters/c1/requests/14", "Requests" : { "id" : 14, "status" : "InProgress" } }