THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
Steps to add a new service to an existing cluster (the service is already part of the stack)
The stack definition can be found under server resources. On an installed and running Ambari server the location would be /var/lib/ambari-server/resources/stacks.
Step 1 - Add a Service to the cluster
API Call
curl -u <username>:<password> -i -X POST -d '{"ServiceInfo":{"service_name":"<service-name>"}}' http://<ambari-server-host>:8080/api/v1/clusters/<cluster-name>/services |
Step 2 - Add Components to the service
Service components are defined in the metainfo.xml file found in the service definition under HDP stack. E.g.: ambari-server/resources/stacks/HDP/0.1/services/HBASE/metainfo.xml
Service Component types:
Type |
Number of Instances |
Example |
|---|---|---|
MASTER |
1 or many |
HBASE (multi-master) |
SLAVE |
many |
TASKTRACKER |
CLIENT |
many |
HDFS CLIENT |
API Call
curl -u <username>:<password> -i -X POST http://<ambari-server-host>:8080/api/v1/clusters/<cluster-name>/services/<service-name>/components/<component-name> |
Example:
curl -u <username>:<password> -i -X POST http://<ambari-server-host>:8080/api/v1/clusters/c1/services/MAPREDUCE/components/JOBTRACKER |
Step 3 - Create configuration
Configurations in Ambari are distinguished using type and tag properties. Once a configuration is created it can be applied to a service, specifying the type and tag for the configuration.
The tag can be treated as a version number with a versioning scheme like, "version" + unix timestamp, indicating that the latest tag is also the latest configuration.
API Call
curl -u <username>:<password> -i -X POST -d '{"type": "<config-type>", "tag": "<config-tag>", "properties" : { "key1" : "value1", "key2" : "value2", "key3" : "value3" }}' http://<ambari-server-host>:8080/api/v1/clusters/<cluster-name>/configurations |
Example:
curl -i -X POST -d '{"type": "core-site", "tag": "version1363902625", "properties" : { "fs.default.name" : "localhost:8020"}}' http://<cluster-name>:8080/api/v1/clusters/c1/configurations |
Note:
This is not an incremental add to properties and every configuration once created is immutable.
New lines and spaces are tolerated. This is specially important when copying existing configuration that is pretty printed JSON string.
Step 4 - Apply configuration to service
API call
curl -u <username>:<password> -i -X PUT -d '{"config": {"<config-type>": "<config-tag>" }}' http://<ambari-server-host>:8080/api/v1/clusters/<cluster-name>/services/<service-name> |
Example:
curl -u admin:admin -i -X PUT -d '{"config": {"core-site": "version1363902625" }}' http://<cluster-name>:8080/api/v1/clusters/c1/services/MAPREDUCE |
Step 5 - Create host components
This essentially means creating the host to service component mapping or assigning Roles to hosts in your cluster.
API Call
curl -u <username>:<password> -i -X POST -d '{"host_components" : <ac:link><ri:page ri:space-key="{"HostRoles"" ri:content-title="{"component_name":"<component-name>"}}" /></ac:link> }' http://<ambari-server-host>:8080/api/v1/clusters/<cluster-name>/hosts?Hosts/host_name=<host-names> |
Note: This is the same hostname used during registration of the host. Multiple hosts can be assigned the same Role using this API
Step 6 - Install & Start the service
Make sure the service components are created and the configurations attached by making a GET call.
http://<ambari-server-host>:8080/api/v1/clusters/<cluster-name>/services/<service-name> |
Install the service.
API Call
curl -u <username>:<password> -i -X PUT -d '{"ServiceInfo": {"state" : "INSTALLED"}}' http://<ambari-server-host>:8080/api/v1/clusters/<cluster-name>/services/<service-name> |
Start the service.
API Call
curl -u <username>:<password> -i -X PUT -d '{"ServiceInfo": {"state" : "STARTED"}}' http://<ambari-server-host>:8080/api/v1/clusters/<cluster-name>/services/<service-name> |