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<head>
  <title>Tutorial - Admin Operations</title>
</head>

## [Helix Tutorial](./Tutorial.html): Admin Operations

Helix provides a set of admin APIs for cluster management operations. They are supported via:

* Java API
* Command Line Interface
* REST Interface via helix-admin-webapp

### Java API
See interface [_org.apache.helix.HelixAdmin_](http://helix.apache.org/javadocs/0.8.2/reference/org/apache/helix/HelixAdmin.html)

### Command Line Interface
The command line tool comes with helix-core package:

Get the command line tool:

```
git clone https://git-wip-us.apache.org/repos/asf/helix.git
cd helix
git checkout tags/helix-0.8.2
./build
cd helix-core/target/helix-core-pkg/bin
chmod +x *.sh
```

Get help:

```
./helix-admin.sh --help
```

All other commands have this form:

```
./helix-admin.sh --zkSvr <ZookeeperServerAddress> <command> <parameters>
```

#### Supported Commands

| Command Syntax | Description |
| -------------- | ----------- |
| _\-\-activateCluster \<clusterName controllerCluster true/false\>_ | Enable/disable a cluster in distributed controller mode |
| _\-\-addCluster \<clusterName\>_ | Add a new cluster |
| _\-\-addIdealState \<clusterName resourceName fileName.json\>_ | Add an ideal state to a cluster |
| _\-\-addInstanceTag \<clusterName instanceName tag\>_ | Add a tag to an instance |
| _\-\-addNode \<clusterName instanceId\>_ | Add an instance to a cluster |
| _\-\-addResource \<clusterName resourceName partitionNumber stateModelName\>_ | Add a new resource to a cluster |
| _\-\-addResourceProperty \<clusterName resourceName propertyName propertyValue\>_ | Add a resource property |
| _\-\-addStateModelDef \<clusterName fileName.json\>_ | Add a State model definition to a cluster |
| _\-\-dropCluster \<clusterName\>_ | Delete a cluster |
| _\-\-dropNode \<clusterName instanceId\>_ | Remove a node from a cluster |
| _\-\-dropResource \<clusterName resourceName\>_ | Remove an existing resource from a cluster |
| _\-\-enableCluster \<clusterName true/false\>_ | Enable/disable a cluster |
| _\-\-enableInstance \<clusterName instanceId true/false\>_ | Enable/disable an instance |
| _\-\-enablePartition \<true/false clusterName nodeId resourceName partitionName\>_ | Enable/disable a partition |
| _\-\-getConfig \<configScope configScopeArgs configKeys\>_ | Get user configs |
| _\-\-getConstraints \<clusterName constraintType\>_ | Get constraints |
| _\-\-help_ | print help information |
| _\-\-instanceGroupTag \<instanceTag\>_ | Specify instance group tag, used with rebalance command |
| _\-\-listClusterInfo \<clusterName\>_ | Show information of a cluster |
| _\-\-listClusters_ | List all clusters |
| _\-\-listInstanceInfo \<clusterName instanceId\>_ | Show information of an instance |
| _\-\-listInstances \<clusterName\>_ | List all instances in a cluster |
| _\-\-listPartitionInfo \<clusterName resourceName partitionName\>_ | Show information of a partition |
| _\-\-listResourceInfo \<clusterName resourceName\>_ | Show information of a resource |
| _\-\-listResources \<clusterName\>_ | List all resources in a cluster |
| _\-\-listStateModel \<clusterName stateModelName\>_ | Show information of a state model |
| _\-\-listStateModels \<clusterName\>_ | List all state models in a cluster |
| _\-\-maxPartitionsPerNode \<maxPartitionsPerNode\>_ | Specify the max partitions per instance, used with addResourceGroup command |
| _\-\-rebalance \<clusterName resourceName replicas\>_ | Rebalance a resource |
| _\-\-removeConfig \<configScope configScopeArgs configKeys\>_ | Remove user configs |
| _\-\-removeConstraint \<clusterName constraintType constraintId\>_ | Remove a constraint |
| _\-\-removeInstanceTag \<clusterName instanceId tag\>_ | Remove a tag from an instance |
| _\-\-removeResourceProperty \<clusterName resourceName propertyName\>_ | Remove a resource property |
| _\-\-resetInstance \<clusterName instanceId\>_ | Reset all erroneous partitions on an instance |
| _\-\-resetPartition \<clusterName instanceId resourceName partitionName\>_ | Reset an erroneous partition |
| _\-\-resetResource \<clusterName resourceName\>_ | Reset all erroneous partitions of a resource |
| _\-\-setConfig \<configScope configScopeArgs configKeyValueMap\>_ | Set user configs |
| _\-\-setConstraint \<clusterName constraintType constraintId constraintKeyValueMap\>_ | Set a constraint |
| _\-\-swapInstance \<clusterName oldInstance newInstance\>_ | Swap an old instance with a new instance |
| _\-\-zkSvr \<ZookeeperServerAddress\>_ | Provide zookeeper address |

### REST Interface

The REST interface comes wit helix-admin-webapp package:

```
git clone https://git-wip-us.apache.org/repos/asf/helix.git
cd helix
git checkout tags/helix-0.8.2
./build
cd helix-admin-webapp/target/helix-admin-webapp-pkg/bin
chmod +x *.sh
./run-rest-admin.sh --zkSvr <zookeeperAddress> --port <port> // make sure ZooKeeper is running
```

#### URL and support methods

* _/clusters_
    * List all clusters

    ```
    curl http://localhost:8100/clusters
    ```

    * Add a cluster

    ```
    curl -d 'jsonParameters={"command":"addCluster","clusterName":"MyCluster"}' -H "Content-Type: application/json" http://localhost:8100/clusters
    ```

* _/clusters/{clusterName}_
    * List cluster information

    ```
    curl http://localhost:8100/clusters/MyCluster
    ```

    * Enable/disable a cluster in distributed controller mode

    ```
    curl -d 'jsonParameters={"command":"activateCluster","grandCluster":"MyControllerCluster","enabled":"true"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster
    ```

    * Remove a cluster

    ```
    curl -X DELETE http://localhost:8100/clusters/MyCluster
    ```

* _/clusters/{clusterName}/resourceGroups_
    * List all resources in a cluster

    ```
    curl http://localhost:8100/clusters/MyCluster/resourceGroups
    ```

    * Add a resource to cluster

    ```
    curl -d 'jsonParameters={"command":"addResource","resourceGroupName":"MyDB","partitions":"8","stateModelDefRef":"MasterSlave" }' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups
    ```

* _/clusters/{clusterName}/resourceGroups/{resourceName}_
    * List resource information

    ```
    curl http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB
    ```

    * Drop a resource

    ```
    curl -X DELETE http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB
    ```

    * Reset all erroneous partitions of a resource

    ```
    curl -d 'jsonParameters={"command":"resetResource"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB
    ```

* _/clusters/{clusterName}/resourceGroups/{resourceName}/idealState_
    * Rebalance a resource

    ```
    curl -d 'jsonParameters={"command":"rebalance","replicas":"3"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/idealState
    ```

    * Add an ideal state

    ```
    echo jsonParameters={
    "command":"addIdealState"
       }&newIdealState={
      "id" : "MyDB",
      "simpleFields" : {
        "IDEAL_STATE_MODE" : "AUTO",
        "NUM_PARTITIONS" : "8",
        "REBALANCE_MODE" : "SEMI_AUTO",
        "REPLICAS" : "0",
        "STATE_MODEL_DEF_REF" : "MasterSlave",
        "STATE_MODEL_FACTORY_NAME" : "DEFAULT"
      },
      "listFields" : {
      },
      "mapFields" : {
        "MyDB_0" : {
          "localhost_1001" : "MASTER",
          "localhost_1002" : "SLAVE"
        }
      }
    }
    > newIdealState.json
    curl -d @'./newIdealState.json' -H 'Content-Type: application/json' http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/idealState
    ```

    * Add resource property

    ```
    curl -d 'jsonParameters={"command":"addResourceProperty","REBALANCE_TIMER_PERIOD":"500"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/idealState
    ```

* _/clusters/{clusterName}/resourceGroups/{resourceName}/externalView_
    * Show resource external view

    ```
    curl http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/externalView
    ```
* _/clusters/{clusterName}/instances_
    * List all instances

    ```
    curl http://localhost:8100/clusters/MyCluster/instances
    ```

    * Add an instance

    ```
    curl -d 'jsonParameters={"command":"addInstance","instanceNames":"localhost_1001"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances
    ```

    * Swap an instance

    ```
    curl -d 'jsonParameters={"command":"swapInstance","oldInstance":"localhost_1001", "newInstance":"localhost_1002"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances
    ```
* _/clusters/{clusterName}/instances/{instanceName}_
    * Show instance information

    ```
    curl http://localhost:8100/clusters/MyCluster/instances/localhost_1001
    ```

    * Enable/disable an instance

    ```
    curl -d 'jsonParameters={"command":"enableInstance","enabled":"false"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
    ```

    * Drop an instance

    ```
    curl -X DELETE http://localhost:8100/clusters/MyCluster/instances/localhost_1001
    ```

    * Disable/enable partitions on an instance

    ```
    curl -d 'jsonParameters={"command":"enablePartition","resource": "MyDB","partition":"MyDB_0",  "enabled" : "false"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
    ```

    * Reset an erroneous partition on an instance

    ```
    curl -d 'jsonParameters={"command":"resetPartition","resource": "MyDB","partition":"MyDB_0"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
    ```

    * Reset all erroneous partitions on an instance

    ```
    curl -d 'jsonParameters={"command":"resetInstance"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
    ```

* _/clusters/{clusterName}/configs_
    * Get user cluster level config

    ```
    curl http://localhost:8100/clusters/MyCluster/configs/cluster
    ```

    * Set user cluster level config

    ```
    curl -d 'jsonParameters={"command":"setConfig","configs":"key1=value1,key2=value2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/cluster
    ```

    * Remove user cluster level config

    ```
    curl -d 'jsonParameters={"command":"removeConfig","configs":"key1,key2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/cluster
    ```

    * Get/set/remove user participant level config

    ```
    curl -d 'jsonParameters={"command":"setConfig","configs":"key1=value1,key2=value2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/participant/localhost_1001
    ```

    * Get/set/remove resource level config

    ```
    curl -d 'jsonParameters={"command":"setConfig","configs":"key1=value1,key2=value2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/resource/MyDB
    ```

* _/clusters/{clusterName}/controller_
    * Show controller information

    ```
    curl http://localhost:8100/clusters/MyCluster/Controller
    ```

    * Enable/disable cluster

    ```
    curl -d 'jsonParameters={"command":"enableCluster","enabled":"false"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/Controller
    ```

* _/zkPath/{path}_
    * Get information for zookeeper path

    ```
    curl http://localhost:8100/zkPath/MyCluster
    ```

* _/clusters/{clusterName}/StateModelDefs_
    * Show all state model definitions

    ```
    curl http://localhost:8100/clusters/MyCluster/StateModelDefs
    ```

    * Add a state mdoel definition

    ```
    echo jsonParameters={
      "command":"addStateModelDef"
    }&newStateModelDef={
      "id" : "OnlineOffline",
      "simpleFields" : {
        "INITIAL_STATE" : "OFFLINE"
      },
      "listFields" : {
        "STATE_PRIORITY_LIST" : [ "ONLINE", "OFFLINE", "DROPPED" ],
        "STATE_TRANSITION_PRIORITYLIST" : [ "OFFLINE-ONLINE", "ONLINE-OFFLINE", "OFFLINE-DROPPED" ]
      },
      "mapFields" : {
        "DROPPED.meta" : {
          "count" : "-1"
        },
        "OFFLINE.meta" : {
          "count" : "-1"
        },
        "OFFLINE.next" : {
          "DROPPED" : "DROPPED",
          "ONLINE" : "ONLINE"
        },
        "ONLINE.meta" : {
          "count" : "R"
        },
        "ONLINE.next" : {
          "DROPPED" : "OFFLINE",
          "OFFLINE" : "OFFLINE"
        }
      }
    }
    > newStateModelDef.json
    curl -d @'./untitled.txt' -H 'Content-Type: application/json' http://localhost:8100/clusters/MyCluster/StateModelDefs
    ```

* _/clusters/{clusterName}/StateModelDefs/{stateModelDefName}_
    * Show a state model definition

    ```
    curl http://localhost:8100/clusters/MyCluster/StateModelDefs/OnlineOffline
    ```

* _/clusters/{clusterName}/constraints/{constraintType}_
    * Show all contraints

    ```
    curl http://localhost:8100/clusters/MyCluster/constraints/MESSAGE_CONSTRAINT
    ```

    * Set a contraint

    ```
    curl -d 'jsonParameters={"constraintAttributes":"RESOURCE=MyDB,CONSTRAINT_VALUE=1"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/constraints/MESSAGE_CONSTRAINT/MyConstraint
    ```

    * Remove a constraint

    ```
    curl -X DELETE http://localhost:8100/clusters/MyCluster/constraints/MESSAGE_CONSTRAINT/MyConstraint
    ```
