2.2. Deploy the ResourceManager HA Cluster

Copy the etc/hadoop/conf/yarn-site.xml file from the primary ResourceManager host to the standby ResourceManager host.
Make sure that the clientPort value set in etc/zookeeper/conf/zoo.cfg matches the port set in the following yarn-site.xml property:
```
<property>
 <name>yarn.resourcemanager.zk-state-store.address</name>
 <value>localhost:2181</value>
</property>
```

Start ZooKeeper. Execute this command on the ZooKeeper host machine(s):

su - zookeeper -c "export ZOOCFGDIR=/usr/hdp/current/zookeeper-server/conf ; export ZOOCFG=zoo.cfg; source /usr/hdp/current/zookeeper-server/conf/zookeeper-env.sh ; /usr/hdp/current/zookeeper-server/bin/zkServer.sh start"

Start HDFS using the instructions provided in "Controlling HDP Services Manually," in the HDP Reference Guide.
Start YARN using the instructions provided in "Controlling HDP Services Manually," in the HDP Reference Guide.
Set the active ResourceManager:
MANUAL FAILOVER ONLY: If you configured manual ResourceManager failover, you must transition one of the ResourceManagers to Active mode. Execute the following CLI command to transition ResourceManager "rm1" to Active:
```
yarn rmadmin -transitionToActive rm1
```
You can use the following CLI command to transition ResourceManager "rm1" to Standby mode:
```
yarn rmadmin -transitionToStandby rm1 
```
AUTOMATIC FAILOVER: If you configured automatic ResourceManager failover, no action is required -- the Active ResourceManager will be chosen automatically.
Start all remaining unstarted cluster services using the instructions provided in "Controlling HDP Services Manually," in the HDP Reference Guide.

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