3. Add HBase RegionServer

Use the following instructions to manually add HBase RegionServer hosts:

On each of the new slave nodes, install HBase and ZooKeeper.
- For RHEL/CentOS/Oracle Linux:
```
yum install zookeeper hbase
```
- For SLES:
```
zypper install zookeeper hbase                 
```

On each of the new slave nodes, add the HDP repository to yum:

For RHEL/CentOS 5:

wget -nv http://public-repo-1.hortonworks.com/HDP/centos5/2.x/GA/2.1-latest/hdp.repo -O /etc/yum.repos.d/hdp.repo

For RHEL/CentOS 6:

wget -nv http://public-repo-1.hortonworks.com/HDP/centos6/2.x/GA/2.1-latest/hdp.repo -O /etc/yum.repos.d/hdp.repo

For SLES:

wget -nv http://public-repo-1.hortonworks.com/HDP/suse11/2.x/GA/2.1-latest/hdp.repo -O /etc/zypp.repos.d/hdp.repo

Copy the HBase configurations to the new slave nodes and set appropriate permissions.
- Option I: Copy HBase config files from an existing slave node.
  1. On any existing slave node, make a copy of the current configurations:
    tar zcvf hbase_conf.tgz /etc/hbase/conf tar zcvf zookeeper_conf.tgz /etc/zookeeper/conf
  2. Copy this file to each of the new nodes:
    rm -rf /etc/hbase/conf mkdir -p /etc/hbase/conf cd / tar zxvf $location_of_copied_conf_tar_file/hbase_conf.tgz chmod -R 755 /etc/hbase/conf
    rm -rf /etc/zookeeper/conf mkdir -p /etc/zookeeper/conf cd / tar zxvf $location_of_copied_conf_tar_file/zookeeper_conf.tgz chmod -R 755 /etc/zookeeper/conf
- Option II: Manually add Hadoop configuration files as described here.
On all of the new slave nodes, create the config directory, copy all the config files, and set the permissions:
```
rm -r $HBASE_CONF_DIR ;
mkdir -p $HBASE_CONF_DIR ;
```
```
copy all the config files to $HBASE_CONF_DIR
```
```
chmod a+x $HBASE_CONF_DIR/;
chown -R $HBASE_USER:$HADOOP_GROUP $HBASE_CONF_DIR/../  ;
chmod -R 755 $HBASE_CONF_DIR/../
```
```
rm -r $ZOOKEEPER_CONF_DIR ;
mkdir -p $ZOOKEEPER_CONF_DIR ;
```
```
copy all the config files to $ZOOKEEPER_CONF_DIR 
```
```
chmod a+x $ZOOKEEPER_CONF_DIR/;
chown -R $ZOOKEEPER_USER:$HADOOP_GROUP $ZOOKEEPER_CONF_DIR/../  ;
chmod -R 755 $ZOOKEEPER_CONF_DIR/../
                
```
where:
- $HBASE_CONF_DIR is the directory to store the HBase configuration files. For example, /etc/hbase/conf.
- $HBASE_USER is the user owning the HBase services. For example, hbase.
- $HADOOP_GROUP is a common group shared by services. For example, hadoop.
- $ZOOKEEPER_CONF_DIR is the directory to store the ZooKeeper configuration files. For example, /etc/zookeeper/conf
- $ZOOKEEPER_USER is the user owning the ZooKeeper services. For example, zookeeper.

Start HBase RegionServer node:

<login as $HBASE_USER>
/usr/lib/hbase/bin/hbase-daemon.sh --config $HBASE_CONF_DIR start regionserver

On the HBase Master host machine, edit the /usr/lib/hbase/conf file and add the list of slave nodes' hostnames. The hostnames must be separated by a newline character.

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