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 
```
- For Ubuntu:
```
apt-get 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

For Ubuntu:

wget http://public-repo-1.hortonworks.com/HDP/ubuntu12/2.x/hdp.list -O /etc/apt/sources.list.d/hdp.list

Copy the HBase configurations to the new slave nodes and set appropriate permissions.
- Option I: Copy HBase config files from an existing slave node.
  - 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
  - Copy these files 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 in "Set Up the Configuration Files", in Installing HDP Manually.
On all of the new slave nodes, create the configuration directory, copy all of the configuration files, and set the permissions:
```
rm -r $HBASE_CONF_DIR ;
mkdir -p $HBASE_CONF_DIR ;
```
Copy all of the configuration 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 of the configuration 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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