2. Meet Minimum System Requirements - Hortonworks Data Platform

2.1. Hardware Recommendations

Although there is no single hardware requirement for installing HDP, there are some basic guidelines. You can see sample setups here: Hardware Recommendations for Apache Hadoop.

2.2. Operating Systems Requirements

The following operating systems are supported:

64-bit Red Hat Enterprise Linux (RHEL) 5 or 6
64-bit CentOS 5 or 6
64-bit SUSE Linux Enterprise Server (SLES) 11, SP1

2.3. Software Requirements

On each of your hosts:

yum [for RHEL or CentOS]
zypper [for SLES]
rpm
scp [for multiple node installs]
curl
wget
unzip
tar
pdsh [for multiple node installs over many hosts]

2.4. Database Requirements

To use external database for Hive or Oozie metastore, ensure that a MySQL or Oracle database is deployed and available.
(By default, Hive and Oozie use Derby database for the metastore.)
- For instructions on deploying and/or configuring MySQL database instance, see here.
- For instructions on configuring an existing Oracle database instance, see here.
  Note
  To deploy a new Oracle instance, consult your database administrator.
Ensure that your database administrator creates the following databases and users. (For instructions on creating users for MySQL, see here.):
- If deploying Hive:
  1. hive_dbname: Required if using MySQL database for Hive Metastore.
  2. hive_dbuser
  3. hive_dbpasswd
- If deploying Oozie:
  1. oozie_dbname: Required if using MySQL database for Oozie Metastore.
  2. oozie_dbuser
  3. oozie_dbpasswd

	Note
To deploy a new Oracle instance, consult your database administrator.

Instructions to setup MySQL database

Connect to the host machine where you plan to deploy MySQL instance and from a terminal window, type:
- For RHEL and CentOS:
```
yum install mysql-server
```
- For SLES:
```
zypper install mysql
```
Start the instance.
- For RHEL and CentOS:
```
/etc/init.d/mysqld start
```
- For SLES:
```
/etc/init.d/mysql start
```
Set the root user password and remove unnecessary information from log and STDOUT.
```
mysqladmin -u root password ‘$password’
```
```
mysqladmin -u root 2>&1 >/dev/null
```

Install the MySQL connector jar

yum install mysql-connector-java-5.0.8-1

Instructions to configure Oracle database

Download the Oracle JDBC (OJDBC) driver from here and copy the downloaded JAR file to the following locations:
Note
The following instructions are for OJDBC driver for Oracle 11g.
- If installing Hive: Copy the JAR file to /usr/lib/hive/lib/.
- If using external Oracle database for Oozie metastore: Copy the JAR file to /usr/lib/oozie/libtools/.
- If installing Sqoop: Copy the JAR file to /usr/lib/sqoop/lib.
Ensure that the following SQL script is run against your Hive schema:
```
$master-install-location/gsInstaller/confSupport/sql/oracle/hive-schema-0.10.0.oracle.sql
```

	Note
The following instructions are for OJDBC driver for Oracle 11g.

Instructions on manually creating users for MySQL:

As root, use mysql (or other client tool) to create the “dbuser” and grant it adequate privileges.
(For access to Hive metastore, create hive_dbuser and for access to Oozie metastore, create oozie_dbuser.
```
CREATE USER 'dbusername'@'%' IDENTIFIED BY 'dbuserpassword';
GRANT ALL PRIVILEGES ON *.* TO 'dbusername'@'%';
flush privileges;
```
See if you can connect to the database as that user. You are prompted to enter the dbuserpassword password above.
```
mysql -u $dbusername -p
```

2.5. JDK Requirements

Your system must have the correct JDK installed on all the nodes of the cluster. HDP requires Oracle JDK 1.6 update 31.

Use the following instructions to manually install JDK 1.6 update 31:

Check the version. From a terminal window, type:
```
java -version
```
(Optional) Uninstall the Java package if the JDK version is less than v1.6 update 31.
```
rpm -qa | grep java
yum remove {java-1.*}
```
(Optional) Verify that the default Java package is uninstalled.
```
which java
```

Download the Oracle 64-bit JDK (jdk-6u31-linux-x64.bin) from the Oracle download site:

wget http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase6-419409.html#jdk-6u31-oth-JPR

Change directory to the location where you downloaded the JDK and run the install.

mkdir /usr/jdk1.6.0_31
cd /usr/jdk1.6.0_31
chmod u+x $JDK_download_directory/jdk-6u31-linux-x64.bin
./$JDK_download_directory/jdk-6u31-linux-x64.bin

Create symbolic links (symlinks) to the JDK.

mkdir /usr/java
ln -s /usr/jdk1.6.0_31/jdk1.6.0_31 /usr/java/default
ln -s /usr/java/default/bin/java /usr/bin/java

Set up your environment to define JAVA_HOME to put the Java Virtual Machine and the Java compiler on your path.
```
export JAVA_HOME=/usr/java/default
export PATH=$JAVA_HOME/bin:$PATH
```

2.6. Virtualization and Cloud Platforms

HDP is certified and supported when running on virtual or cloud platforms (for example, VMware vSphere or Amazon Web Services EC2) as long as the respective guest operating system (OS) is supported by HDP and any issues detected on these platforms are reproducible on the same supported OS installed on bare metal.

See Operating Systems Requirements for the list of supported operating systems for HDP.