Installing DataStax Enterprise 6.0 on RHEL-based systems using Yum

Instructions for installing DataStax Enterprise 6.0 using Yum repositories on RHEL-based systems.

Instructions for installing DataStax Enterprise (DSE) 6.0 on RHEL-based systems using Yum.

To install on SUSE, use the binary tarball installation.

Some things to know about installing DataStax Enterprise:

The latest version of DataStax Enterprise 6.0 is 6.0.15.
When installed from a package (Yum or APT), DataStax Enterprise runs as a service. The service initialization script is located in /etc/init.d/dse. Run levels are not set by the package.
This procedure installs DSE 6.0 and the DataStax Agent. It does not install OpsCenter, DataStax Studio, Graph Loader, or DataStax Bulk Loader.
When connecting to DSE 6.0 from OpsCenter, use version OpsCenter 6.5; earlier versions are not supported. See DataStax OpsCenter compatibility with DSE.

Warning: When DSE is installed, it creates a cassandra user in the database. Do not use the cassandra user in production. Failing to do so is a security risk. See Adding a superuser login.

Prerequisites

Root or sudo access.
A supported platform.
Yum Package Management application.
Configure your operating system to use the latest version of Java 8:
- Recommended. The latest build of a TCK (Technology Compatibility Kit) Certified OpenJDK version 8. For example, OpenJDK 8 (1.8.0_242 minimum). DataStax's recommendation changed due to the end of public updates for Oracle JRE/JDK 8. See Oracle Java SE Support Roadmap.
- Supported. Oracle Java SE 8 (JRE or JDK) (1.8.0_151 minimum)
RedHat-compatible distributions require EPEL (Extra Packages for Enterprise Linux).
Python 2.7.x
For older RHEL distributions, see Installing Python 2.7 on older RHEL-based package installations.

Note: For more information about managing Java, see Managing Java installs.

Hardware requirements

See Recommended production settings.

Important: End User License Agreement (EULA). By downloading this DataStax product, you agree to the terms of the EULA.

In a terminal window:

Verify that a required version of Java is installed:
```
java -version
```
Note: DataStax recommends the latest build of a Technology Compatibility Kit (TCK) Certified OpenJDK version 8.
If OpenJDK, the results should look like:
```
openjdk version "1.8.0_171"
OpenJDK Runtime Environment (build 1.8.0_171-8u171-b11-0ubuntu0.16.04.1-b11)
OpenJDK 64-Bit Server VM (build 25.171-b11, mixed mode)
```
If Oracle Java, the results should look like:
```
java version "1.8.0_181"
Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)
```
If not OpenJDK 8 or Oracle Java 8, see Installing the JDK..
Install the libaio package. For example:
```
sudo yum install libaio
```
Add the DataStax Yum repository to a file called /etc/yum.repos.d/datastax.repo:
Note: Set the gpgcheck=1 to perform a GPG signature check.
```
[datastax] 
name=DataStax Repo for DataStax Enterprise
baseurl=https://rpm.datastax.com/enterprise/
enabled=1
gpgcheck=0
```
If you have enabled signature verification (gpgcheck=1), import the DataStax Enterprise repository key:
```
sudo rpm --import https://rpm.datastax.com/rpm/repo_key 
```
Install the DataStax Enterprise packages:

Attention: Specify all packages; otherwise, the installation fails.
- Install any 6.0.x version:
  Note: To view the available 6.0.x versions, see the Release notes.
```
sudo yum install  dse-6.0.version_number-1 \
    dse-full-6.0.version_number-1 \
    dse-libgraph-6.0.version_number-1 \
    dse-libcassandra-6.0.version_number-1 \
    dse-libhadoop2-client-6.0.version_number-1 \
    dse-libsolr-6.0.version_number-1 \
    dse-libtomcat-6.0.version_number-1 \
    dse-liblog4j-6.0.version_number-1 \
    dse-libspark-6.0.version_number-1
```
  For example:
```
sudo yum install dse-6.0.15-1 \
    dse-full-6.0.15-1 \
    dse-libgraph-6.0.15-1 \
    dse-libcassandra-6.0.15-1 \
    dse-libhadoop2-client-6.0.15-1 \
    dse-libsolr-6.0.15-1 \
    dse-libtomcat-6.0.15-1 \
    dse-liblog4j-6.0.15-1 \
    dse-libspark-6.0.15-1
```
- Optional: Install the demos:
  Attention: Installing the DSE demos is not recommended for production. Only install the demos in development environments to run tutorials.
```
sudo yum install dse-demos-version_number-1
```
Result
DataStax Enterprise is ready for additional configuration:
- For production, be sure to change the cassandra user. Failing to do so is a security risk. See Adding a superuser login.
- DataStax Enterprise provides several types of workloads (default is transactional). See startup options for service or stand-alone installations.
- What's next below provides links to related tasks and information.
Optional: Configure systemd units: RedHat systemd configuration.

Optional: Single-node cluster installations only:

Start DataStax Enterprise:
```
sudo service dse start
```

Verify that DataStax Enterprise is running:

nodetool status

Results using vnodes:

Datacenter: Cassandra
=====================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address    Load       Tokens  Owns    Host ID                               Rack
UN  127.0.0.1  82.43 KB   128     ?       40725dc8-7843-43ae-9c98-7c532b1f517e  rack1

What's next

You must change or delete the cassandra user created on installation. See Adding a superuser login.
Configure startup options: service | stand-alone.
If performing an upgrade, go to the next step in the Upgrade Guide.
Configuring DataStax Enterprise - Settings for DSE Advanced Security, In-Memory, DSE Advanced Replication, DSE Multi-Instance, DSE Tiered Storage, and more.
Default file locations for package installations
Default file locations for tarball installations
Changing logging locations after installation.
Starting and stopping DataStax Enterprise.
Preparing DataStax Enterprise for production.
Recommended production settings.
Planning and testing DSE cluster deployments.
Configuring the heap dump directory to avoid server crashes.
DataStax Studio documentation.
Installing DataStax Enterprise drivers.