Install DataStax Enterprise 6.9 on Debian-based systems using APT

Use these instructions for installing DataStax Enterprise (DSE) 6.9 on Debian-based systems using APT.

Some things to know about installing DataStax Enterprise

These instructions apply to all versions of DSE 6.9. For specific changes please see the DataStax Enterprise 6.9 release notes.
When installed from a package (Yum or APT), DSE 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 6.9 and the DataStax Agent. It does not install OpsCenter, DataStax Studio, or DataStax Bulk Loader.
When connecting to DSE 6.9 from OpsCenter, use OpsCenter version 6.8; earlier versions are not supported.

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.
Aptitude Package Management (APT) application.
Configure your operating system to use the latest version of Java 11:
- Recommended. The latest build of a TCK (Technology Compatibility Kit) Certified OpenJDK version 11.
- Supported. Oracle Java SE 11 (JRE or JDK).
Python 3.8-3.11 required for running cqlsh.

Hardware requirements

See Recommended production settings.

Install DSE 6.9 on Debian-based systems using APT

In a terminal window:

Verify that a required version of Java is installed:

java -version

If OpenJDK, the results should look like:

openjdk version "11.0.x" 2024-06-18
OpenJDK Runtime Environment (build 11.0.x+xx)
OpenJDK 64-Bit Server VM (build 11.0.x+xx, mixed mode)

If Oracle Java, the results should look like:

java version "11.0.x" YYYY-MM-DD LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.x+xx-LTS)
Java HotSpot(TM) 64-Bit Server VM (build 11.0.x+xx-LTS, mixed mode)

DataStax recommends the latest build of a Technology Compatibility Kit (TCK) Certified OpenJDK version 11.

Install the libaio package. For example:
```
sudo apt-get install libaio1
```

Add a DataStax repository file called /etc/apt/sources.list.d/datastax.sources.list:

echo "deb https://debian.datastax.com/enterprise/ stable main" | sudo tee -a /etc/apt/sources.list.d/datastax.sources.list

Add the DataStax repository key:

curl -L https://debian.datastax.com/debian/repo_key | sudo apt-key add -

Update the packages:
```
sudo apt-get update
```

Install the DSE packages:

Specify all packages; otherwise, the installation fails.

Install the latest version (6.9.x):
```
sudo apt-get install dse-full
```

Install an earlier DSE 6.9.x version:

sudo apt-get install dse=version_number-1 \
    dse-full=version_number-1 \
    dse-libcassandra=version_number-1 \
    dse-libgraph=version_number-1 \
    dse-libhadoop2-client-native=version_number-1 \
    dse-libhadoop2-client=version_number-1 \
    dse-liblog4j=version_number-1 \
    dse-libsolr=version_number-1 \
    dse-libspark=version_number-1 \
    dse-libtomcat=version_number-1

For example:

sudo apt-get install dse=6.9.0-1 \
    dse-full=6.9.0-1 \
    dse-libcassandra=6.9.0-1 \
    dse-libgraph=6.9.0-1 \
    dse-libhadoop2-client-native=6.9.0-1 \
    dse-libhadoop2-client=6.9.0-1 \
    dse-liblog4j=6.9.0-1 \
    dse-libsolr=6.9.0-1 \
    dse-libspark=6.9.0-1 \
    dse-libtomcat=6.9.0-1

Optional: Install the demos:

Installing the DSE demos is not recommended for production. Only install the demos in development environments to run tutorials.
```
sudo apt-get install dse-demos=version_number-1
```

DSE 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.
DSE provides several types of workloads (default is transactional). See startup options for service or stand-alone installations.
Next Steps provides links to related tasks and information.

Start DSE

Single-node cluster installations only:

Start DSE:
```
sudo service dse start
```

Verify that DSE is running by entering the nodetool status command:

nodetool status

Review the output to verify that DSE is running:

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

Next Steps

Change or delete the default cassandra user.
Connect to DSE using the cqlsh tool.
Configure start up options.
If performing an upgrade, go to the next step in the Upgrade Guide.
Configure DataStax Enterprise settings for DSE Advanced Security, DSE In-Memory, DSE Advanced Replication, DSE Multi-Instance, DSE Tiered Storage, and more.
Review the default file locations for package installations.
Change the logging locations after installation.
Start and stop DataStax Enterprise.
Prepare DataStax Enterprise for production.
Review the recommended production settings.
Plan and test DataStax Enterprise cluster deployments.
Configure the heap dump directory to avoid server crashes.
Install DSE-compatible drivers.