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puppet-cassandra

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Installs Cassandra & DataStax Agent on RHEL/Ubuntu/Debian.

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# Cassandra

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## Table of Contents

- [Cassandra](#cassandra)
  - [Table of Contents](#table-of-contents)
  - [Overview](#overview)
  - [Setup](#setup)
    - [What Cassandra affects](#what-cassandra-affects)
      - [What the Cassandra class affects](#what-the-cassandra-class-affects)
    - [Requirements](#requirements)
    - [Beginning with Cassandra](#beginning-with-cassandra)
    - [Hiera](#hiera)
  - [Usage](#usage)
    - [Setup a keyspace and users](#setup-a-keyspace-and-users)
    - [Create a Cluster in a Single Data Center](#create-a-cluster-in-a-single-data-center)
    - [Create a Cluster in Multiple Data Centers](#create-a-cluster-in-multiple-data-centers)
  - [Reference](#reference)
  - [Limitations](#limitations)
  - [Migrating to new module version](#migrating-to-new-module-version)
  - [Development](#development)
    - [Additional Contributers](#additional-contributers)

## Overview

Module to install, configure and manage Cassandra.

## Setup

### What Cassandra affects

#### What the Cassandra class affects

- Optionally configures a repository to install the Cassandra packages.
- Installs the Cassandra package.
- Installs the Cassandra support tools
- Optionally configures settings in `${config_path}/cassandra.yaml`.
- Optionally installs a JRE/JDK package (e.g. java-1.8.0-openjdk-headless) and the Java Native Access (JNA).
- Optionally ensures that the Cassandra service is enabled and running.

### Requirements

You need a compatible version of Java installed.
You can use [puppetlabs/java](https://github.com/puppetlabs/puppetlabs-java) module or set `cassandra::java_package`.

On Debian systems there's a soft dependency on [puppetlabs/apt](https://github.com/puppetlabs/puppetlabs-apt) module.

When using `cassandra::schema` resources you also need a compatible version of Python installed.

### Beginning with Cassandra

Create a cassandra cluster called MyCassandraCluster which uses the
GossipingPropertyFileSnitch and password authentication.  In this very
basic example the node itself becomes a seed for the cluster and the
credentials will default to a user called cassandra with a password
called of cassandra.

```puppet
class { 'cassandra':
  baseline_settings => {
    authenticator               => 'AllowAllAuthenticator',
    authorizer                  => 'AllowAllAuthorizer',
    cluster_name                => 'MyCassandraCluster',
    commitlog_sync              => 'periodic',
    commitlog_sync_period_in_ms => 10000,
    listen_interface            => $facts['networking']['primary'],
    endpoint_snitch             => 'SimpleSnitch',
    partitioner                 => 'org.apache.cassandra.dht.Murmur3Partitioner',
    seed_provider               => [
      {
        class_name => 'org.apache.cassandra.locator.SimpleSeedProvider',
        parameters => [
          {
            seeds => $facts['networking']['ip']
          },
        ],
      },
    ],
  },
}
```

However, **PLEASE** note that this is the **ABSOLUTE MINIMUM** configuration
to get Cassandra up and running but will probably give you a rather badly
configured node.  Please see
[Suggested Baseline Settings](https://github.com/voxpupuli/puppet-cassandra/wiki/Suggested-Baseline-Settings)
for details on making your configuration a lot more robust.

### Hiera

In your top level node classification (usually `common.yaml`), add the
settings hash and all the tweaks you want all the clusters to use:

```YAML
cassandra::baseline_settings:
  authenticator: AllowAllAuthenticator
  authorizer: AllowAllAuthorizer
  auto_bootstrap: true
  auto_snapshot: true
  ...
```

Then, in the individual node classification add the parts which define
the cluster:

```YAML
cassandra::settings:
  cluster_name: developer playground cassandra cluster
cassandra::dc: Onsite1
cassandra::rack: RAC1
cassandra::package_ensure: 3.0.5-1
cassandra::package_name: cassandra30
```

## Usage

### Setup a keyspace and users

We assume that authentication has been enabled for the cassandra
cluster and we are connecting with the default user name and password
('cassandra/cassandra').

In this example, we create a keyspace (mykeyspace) with a table called
'users' and an index called 'users_lname_idx'.

We also add three users (to Cassandra, not the mykeyspace.users
table) called spillman, akers and boone while ensuring that a user
called lucan is absent.

```puppet
class { 'cassandra':
  ...
}

class { 'cassandra::schema':
  cqlsh_password => 'cassandra',
  cqlsh_user     => 'cassandra',
  cqlsh_host     => $facts['networking']['ip'],
  indexes        => {
    'users_lname_idx' => {
      table    => 'users',
      keys     => 'lname',
      keyspace => 'mykeyspace',
    },
  },
  keyspaces      => {
    'mykeyspace' => {
      durable_writes  => false,
      replication_map => {
        keyspace_class     => 'SimpleStrategy',
        replication_factor => 1,
      },
    }
  },
  permissions    => {
    'Grant select permissions to spillman to all keyspaces' => {
      permission_name => 'SELECT',
      user_name       => 'spillman',
    },
    'Grant modify to to keyspace mykeyspace to akers'       => {
      keyspace_name   => 'mykeyspace',
      permission_name => 'MODIFY',
      user_name       => 'akers',
    },
    'Grant alter permissions to mykeyspace to boone'        => {
      keyspace_name   => 'mykeyspace',
      permission_name => 'ALTER',
      user_name       => 'boone',
    },
    'Grant ALL permissions to mykeyspace.users to gbennet'  => {
      keyspace_name   => 'mykeyspace',
      permission_name => 'ALTER',
      table_name      => 'users',
      user_name       => 'gbennet',
    },
  },
  tables         => {
    'users' => {
      columns  => {
        user_id       => 'int',
        fname         => 'text',
        lname         => 'text',
        'PRIMARY KEY' => '(user_id)',
      },
      keyspace => 'mykeyspace',
    },
  },
  users          => {
    'spillman' => {
      password => 'Niner27',
    },
    'akers'    => {
      password  => 'Niner2',
      superuser => true,
    },
    'boone'    => {
      password => 'Niner75',
    },
    'gbennet'  => {
      'password' => 'foobar',
    },
    'lucan'    => {
      'ensure' => absent
    },
  },
}
```

### Create a Cluster in a Single Data Center

This is a basic example of a six node cluster with two seeds to be created in
a single data center spanning two racks.  The nodes in the cluster are:

**Node Name**  | **IP Address** |
---------------|----------------|
node0 (seed 1) | 110.82.155.0   |
node1          | 110.82.155.1   |
node2          | 110.82.155.2   |
node3 (seed 2) | 110.82.156.3   |
node4          | 110.82.156.4   |
node5          | 110.82.156.5   |

Each node is configured to use the GossipingPropertyFileSnitch and 256 virtual nodes (vnodes).
The name of the cluster is 'MyCassandraCluster'.
Also, while building the initial cluster, we are setting the auto_bootstrap to false.

In this example, we are going to expand the example by:

```puppet
node /^node\d+$/ {
  class { 'cassandra':
    settings => {
      'authenticator'               => 'AllowAllAuthenticator',
      'auto_bootstrap'              => false,
      'cluster_name'                => 'MyCassandraCluster',
      'commitlog_directory'         => '/var/lib/cassandra/commitlog',
      'commitlog_sync'              => 'periodic',
      'commitlog_sync_period_in_ms' => 10000,
      'data_file_directories'       => ['/var/lib/cassandra/data'],
      'endpoint_snitch'             => 'GossipingPropertyFileSnitch',
      'hints_directory'             => '/var/lib/cassandra/hints',
      'listen_interface'            => 'eth1',
      'num_tokens'                  => 256,
      'partitioner'                 => 'org.apache.cassandra.dht.Murmur3Partitioner',
      'saved_caches_directory'      => '/var/lib/cassandra/saved_caches',
      'seed_provider'               => [
        {
          'class_name' => 'org.apache.cassandra.locator.SimpleSeedProvider',
          'parameters' => [
            {
              'seeds' => '110.82.155.0,110.82.156.3',
            },
          ],
        },
      ],
      'start_native_transport'      => true,
    },
  }
}
```

The default value for the num_tokens is already 256, but it is
included in the example for clarity.  Do not forget to either
set auto_bootstrap to true or not set the attribute at all
after initializing the cluster.

### Create a Cluster in Multiple Data Centers

**Node Name**  | **IP Address** | **Data Center** | **Rack** |
---------------|----------------|-----------------|----------|
node0 (seed 1) | 10.168.66.41   | DC1             | RAC1     |
node1          | 10.176.43.66   | DC1             | RAC1     |
node2          | 10.168.247.41  | DC1             | RAC1     |
node3 (seed 2) | 10.176.170.59  | DC2             | RAC1     |
node4          | 10.169.61.170  | DC2             | RAC1     |
node5          | 10.169.30.138  | DC2             | RAC1     |

For the sake of simplicity, we will confine this example to the nodes:

```puppet
node /^node[012]$/ {
  class { 'cassandra':
    dc             => 'DC1',
    settings       => {
      'authenticator'               => 'AllowAllAuthenticator',
      'auto_bootstrap'              => false,
      'cluster_name'                => 'MyCassandraCluster',
      'commitlog_directory'         => '/var/lib/cassandra/commitlog',
      'commitlog_sync'              => 'periodic',
      'commitlog_sync_period_in_ms' => 10000,
      'data_file_directories'       => ['/var/lib/cassandra/data'],
      'endpoint_snitch'             => 'GossipingPropertyFileSnitch',
      'hints_directory'             => '/var/lib/cassandra/hints',
      'listen_interface'            => 'eth1',
      'num_tokens'                  => 256,
      'partitioner'                 => 'org.apache.cassandra.dht.Murmur3Partitioner',
      'saved_caches_directory'      => '/var/lib/cassandra/saved_caches',
      'seed_provider'               => [
        {
          'class_name' => 'org.apache.cassandra.locator.SimpleSeedProvider',
          'parameters' => [
            {
              'seeds' => '110.82.155.0,110.82.156.3',
            },
          ],
        },
      ],
      'start_native_transport'      => true,
    },
  }
}

node /^node[345]$/ {
  class { 'cassandra':
    dc             => 'DC2',
    settings       => {
      'authenticator'               => 'AllowAllAuthenticator',
      'auto_bootstrap'              => false,
      'cluster_name'                => 'MyCassandraCluster',
      'commitlog_directory'         => '/var/lib/cassandra/commitlog',
      'commitlog_sync'              => 'periodic',
      'commitlog_sync_period_in_ms' => 10000,
      'data_file_directories'       => ['/var/lib/cassandra/data'],
      'endpoint_snitch'             => 'GossipingPropertyFileSnitch',
      'hints_directory'             => '/var/lib/cassandra/hints',
      'listen_interface'            => 'eth1',
      'num_tokens'                  => 256,
      'partitioner'                 => 'org.apache.cassandra.dht.Murmur3Partitioner',
      'saved_caches_directory'      => '/var/lib/cassandra/saved_caches',
      'seed_provider'               => [
        {
          'class_name' => 'org.apache.cassandra.locator.SimpleSeedProvider',
          'parameters' => [
            {
              'seeds' => '110.82.155.0,110.82.156.3',
            },
          ],
        },
      ],
      'start_native_transport'      => true,
    },
  }
}
```

We don't need to specify the rack name (with the rack attribute) as RAC1 is
the default value.  Again, do not forget to either set auto_bootstrap to
true or not set the attribute at all after initializing the cluster.

## Reference

The reference documentation is generated using the
[puppet-strings](https://github.com/puppetlabs/puppet-strings) tool.  To see
all of it, please go to
[http://voxpupuli.github.io/puppet-cassandra](http://voxpupuli.github.io/puppet-cassandra/_index.html).

## Limitations

- When creating key spaces, indexes, cql_types and users the settings will only
be used to create a new resource if it does not currently exist.  If a change
is made to the Puppet manifest but the resource already exits, this change
will not be reflected.

## Migrating to new module version

New version (>3.1) of this module drops some build-in resources like firewall and sysctl but they can be replaced.
See [examples](./examples)

## Development

Contributions will be gratefully accepted.  Please go to the project page,
fork the project, make your changes locally and then raise a pull request.
Details on how to do this are available at
https://guides.github.com/activities/contributing-to-open-source.

Please also see the
[CONTRIBUTING.md](./CONTRIBUTING.md)
page for project specific requirements.

### Additional Contributers

For a list of contributers see
[CONTRIBUTING.md](./CONTRIBUTING.md)
and https://github.com/voxpupuli/puppet-cassandra/graphs/contributors

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