# Cassandra

Since <a href="https://github.com/testcontainers/testcontainers-go/releases/tag/v0.26.0"><span class="tc-version">:material-tag: v0.26.0</span></a>

## Introduction

The Testcontainers module for Cassandra.

## Adding this module to your project dependencies

Please run the following command to add the Cassandra module to your Go dependencies:

```
go get github.com/testcontainers/testcontainers-go/modules/cassandra
```

## Usage example

<!--codeinclude-->
[Creating a Cassandra container](../../modules/cassandra/examples_test.go) inside_block:runCassandraContainer
<!--/codeinclude-->

## Module Reference

### Run function

- Since <a href="https://github.com/testcontainers/testcontainers-go/releases/tag/v0.32.0"><span class="tc-version">:material-tag: v0.32.0</span></a>

!!!info
    The `RunContainer(ctx, opts...)` function is deprecated and will be removed in the next major release of _Testcontainers for Go_.

The Cassandra module exposes one entrypoint function to create the Cassandra container, and this function receives three parameters:

```golang
func Run(ctx context.Context, img string, opts ...testcontainers.ContainerCustomizer) (*CassandraContainer, error)
```

- `context.Context`, the Go context.
- `string`, the Docker image to use.
- `testcontainers.ContainerCustomizer`, a variadic argument for passing options.

#### Image

Use the second argument in the `Run` function to set a valid Docker image.
In example: `Run(context.Background(), "cassandra:4.1.3")`.

### Container Options

When starting the Cassandra container, you can pass options in a variadic way to configure it.

#### WithInitScripts

- Since <a href="https://github.com/testcontainers/testcontainers-go/releases/tag/v0.26.0"><span class="tc-version">:material-tag: v0.26.0</span></a>

If you would like to do additional initialization in the Cassandra container, add one or more `*.cql` or `*.sh` scripts to the container request with the `WithInitScripts` function.
Those files will be copied after the container is created but before it's started under root directory.

An example of a `*.sh` script that creates a keyspace and table is shown below:

<!--codeinclude-->
[Init script content](../../modules/cassandra/testdata/init.sh)
<!--/codeinclude-->

#### WithConfigFile

- Since <a href="https://github.com/testcontainers/testcontainers-go/releases/tag/v0.26.0"><span class="tc-version">:material-tag: v0.26.0</span></a>

In the case you have a custom config file for Cassandra, it's possible to copy that file into the container before it's started, using the `WithConfigFile(cfgPath string)` function.

!!!warning
    You should provide a valid Cassandra configuration file, otherwise the container will fail to start.

#### WithTLS

- Since <a href="https://github.com/testcontainers/testcontainers-go/releases/tag/v0.41.0"><span class="tc-version">:material-tag: v0.41.0</span></a>

If you need to enable TLS/SSL encryption for client connections, you can use the `cassandra.WithTLS()` option. 

When enabled, the container will:
- Generate self-signed certificates automatically
- Configure Cassandra to use client encryption
- Expose the SSL port (9142)

Use the `TLSConfig()` method on the returned container to get the `*tls.Config` for client connections. The method returns an error if TLS was not enabled via `WithTLS()`.

<!--codeinclude-->
[Creating a Cassandra container with TLS](../../modules/cassandra/examples_test.go) inside_block:runCassandraContainerWithTLS
[Getting TLS connection configuration](../../modules/cassandra/examples_test.go) inside_block:getTLSConnectionHost
<!--/codeinclude-->

{% include "../features/common_functional_options_list.md" %}

### Container Methods

The Cassandra container exposes the following methods:

#### ConnectionHost

- Since <a href="https://github.com/testcontainers/testcontainers-go/releases/tag/v0.26.0"><span class="tc-version">:material-tag: v0.26.0</span></a>

This method returns the host and port of the Cassandra container, using the default, `9042/tcp` port. E.g. `localhost:9042`

<!--codeinclude-->
[Get connection host](../../modules/cassandra/cassandra_test.go) inside_block:connectionHost
<!--/codeinclude-->

#### TLSConfig

- Since <a href="https://github.com/testcontainers/testcontainers-go/releases/tag/v0.41.0"><span class="tc-version">:material-tag: v0.41.0</span></a>

This method returns the TLS configuration for secure connections to the Cassandra container. It can only be used when the container was created with the `WithTLS()` option. Returns an error if TLS was not enabled.

<!--codeinclude-->
[Get TLS config](../../modules/cassandra/cassandra_test.go) inside_block:tlsConfig
<!--/codeinclude-->