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5-Node Cassandra Cluster. 1 Command.

[2014-09-16] Update: The command now brings up a 5-node Cassandra cluster in addition to DataStax OpsCenter 5.0.0 and wires it all up together. See the GitHub repo for details. Each node runs in its own container with the Cassandra process + DataStax Agent while OpsCenter runs in its own container separate from the cluster.

[Original Post]

Run this command to bring up a 5-node Cassandra (2.1.0) cluster locally using Docker.

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bash <(curl -sL http://bit.ly/docker-cassandra)

This will:
1. Pull the abh1nav/cassandra:latest image.
2. Start the first node with the name cass1
3. Start cass2..5 with the environment variable SEED=<ip of cass1>

Manual mode

If you don’t like or trust the one liner, here’s how to do it manually.

Single Node Setup

To start the first node, pull the latest version of image:

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docker pull abh1nav/cassandra:latest

Start the first instance:

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docker run -d --name cass1 abh1nav/cassandra:latest

Grab its IP using:

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SEED_IP=$(docker inspect -f '{{ .NetworkSettings.IPAddress }}' cass1)

Connect to it using cqlsh:

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cqlsh $SEED_IP

The expected output is:

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✈ megatron /opt/cassandra
 ↳ bin/cqlsh $SEED_IP
Connected to Test Cluster at 172.17.0.47:9160.
[cqlsh 4.1.1 | Cassandra 2.1.0 | CQL spec 3.1.1 | Thrift protocol 19.39.0]
Use HELP for help.
cqlsh>

Cluster Setup

Once your single node is setup, you can add more nodes using:

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for name in cass{2..5}; do
  echo "Starting node $name"
  docker run -d --name $name -e SEED=$SEED_IP abh1nav/cassandra:latest
  sleep 10
done

You can watch the cluster form by tailing the logs on cass1:

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docker logs -f cass1

Once the cluster is up, you can check its status using:

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nodetool --host $SEED_IP status

The expected output is:

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✈ megatron /opt/cassandra
 ↳ bin/nodetool --host $SEED_IP status
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address      Load       Tokens  Owns (effective)  Host ID                               Rack
UN  172.17.0.47  54.99 KB   256     37.3%             cb925207-ff79-4d1e-84ce-ac6c59353df4  rack1
UN  172.17.0.48  85.8 KB    256     39.4%             baa1b2c1-8f51-4e20-9c33-44cb5f45a4c0  rack1
UN  172.17.0.49  69.35 KB   256     40.1%             d1f96d59-c084-4ba3-a717-4269098cc854  rack1
UN  172.17.0.50  68.92 KB   256     40.2%             d514e844-e07a-4896-ace8-a0b43e25d6fc  rack1
UN  172.17.0.51  69.39 KB   256     43.0%             464cdf00-39e3-4efe-8a9f-83fc5ba839c9  rack1

Check out the Docker registry page for the image and the GitHub repo to grab the source.