m-creations/docker-openwrt-cassandra

Cassandra 2.1.0 Docker image based on OpenWrt

Cassandra 2.1.2 as a Docker container. For development use only.

Quickstart

Single Node

Without arguments, the container starts the C* server:

docker run -d --name cass mcreations/openwrt-cassandra

You can also use the container for the client tools (cqlsh etc.) by passing the tool and its arguments to the docker run command:

docker run -it --link cass:cass mcreations/openwrt-cassandra cqlsh cass

docker run -it --link cass:cass mcreations/openwrt-cassandra nodetool -h cass

Configuration Details

Cassandra server is started with the following settings which can also be passed with docker run -e:

• MAX_HEAP_SIZE 1 GB
• HEAP_NEWSIZE 100 MB
• CLUSTER_NAME the name of the cluster, default is 'testcluster'
• SEEDS is set to the IP of the running container
• DC data center used by GossipingPropertyFileSnitch, default is 'dc1'
• RACK rack, default is 'r1'
• OPS_IP optional address of OpsCenter
• CASS_PASS password of the user 'cassandra'; default value is 'cassandra' (specify this only on the first seed node, when creating a cluster)
• data directory is /data

This is a sample command line with custom parameters:

docker run -d --name cass1 -v /data/cass1:/data -e CASS_PASS=ffPufPPVD4U4V9sZ \
           -e MAX_HEAP_SIZE=600m -e HEAP_NEWSIZE=40m \
           -e CLUSTER_NAME=mycluster -e OPS_IP=192.168.1.1 \
           mcreations/openwrt-cassandra

For the complete details of the configuration, please see

• start-cassandra
• cassandra-env.sh.in

Multiple Nodes

Follow the single node setup to get the first node running and keep track of its IP. Run the following to launch the other nodes in the cluster:

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

for name in cass{2..5}; do
  echo "Starting node $name"
  docker run -d --name $name -v /data/$name:/data -e MAX_HEAP_SIZE=600m -e HEAP_NEWSIZE=100m -e CLUSTER_NAME=testcluster -e OPS_IP=192.168.1.1 -e SEEDS=$SEED_IP mcreations/openwrt-cassandra
  sleep 30
done

Once all the nodes are up, check cluster status using:

nodetool --host $SEED_IP status