Cassandra single instance Docker

Dockerfile

FROM abh1nav/java7

# Download and extract Cassandra
RUN \
  mkdir /opt/cassandra; \
  wget -O - http://www.us.apache.org/dist/cassandra/2.1.2/apache-cassandra-2.1.2-bin.tar.gz \
  | tar xzf - --strip-components=1 -C "/opt/cassandra";

ADD cassandra.yaml /opt/cassandra/conf/
ADD run.sh /tmp/

# Expose ports
EXPOSE 7199

WORKDIR /opt/cassandra

CMD ["/tmp/run.sh"]

run.sh

#!/bin/bash

# Grab the container IP
ADDR=$(/sbin/ifconfig eth0 | grep 'inet addr' | cut -d: -f2 | awk '{print $1}')
echo "IP Address is: $ADDR"

# Check if a seed was provided
SEED=${SEED:=$ADDR}
echo "Seed is: $SEED"

if [ ! -f /root/.cassconfig ]; then
    echo "Filling in the blanks inside cassandra.yaml"
    # Target files
    ENV_FILE=/opt/cassandra/conf/cassandra-env.sh
    CONF_FILE=/opt/cassandra/conf/cassandra.yaml
    # Add heap settings
    echo MAX_HEAP_SIZE="4G" >> $ENV_FILE
    echo HEAP_NEWSIZE="800M" >> $ENV_FILE
    # Add broadcast IPs
    echo "listen_address: $ADDR" >> $CONF_FILE
    echo "broadcast_rpc_address: $ADDR" >> $CONF_FILE
    echo "rpc_address: 0.0.0.0" >> $CONF_FILE
    # Add seed info
    echo "seed_provider:" >> $CONF_FILE
    echo "  - class_name: org.apache.cassandra.locator.SimpleSeedProvider" >> $CONF_FILE
    echo "    parameters:" >> $CONF_FILE
    echo "      - seeds: \"$SEED\"" >> $CONF_FILE
    touch /root/.cassconfig
fi

# Start server
cd /opt/cassandra
bin/cassandra -f