mount_and_restart.sh

#!/bin/bash

: ${RAMDISK_SIZE=1024}
echo "Mounting on ramdisk with size ${RAMDISK_SIZE}..."
sudo mount -t tmpfs -o size=${RAMDISK_SIZE}M tmpfs /tmp/ramdisk

echo "Stopping Cassandra and configuring settings..."
pkill cassandra

: ${CASSANDRA_RPC_ADDRESS='0.0.0.0'}

: ${CASSANDRA_LISTEN_ADDRESS='auto'}
if [ "$CASSANDRA_LISTEN_ADDRESS" = 'auto' ]; then
	CASSANDRA_LISTEN_ADDRESS="$(hostname --ip-address)"
fi

: ${CASSANDRA_BROADCAST_ADDRESS="$CASSANDRA_LISTEN_ADDRESS"}

if [ "$CASSANDRA_BROADCAST_ADDRESS" = 'auto' ]; then
	CASSANDRA_BROADCAST_ADDRESS="$(hostname --ip-address)"
fi
: ${CASSANDRA_BROADCAST_RPC_ADDRESS:=$CASSANDRA_BROADCAST_ADDRESS}

if [ -n "${CASSANDRA_NAME:+1}" ]; then
	: ${CASSANDRA_SEEDS:="cassandra"}
fi
: ${CASSANDRA_SEEDS:="$CASSANDRA_BROADCAST_ADDRESS"}


sed -ri 's/(- seeds:) "127.0.0.1"/\1 "'"$CASSANDRA_SEEDS"'"/' "$CASSANDRA_CONFIG/cassandra.yaml"

for yaml in \
		broadcast_address \
		broadcast_rpc_address \
		cluster_name \
		endpoint_snitch \
		listen_address \
		num_tokens \
		rpc_address \
		start_rpc \
	; do
		var="CASSANDRA_${yaml^^}"
		val="${!var}"
		if [ "$val" ]; then
			sed -ri 's/^(# )?('"$yaml"':).*/\2 '"$val"'/' "$CASSANDRA_CONFIG/cassandra.yaml"
		fi
	done

echo "Restarting Cassandra..."
exec cassandra -R -f