Bash script to create MongoDB replica set.

create_replica_set.sh

#!/bin/sh

MONGO=../mongo/bin
NUMBER_OF_NODES=$1
REPLICA_NAME=rs
PORT=27017

if [[ -z "$1" ]];
then
  NUMBER_OF_NODES=3
fi

mkdir -p $(eval echo data/rs{0..$NUMBER_OF_NODES})

for ((i=0; i < $NUMBER_OF_NODES; i++));
do
	$MONGO/mongod --replSet $REPLICA_NAME --logpath $REPLICA_NAME.$i.log --dbpath data/rs$i --port $(($PORT+i)) --fork
done

sleep 2

CONFIG="var config = { _id: \"$REPLICA_NAME\", members: ["
for ((i=0; i < $NUMBER_OF_NODES; i++));
do
	CONFIG+="{ _id: $i, host: \"localhost:$(($PORT+i))\" }"
	if [[ $((i+1)) -lt $NUMBER_OF_NODES ]];
	then
		CONFIG+=", "
	fi
done
CONFIG+="]};"
CONFIG+="rs.initiate(config);"

$MONGO/mongo <<< $CONFIG