This simple script will help to you run sharing with multiple replica set on your local box. This makes very cool and uplifting, (if on linux use sudo / root to run shell script or commands manually. )
# MongoDB
# script to start a sharded environment on localhost
# clean everything up
echo "killing mongod and mongos"
killall mongod
killall mongos
echo "removing data files"
rm -rf /data/config
rm -rf /data/shard*
# start a replica set and tell it that it will be shard0
echo "starting servers for shard 0"
mkdir -p /data/shard0/rs0 /data/shard0/rs1 /data/shard0/rs2
mongod --replSet s0 --logpath "s0-r0.log" --dbpath /data/shard0/rs0 --port 37017 --fork --shardsvr --smallfiles
mongod --replSet s0 --logpath "s0-r1.log" --dbpath /data/shard0/rs1 --port 37018 --fork --shardsvr --smallfiles
mongod --replSet s0 --logpath "s0-r2.log" --dbpath /data/shard0/rs2 --port 37019 --fork --shardsvr --smallfiles
sleep 5
# connect to one server and initiate the set
echo "Configuring s0 replica set"
mongo --port 37017 << 'EOF'
config = { _id: "s0", members:[
{ _id : 0, host : "localhost:37017" },
{ _id : 1, host : "localhost:37018" },
{ _id : 2, host : "localhost:37019" }]};
rs.initiate(config)
EOF
# start a replicate set and tell it that it will be a shard1
echo "starting servers for shard 1"
mkdir -p /data/shard1/rs0 /data/shard1/rs1 /data/shard1/rs2
mongod --replSet s1 --logpath "s1-r0.log" --dbpath /data/shard1/rs0 --port 47017 --fork --shardsvr --smallfiles
mongod --replSet s1 --logpath "s1-r1.log" --dbpath /data/shard1/rs1 --port 47018 --fork --shardsvr --smallfiles
mongod --replSet s1 --logpath "s1-r2.log" --dbpath /data/shard1/rs2 --port 47019 --fork --shardsvr --smallfiles
sleep 5
echo "Configuring s1 replica set"
mongo --port 47017 << 'EOF'
config = { _id: "s1", members:[
{ _id : 0, host : "localhost:47017" },
{ _id : 1, host : "localhost:47018" },
{ _id : 2, host : "localhost:47019" }]};
rs.initiate(config)
EOF
# start a replicate set and tell it that it will be a shard2
echo "starting servers for shard 2"
mkdir -p /data/shard2/rs0 /data/shard2/rs1 /data/shard2/rs2
mongod --replSet s2 --logpath "s2-r0.log" --dbpath /data/shard2/rs0 --port 57017 --fork --shardsvr --smallfiles
mongod --replSet s2 --logpath "s2-r1.log" --dbpath /data/shard2/rs1 --port 57018 --fork --shardsvr --smallfiles
mongod --replSet s2 --logpath "s2-r2.log" --dbpath /data/shard2/rs2 --port 57019 --fork --shardsvr --smallfiles
sleep 5
echo "Configuring s2 replica set"
mongo --port 57017 << 'EOF'
config = { _id: "s2", members:[
{ _id : 0, host : "localhost:57017" },
{ _id : 1, host : "localhost:57018" },
{ _id : 2, host : "localhost:57019" }]};
rs.initiate(config)
EOF
# now start 3 config servers
echo "Starting config servers"
mkdir -p /data/config/config-a /data/config/config-b /data/config/config-c
mongod --logpath "cfg-a.log" --dbpath /data/config/config-a --port 57040 --fork --configsvr --smallfiles
mongod --logpath "cfg-b.log" --dbpath /data/config/config-b --port 57041 --fork --configsvr --smallfiles
mongod --logpath "cfg-c.log" --dbpath /data/config/config-c --port 57042 --fork --configsvr --smallfiles
# now start the mongos on a standard port
mongos --logpath "mongos-1.log" --configdb localhost:57040,localhost:57041,localhost:57042 --fork
echo "Waiting 60 seconds for the replica sets to fully come online"
sleep 60
echo "Connnecting to mongos and enabling sharding"
# add shards and enable sharding on the test db
mongo <<'EOF'
db.adminCommand( { addshard : "s0/"+"localhost:37017" } );
db.adminCommand( { addshard : "s1/"+"localhost:47017" } );
db.adminCommand( { addshard : "s2/"+"localhost:57017" } );
db.adminCommand({enableSharding: "school"})
db.adminCommand({shardCollection: "school.students", key: {student_id:1}});
EOF
NOTE:
Newer mongodb versions doesn’t support mirrored config servers. Thus, you need to setup them as an ordinary replSet. To do so, replace lines 71-73 by these:
mongod –replSet cs –logpath “cfg-a.log” –dbpath /data/config/config-a –port 57040 –fork –configsvr –smallfiles
mongod –replSet cs –logpath “cfg-b.log” –dbpath /data/config/config-b –port 57041 –fork –configsvr –smallfiles
mongod –replSet cs –logpath “cfg-c.log” –dbpath /data/config/config-c –port 57042 –fork –configsvr –smallfiles
And add thereafter these lines:
echo “Configuring config servers”
mongo –port 57040 << ‘EOF’
config = { _id: “cs”, members:[
{ _id : 0, host : “localhost:57040” },
{ _id : 1, host : “localhost:57041” },
{ _id : 2, host : “localhost:57042” }]};
rs.initiate(config)
EOF
Finally, replace line 86 by this one:
mongos –logpath “mongos-1.log” –configdb cs/localhost:57040,localhost:57041,localhost:57042 –fork
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