You could configure sharding because 2Gb limit only applies to individual mongodb processes. Pls refer the documentation sharded-clusters,and I also found Python Script to set-up sharded environment on a single machine.
#!/usr/bin/python2
import os
import sys
import shutil
import pymongo
import atexit
from socket import error, socket, AF_INET, SOCK_STREAM
from select import select
from subprocess import Popen, PIPE, STDOUT
from threading import Thread
from time import sleep
try:
# new pymongo
from bson.son import SON
except ImportError:
# old pymongo
from pymongo.son import SON
# BEGIN CONFIGURATION
# some settings can also be set on command line. start with --help to see options
BASE_DATA_PATH='/data/db/sharding/' #warning: gets wiped every time you run this
MONGO_PATH=os.getenv( "MONGO_HOME" , os.path.expanduser('~/10gen/mongo/') )
N_SHARDS=3
N_CONFIG=1 # must be either 1 or 3
N_MONGOS=1
CHUNK_SIZE=64 # in MB (make small to test splitting)
MONGOS_PORT=27017 if N_MONGOS == 1 else 10000 # start at 10001 when multi
USE_SSL=False # set to True if running with SSL enabled
CONFIG_ARGS=[]
MONGOS_ARGS=[]
MONGOD_ARGS=[]
# Note this reports a lot of false positives.
USE_VALGRIND=False
VALGRIND_ARGS=["valgrind", "--log-file=/tmp/mongos-%p.valgrind", "--leak-check=yes",
("--suppressions="+MONGO_PATH+"valgrind.suppressions"), "--"]
# see http://pueblo.sourceforge.net/doc/manual/ansi_color_codes.html
CONFIG_COLOR=31 #red
MONGOS_COLOR=32 #green
MONGOD_COLOR=36 #cyan
BOLD=True
# defaults -- can change on command line
COLLECTION_KEYS = {'foo' : '_id', 'bar': 'key', 'foo2' : 'a,b' }
def AFTER_SETUP():
# feel free to change any of this
# admin and conn are both defined globaly
admin.command('enablesharding', 'test')
for (collection, keystr) in COLLECTION_KEYS.iteritems():
key=SON((k,1) for k in keystr.split(','))
admin.command('shardcollection', 'test.'+collection, key=key)
admin.command('shardcollection', 'test.fs.files', key={'_id':1})
admin.command('shardcollection', 'test.fs.chunks', key={'files_id':1})
# END CONFIGURATION
for x in sys.argv[1:]:
opt = x.split("=", 1)
if opt[0] != '--help' and len(opt) != 2:
raise Exception("bad arg: " + x )
if opt[0].startswith('--'):
opt[0] = opt[0][2:].lower()
if opt[0] == 'help':
print sys.argv[0], '[--help] [--chunksize=200] [--port=27017] [--path=/where/is/mongod] [collection=key]'
sys.exit()
elif opt[0] == 'chunksize':
CHUNK_SIZE = int(opt[1])
elif opt[0] == 'port':
MONGOS_PORT = int(opt[1])
elif opt[0] == 'path':
MONGO_PATH = opt[1]
elif opt[0] == 'usevalgrind': #intentionally not in --help
USE_VALGRIND = int(opt[1])
else:
raise( Exception("unknown option: " + opt[0] ) )
else:
COLLECTION_KEYS[opt[0]] = opt[1]
if MONGO_PATH[-1] != '/':
MONGO_PATH = MONGO_PATH+'/'
print( "MONGO_PATH: " + MONGO_PATH )
if not USE_VALGRIND:
VALGRIND_ARGS = []
# fixed "colors"
RESET = 0
INVERSE = 7
if os.path.exists(BASE_DATA_PATH):
print( "removing tree: %s" % BASE_DATA_PATH )
shutil.rmtree(BASE_DATA_PATH)
mongod = MONGO_PATH + 'mongod'
mongos = MONGO_PATH + 'mongos'
devnull = open('/dev/null', 'w+')
fds = {}
procs = []
def killAllSubs():
for proc in procs:
try:
proc.terminate()
except OSError:
pass #already dead
atexit.register(killAllSubs)
def mkcolor(colorcode):
base = '\x1b[%sm'
if BOLD:
return (base*2) % (1, colorcode)
else:
return base % colorcode
def ascolor(color, text):
return mkcolor(color) + text + mkcolor(RESET)
def waitfor(proc, port):
trys = 0
while proc.poll() is None and trys < 40: # ~10 seconds
trys += 1
s = socket(AF_INET, SOCK_STREAM)
try:
try:
s.connect(('localhost', port))
return
except (IOError, error):
sleep(0.25)
finally:
s.close()
#extra prints to make line stand out
print
print proc.prefix, ascolor(INVERSE, 'failed to start')
print
sleep(1)
killAllSubs()
sys.exit(1)
def printer():
while not fds: sleep(0.01) # wait until there is at least one fd to watch
while fds:
(files, _ , errors) = select(fds.keys(), [], fds.keys(), 1)
for file in set(files + errors):
# try to print related lines together
while select([file], [], [], 0)[0]:
line = file.readline().rstrip()
if line:
print fds[file].prefix, line
else:
if fds[file].poll() is not None:
print fds[file].prefix, ascolor(INVERSE, 'EXITED'), fds[file].returncode
del fds[file]
break
break
printer_thread = Thread(target=printer)
printer_thread.start()
configs = []
for i in range(1, N_CONFIG+1):
path = BASE_DATA_PATH +'config_' + str(i)
os.makedirs(path)
config = Popen([mongod, '--port', str(20000 + i), '--configsvr', '--dbpath', path] + CONFIG_ARGS,
stdin=devnull, stdout=PIPE, stderr=STDOUT)
config.prefix = ascolor(CONFIG_COLOR, 'C' + str(i)) + ':'
fds[config.stdout] = config
procs.append(config)
waitfor(config, 20000 + i)
configs.append('localhost:' + str(20000 + i))
for i in range(1, N_SHARDS+1):
path = BASE_DATA_PATH +'shard_' + str(i)
os.makedirs(path)
shard = Popen([mongod, '--port', str(30000 + i), '--shardsvr', '--dbpath', path] + MONGOD_ARGS,
stdin=devnull, stdout=PIPE, stderr=STDOUT)
shard.prefix = ascolor(MONGOD_COLOR, 'M' + str(i)) + ':'
fds[shard.stdout] = shard
procs.append(shard)
waitfor(shard, 30000 + i)
#this must be done before starting mongos
for config_str in configs:
host, port = config_str.split(':')
config = pymongo.Connection(host, int(port), ssl=USE_SSL).config
config.settings.save({'_id':'chunksize', 'value':CHUNK_SIZE}, safe=True)
del config #don't leave around connection directly to config server
if N_MONGOS == 1:
MONGOS_PORT -= 1 # added back in loop
for i in range(1, N_MONGOS+1):
router = Popen(VALGRIND_ARGS + [mongos, '--port', str(MONGOS_PORT+i), '--configdb' , ','.join(configs)] + MONGOS_ARGS,
stdin=devnull, stdout=PIPE, stderr=STDOUT)
router.prefix = ascolor(MONGOS_COLOR, 'S' + str(i)) + ':'
fds[router.stdout] = router
procs.append(router)
waitfor(router, MONGOS_PORT + i)
conn = pymongo.Connection('localhost', MONGOS_PORT + 1, ssl=USE_SSL)
admin = conn.admin
for i in range(1, N_SHARDS+1):
admin.command('addshard', 'localhost:3000'+str(i), allowLocal=True)
AFTER_SETUP()
# just to be safe
sleep(2)
print '*** READY ***'
print
print
try:
printer_thread.join()
except KeyboardInterrupt:
pass
