一、添加yum源

vi /etc/yum.repos.d/mongodb-org-3.0.repo

请添加如下配置（64位系统）：

[mongodb-org-3.0]

name=MongoDB Repository

baseurl=http://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.0/x86_64/

gpgcheck=0

enabled=1

二、安装MongoDB

sudo yum install -y mongodb-org

三、修改soft rlimits的限制

 vi /etc/security/limits.conf

在文件最后加上

mongod soft nproc 65536

mongod hard nproc 65536

如果不做第三步，启动mongodb后会出现下面的提示

2015-05-21T14:58:52.493+0800 I CONTROL  [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 1024 processes, 65536 files. Number of processes should be at least 32768 : 0.5 times number of files.

四、配置MongoDB（使用wiredTiger引擎）

vi /etc/mongod.conf

根据下面的配置修改/etc/mongod.conf里的配置

# mongod.conf

#where to log

logpath=/var/log/mongodb/mongod.log

logappend=true

# fork and run in background

fork=true

#port=27017

dbpath=/var/lib/mongo

# location of pidfile

pidfilepath=/var/run/mongodb/mongod.pid

# Listen to local interface only. Comment out to listen on all interfaces.

#bind_ip=192.168.0.31

# Disables write-ahead journaling

nojournal=true

# Enables periodic logging of CPU utilization and I/O wait

#cpu=true

# Turn on/off security.  Off is currently the default

#noauth=true

#auth=true

# Verbose logging output.

#verbose=true

# Inspect all client data for validity on receipt (useful for

# developing drivers)

#objcheck=true

# Enable db quota management

#quota=true

# Set oplogging level where n is

#   0=off (default)

#   1=W

#   2=R

#   3=both

#   7=W+some reads

#diaglog=0

# Ignore query hints

#nohints=true

# Enable the HTTP interface (Defaults to port 28017).

#httpinterface=true

# Turns off server-side scripting.  This will result in greatly limited

# functionality

#noscripting=true

# Turns off table scans.  Any query that would do a table scan fails.

#notablescan=true

# Disable data file preallocation.

#noprealloc=true

# Specify .ns file size for new databases.

# nssize=<size>

storageEngine=wiredTiger

wiredTigerCacheSizeGB=10

wiredTigerStatisticsLogDelaySecs=0

wiredTigerJournalCompressor=snappy

wiredTigerDirectoryForIndexes=true

wiredTigerCollectionBlockCompressor=snappy

wiredTigerIndexPrefixCompression=1

# Replication Options

# in replicated mongo databases, specify the replica set name here

#replSet=yourrs

# maximum size in megabytes for replication operation log

oplogSize=10240

# path to a key file storing authentication info for connections

# between replica set members

#keyFile=/path/to/keyfile

五、启动MongoDB

/etc/init.d/mongod start

六、创建管理员账号

进入mongo

mongo

在mongo shell里面输入

use admin

进入admin库之后，输入

db.createUser({user: "admin",pwd: "admin",roles: [ "dbAdmin" ]})

这样就创建了一个用户名是admin，密码是admin的管理员角色的用户。

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