MongoDB 安装（CentOS 6.5 64位）
跟着官方的Doc安装，很简单。 留点笔记以后用。
1. yum 配置文件定义
[root@mongodb ~]# vi /etc/yum.repos.d/mongodb.repo
[mongodb]
name=MongoDB Repository
baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/x86_64/
gpgcheck=0
enabled=1
2. 安装
安装前确认系统没有既存的mongodb，以免版本发生冲突。如果有，应该卸载。
查看mongodb
[root@mongodb ~]# rpm -qa | grep mongodb
mongodb-2.4.6-1.el6.x86_64
卸载mongodb
[root@mongodb ~]# rpm -e mongodb
安装mongodb 根据网速快慢，安装可能需要几分钟。
也可以指定安装版本，默认是最新版本。当前时2.6.1-2
[root@mongodb ~]# sudo yum install mongodb-org
3. 系统设定
以为要设置端口和防火墙，结果没设置好像也没事。....
4. 运行MongoDB
启动
[root@mongodb ~]# sudo service mongod start
Starting mongod: [ OK ]
停止
[root@mongodb ~]# sudo service mongod stop
Stopping mongod: [ OK ]
重启 因为mongodb没有启动，所以停止时出错了。没有影响，忽略就行了。
[root@mongodb ~]# sudo service mongod restart
Stopping mongod: [FAILED]
Starting mongod: [ OK ]
查看当前mongodb是不是启动中
[root@mongodb ~]# ps -ef | grep mongod
mongod 1267 1 0 03:34 ? 00:00:04 /usr/bin/mongod -f /etc/mongod.conf
root 1295 1051 0 03:41 pts/0 00:00:00 grep mongod
通过杀进程，关闭mongodb
[root@mongodb ~]# kill -9 1267
设置开机启动
[root@mongodb ~]# sudo chkconfig mongod on
5. 查看log
log路径：/var/log/mongo
数据路径：/var/lib/mongo
[root@mongodb ~]# tail -f /var/log/mongodb/mongod.log
2014-06-13T03:34:07.266-0400 [initandlisten] build info: Linux build14.nj1.10gen.cc 2.6.32-431.3.1.el6.x86_64 #1 SMP Fri Jan 3 21:39:27 UTC 2014 x86_64 BOOST_LIB_VERSION=1_49
2014-06-13T03:34:07.266-0400 [initandlisten] allocator: tcmalloc
2014-06-13T03:34:07.266-0400 [initandlisten] options: { config: "/etc/mongod.conf", net: { bindIp: "127.0.0.1" }, processManagement: { fork: true, pidFilePath: "/var/run/mongodb/mongod.pid" }, storage: { dbPath: "/var/lib/mongo" }, systemLog: { destination: "file", logAppend: true, path: "/var/log/mongodb/mongod.log" } }
6. 初体验
连接mongodb 系统模拟人的监听端口是27017，host是localhost
[root@mongodb ~]# mongo
MongoDB shell version: 2.6.1
connecting to: test
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查看帮助 命令行的操作不太喜欢，还是选一个好的可视化工具吧。例如：Robomongo
[root@mongodb ~]# mongo
MongoDB shell version: 2.6.1
connecting to: test
> help
db.help() help on db methods
db.mycoll.help() help on collection methods
sh.help() sharding helpers
rs.help() replica set helpers
help admin administrative help
help connect connecting to a db help
help keys key shortcuts
help misc misc things to know
help mr mapreduce
show dbs show database names
show collections show collections in current database
show users show users in current database
show profile show most recent system.profile entries with time >= 1ms
show logs show the accessible logger names
show log [name] prints out the last segment of log in memory, 'global' is default
use <db_name> set current database
db.foo.find() list objects in collection foo
db.foo.find( { a : 1 } ) list objects in foo where a == 1
it result of the last line evaluated; use to further iterate
DBQuery.shellBatchSize = x set default number of items to display on shell
exit quit the mongo shell
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