###修复启动过程中的两个警告，关于使用root用户启动mongo的警告先忽略
# echo "never" > /sys/kernel/mm/transparent_hugepage/enabled
# echo "never" > /sys/kernel/mm/transparent_hugepage/defrag
###再次重启，后置于后台进程，
# mongod --dbpath /data/mongodata &
###查看启动后的进程
# ps -ef|grep mongo |grep -v grep
root 11115 27956 0 10:11 pts/2 00:00:00 mongod --dbpath /data/mongodata
# lsof -i:27017
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
mongod 11115 root 5u IPv4 50567119 0t0 TCP *:27017 (LISTEN)
###使用mongo连接到mongod
# mongo
MongoDB shell version: 3.0.6
connecting to: test
2015-10-28T10:14:30.685+0800 I NETWORK [initandlisten] connection accepted from 127.0.0.1:53907 #1 (1 connection now open)
Server has startup warnings:
2015-10-28T10:11:49.217+0800 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2015-10-28T10:11:49.217+0800 I CONTROL [initandlisten]
> 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
> db.getCollection("version");
test.version
> exit
bye