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db.createUser({user:"admin",pwd:"11",roles:[ "readWrite","dbAdmin"  ]})
db.createUser({user:"root",pwd:"111",roles:["root","clusterAdmin","readAnyDatabase","readWriteAnyDatabase","userAdminAnyDatabase","dbAdminAnyDatabase"]})


db.updateUser("admin",{roles:[ "readWrite","dbAdmin"  ]})
db.updateUser("root",{roles:["root","clusterAdmin","readAnyDatabase","readWriteAnyDatabase","userAdminAnyDatabase","dbAdminAnyDatabase"]})


db.changeUserPassword("user","pwd")

#install 
https://docs.mongodb.com/manual/tutorial/install-mongodb-on-red-hat/

if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
   echo "never" > /sys/kernel/mm/transparent_hugepage/enabled
fi
if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
   echo "never" > /sys/kernel/mm/transparent_hugepage/defrag
fi





systemctl restart mongod.service

默认数据位置
/var/lib/mongo 

默认日志位置
/var/log/mongodb

配置文件位置
/etc/mongod.conf

mongo 

show dbs;

use admin

db.auth('dba','dba')


https://blog.csdn.net/u011191463/article/details/68485529
http://forum.foxera.com/mongodb/topic/273/%E5%B8%90%E5%8F%B7%E7%AE%A1%E7%90%86?un=jerry