监控账号：mongos 连进去, mongos 和shard要有创建

db.createUser({

user:"user_monitor ",

pwd:"password",

roles:[{"db": "admin", "role": "clusterMonitor"},{"db": "admin", "role": "read"}]

})

备份账号：

mongos 连进去, mongos 和shard都要创建

db.createUser({

user:"user_backup",

pwd:"password",

roles:[{role:”backup”,db:”admin”}]

})

--创建业务账号，mongos和mongod都连进去创建

db.createUser({user:"username",pwd:"password",roles:[{role:"readWrite",db:"db_name"}]})

####mongo库日志归档###   pid 是mongod对应进程号

kill -SIGUSR1 pid