今天刚配了一个mongodb主从，配置如下：

master：

/usr/local/mongodb/bin/mongod –fork –port 40000 –dbpath /u01/mongodata/db/geomaster/ –logpath /u01/mongodata/log/geomaster.log –logappend –master –auth

slave：

/usr/local/mongodb/bin/mongod –fork –port 40000 –slave –source 1.1.1.1:40000 –dbpath /u01/mongodata/db/geoslave/ –logpath /u01/mongodata/log/geosalve.log –logappend –auth
然后我在master上更新了一下admin的密码，但是slave没有同步过去。操作如下：
/usr/local/mongodb/bin/mongo –port 40000 admin -u admin -p

MongoDB shell version: 2.2.0

Enter password:

connecting to: 127.0.0.1:40000/admin

> use admin

switched to db admin

> show users

{

“_id” : ObjectId(“50f60fe6179b01ee8f3e6c60”),

“user” : “admin”,

“readOnly” : false,

“pwd” : “859ab375317685a04d8d8ecf80222350”

}

> db.system.users.remove({user:’admin’})

> show users

> db.addUser(‘admin’,’new-password’)

{

“user” : “admin”,

“readOnly” : false,

“pwd” : “2f8ecfc89f3153c9203c189eadb7fa45”,

“_id” : ObjectId(“50f61888c26232c510edae56”)

}

> db.auth(‘admin’,’jiayuan.com2013!@#’)

1
在slave上查看mongodb日志，发现有如下报错信息：
repl:

Wed Jan 16 11:24:51 [replslave] repl: sleep 3 sec before next pass

Wed Jan 16 11:24:54 [replslave] repl: syncing from host:10.1.2.87:40000

Wed Jan 16 11:24:54 [replslave] replauthenticate: no user in local.system.users to use for authentication

repl:

Wed Jan 16 11:24:54 [replslave] repl: sleep 3 sec before next pass

Wed Jan 16 11:24:57 [replslave] repl: syncing from host:10.1.2.87:40000

Wed Jan 16 11:24:57 [replslave] replauthenticate: no user in local.system.users to use for authentication

repl:

Wed Jan 16 11:24:57 [replslave] repl: sleep 3 sec before next pass

Wed Jan 16 11:25:00 [replslave] repl: syncing from host:10.1.2.87:40000

Wed Jan 16 11:25:00 [replslave] replauthenticate: no user in local.system.users to use for authentication

repl:

Wed Jan 16 11:25:00 [replslave] repl: sleep 3 sec before next pass

Wed Jan 16 11:25:03 [replslave] repl: syncing from host:10.1.2.87:40000

Wed Jan 16 11:25:03 [replslave] replauthenticate: no user in local.system.users to use for authentication
这是因为：如果我们要启用Master/Slave模式，而且开启了Auth功能，则需要同时在Master和Slave上的local数据库上增加一个repl的用户。

配置如下：

use local

db.addUser(‘repl’,’replication’)
添加完用户之后，主从同步就正常了。