mongodb复制没有在EC2上运行

我在EC2上设置了mongodb的主/从复制 . 但我发现不会发生复制 . 当我在master上显示“显示dbs”时，它会显示所有预期的dbs .

但是当我在副本上做同样的事情时，它并没有向我显示任何数据库 .

请帮我排除故障 .

在ubuntu 12.04 ec2实例上

dpkg -l | grep mongo
ii  mongodb-10gen                    2.4.5                        An object/document-oriented database

rs.config()
{
    "_id" : "ittw",
    "version" : 1,
    "members" : [
        {
            "_id" : 0,
            "host" : "ip-10-304-48-93:27017"
        }
    ]
}

rs.config()
{
    "_id" : "ittw",
    "version" : 2,
    "members" : [
        {
            "_id" : 0,
            "host" : "domU-17-31-19-16-88-5F:27017"
        },
        {
            "_id" : 1,
            "host" : "ec2-50-321-52-908.compute-1.amazonaws.com:27017"
        }
    ]
}
rs.status() // replica
{
    "set" : "ittw",
    "date" : ISODate("2013-08-12T06:55:57Z"),
    "myState" : 1,
    "members" : [
        {
            "_id" : 0,
            "name" : "$ip:27017",
            "health" : 1,
            "state" : 1,
            "stateStr" : "PRIMARY",
            "uptime" : 356039,
            "optime" : Timestamp(1375934685, 1),
            "optimeDate" : ISODate("2013-08-08T04:04:45Z"),
            "self" : true
        }
    ],
    "ok" : 1
}



rs.status()  //Master
{
    "set" : "ittw",
    "date" : ISODate("2013-08-12T06:57:19Z"),
    "myState" : 1,
    "members" : [
        {
            "_id" : 0,
            "name" : "PRI_IP:27017",
            "health" : 1,
            "state" : 1,
            "stateStr" : "PRIMARY",
            "uptime" : 356543,
            "optime" : Timestamp(1376289725, 1),
            "optimeDate" : ISODate("2013-08-12T06:42:05Z"),
            "self" : true
        },
        {
            "_id" : 1,
            "name" : "REP_IP:27017",
            "health" : 1,
            "state" : 1,
            "stateStr" : "PRIMARY",
            "uptime" : 355869,
            "optime" : Timestamp(1375934685, 1),
            "optimeDate" : ISODate("2013-08-08T04:04:45Z"),
            "lastHeartbeat" : ISODate("2013-08-12T06:57:17Z"),
            "lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),
            "pingMs" : 1
        }
    ],
    "ok" : 1
}

我在REPLIC日志中看到以下几行：

Mon Aug 12 07:29:53.889 [initandlisten] connection accepted from $PRIMARY_IP:51376 #11921 (1 connection now open)
Mon Aug 12 07:30:23.922 [conn11921] end connection $PRIMARY_IP:51376 (0 connections now open)
Mon Aug 12 07:30:23.925 [initandlisten] connection accepted from $PRIMARY_IP:51377 #11922 (1 connection now open) 
Mon Aug 12 07:30:53.958 [conn11922] end connection $PRIMARY_IP:51377 (0 connections now open)

编辑：执行rs.initiate（）和rs.add（）后

rs.status()
{
    "set" : "ittw",
    "date" : ISODate("2013-08-12T18:25:20Z"),
    "myState" : 1,
    "members" : [
        {
            "_id" : 0,
            "name" : "PRIMARY_IP:27017",
            "health" : 1,
            "state" : 1,
            "stateStr" : "PRIMARY",
            "uptime" : 1225,
            "optime" : Timestamp(1376331887, 1),
            "optimeDate" : ISODate("2013-08-12T18:24:47Z"),
            "self" : true
        },
        {
            "_id" : 1,
            "name" : "SECONDARY_IP:27017",
            "health" : 1,
            "state" : 2,
            "stateStr" : "SECONDARY",
            "uptime" : 33,
            "optime" : Timestamp(1376331887, 1),
            "optimeDate" : ISODate("2013-08-12T18:24:47Z"),
            "lastHeartbeat" : ISODate("2013-08-12T18:25:20Z"),
            "lastHeartbeatRecv" : ISODate("2013-08-12T18:25:20Z"),
            "pingMs" : 10,
            "syncingTo" : "ip-10-190-185-227:27017"
        }
    ],
    "ok" : 1
}