Mongodb mongo：在没有后端与db对话时获得大量连接

我刚刚创建了一个带有两个实例的mongo复制设置。日志显示每秒开始和结束的大量连接。日志如下。当我没有任何服务器与数据库通信时，你知道为什么会有这么多连接吗？我也不明白为什么连接的端口不断增加

主Mongo实例

$ tail  /log/mongod.log
2015-02-08T21:46:40.679+0000 [initandlisten] connection accepted from <local machine private IP from EC2>:43833 #58 (6 connections now open)
2015-02-08T21:46:40.680+0000 [conn58]  authenticate db: local { authenticate: 1, nonce: "xxx", user: "__system", key: "xxx" }
2015-02-08T21:47:05.416+0000 [conn10] end connection <local machine private IP from EC2>:43719 (5 connections now open)
2015-02-08T21:47:05.416+0000 [conn13] end connection <local machine private IP from EC2>:43724 (4 connections now open)
2015-02-08T21:47:10.699+0000 [conn58] end connection <local machine private IP from EC2>:43833 (3 connections now open)
2015-02-08T21:47:10.700+0000 [initandlisten] connection accepted from <local machine private IP from EC2>:43835 #59 (4 connections now open)
2015-02-08T21:47:10.702+0000 [conn59]  authenticate db: local { authenticate: 1, nonce: "xxx", user: "__system", key: "xxx" }
2015-02-08T21:47:40.720+0000 [conn59] end connection <local machine private IP from EC2>:43835 (3 connections now open)
2015-02-08T21:47:40.723+0000 [initandlisten] connection accepted from <local machine private IP from EC2>:43836 #60 (4 connections now open)
2015-02-08T21:47:40.724+0000 [conn60]  authenticate db: local { authenticate: 1, nonce: "xxx", user: "__system", key: "xxx" }

$tail/log/mongod.log
2015-02-08T21:46:40.679+0000[initandlisten]连接已接受自：43833#58（6个连接现已打开）
2015-02-08T21:46:40.680+0000[conn58]身份验证数据库：本地{身份验证：1，nonce:“xxx”，用户：“\uu系统”，密钥：“xxx”}
2015-02-08T21:47:05.416+0000[conn10]端部连接：43719（5个连接现在打开）
2015-02-08T21:47:05.416+0000[conn13]端部连接：43724（4个连接现在打开）
2015-02-08T21:47:10.699+0000[conn58]端部连接：43833（3个连接现在打开）
2015-02-08T21:47:10.700+0000[initandlisten]连接已接受自：43835#59（4个连接现已打开）
2015-02-08T21:47:10.702+0000[conn59]authenticate db:local{authenticate:1，nonce:“xxx”，user:“\uu system”，key:“xxx”}
2015-02-08T21:47:40.720+0000[conn59]端部连接：43835（3个连接现在打开）
2015-02-08T21:47:40.723+0000[initandlisten]连接已接受自：43836#60（4个连接现已打开）
2015-02-08T21:47:40.724+0000[conn60]authenticate db:local{authenticate:1，nonce:“xxx”，user:“\uu系统”，key:“xxx”}

辅助Mongo实例

$ tail /log/mongod.log 
2015-02-08T21:46:39.732+0000 [conn285]  authenticate db: local { authenticate: 1, nonce: "xxx", user: "__system", key: "xxx" }
2015-02-08T21:46:59.877+0000 [initandlisten] connection accepted from <local machine elastic IP from EC2>:42568 #286 (4 connections now open)
2015-02-08T21:46:59.881+0000 [conn286] end connection <local machine elastic IP from EC2>:42568 (3 connections now open)
2015-02-08T21:47:05.424+0000 [conn191] end connection <local machine private IP from EC2>:44756 (2 connections now open)
2015-02-08T21:47:09.750+0000 [conn285] end connection <local machine private IP from EC2>:43873 (1 connection now open)
2015-02-08T21:47:09.752+0000 [initandlisten] connection accepted from <local machine private IP from EC2>:43874 #287 (2 connections now open)
2015-02-08T21:47:09.753+0000 [conn287]  authenticate db: local { authenticate: 1, nonce: "xxx", user: "__system", key: "xxx" }
2015-02-08T21:47:39.772+0000 [conn287] end connection <local machine private IP from EC2>:43874 (1 connection now open)
2015-02-08T21:47:39.774+0000 [initandlisten] connection accepted from <local machine private IP from EC2>:43875 #288 (2 connections now open)
2015-02-08T21:47:39.775+0000 [conn288]  authenticate db: local { authenticate: 1, nonce: "xxx", user: "__system", key: "xxx" }

$tail/log/mongod.log
2015-02-08T21:46:39.732+0000[conn285]authenticate db:local{authenticate:1，nonce:“xxx”，user:“\uu系统”，key:“xxx”}
2015-02-08T21:46:59.877+0000[initandlisten]连接已接受自：42568#286（4个连接现已打开）
2015-02-08T21:46:59.881+0000[conn286]端部连接：42568（3个连接现在打开）
2015-02-08T21:47:05.424+0000[conn191]端部连接：44756（2个连接现在打开）
2015-02-08T21:47:09.750+0000[conn285]端部连接：43873（1个连接现在打开）
2015-02-08T21:47:09.752+0000[initandlisten]连接已接受自：43874#287（2个连接现已打开）
2015-02-08T21:47:09.753+0000[conn287]authenticate db:local{authenticate:1，nonce:“xxx”，user:“\uu系统”，key:“xxx”}
2015-02-08T21:47:39.772+0000[conn287]端部连接：43874（1个连接现在打开）
2015-02-08T21:47:39.774+0000[initandlisten]连接已接受自：43875#288（2个连接现已打开）
2015-02-08T21:47:39.775+0000[conn288]authenticate db:local{authenticate:1，nonce:“xxx”，user:“\uu系统”，key:“xxx”}

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我也有点困惑为什么在某些情况下会使用弹性IP（参见第二个日志）。我假设使用公共IP会导致AWS向我收费？

每隔30秒出现的连接是心跳线程，来自另一个副本集成员，以确保该成员仍然处于活动状态和健康状态。它们使用复制集配置中的任何IP

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使用公共IP的连接似乎很快结束了连接。打开日志级别并了解它在做什么？

副本集中只有2个成员？不建议这样做。是否有任何方法可以减少日志垃圾邮件？我想每分钟只有两次日志。