Mongodb增加、移除Arbiter节点实例

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增加Arbiter

增加配置文件mongod1,mongod2,mongod3分别为shard1，shard2，shard3三个set集合的arbiter。

启动mongod实例。
连接Primary.

移除Arbiter

注意:最好移除结点时候先停掉服务，防止有特殊未知状态出现。

Note:Before running the rs.remove() operation, you must shut down the replica set member that you're removing.
Changed in version 2.2: This procedure is no longer required when using rs.remove(), but it remains good practice.

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