设置隐藏节点和不可投票节点

配置隐藏节点

复制集中隐藏节点不能变成主，但是可以参加选举。

隐藏节点，最常用的场景是延迟复制。如果不想某个节点变成主节点，将priority设置成0即可

如果设置了settings.chainingAllowed，支持辅助节点从另外的复制节点做数据同步，mongodb默认是优先讯在非隐藏节点来做数据同步。如果想让辅助节点从隐藏节点同步数据，就要设置replSetSyncFrom做相应的修改。

设置隐藏节点，要将members[n].priority设置为0；members[n].hidden设置成true：

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{   "_id" : <num>   "host" : <hostname:port>,   "priority" : 0,   "hidden" : true }

配置过程：

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cfg = rs.conf() cfg.members[0].priority = 0 cfg.members[0].hidden = true rs.reconfig(cfg)

members的数组下表是从0开始，不要与members[n]._id混淆了。

如果是新加成员

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1	rs.add( { host: "192.168.137.11:27017", priority: 0, hidden: true } )

 

配置非不可投票节点

设置不可投票节点，要将members[n].priority设置为0；members[n].votes设置为0

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cfg = rs.conf(); cfg.members[n].votes = 0; cfg.members[n].priority = 0; rs.reconfig(cfg);

如果是新加成员

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1	rs.add( { host: "192.168.137.11:27017", priority: 0, votes: 0 } )

其它：

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> cfg=rs.conf() {         "_id" : "lq_mongo_rs",         "version" : 1,         "term" : 9,         "members" : [                 {                         "_id" : 0,                         "host" : "192.168.137.54:27017",                         "arbiterOnly" : false,                         "buildIndexes" : true,                         "hidden" : false,                         "priority" : 1,                         "tags" : {                           },                         "secondaryDelaySecs" : NumberLong(0),                         "votes" : 1                 },                 {                         "_id" : 1,                         "host" : "192.168.137.55:27017",                         "arbiterOnly" : false,                         "buildIndexes" : true,                         "hidden" : false,                         "priority" : 1,                         "tags" : {                           },                         "secondaryDelaySecs" : NumberLong(0),                         "votes" : 1                 },                 {                         "_id" : 2,                         "host" : "192.168.137.56:27017",                         "arbiterOnly" : false,                         "buildIndexes" : true,                         "hidden" : false,                         "priority" : 1,                         "tags" : {                           },                         "secondaryDelaySecs" : NumberLong(0),                         "votes" : 1                 }         ],         "protocolVersion" : NumberLong(1),         "writeConcernMajorityJournalDefault" : true,         "settings" : {                 "chainingAllowed" : true,                 "heartbeatIntervalMillis" : 2000,                 "heartbeatTimeoutSecs" : 10,                 "electionTimeoutMillis" : 10000,                 "catchUpTimeoutMillis" : -1,                 "catchUpTakeoverDelayMillis" : 30000,                 "getLastErrorModes" : {                   },                 "getLastErrorDefaults" : {                         "w" : 1,                         "wtimeout" : 0                 },                 "replicaSetId" : ObjectId("63103236dd0aac4d38f820c0")         } }