MongoDB副本集replica set（四）--成员配置

对于members[n]的定义：
n是members数组中的数组位置，数组以0开始，千万不能将其理解为“members[n]._id”的_id值。下面的成员配置都是这样理解。

例如，我要调整“192.168.10.43”的节点的优先级为2，因为该节点在数组索引的第1位(从0开始计算)，故调整优先级的方法为：

STEP1：调整前，确认192.168.10.43节点在members数组中的位置：

rstest:PRIMARY><span style="color: #000000;"> rs.config()
{
</span><span style="color: #800000;">"</span><span style="color: #800000;">_id</span><span style="color: #800000;">"</span> : <span style="color: #800000;">"</span><span style="color: #800000;">rstest</span><span style="color: #800000;">"</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">version</span><span style="color: #800000;">"</span> : <span style="color: #800080;">11</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">protocolVersion</span><span style="color: #800000;">"</span> : NumberLong(<span style="color: #800080;">1</span><span style="color: #000000;">),
</span><span style="color: #800000;">"</span><span style="color: #800000;">writeConcernMajorityJournalDefault</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">true</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">members</span><span style="color: #800000;">"</span><span style="color: #000000;"> : [
{
</span><span style="color: #800000;">"</span><span style="color: #800000;">_id</span><span style="color: #800000;">"</span> : <span style="color: #800080;">0</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">host</span><span style="color: #800000;">"</span> : <span style="color: #800000;">"</span><span style="color: #800000;">192.168.10.41:27017</span><span style="color: #800000;">"</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">arbiterOnly</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">buildIndexes</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">true</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">hidden</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">priority</span><span style="color: #800000;">"</span> : <span style="color: #800080;">3</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">tags</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
},
</span><span style="color: #800000;">"</span><span style="color: #800000;">slaveDelay</span><span style="color: #800000;">"</span> : NumberLong(<span style="color: #800080;">0</span><span style="color: #000000;">),
</span><span style="color: #800000;">"</span><span style="color: #800000;">votes</span><span style="color: #800000;">"</span> : <span style="color: #800080;">1</span><span style="color: #000000;">
},
{
</span><span style="color: #800000;">"</span><span style="color: #800000;">_id</span><span style="color: #800000;">"</span> : <span style="color: #800080;">2</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">host</span><span style="color: #800000;">"</span> : <span style="color: #800000;">"</span><span style="color: #800000;">192.168.10.43:27017</span><span style="color: #800000;">"</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">arbiterOnly</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">buildIndexes</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">true</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">hidden</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">priority</span><span style="color: #800000;">"</span> : <span style="color: #800080;">0</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">tags</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
},
</span><span style="color: #800000;">"</span><span style="color: #800000;">slaveDelay</span><span style="color: #800000;">"</span> : NumberLong(<span style="color: #800080;">0</span><span style="color: #000000;">),
</span><span style="color: #800000;">"</span><span style="color: #800000;">votes</span><span style="color: #800000;">"</span> : <span style="color: #800080;">1</span><span style="color: #000000;">
},
{
</span><span style="color: #800000;">"</span><span style="color: #800000;">_id</span><span style="color: #800000;">"</span> : <span style="color: #800080;">3</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">host</span><span style="color: #800000;">"</span> : <span style="color: #800000;">"</span><span style="color: #800000;">192.168.10.42:27017</span><span style="color: #800000;">"</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">arbiterOnly</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">buildIndexes</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">true</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">hidden</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">priority</span><span style="color: #800000;">"</span> : <span style="color: #800080;">2</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">tags</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
},
</span><span style="color: #800000;">"</span><span style="color: #800000;">slaveDelay</span><span style="color: #800000;">"</span> : NumberLong(<span style="color: #800080;">0</span><span style="color: #000000;">),
</span><span style="color: #800000;">"</span><span style="color: #800000;">votes</span><span style="color: #800000;">"</span> : <span style="color: #800080;">1</span><span style="color: #000000;">
}
],
</span><span style="color: #800000;">"</span><span style="color: #800000;">settings</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
</span><span style="color: #800000;">"</span><span style="color: #800000;">chainingAllowed</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">true</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">heartbeatIntervalMillis</span><span style="color: #800000;">"</span> : <span style="color: #800080;">2000</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">heartbeatTimeoutSecs</span><span style="color: #800000;">"</span> : <span style="color: #800080;">10</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">electionTimeoutMillis</span><span style="color: #800000;">"</span> : <span style="color: #800080;">10000</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">catchUpTimeoutMillis</span><span style="color: #800000;">"</span> : -<span style="color: #800080;">1</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">catchUpTakeoverDelayMillis</span><span style="color: #800000;">"</span> : <span style="color: #800080;">30000</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">getLastErrorModes</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
},
</span><span style="color: #800000;">"</span><span style="color: #800000;">getLastErrorDefaults</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
</span><span style="color: #800000;">"</span><span style="color: #800000;">w</span><span style="color: #800000;">"</span> : <span style="color: #800080;">1</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">wtimeout</span><span style="color: #800000;">"</span> : <span style="color: #800080;">0</span><span style="color: #000000;">
},
</span><span style="color: #800000;">"</span><span style="color: #800000;">replicaSetId</span><span style="color: #800000;">"</span> : ObjectId(<span style="color: #800000;">"</span><span style="color: #800000;">5ef1b03c01bba8d9a6759c18</span><span style="color: #800000;">"</span><span style="color: #000000;">)
}
}
rstest:PRIMARY</span>>

STEP2：从上面可以看到，“192.168.10.43”位于数组的第1位，前面的“192.168.10.41”是第0个成员，调整优先级：

rstest:PRIMARY> cfg =<span style="color: #000000;"> rs.conf()
rstest:PRIMARY</span>> cfg.members[<span style="color: #800080;">1</span>].priority = <span style="color: #800080;">2</span>
<span style="color: #800080;">2</span><span style="color: #000000;">
rstest:PRIMARY</span>><span style="color: #000000;"> rs.reconfig(cfg)
{
</span><span style="color: #800000;">"</span><span style="color: #800000;">ok</span><span style="color: #800000;">"</span> : <span style="color: #800080;">1</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">$clusterTime</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
</span><span style="color: #800000;">"</span><span style="color: #800000;">clusterTime</span><span style="color: #800000;">"</span> : Timestamp(<span style="color: #800080;">1593364371</span>, <span style="color: #800080;">1</span><span style="color: #000000;">),
</span><span style="color: #800000;">"</span><span style="color: #800000;">signature</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
</span><span style="color: #800000;">"</span><span style="color: #800000;">hash</span><span style="color: #800000;">"</span> : BinData(<span style="color: #800080;">0</span>,<span style="color: #800000;">"</span><span style="color: #800000;">gU7HNe/7TCGjsdRB3bU8EWb4SSs=</span><span style="color: #800000;">"</span><span style="color: #000000;">),
</span><span style="color: #800000;">"</span><span style="color: #800000;">keyId</span><span style="color: #800000;">"</span> : NumberLong(<span style="color: #800000;">"</span><span style="color: #800000;">6841443127941660675</span><span style="color: #800000;">"</span><span style="color: #000000;">)
}
},
</span><span style="color: #800000;">"</span><span style="color: #800000;">operationTime</span><span style="color: #800000;">"</span> : Timestamp(<span style="color: #800080;">1593364371</span>, <span style="color: #800080;">1</span><span style="color: #000000;">)
}
rstest:PRIMARY</span>>

 STEP3：调整后，发现“192.168.10.43”节点优先级由0变为了2：

rstest:PRIMARY><span style="color: #000000;"> rs.conf()
{
</span><span style="color: #800000;">"</span><span style="color: #800000;">_id</span><span style="color: #800000;">"</span> : <span style="color: #800000;">"</span><span style="color: #800000;">rstest</span><span style="color: #800000;">"</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">version</span><span style="color: #800000;">"</span> : <span style="color: #800080;">12</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">protocolVersion</span><span style="color: #800000;">"</span> : NumberLong(<span style="color: #800080;">1</span><span style="color: #000000;">),
</span><span style="color: #800000;">"</span><span style="color: #800000;">writeConcernMajorityJournalDefault</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">true</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">members</span><span style="color: #800000;">"</span><span style="color: #000000;"> : [
{
</span><span style="color: #800000;">"</span><span style="color: #800000;">_id</span><span style="color: #800000;">"</span> : <span style="color: #800080;">0</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">host</span><span style="color: #800000;">"</span> : <span style="color: #800000;">"</span><span style="color: #800000;">192.168.10.41:27017</span><span style="color: #800000;">"</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">arbiterOnly</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">buildIndexes</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">true</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">hidden</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">priority</span><span style="color: #800000;">"</span> : <span style="color: #800080;">3</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">tags</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
},
</span><span style="color: #800000;">"</span><span style="color: #800000;">slaveDelay</span><span style="color: #800000;">"</span> : NumberLong(<span style="color: #800080;">0</span><span style="color: #000000;">),
</span><span style="color: #800000;">"</span><span style="color: #800000;">votes</span><span style="color: #800000;">"</span> : <span style="color: #800080;">1</span><span style="color: #000000;">
},
{
</span><span style="color: #800000;">"</span><span style="color: #800000;">_id</span><span style="color: #800000;">"</span> : <span style="color: #800080;">2</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">host</span><span style="color: #800000;">"</span> : <span style="color: #800000;">"</span><span style="color: #800000;">192.168.10.43:27017</span><span style="color: #800000;">"</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">arbiterOnly</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">buildIndexes</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">true</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">hidden</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">priority</span><span style="color: #800000;">"</span> : <span style="color: #800080;">2</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">tags</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
},
</span><span style="color: #800000;">"</span><span style="color: #800000;">slaveDelay</span><span style="color: #800000;">"</span> : NumberLong(<span style="color: #800080;">0</span><span style="color: #000000;">),
</span><span style="color: #800000;">"</span><span style="color: #800000;">votes</span><span style="color: #800000;">"</span> : <span style="color: #800080;">1</span><span style="color: #000000;">
},
{
</span><span style="color: #800000;">"</span><span style="color: #800000;">_id</span><span style="color: #800000;">"</span> : <span style="color: #800080;">3</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">host</span><span style="color: #800000;">"</span> : <span style="color: #800000;">"</span><span style="color: #800000;">192.168.10.42:27017</span><span style="color: #800000;">"</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">arbiterOnly</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">buildIndexes</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">true</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">hidden</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">false</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">priority</span><span style="color: #800000;">"</span> : <span style="color: #800080;">2</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">tags</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
},
</span><span style="color: #800000;">"</span><span style="color: #800000;">slaveDelay</span><span style="color: #800000;">"</span> : NumberLong(<span style="color: #800080;">0</span><span style="color: #000000;">),
</span><span style="color: #800000;">"</span><span style="color: #800000;">votes</span><span style="color: #800000;">"</span> : <span style="color: #800080;">1</span><span style="color: #000000;">
}
],
</span><span style="color: #800000;">"</span><span style="color: #800000;">settings</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
</span><span style="color: #800000;">"</span><span style="color: #800000;">chainingAllowed</span><span style="color: #800000;">"</span> : <span style="color: #0000ff;">true</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">heartbeatIntervalMillis</span><span style="color: #800000;">"</span> : <span style="color: #800080;">2000</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">heartbeatTimeoutSecs</span><span style="color: #800000;">"</span> : <span style="color: #800080;">10</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">electionTimeoutMillis</span><span style="color: #800000;">"</span> : <span style="color: #800080;">10000</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">catchUpTimeoutMillis</span><span style="color: #800000;">"</span> : -<span style="color: #800080;">1</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">catchUpTakeoverDelayMillis</span><span style="color: #800000;">"</span> : <span style="color: #800080;">30000</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">getLastErrorModes</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
},
</span><span style="color: #800000;">"</span><span style="color: #800000;">getLastErrorDefaults</span><span style="color: #800000;">"</span><span style="color: #000000;"> : {
</span><span style="color: #800000;">"</span><span style="color: #800000;">w</span><span style="color: #800000;">"</span> : <span style="color: #800080;">1</span><span style="color: #000000;">,
</span><span style="color: #800000;">"</span><span style="color: #800000;">wtimeout</span><span style="color: #800000;">"</span> : <span style="color: #800080;">0</span><span style="color: #000000;">
},
</span><span style="color: #800000;">"</span><span style="color: #800000;">replicaSetId</span><span style="color: #800000;">"</span> : ObjectId(<span style="color: #800000;">"</span><span style="color: #800000;">5ef1b03c01bba8d9a6759c18</span><span style="color: #800000;">"</span><span style="color: #000000;">)
}
}
rstest:PRIMARY</span>>

 (二)防止次级(secondary)节点变为主节点

只需将节点的优先级调整为0即可

cfg =<span style="color: #000000;"> rs.conf()
cfg.members[</span><span style="color: #800080;">1</span>].priority = <span style="color: #800080;">0</span><span style="color: #000000;">
rs.reconfig(cfg)</span>

(三)配置隐藏节点成员(Hidden Replica Set Member)
隐藏节点成员是副本集的一部分，但是隐藏节点不会被选举为主节点，且对客户端应用是不可见的。隐藏节点可以参与投票。
隐藏节点通常使用在延迟复制上。
如果要配置隐藏节点，需要将members[n].priority值设为0，将members[n].hidden设置为true。

cfg =<span style="color: #000000;"> rs.conf()
cfg.members[</span><span style="color: #800080;">0</span>].priority = <span style="color: #800080;">0</span><span style="color: #000000;">
cfg.members[</span><span style="color: #800080;">0</span>].hidden = <span style="color: #0000ff;">true</span><span style="color: #000000;">
rs.reconfig(cfg)</span>

重新配置集合后，其它成员在使用isMaster或db.isMaster()输出中不会显示隐藏成员。

(四)配置延迟节点成员(Delayed Replica Set Member)
要配置延迟的辅助成员，需要将members[n].priority设置为0，将members[n].hidden设置为true，将members[n].slaveDelay值设置为延迟秒数。
例如，这里把节点0配置为延迟节点，延迟时间为3600s。

cfg =<span style="color: #000000;"> rs.conf()
cfg.members[</span><span style="color: #800080;">0</span>].priority = <span style="color: #800080;">0</span><span style="color: #000000;">
cfg.members[</span><span style="color: #800080;">0</span>].hidden = <span style="color: #0000ff;">true</span><span style="color: #000000;">
cfg.members[</span><span style="color: #800080;">0</span>].slaveDelay = <span style="color: #800080;">3600</span><span style="color: #000000;">
rs.reconfig(cfg)</span>

注意：延迟节点的延迟必须要oplog的窗口内，如果oplog短于members[n].slaveDelay窗口，延迟节点将不能成功复制。

(五)配置非投票节点(Non-Voting Replica Set Member)
mongoDB最多允许有50个节点，其中最多7个投票节点。要将成员配置为非投票节点，只需将votes和priority都设置为0。

cfg =<span style="color: #000000;"> rs.conf()
cfg.members[n].votes </span>= <span style="color: #800080;">0</span><span style="color: #000000;">
cfg.members[n].priority </span>= <span style="color: #800080;">0</span><span style="color: #000000;">
rs.reconfig()</span>

【完】 

MongoDB副本集replica set（四）--成员配置

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