Start mongo and bind with interface
sudo docker run --name mongo1 -d -p 27017:27017 mongo --bind_ip_all --replSet rs1
sudo docker run --name mongo2 -d -p 27018:27017 mongo --bind_ip_all --replSet rs1
sudo docker run --name mongo3 -d -p 27019:27017 mongo --bind_ip_all --replSet rs1
Check ip address
mongo1 => 172.17.0.2
mongo2 => 172.17.0.3
mongo3 => 172.17.0.4
isaac@isaac-emachines-ET1870:~$ sudo docker inspect mongo1 | grep IPAddress
"SecondaryIPAddresses": null,
"IPAddress": "172.17.0.2",
"IPAddress": "172.17.0.2",
isaac@isaac-emachines-ET1870:~$ sudo docker inspect mongo2 | grep IPAddress
"SecondaryIPAddresses": null,
"IPAddress": "172.17.0.3",
"IPAddress": "172.17.0.3",
isaac@isaac-emachines-ET1870:~$ sudo docker inspect mongo3 | grep IPAddress
"SecondaryIPAddresses": null,
"IPAddress": "172.17.0.4",
"IPAddress": "172.17.0.4",
Install mongo client
sudo apt install mongodb-clients
Connect mongo client to port 27017
:~$ mongo --port 27017
MongoDB shell version v3.6.3
connecting to: mongodb://127.0.0.1:27017/
MongoDB server version: 4.4.1
WARNING: shell and server versions do not match
Server has startup warnings:
{"t":{"$date":"2020-10-29T10:41:36.684+00:00"},"s":"I", "c":"STORAGE", "id":22297, "ctx":"initandlisten","msg":"Using the XFS filesystem is strongly recommended with the WiredTiger storage engine. See http://dochub.mongodb.org/core/prodnotes-filesystem","tags":["startupWarnings"]}
{"t":{"$date":"2020-10-29T10:41:38.172+00:00"},"s":"W", "c":"CONTROL", "id":22120, "ctx":"initandlisten","msg":"Access control is not enabled for the database. Read and write access to data and configuration is unrestricted","tags":["startupWarnings"]}
Show rs.status()
Notice replset config is not received
> rs.status()
{
"operationTime" : Timestamp(0, 0),
"ok" : 0,
"errmsg" : "no replset config has been received",
"code" : 94,
"codeName" : "NotYetInitialized",
"$clusterTime" : {
"clusterTime" : Timestamp(0, 0),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
Prepare rsconfig
rsconf = {
_id:"rs1",
members:[
{_id:0, host:"172.17.0.2:27017"},
{_id:1, host:"172.17.0.3:27017"},
{_id:2, host:"172.17.0.4:27017"},
]
}
Input to mongo-client and initiate replica set
> rsconf = {
... _id:"rs1",
... members:[
... {_id:0, host:"172.17.0.2:27017"},
... {_id:1, host:"172.17.0.3:27017"},
... {_id:2, host:"172.17.0.4:27017"},
... ]
... }
{
"_id" : "rs1",
"members" : [
{
"_id" : 0,
"host" : "172.17.0.2:27017"
},
{
"_id" : 1,
"host" : "172.17.0.3:27017"
},
{
"_id" : 2,
"host" : "172.17.0.4:27017"
}
]
}
> rs.initiate(rsconf)
{
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1603982247, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1603982247, 1)
}
rs1:SECONDARY>
Show members
rs1:PRIMARY> rs.status()
{
"set" : "rs1",
"date" : ISODate("2020-10-29T18:17:13.202Z"),
"myState" : 1,
"term" : NumberLong(1),
"syncSourceHost" : "",
"syncSourceId" : -1,
"heartbeatIntervalMillis" : NumberLong(2000),
"majorityVoteCount" : 2,
"writeMajorityCount" : 2,
"votingMembersCount" : 3,
"writableVotingMembersCount" : 3,
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1603995431, 1),
"t" : NumberLong(1)
},
"lastCommittedWallTime" : ISODate("2020-10-29T18:17:11.315Z"),
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1603995431, 1),
"t" : NumberLong(1)
},
"readConcernMajorityWallTime" : ISODate("2020-10-29T18:17:11.315Z"),
"appliedOpTime" : {
"ts" : Timestamp(1603995431, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1603995431, 1),
"t" : NumberLong(1)
},
"lastAppliedWallTime" : ISODate("2020-10-29T18:17:11.315Z"),
"lastDurableWallTime" : ISODate("2020-10-29T18:17:11.315Z")
},
"lastStableRecoveryTimestamp" : Timestamp(1603995421, 1),
"electionCandidateMetrics" : {
"lastElectionReason" : "electionTimeout",
"lastElectionDate" : ISODate("2020-10-29T14:37:39.776Z"),
"electionTerm" : NumberLong(1),
"lastCommittedOpTimeAtElection" : {
"ts" : Timestamp(0, 0),
"t" : NumberLong(-1)
},
"lastSeenOpTimeAtElection" : {
"ts" : Timestamp(1603982247, 1),
"t" : NumberLong(-1)
},
"numVotesNeeded" : 2,
"priorityAtElection" : 1,
"electionTimeoutMillis" : NumberLong(10000),
"numCatchUpOps" : NumberLong(0),
"newTermStartDate" : ISODate("2020-10-29T14:37:40.542Z"),
"wMajorityWriteAvailabilityDate" : ISODate("2020-10-29T14:37:42.121Z")
},
"members" : [
{
"_id" : 0,
"name" : "172.17.0.2:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 27337,
"optime" : {
"ts" : Timestamp(1603995431, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-10-29T18:17:11Z"),
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "",
"electionTime" : Timestamp(1603982259, 1),
"electionDate" : ISODate("2020-10-29T14:37:39Z"),
"configVersion" : 1,
"configTerm" : 1,
"self" : true,
"lastHeartbeatMessage" : ""
},
{
"_id" : 1,
"name" : "172.17.0.3:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 13185,
"optime" : {
"ts" : Timestamp(1603995431, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1603995431, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-10-29T18:17:11Z"),
"optimeDurableDate" : ISODate("2020-10-29T18:17:11Z"),
"lastHeartbeat" : ISODate("2020-10-29T18:17:12.066Z"),
"lastHeartbeatRecv" : ISODate("2020-10-29T18:17:13.100Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncSourceHost" : "172.17.0.2:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 1,
"configTerm" : 1
},
{
"_id" : 2,
"name" : "172.17.0.4:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 13185,
"optime" : {
"ts" : Timestamp(1603995431, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1603995431, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-10-29T18:17:11Z"),
"optimeDurableDate" : ISODate("2020-10-29T18:17:11Z"),
"lastHeartbeat" : ISODate("2020-10-29T18:17:12.042Z"),
"lastHeartbeatRecv" : ISODate("2020-10-29T18:17:13.134Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncSourceHost" : "172.17.0.2:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 1,
"configTerm" : 1
}
],
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1603995431, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1603995431, 1)
}
Insert 1000 records
rs1:PRIMARY> use test
switched to db test
rs1:PRIMARY> for (i=0; i<1000; i++) {db.coll.insert({count:1})}
WriteResult({ "nInserted" : 1 })
rs1:PRIMARY> db.coll.count()
1000
Check isMaster
rs1:PRIMARY> db.isMaster()
{
"topologyVersion" : {
"processId" : ObjectId("5f9a9c60e604cb72e52ff28e"),
"counter" : NumberLong(6)
},
"hosts" : [
"172.17.0.2:27017",
"172.17.0.3:27017",
"172.17.0.4:27017"
],
"setName" : "rs1",
"setVersion" : 1,
"ismaster" : true,
"secondary" : false,
"primary" : "172.17.0.2:27017",
"me" : "172.17.0.2:27017",
"electionId" : ObjectId("7fffffff0000000000000001"),
"lastWrite" : {
"opTime" : {
"ts" : Timestamp(1604044322, 1),
"t" : NumberLong(1)
},
"lastWriteDate" : ISODate("2020-10-30T07:52:02Z"),
"majorityOpTime" : {
"ts" : Timestamp(1604044322, 1),
"t" : NumberLong(1)
},
"majorityWriteDate" : ISODate("2020-10-30T07:52:02Z")
},
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 100000,
"localTime" : ISODate("2020-10-30T07:52:11.864Z"),
"logicalSessionTimeoutMinutes" : 30,
"connectionId" : 33,
"minWireVersion" : 0,
"maxWireVersion" : 9,
"readOnly" : false,
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1604044322, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1604044322, 1)
}
Connect to master DB and query will success
~$ mongo --port 27019
MongoDB shell version v3.6.3
connecting to: mongodb://127.0.0.1:27019/
MongoDB server version: 4.4.1
WARNING: shell and server versions do not match
Server has startup warnings:
{"t":{"$date":"2020-10-29T10:41:49.380+00:00"},"s":"I", "c":"STORAGE", "id":22297, "ctx":"initandlisten","msg":"Using the XFS filesystem is strongly recommended with the WiredTiger storage engine. See http://dochub.mongodb.org/core/prodnotes-filesystem","tags":["startupWarnings"]}
{"t":{"$date":"2020-10-29T10:41:51.036+00:00"},"s":"W", "c":"CONTROL", "id":22120, "ctx":"initandlisten","msg":"Access control is not enabled for the database. Read and write access to data and configuration is unrestricted","tags":["startupWarnings"]}
rs1:SECONDARY> conn1 = new Mongo("172.17.0.2:27017")
connection to 172.17.0.2:27017
rs1:SECONDARY> db1 = conn1.getDB("test")
test
rs1:SECONDARY> db1.coll.find()
{ "_id" : ObjectId("5f9bc53af256e53d936e29bb"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29bc"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29bd"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29be"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29bf"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29c0"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29c1"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29c2"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29c3"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29c4"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29c5"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29c6"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29c7"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29c8"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29c9"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29ca"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29cb"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29cc"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29cd"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29ce"), "count" : 1 }
Connect to secondary DB
Secondaries will refuce read request by default
~$ mongo --port 27019
MongoDB shell version v3.6.3
connecting to: mongodb://127.0.0.1:27019/
MongoDB server version: 4.4.1
WARNING: shell and server versions do not match
Server has startup warnings:
{"t":{"$date":"2020-10-29T10:41:49.380+00:00"},"s":"I", "c":"STORAGE", "id":22297, "ctx":"initandlisten","msg":"Using the XFS filesystem is strongly recommended with the WiredTiger storage engine. See http://dochub.mongodb.org/core/prodnotes-filesystem","tags":["startupWarnings"]}
{"t":{"$date":"2020-10-29T10:41:51.036+00:00"},"s":"W", "c":"CONTROL", "id":22120, "ctx":"initandlisten","msg":"Access control is not enabled for the database. Read and write access to data and configuration is unrestricted","tags":["startupWarnings"]}
rs1:SECONDARY> conn2 = new Mongo("172.17.0.3:27017")
connection to 172.17.0.3:27017
rs1:SECONDARY> db2 = conn2.getDB("test")
test
rs1:SECONDARY> db2.coll.find()
Error: error: {
"topologyVersion" : {
"processId" : ObjectId("5f9a9c67f63d0c64a80a5bd0"),
"counter" : NumberLong(4)
},
"operationTime" : Timestamp(1604045052, 1),
"ok" : 0,
"errmsg" : "not master and slaveOk=false",
"code" : 13435,
"codeName" : "NotMasterNoSlaveOk",
"$clusterTime" : {
"clusterTime" : Timestamp(1604045052, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
Allow read from secondaries by setSlaveOk()
rs1:SECONDARY> conn2.setSlaveOk()
rs1:SECONDARY> db2.coll.find()
{ "_id" : ObjectId("5f9bc53af256e53d936e29bb"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29bc"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29bd"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29cb"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29c5"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29d7"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e29f5"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e2a06"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e2a0a"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e2a33"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e2a3f"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e2a48"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e2a54"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e2a6a"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53af256e53d936e2a80"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53bf256e53d936e2ac3"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53bf256e53d936e2ad4"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53bf256e53d936e2ad6"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53bf256e53d936e2af9"), "count" : 1 }
{ "_id" : ObjectId("5f9bc53bf256e53d936e2aff"), "count" : 1 }
Type "it" for more
Write on secondary will fail
Secondaries will get write only through replication from master
rs1:SECONDARY> db2.coll.insert({"count":1001})
WriteResult({ "writeError" : { "code" : 10107, "errmsg" : "not master" } })
If primary goes down, one of the secondaries will automatically be elected primary.
Remove and add node
// connect primary
~$ mongo --port 27017
MongoDB shell version v3.6.3
connecting to: mongodb://127.0.0.1:27017/
MongoDB server version: 4.4.1
WARNING: shell and server versions do not match
Server has startup warnings:
{"t":{"$date":"2020-10-29T10:41:36.684+00:00"},"s":"I", "c":"STORAGE", "id":22297, "ctx":"initandlisten","msg":"Using the XFS filesystem is strongly recommended with the WiredTiger storage engine. See http://dochub.mongodb.org/core/prodnotes-filesystem","tags":["startupWarnings"]}
{"t":{"$date":"2020-10-29T10:41:38.172+00:00"},"s":"W", "c":"CONTROL", "id":22120, "ctx":"initandlisten","msg":"Access control is not enabled for the database. Read and write access to data and configuration is unrestricted","tags":["startupWarnings"]}
rs1:PRIMARY>
// check primary and secondaries
rs1:PRIMARY> rs.isMaster()
{
"topologyVersion" : {
"processId" : ObjectId("5f9a9c60e604cb72e52ff28e"),
"counter" : NumberLong(6)
},
"hosts" : [
"172.17.0.2:27017",
"172.17.0.3:27017",
"172.17.0.4:27017"
],
"setName" : "rs1",
"setVersion" : 1,
"ismaster" : true,
"secondary" : false,
"primary" : "172.17.0.2:27017",
"me" : "172.17.0.2:27017",
"electionId" : ObjectId("7fffffff0000000000000001"),
"lastWrite" : {
"opTime" : {
"ts" : Timestamp(1604047942, 1),
"t" : NumberLong(1)
},
"lastWriteDate" : ISODate("2020-10-30T08:52:22Z"),
"majorityOpTime" : {
"ts" : Timestamp(1604047942, 1),
"t" : NumberLong(1)
},
"majorityWriteDate" : ISODate("2020-10-30T08:52:22Z")
},
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 100000,
"localTime" : ISODate("2020-10-30T08:52:27.262Z"),
"logicalSessionTimeoutMinutes" : 30,
"connectionId" : 36,
"minWireVersion" : 0,
"maxWireVersion" : 9,
"readOnly" : false,
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1604047942, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1604047942, 1)
}
// remove secondary node: 172.17.0.3:27017
rs1:PRIMARY> rs.remove("172.17.0.3:27017")
{
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1604048022, 2),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1604048022, 2)
}
// check isMaster
rs1:PRIMARY> rs.isMaster()
{
"topologyVersion" : {
"processId" : ObjectId("5f9a9c60e604cb72e52ff28e"),
"counter" : NumberLong(7)
},
"hosts" : [
"172.17.0.2:27017",
"172.17.0.4:27017"
],
"setName" : "rs1",
"setVersion" : 2,
"ismaster" : true,
"secondary" : false,
"primary" : "172.17.0.2:27017",
"me" : "172.17.0.2:27017",
"electionId" : ObjectId("7fffffff0000000000000001"),
"lastWrite" : {
"opTime" : {
"ts" : Timestamp(1604048062, 1),
"t" : NumberLong(1)
},
"lastWriteDate" : ISODate("2020-10-30T08:54:22Z"),
"majorityOpTime" : {
"ts" : Timestamp(1604048062, 1),
"t" : NumberLong(1)
},
"majorityWriteDate" : ISODate("2020-10-30T08:54:22Z")
},
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 100000,
"localTime" : ISODate("2020-10-30T08:54:24.595Z"),
"logicalSessionTimeoutMinutes" : 30,
"connectionId" : 36,
"minWireVersion" : 0,
"maxWireVersion" : 9,
"readOnly" : false,
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1604048062, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1604048062, 1)
}
// add node back
rs1:PRIMARY> rs.add("172.17.0.3:27017")
{
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1604048096, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1604048096, 1)
}
// check isMaster
rs1:PRIMARY> rs.isMaster()
{
"topologyVersion" : {
"processId" : ObjectId("5f9a9c60e604cb72e52ff28e"),
"counter" : NumberLong(8)
},
"hosts" : [
"172.17.0.2:27017",
"172.17.0.4:27017",
"172.17.0.3:27017"
],
"setName" : "rs1",
"setVersion" : 3,
"ismaster" : true,
"secondary" : false,
"primary" : "172.17.0.2:27017",
"me" : "172.17.0.2:27017",
"electionId" : ObjectId("7fffffff0000000000000001"),
"lastWrite" : {
"opTime" : {
"ts" : Timestamp(1604048112, 1),
"t" : NumberLong(1)
},
"lastWriteDate" : ISODate("2020-10-30T08:55:12Z"),
"majorityOpTime" : {
"ts" : Timestamp(1604048112, 1),
"t" : NumberLong(1)
},
"majorityWriteDate" : ISODate("2020-10-30T08:55:12Z")
},
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 100000,
"localTime" : ISODate("2020-10-30T08:55:14.066Z"),
"logicalSessionTimeoutMinutes" : 30,
"connectionId" : 36,
"minWireVersion" : 0,
"maxWireVersion" : 9,
"readOnly" : false,
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1604048112, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1604048112, 1)
}
Check config by rs.config()
rs1:PRIMARY> rs.config()
{
"_id" : "rs1",
"version" : 3,
"term" : 1,
"protocolVersion" : NumberLong(1),
"writeConcernMajorityJournalDefault" : true,
"members" : [
{
"_id" : 0,
"host" : "172.17.0.2:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 2,
"host" : "172.17.0.4:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 3,
"host" : "172.17.0.3:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatIntervalMillis" : 2000,
"heartbeatTimeoutSecs" : 10,
"electionTimeoutMillis" : 10000,
"catchUpTimeoutMillis" : -1,
"catchUpTakeoverDelayMillis" : 30000,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
},
"replicaSetId" : ObjectId("5f9ad3a6e604cb72e52ff2f2")
}
}
Other commands
- Modify config: rs.reconfig
