Shulou(Shulou.com)05/31 Report--

How to implement replica set in MongoDB? aiming at this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible way.

1. Environment

Node IP operating system MongoDB data node 110.163.91.15RHLE6.5_x64mongodb-linux-x86_64-rhel62-3.4.7.tgz data node 210.163.91.16RHLE6.5_x64mongodb-linux-x86_64-rhel62-3.4.7.tgz data node 310.163.91.17RHLE6.5_x64mongodb-linux-x86_64-rhel62-3.4.7.tgz

2. Install, configure and start MongoDB on three nodes

[root@D2-POMS15 ~] # rpm-qa | grep openssl

Openssl098e-0.9.8e-17.el6_2.2.x86_64

Openssl-1.0.1e-15.el6.x86_64

[root@D2-POMS15 ~] # mkdir / usr/local/mongodb

[root@D2-POMS15] # tar-xvzf mongodb-linux-x86_64-rhel62-3.4.7.tgz

[root@D2-POMS15] # mv mongodb-linux-x86_64-rhel62-3.4.7Universe * / usr/local/mongodb/

[root@D2-POMS15 ~] # vim .bash _ profile

# .bash _ profile

# Get the aliases and functions

If [- f ~ / .bashrc]; then

. ~ / .bashrc

Fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

Export PATH=$PATH:/usr/local/mongodb/bin/

Export PATH

[root@D2-POMS15] #. .bash _ profile

[root@D2-POMS15 ~] # mkdir / usr/local/mongodb/db

[root@D2-POMS15 ~] # mkdir / usr/local/mongodb/log

[root@D2-POMS15 ~] # touch / usr/local/mongodb/log/mongodb.log

[root@D2-POMS15 ~] # vim / usr/local/mongodb/mongodb.conf

Dbpath=/usr/local/mongodb/db

Logpath=/usr/local/mongodb/log/mongodb.log

Logappend=true

Noauth=true

Port=27017

Fork=true

ReplSet=stoners

[root@D2-POMS15] # mongod-f / usr/local/mongodb/mongodb.conf

About to fork child process, waiting until server is ready for connections.

Forked process: 11580

Child process started successfully, parent exiting

[root@D2-POMS15 ~] # mongo

MongoDB shell version v3.4.7

Connecting to: mongodb://127.0.0.1:27017

MongoDB server version: 3.4.7

Welcome to the MongoDB shell.

[root@D2-POMS15] # mongod-f / usr/local/mongodb/mongodb.conf

[root@D2-POMS16] # mongod-f / usr/local/mongodb/mongodb.conf

[root@D2-POMS17] # mongod-f / usr/local/mongodb/mongodb.conf

3. Configure the replica set at any node

Initialize the replica set configuration.

Syntax:

{

_ id:

Members: [

{_ id: 0, host:}

{_ id: 1, host:}

{_ id: 2, host:}

]

}

Configure one of the nodes as the syntax for quorum:

{

_ id: "my_replica_set"

Members: [

{_ id: 0, host: "rs1.example.net:27017"}

{_ id: 1, host: "rs2.example.net:27017"}

{_ id: 2, host: "rs3.example.net", arbiterOnly: true}

]

}

> rs.initiate ({_ id: "stoners", members: [{_ id:0,host: "10.163.97.15 virtual 27017"}]})

{"ok": 1}

Stoners:SECONDARY > rs.conf ()

{

"_ id": "stoners"

"version": 1

"protocolVersion": NumberLong (1)

"members": [

{

"_ id": 0

"host": "10.163.97.15 purl 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": 60000

"getLastErrorModes": {

}

"getLastErrorDefaults": {

"w": 1

"wtimeout": 0

}

"replicaSetId": ObjectId ("5996b49a33625594149428f2")

}

}

Add a node:

Stoners:PRIMARY > rs.add ("10.163.97.16")

{"ok": 1}

Stoners:PRIMARY > rs.add ("10.163.97.17")

{"ok": 1}

View status:

Stoners:PRIMARY > rs.status ()

{

"set": "stoners"

Date: ISODate ("2017-08-18T09:49:18.307Z")

"myState": 1

"term": NumberLong (1)

"heartbeatIntervalMillis": NumberLong (2000)

"optimes": {

"lastCommittedOpTime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

"appliedOpTime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

"durableOpTime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

}

"members": [

{

"_ id": 0

"name": "10.163.97.15 purl 27017"

"health": 1

"state": 1

"stateStr": "PRIMARY"

"uptime": 144

"optime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

OptimeDate: ISODate ("2017-08-18T09:49:15Z")

"infoMessage": "could not find member to sync from"

ElectionTime: Timestamp (1503049643, 2)

ElectionDate: ISODate ("2017-08-18T09:47:23Z")

"configVersion": 3

"self": true

}

{

"_ id": 1

"name": "10.163.97.16 purl 27017"

"health": 1

"state": 2

"stateStr": "SECONDARY"

"uptime": 86

"optime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

"optimeDurable": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

OptimeDate: ISODate ("2017-08-18T09:49:15Z")

OptimeDurableDate: ISODate ("2017-08-18T09:49:15Z")

LastHeartbeat: ISODate ("2017-08-18T09:49:17.787Z")

LastHeartbeatRecv: ISODate ("2017-08-18T09:49:16.774Z")

"pingMs": NumberLong (0)

"syncingTo": "10.163.97.15 purl 27017"

"configVersion": 3

}

{

"_ id": 2

"name": "10.163.97.17 purl 27017"

"health": 1

"state": 2

"stateStr": "SECONDARY"

"uptime": 52

"optime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

"optimeDurable": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

OptimeDate: ISODate ("2017-08-18T09:49:15Z")

OptimeDurableDate: ISODate ("2017-08-18T09:49:15Z")

LastHeartbeat: ISODate ("2017-08-18T09:49:17.787Z")

LastHeartbeatRecv: ISODate ("2017-08-18T09:49:16.883Z")

"pingMs": NumberLong (0)

"syncingTo": "10.163.97.15 purl 27017"

"configVersion": 3

}

]

"ok": 1

}

4. Write test data

The primary node writes data:

Stoners:PRIMARY > use hr

Switched to db hr

Stoners:PRIMARY > db.emp.insert ({"num": 1})

WriteResult ({"nInserted": 1})

Stoners:PRIMARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

Directly query the replica node and report an error:

Stoners:SECONDARY > use hr

Switched to db hr

Stoners:SECONDARY > db.emp.find ()

Error: error: {

"ok": 0

"errmsg": "not master and slaveOk=false"

"code": 13435

"codeName": "NotMasterNoSlaveOk"

}

Set copy node to be readable:

Stoners:SECONDARY > db.getMongo (). SetSlaveOk ()

Stoners:SECONDARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

Another replica node:

Stoners:SECONDARY > db.getMongo (). SetSlaveOk ()

Stoners:SECONDARY > use hr

Switched to db hr

Stoners:SECONDARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

5. Test failover

Close the primary node first:

Stoners:PRIMARY > use admin

Switched to db admin

Stoners:PRIMARY > db.shutdownServer ()

Server should be down...

One of the replica nodes becomes the primary node:

Stoners:SECONDARY >

Stoners:PRIMARY >

Stoners:PRIMARY > rs.status ()

{

"set": "stoners"

Date: ISODate ("2017-08-18T10:03:49.050Z")

"myState": 1

"term": NumberLong (2)

"heartbeatIntervalMillis": NumberLong (2000)

"optimes": {

"lastCommittedOpTime": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

"appliedOpTime": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

"durableOpTime": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

}

"members": [

{

"_ id": 0

"name": "10.163.97.15 purl 27017"

"health": 0

"state": 8

"stateStr": "(not reachable/healthy)

"uptime": 0

"optime": {

"ts": Timestamp (0,0)

"t": NumberLong (- 1)

}

"optimeDurable": {

"ts": Timestamp (0,0)

"t": NumberLong (- 1)

}

OptimeDate: ISODate ("1970-01-01T00:00:00Z")

OptimeDurableDate: ISODate ("1970-01-01T00:00:00Z")

LastHeartbeat: ISODate ("2017-08-18T10:03:47.314Z")

LastHeartbeatRecv: ISODate ("2017-08-18T10:01:03.792Z")

"pingMs": NumberLong (0)

"lastHeartbeatMessage": "Connection refused"

"configVersion":-1

}

{

"_ id": 1

"name": "10.163.97.16 purl 27017"

"health": 1

"state": 1

"stateStr": "PRIMARY"

Uptime: 929

"optime": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

OptimeDate: ISODate ("2017-08-18T10:03:44Z")

ElectionTime: Timestamp (1503050473, 1)

ElectionDate: ISODate ("2017-08-18T10:01:13Z")

"configVersion": 3

"self": true

}

{

"_ id": 2

"name": "10.163.97.17 purl 27017"

"health": 1

"state": 2

"stateStr": "SECONDARY"

Uptime: 845

"optime": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

"optimeDurable": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

OptimeDate: ISODate ("2017-08-18T10:03:44Z")

OptimeDurableDate: ISODate ("2017-08-18T10:03:44Z")

LastHeartbeat: ISODate ("2017-08-18T10:03:47.252Z")

LastHeartbeatRecv: ISODate ("2017-08-18T10:03:47.998Z")

"pingMs": NumberLong (0)

"syncingTo": "10.163.97.16 purl 27017"

"configVersion": 3

}

]

"ok": 1

}

Insert data on the primary node:

Stoners:PRIMARY > use hr

Switched to db hr

Stoners:PRIMARY > db.emp.insert ({"num": 2})

WriteResult ({"nInserted": 1})

Stoners:PRIMARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

{"_ id": ObjectId ("5996bbcb5945237d11f3052d"), "num": 2}

View in another replica node:

Stoners:SECONDARY > use hr

Switched to db hr

Stoners:SECONDARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

{"_ id": ObjectId ("5996bbcb5945237d11f3052d"), "num": 2}

Now start and shut down the node:

[root@D2-POMS15] # mongod-f / usr/local/mongodb/mongodb.conf

Automatically become a replica node after startup:

Stoners:SECONDARY > rs.status ()

{

"set": "stoners"

Date: ISODate ("2017-08-18T10:08:25.401Z")

"myState": 2

"term": NumberLong (2)

"syncingTo": "10.163.97.17 purl 27017"

"heartbeatIntervalMillis": NumberLong (2000)

"optimes": {

"lastCommittedOpTime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

"appliedOpTime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

"durableOpTime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

}

"members": [

{

"_ id": 0

"name": "10.163.97.15 purl 27017"

"health": 1

"state": 2

"stateStr": "SECONDARY"

"uptime": 49

"optime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

OptimeDate: ISODate ("2017-08-18T10:09:34Z")

"syncingTo": "10.163.97.17 purl 27017"

"configVersion": 3

"self": true

}

{

"_ id": 1

"name": "10.163.97.16 purl 27017"

"health": 1

"state": 1

"stateStr": "PRIMARY"

"uptime": 48

"optime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

"optimeDurable": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

OptimeDate: ISODate ("2017-08-18T10:09:34Z")

OptimeDurableDate: ISODate ("2017-08-18T10:09:34Z")

LastHeartbeat: ISODate ("2017-08-18T10:08:24.973Z")

LastHeartbeatRecv: ISODate ("2017-08-18T10:08:23.753Z")

"pingMs": NumberLong (0)

ElectionTime: Timestamp (1503050473, 1)

ElectionDate: ISODate ("2017-08-18T10:01:13Z")

"configVersion": 3

}

{

"_ id": 2

"name": "10.163.97.17 purl 27017"

"health": 1

"state": 2

"stateStr": "SECONDARY"

"uptime": 48

"optime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

"optimeDurable": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

OptimeDate: ISODate ("2017-08-18T10:09:34Z")

OptimeDurableDate: ISODate ("2017-08-18T10:09:34Z")

LastHeartbeat: ISODate ("2017-08-18T10:08:24.973Z")

LastHeartbeatRecv: ISODate ("2017-08-18T10:08:23.520Z")

"pingMs": NumberLong (0)

"syncingTo": "10.163.97.16 purl 27017"

"configVersion": 3

}

]

"ok": 1

}

The data is also synchronized.

Stoners:SECONDARY > db.getMongo (). SetSlaveOk ()

Stoners:SECONDARY > use hr

Switched to db hr

Stoners:SECONDARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

{"_ id": ObjectId ("5996bbcb5945237d11f3052d"), "num": 2}

2. Install, configure and start MongoDB on three nodes

[root@D2-POMS15 ~] # rpm-qa | grep openssl

Openssl098e-0.9.8e-17.el6_2.2.x86_64

Openssl-1.0.1e-15.el6.x86_64

[root@D2-POMS15 ~] # mkdir / usr/local/mongodb

[root@D2-POMS15] # tar-xvzf mongodb-linux-x86_64-rhel62-3.4.7.tgz

[root@D2-POMS15] # mv mongodb-linux-x86_64-rhel62-3.4.7Universe * / usr/local/mongodb/

[root@D2-POMS15 ~] # vim .bash _ profile

# .bash _ profile

# Get the aliases and functions

If [- f ~ / .bashrc]; then

. ~ / .bashrc

Fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

Export PATH=$PATH:/usr/local/mongodb/bin/

Export PATH

[root@D2-POMS15] #. .bash _ profile

[root@D2-POMS15 ~] # mkdir / usr/local/mongodb/db

[root@D2-POMS15 ~] # mkdir / usr/local/mongodb/log

[root@D2-POMS15 ~] # touch / usr/local/mongodb/log/mongodb.log

[root@D2-POMS15 ~] # vim / usr/local/mongodb/mongodb.conf

Dbpath=/usr/local/mongodb/db

Logpath=/usr/local/mongodb/log/mongodb.log

Logappend=true

Noauth=true

Port=27017

Fork=true

ReplSet=stoners

[root@D2-POMS15] # mongod-f / usr/local/mongodb/mongodb.conf

About to fork child process, waiting until server is ready for connections.

Forked process: 11580

Child process started successfully, parent exiting

[root@D2-POMS15 ~] # mongo

MongoDB shell version v3.4.7

Connecting to: mongodb://127.0.0.1:27017

MongoDB server version: 3.4.7

Welcome to the MongoDB shell.

[root@D2-POMS15] # mongod-f / usr/local/mongodb/mongodb.conf

[root@D2-POMS16] # mongod-f / usr/local/mongodb/mongodb.conf

[root@D2-POMS17] # mongod-f / usr/local/mongodb/mongodb.conf

3. Configure the replica set at any node

Initialize the replica set configuration.

Syntax:

{

_ id:

Members: [

{_ id: 0, host:}

{_ id: 1, host:}

{_ id: 2, host:}

]

}

Configure one of the nodes as the syntax for quorum:

{

_ id: "my_replica_set"

Members: [

{_ id: 0, host: "rs1.example.net:27017"}

{_ id: 1, host: "rs2.example.net:27017"}

{_ id: 2, host: "rs3.example.net", arbiterOnly: true}

]

}

> rs.initiate ({_ id: "stoners", members: [{_ id:0,host: "10.163.97.15 virtual 27017"}]})

{"ok": 1}

Stoners:SECONDARY > rs.conf ()

{

"_ id": "stoners"

"version": 1

"protocolVersion": NumberLong (1)

"members": [

{

"_ id": 0

"host": "10.163.97.15 purl 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": 60000

"getLastErrorModes": {

}

"getLastErrorDefaults": {

"w": 1

"wtimeout": 0

}

"replicaSetId": ObjectId ("5996b49a33625594149428f2")

}

}

Add a node:

Stoners:PRIMARY > rs.add ("10.163.97.16")

{"ok": 1}

Stoners:PRIMARY > rs.add ("10.163.97.17")

{"ok": 1}

View status:

Stoners:PRIMARY > rs.status ()

{

"set": "stoners"

Date: ISODate ("2017-08-18T09:49:18.307Z")

"myState": 1

"term": NumberLong (1)

"heartbeatIntervalMillis": NumberLong (2000)

"optimes": {

"lastCommittedOpTime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

"appliedOpTime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

"durableOpTime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

}

"members": [

{

"_ id": 0

"name": "10.163.97.15 purl 27017"

"health": 1

"state": 1

"stateStr": "PRIMARY"

"uptime": 144

"optime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

OptimeDate: ISODate ("2017-08-18T09:49:15Z")

"infoMessage": "could not find member to sync from"

ElectionTime: Timestamp (1503049643, 2)

ElectionDate: ISODate ("2017-08-18T09:47:23Z")

"configVersion": 3

"self": true

}

{

"_ id": 1

"name": "10.163.97.16 purl 27017"

"health": 1

"state": 2

"stateStr": "SECONDARY"

"uptime": 86

"optime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

"optimeDurable": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

OptimeDate: ISODate ("2017-08-18T09:49:15Z")

OptimeDurableDate: ISODate ("2017-08-18T09:49:15Z")

LastHeartbeat: ISODate ("2017-08-18T09:49:17.787Z")

LastHeartbeatRecv: ISODate ("2017-08-18T09:49:16.774Z")

"pingMs": NumberLong (0)

"syncingTo": "10.163.97.15 purl 27017"

"configVersion": 3

}

{

"_ id": 2

"name": "10.163.97.17 purl 27017"

"health": 1

"state": 2

"stateStr": "SECONDARY"

"uptime": 52

"optime": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

"optimeDurable": {

Ts: Timestamp (1503049755, 1)

"t": NumberLong (1)

}

OptimeDate: ISODate ("2017-08-18T09:49:15Z")

OptimeDurableDate: ISODate ("2017-08-18T09:49:15Z")

LastHeartbeat: ISODate ("2017-08-18T09:49:17.787Z")

LastHeartbeatRecv: ISODate ("2017-08-18T09:49:16.883Z")

"pingMs": NumberLong (0)

"syncingTo": "10.163.97.15 purl 27017"

"configVersion": 3

}

]

"ok": 1

}

4. Write test data

The primary node writes data:

Stoners:PRIMARY > use hr

Switched to db hr

Stoners:PRIMARY > db.emp.insert ({"num": 1})

WriteResult ({"nInserted": 1})

Stoners:PRIMARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

Directly query the replica node and report an error:

Stoners:SECONDARY > use hr

Switched to db hr

Stoners:SECONDARY > db.emp.find ()

Error: error: {

"ok": 0

"errmsg": "not master and slaveOk=false"

"code": 13435

"codeName": "NotMasterNoSlaveOk"

}

Set copy node to be readable:

Stoners:SECONDARY > db.getMongo (). SetSlaveOk ()

Stoners:SECONDARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

Another replica node:

Stoners:SECONDARY > db.getMongo (). SetSlaveOk ()

Stoners:SECONDARY > use hr

Switched to db hr

Stoners:SECONDARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

5. Test failover

Close the primary node first:

Stoners:PRIMARY > use admin

Switched to db admin

Stoners:PRIMARY > db.shutdownServer ()

Server should be down...

One of the replica nodes becomes the primary node:

Stoners:SECONDARY >

Stoners:PRIMARY >

Stoners:PRIMARY > rs.status ()

{

"set": "stoners"

Date: ISODate ("2017-08-18T10:03:49.050Z")

"myState": 1

"term": NumberLong (2)

"heartbeatIntervalMillis": NumberLong (2000)

"optimes": {

"lastCommittedOpTime": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

"appliedOpTime": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

"durableOpTime": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

}

"members": [

{

"_ id": 0

"name": "10.163.97.15 purl 27017"

"health": 0

"state": 8

"stateStr": "(not reachable/healthy)

"uptime": 0

"optime": {

"ts": Timestamp (0,0)

"t": NumberLong (- 1)

}

"optimeDurable": {

"ts": Timestamp (0,0)

"t": NumberLong (- 1)

}

OptimeDate: ISODate ("1970-01-01T00:00:00Z")

OptimeDurableDate: ISODate ("1970-01-01T00:00:00Z")

LastHeartbeat: ISODate ("2017-08-18T10:03:47.314Z")

LastHeartbeatRecv: ISODate ("2017-08-18T10:01:03.792Z")

"pingMs": NumberLong (0)

"lastHeartbeatMessage": "Connection refused"

"configVersion":-1

}

{

"_ id": 1

"name": "10.163.97.16 purl 27017"

"health": 1

"state": 1

"stateStr": "PRIMARY"

Uptime: 929

"optime": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

OptimeDate: ISODate ("2017-08-18T10:03:44Z")

ElectionTime: Timestamp (1503050473, 1)

ElectionDate: ISODate ("2017-08-18T10:01:13Z")

"configVersion": 3

"self": true

}

{

"_ id": 2

"name": "10.163.97.17 purl 27017"

"health": 1

"state": 2

"stateStr": "SECONDARY"

Uptime: 845

"optime": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

"optimeDurable": {

Ts: Timestamp (1503050624, 1)

"t": NumberLong (2)

}

OptimeDate: ISODate ("2017-08-18T10:03:44Z")

OptimeDurableDate: ISODate ("2017-08-18T10:03:44Z")

LastHeartbeat: ISODate ("2017-08-18T10:03:47.252Z")

LastHeartbeatRecv: ISODate ("2017-08-18T10:03:47.998Z")

"pingMs": NumberLong (0)

"syncingTo": "10.163.97.16 purl 27017"

"configVersion": 3

}

]

"ok": 1

}

Insert data on the primary node:

Stoners:PRIMARY > use hr

Switched to db hr

Stoners:PRIMARY > db.emp.insert ({"num": 2})

WriteResult ({"nInserted": 1})

Stoners:PRIMARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

{"_ id": ObjectId ("5996bbcb5945237d11f3052d"), "num": 2}

View in another replica node:

Stoners:SECONDARY > use hr

Switched to db hr

Stoners:SECONDARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

{"_ id": ObjectId ("5996bbcb5945237d11f3052d"), "num": 2}

Now start and shut down the node:

[root@D2-POMS15] # mongod-f / usr/local/mongodb/mongodb.conf

Automatically become a replica node after startup:

Stoners:SECONDARY > rs.status ()

{

"set": "stoners"

Date: ISODate ("2017-08-18T10:08:25.401Z")

"myState": 2

"term": NumberLong (2)

"syncingTo": "10.163.97.17 purl 27017"

"heartbeatIntervalMillis": NumberLong (2000)

"optimes": {

"lastCommittedOpTime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

"appliedOpTime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

"durableOpTime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

}

"members": [

{

"_ id": 0

"name": "10.163.97.15 purl 27017"

"health": 1

"state": 2

"stateStr": "SECONDARY"

"uptime": 49

"optime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

OptimeDate: ISODate ("2017-08-18T10:09:34Z")

"syncingTo": "10.163.97.17 purl 27017"

"configVersion": 3

"self": true

}

{

"_ id": 1

"name": "10.163.97.16 purl 27017"

"health": 1

"state": 1

"stateStr": "PRIMARY"

"uptime": 48

"optime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

"optimeDurable": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

OptimeDate: ISODate ("2017-08-18T10:09:34Z")

OptimeDurableDate: ISODate ("2017-08-18T10:09:34Z")

LastHeartbeat: ISODate ("2017-08-18T10:08:24.973Z")

LastHeartbeatRecv: ISODate ("2017-08-18T10:08:23.753Z")

"pingMs": NumberLong (0)

ElectionTime: Timestamp (1503050473, 1)

ElectionDate: ISODate ("2017-08-18T10:01:13Z")

"configVersion": 3

}

{

"_ id": 2

"name": "10.163.97.17 purl 27017"

"health": 1

"state": 2

"stateStr": "SECONDARY"

"uptime": 48

"optime": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

"optimeDurable": {

Ts: Timestamp (1503050974, 1)

"t": NumberLong (2)

}

OptimeDate: ISODate ("2017-08-18T10:09:34Z")

OptimeDurableDate: ISODate ("2017-08-18T10:09:34Z")

LastHeartbeat: ISODate ("2017-08-18T10:08:24.973Z")

LastHeartbeatRecv: ISODate ("2017-08-18T10:08:23.520Z")

"pingMs": NumberLong (0)

"syncingTo": "10.163.97.16 purl 27017"

"configVersion": 3

}

]

"ok": 1

}

The data is also synchronized.

Stoners:SECONDARY > db.getMongo (). SetSlaveOk ()

Stoners:SECONDARY > use hr

Switched to db hr

Stoners:SECONDARY > db.emp.find ()

{"_ id": ObjectId ("5996b96ca4ca3f4911a83ae8"), "num": 1}

{"_ id": ObjectId ("5996bbcb5945237d11f3052d"), "num": 2}

This is the answer to the question about how to implement the replica set in MongoDB. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel to learn more about it.

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