MongoDB replica set building and adding/Removing Machines

MongoDB replica set building and adding/Removing Machines

1. replica set

You must set the replica set name for each replica set.

This parameter is specified when MongoDB is started.

2. Setup steps

2.1 start

Start MongoDB first

Set to replica set mode and name at startup.

You can use either the configuration file or the command line mode.

Configuration file:

01. # mongodb. conf
02.
03. replSet = replsetname

Command Line Mode:

Mongod -- replSet "replsetname"

2.2 mongo shell

Open mongo shell

$./Bin/mongo

2.3 Initialization

Use rs. initiate () in mongo shell: initializes the replica set.

> Rs. initiate ():

2.4 Verification

Verify whether the initialization is successful.

> Rs. conf ();

The following result is returned.

01 .{
02. "_ id": "replsetname ",
03. "version": 1,
04. "members ":[
05 .{
06. "_ id": 1,
07. "host": "Maid: 27017"
08 .}
09.]
10 .}

2.5 add an instance

Use rs. add to add an instance

> Rs. add ("mongodb1.example.net ")

3. View replica set status

Run the following command to view

> Rs. status ()

Return the following information.

01 .{
02. "set": "replisetname ",
03. "date": ISODate ("2014-08-23T07: 43: 51Z "),
04. "myState": 2,
05. "members ":[
06 .{
07. "_ id": 0,
08. "name": "mongodb0.example.net: 2701 ",
09. "health": 1,
10. "state": 2,
11. "stateStr": "SECONDARY ",
12. "uptime": 3816405,
13. "optime": Timestamp (1408335342, 1 ),
14. "optimeDate": ISODate ("2014-08-18T04: 15: 42Z "),
15. "lastHeartbeat": ISODate ("2014-08-23T07: 43: 51Z "),
16. "lastHeartbeatRecv": ISODate ("2014-08-23T07: 43: 50Z "),
17. "pingMs": 1,
18 .},

4. delete a node

Delete use remove

Rs. remove ("mongod3.example.net: 27017 ")

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MongoDB beginners must read (both concepts and practices)

MongoDB authoritative Guide (The Definitive Guide) in English [PDF]

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