MongoDB Replica Set Configuration

Environment:

192.168.99.129 Master
192.168.99.130 slave1

1. Configuring Replication Sets

Execute separately on both servers

" Rs0 "

To execute the MONGO command, first add a

rs.initiate ({   "rs0",   0"master:27017 " } ]})

and add another one.

Rs.add ("slave1")

Execute Rs.status () to view the status of the replica set node

Rs0:primary>Rs.status () {"Set":"Rs0",    "Date": Isodate ("2017-01-01t05:08:29.623z"),    "MyState":1,    " Term": Numberlong (3),    "Heartbeatintervalmillis": Numberlong ( -),    "Optimes" : {        "Lastcommittedoptime" : {            "TS": Timestamp (1483247303,1),            "T": Numberlong (3)        },        "Appliedoptime" : {            "TS": Timestamp (1483247303,1),            "T": Numberlong (3)        },        "Durableoptime" : {            "TS": Timestamp (1483247303,1),            "T": Numberlong (3)        }    },    " Members" : [        {            "_id":0,            "name":"master:27017",            " Health":1,            " State":1,            "Statestr":"PRIMARY",            "Uptime": -,            "Optime" : {                "TS": Timestamp (1483247303,1),                "T": Numberlong (3)            },            "optimedate": Isodate ("2017-01-01t05:08:23z"),            "InfoMessage":"could not find member to sync from",            "Electiontime": Timestamp (1483247282,1),            "electiondate": Isodate ("2017-01-01t05:08:02z"),            "ConfigVersion":2,            " Self":true        },        {            "_id":1,            "name":"slave1:27017",            " Health":1,            " State":2,            "Statestr":"Secondary",            "Uptime": -,            "Optime" : {                "TS": Timestamp (1483247303,1),                "T": Numberlong (3)            },            "optimedurable" : {                "TS": Timestamp (1483247303,1),                "T": Numberlong (3)            },            "optimedate": Isodate ("2017-01-01t05:08:23z"),            "optimedurabledate": Isodate ("2017-01-01t05:08:23z"),            "lastheartbeat": Isodate ("2017-01-01t05:08:29.007z"),            "Lastheartbeatrecv": Isodate ("2017-01-01t05:08:27.902z"),            "Pingms": Numberlong (0),            "syncingto":"master:27017",            "ConfigVersion":2        }    ],    "OK":1}

2. Verifying Replication Sets

After the primary node inserts data, see if there is the same data from the node, but throw a wrong query from the node when querying the database instructions

Rs0:secondary>Show DBS .- A-31T20: the:59.362-0800E QUERY [main] error:listdatabases failed:{"OK":0,    "errmsg":"Not Master and Slaveok=false",    "Code":13435,    "codename":"Notmasternoslaveok"} :

Since the default from the node is not allowed to read and write, to solve this problem, there are two ways

Executing Rs.slaveok () on the slave node

or execute Db.getmongo () on the master node. Setslaveok ()

Inserting data on the master node

Rs0:primary> Db.student.insert ({"name":"xiaoming"}) Writeresult ({"ninserted":1}) Rs0:primary> Db.student.Find(){ "_id": ObjectId ("58688fa863a36c070316cd69"),"name":"xiaoming"}

Querying from a node

Rs0:secondary> db.student. Find  "_id" : ObjectId ("58688fa863a36c070316cd69""  name""xiaoming" }

MongoDB Replica Set Configuration