High throughput
Increase
availability
Maintain copies of
data like one in DR , one for reporting
Replica set members:
primary , secondary
|
|
|
|
|
|
|
C:\Program
Files\MongoDB 2.6 Standard\bin>mongod --dbpath C:\data\rs1 --port 27017
--replset rs101 --smallfiles -
oplogsize 16
|
|
|
|
|
|
C:\Program
Files\MongoDB 2.6 Standard\bin>mongod --dbpath C:\data\rs2 --port 27018
--replSet rs101 --smallfiles -
oplogsize 16
|
|
|
|
|
|
C:\>mongo --port
27017
> var myconf
={_id:"rs101", members:[{_id:0,host:"localhost:27017"}]}
> myconf
{
"_id" : "rs101",
"members" : [
{
"_id" : 0,
"host" :
"localhost:27017"
}
]
}
>
>
rs.initiate(myconf)
{
"info" : "Config now
saved locally. Should come online in
about a minute.",
"ok" : 1
}
rs101:OTHER>
rs101:PRIMARY>
rs101:PRIMARY>
rs.status()
{
"set" : "rs101",
"date" :
ISODate("2015-06-30T11:19:19Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" :
"localhost:27017",
"health" : 1,
"state" : 1,
"stateStr" :
"PRIMARY",
"uptime" :
598,
"optime" :
Timestamp(1435663092, 1),
"optimeDate"
: ISODate("2015-06-30T11:18:12Z"),
"electionTime" : Timestamp(1435663092, 2),
"electionDate" : ISODate("2015-06-30T11:18:12Z"),
"self" : true
}
],
"ok" : 1
}
rs101:PRIMARY>
rs.add("localhost:27018")
{ "ok" : 1
}
rs101:PRIMARY>
rs101:PRIMARY>
rs.status()
{
"set" : "rs101",
"date" :
ISODate("2015-06-30T11:22:00Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" :
"localhost:27017",
"health" : 1,
"state" : 1,
"stateStr" :
"PRIMARY",
"uptime" :
759,
"optime" :
Timestamp(1435663208, 1),
"optimeDate"
: ISODate("2015-06-30T11:20:08Z"),
"electionTime" : Timestamp(1435663092, 2),
"electionDate" : ISODate("2015-06-30T11:18:12Z"),
"self" : true
},
{
"_id" : 1,
"name" :
"localhost:27018",
"health" : 1,
"state" : 2,
"stateStr" :
"SECONDARY",
"uptime" :
112,
"optime" :
Timestamp(1435663208, 1),
"optimeDate"
: ISODate("2015-06-30T11:20:08Z"),
"lastHeartbeat" : ISODate("2015-06-30T11:22:00Z"),
"lastHeartbeatRecv" :
ISODate("2015-06-30T11:21:59Z"),
"pingMs" : 0,
"syncingTo" :
"localhost:27017"
}
],
"ok" : 1
}
rs101:PRIMARY>
C:\>mongo --port
27018
MongoDB shell
version: 2.6.5
connecting to:
127.0.0.1:27018/test
Server has startup
warnings:
2015-06-30T16:42:50.272+0530
[initandlisten]
2015-06-30T16:42:50.272+0530
[initandlisten] ** NOTE: This is a 32 bit MongoDB binary.
2015-06-30T16:42:50.272+0530
[initandlisten] ** 32 bit builds
are limited to less than 2GB of data (or less
with --journal).
2015-06-30T16:42:50.272+0530
[initandlisten] ** Note that
journaling defaults to off for 32 bit and is curr
ntly off.
2015-06-30T16:42:50.272+0530
[initandlisten] ** See http://dochub.mongodb.org/core/32bit
2015-06-30T16:42:50.288+0530
[initandlisten]
rs101:SECONDARY>
rs101:PRIMARY>
show dbs
admin (empty)
local 0.063GB
rs101:PRIMARY>
use mydb
switched to db mydb
rs101:PRIMARY>
db.createCollection("rstable")
{ "ok" : 1
}
rs101:PRIMARY>
rs101:SECONDARY>
show dbs
admin (empty)
local 0.063GB
mydb 0.031GB
rs101:SECONDARY>
show collections
2015-06-30T16:57:15.761+0530
error: { "$err" : "not master and slaveOk=false",
"code" : 13435 } at src/mongo/shel
/query.js:131
rs101:SECONDARY>
Mongo doesn’t allow
read /write from secondary by default
