ttlsa教程系列之mongodb——(五)mongodb架构-复制原理复制集

> db.oplog.rs.stats()
{
        "ns" : "local.oplog.rs",
        "count" : 7276573,
        "size" : 1980730564,
        "avgObjSize" : 272.20651314842854,
        "storageSize" : 2097156096,
        "numExtents" : 1,
        "nindexes" : 0,
        "lastExtentSize" : 2097156096,
        "paddingFactor" : 1,
        "systemFlags" : 0,
        "userFlags" : 0,
        "totalIndexSize" : 0,
        "indexSizes" : {

        },
        "capped" : true,
        "max" : 2147483647,
        "ok" : 1
}

> db.oplog.rs.find().limit(1).toArray()
[
        {
                "ts" : Timestamp(1357529944000, 1),
                "h" : NumberLong("-3237467944396345731"),
                "v" : 2,
                "op" : "i",
                "ns" : "ttlsa_event.ttlsa_events",
                "o" : {
                        "_id" : ObjectId("50ea43599ca66a2d7e000000"),
                        "aid" : 110000,
                        "kid" : 10007,
                        "tag" : "Mobile",
                        "uid" : 368514901,
                        "stmp" : 1357529945,
                        "born" : 1357529945,
                        "total" : 1,
                        "val" : [
                                {
                                        "nickname" : "m44332148",
                                        "productid" : 109350,
                                        "product" : "三国时代OL",
                                        "stmp" : 1357529945
                                }
                        ]
                }
        }
]

# mongod --master

# mongod --slave --source master_server:27017

> db.printReplicationInfo()
configured oplog size: 2000MB
log length start to end: 16685504secs (4634.86hrs)
oplog first event time: Mon Jan 07 2013 11:42:50 GMT+0800 (CST)
oplog last event time: Fri Jul 19 2013 14:34:34 GMT+0800 (CST)
now: Fri Jul 19 2013 14:34:38 GMT+0800 (CST)

> db.printSlaveReplicationInfo()
source:   10.1.11.157:27017
         no replication info, yet.  State: ARBITER
source:   10.1.11.156:27017
         syncedTo: Fri Jul 19 2013 14:34:42 GMT+0800 (CST)
                 = 2 secs ago (0hrs)

ttlsa:PRIMARY> rs.add("10.1.11.111:27017")

ttlsa:PRIMARY> rs.remove("10.1.11.111:27017")

ttlsa:SECONDARY> db.getMongo().setSlaveOK()

ttlsa:SECONDARY> rs.freeze([secs]) //make a node ineligible to become primary for the time specified 
ttlsa:PRIMARY> rs.stepDown([secs]) //step down as primary (momentarily) (disconnects)

> use local
> db.addUser("repl","password")