mongodbレプリケーションクラスタ
13000 ワード
Mongodbのレプリケーション機能:
Mongodbのレプリケーションアーキテクチャ:
Mongoのデータ同期タイプ:
マスターコピーオプション:
選挙メカニズム:
monレプリケーション実験の3ノード:
oplog
クラスタノードの削除のコピー
mongodbレプリケーションクラスタ:
：
master/slave：
replica set( ， )： mongodb
oplog ， mysql ， ，
arbiter： ， 2s ， ( )
：
0 ： ， ， ， ：
：( 0 )，
： 0 ，
arbiter:
# ： cfg=rs.conf()
arbiterOnly:true
priority:[0-1000]
hidden:true
buildIndexes:
tags:{loc1:desc1,....}
slaveDelay: #
votes:0 ，
Mongodbのレプリケーションアーキテクチャ:
oplog: mongodb local
oplog: mongodb local ，
：
1、 (initial sync)
2、 (post-rollback catch-up)
3、 (sharding chunk migrations)
local： oplog, oplog oplog.rs collection,
oplog.rs os ， ，--oplogSize
Mongoのデータ同期タイプ:
：
1、 collection
2、 ： oplog,
3、 collection
マスターコピーオプション:
--only: ( )
--slavedelay: ， ，( ，)，
--fastsync: ， ，
--autoresync: ，
--oplogSize: oplog ( MB)
：
--replSet NAME
--replIndexPrefetch {none|_id_only|all}
：
optime： ，
：
：
選挙メカニズム:
：
“ ”
stepDown()
，
monレプリケーション実験の3ノード:
192.168.2.147 node4
192.168.2.33 node3
192.168.3.6 node2
# ntpdate cn.ntp.org.cn
# scp *.rpm root@node3:/data/pkg
# scp *.rpm root@node4:/data/pkg
# yum install -y *.rpm
# mkdir -pv /data/mongodb
# chown -R mongod.mongod /data/mongodb
# vim /etc/mongod.conf
# dbpath=/data/mongodb
# #bind_ip=127.0.0.1
# replSet=mymongo
# scp /etc/mongod.conf root@node3:/etc/mongod.conf
# scp /etc/mongod.conf root@node4:/etc/mongod.conf
# service mongod start
# ，
#
# rs.status()
> rs.status()
{
"startupStatus" : 3,
"info" : "run rs.initiate(...) if not yet done for the set",
"ok" : 0,
"errmsg" : "can't get local.system.replset config from self or any seed (EMPTYCONFIG)"
}
#
> rs.initiate()
{
"info2" : "no configuration explicitly specified -- making one",
"me" : "node2:27017",
"info" : "Config now saved locally. Should come online in about a minute.",
"ok" : 1
}
# ， ：mymongo:PRIMARY>
# ：
mymongo:PRIMARY> rs.add("192.168.2.147:27017")
{ "ok" : 1 }
mymongo:PRIMARY> rs.add("192.168.2.33:27017")
{ "ok" : 1 }
#
mymongo:PRIMARY> rs.status()
{
"set" : "mymongo",
"date" : ISODate("2017-05-23T16:22:29Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "node2:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 1088,
"optime" : Timestamp(1495556519, 1),
"optimeDate" : ISODate("2017-05-23T16:21:59Z"),
"electionTime" : Timestamp(1495555526, 1),
"electionDate" : ISODate("2017-05-23T16:05:26Z"),
"self" : true
},
{
"_id" : 1,
"name" : "192.168.2.147:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 35,
"optime" : Timestamp(1495556519, 1),
"optimeDate" : ISODate("2017-05-23T16:21:59Z"),
"lastHeartbeat" : ISODate("2017-05-23T16:22:28Z"),
"lastHeartbeatRecv" : ISODate("2017-05-23T16:22:29Z"),
"pingMs" : 3,
"syncingTo" : "node2:27017"
},
{
"_id" : 2,
"name" : "192.168.2.33:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 30,
"optime" : Timestamp(1495556519, 1),
"optimeDate" : ISODate("2017-05-23T16:21:59Z"),
"lastHeartbeat" : ISODate("2017-05-23T16:22:29Z"),
"lastHeartbeatRecv" : ISODate("2017-05-23T16:22:28Z"),
"pingMs" : 0,
"syncingTo" : "node2:27017"
}
],
"ok" : 1
}
#
mymongo:PRIMARY> use testdb;
mymongo:PRIMARY> for(i=1;i<=100;i++) db.testcoll.insert({name:"user"+i,age:i,book:["book"+i,"apple"]})
WriteResult({ "nInserted" : 1 })
# ， ， ， ， slaveOk 。
mymongo:SECONDARY> rs.slaveOk()
mymongo:SECONDARY> db.testcoll.findOne()
{
"_id" : ObjectId("592462540c61503feddc0103"),
"name" : "user1",
"age" : 1,
"book" : [
"book1",
"apple"
]
}
# ，mongodb
# 。
mymongo:SECONDARY> rs.status()
{
"set" : "mymongo",
"date" : ISODate("2017-05-23T16:30:36Z"),
"myState" : 2,
"syncingTo" : "192.168.2.147:27017",
"members" : [
{
"_id" : 0,
"name" : "node2:27017",
"health" : 0,
"state" : 8,
"stateStr" : "(not reachable/healthy)", # ，
"uptime" : 0,
"optime" : Timestamp(1495556693, 6),
"optimeDate" : ISODate("2017-05-23T16:24:53Z"),
"lastHeartbeat" : ISODate("2017-05-23T16:30:35Z"),
"lastHeartbeatRecv" : ISODate("2017-05-23T16:30:13Z"),
"pingMs" : 0
},
{
"_id" : 1,
"name" : "192.168.2.147:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY", #node4
"uptime" : 516,
"optime" : Timestamp(1495556693, 6),
"optimeDate" : ISODate("2017-05-23T16:24:53Z"),
"lastHeartbeat" : ISODate("2017-05-23T16:30:34Z"),
"lastHeartbeatRecv" : ISODate("2017-05-23T16:30:35Z"),
"pingMs" : 0,
"electionTime" : Timestamp(1495556989, 1),
"electionDate" : ISODate("2017-05-23T16:29:49Z")
},
{
"_id" : 2,
"name" : "192.168.2.33:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 1565,
"optime" : Timestamp(1495556693, 6),
"optimeDate" : ISODate("2017-05-23T16:24:53Z"),
"infoMessage" : "syncing to: 192.168.2.147:27017",
"self" : true
}
],
"ok" : 1
}
# ， mongodb
mymongo:SECONDARY> db.isMaster()
{
"setName" : "mymongo",
"setVersion" : 3,
"ismaster" : false,
"secondary" : true,
"hosts" : [
"192.168.2.33:27017",
"192.168.2.147:27017",
"node2:27017"
],
"primary" : "192.168.2.147:27017", #master node4
"me" : "192.168.2.33:27017",
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 1000,
"localTime" : ISODate("2017-05-23T16:32:33.600Z"),
"maxWireVersion" : 2,
"minWireVersion" : 0,
"ok" : 1
}
# ， 。
# mongodb ， ， master 。
mymongo:PRIMARY> cfg=rs.conf()
{
"_id" : "mymongo",
"version" : 3,
"members" : [
{
"_id" : 0,
"host" : "node2:27017"
},
{
"_id" : 1,
"host" : "192.168.2.147:27017"
},
{
"_id" : 2,
"host" : "192.168.2.33:27017"
}
]
}
mymongo:PRIMARY> cfg.members[0].priority=2 # node2 2
2
mymongo:PRIMARY> rs.reconfig(cfg) # ，
2017-05-24T00:36:57.911+0800 DBClientCursor::init call() failed
2017-05-24T00:36:57.916+0800 trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed
2017-05-24T00:36:57.919+0800 reconnect 127.0.0.1:27017 (127.0.0.1) ok
2017-05-24T00:36:57.923+0800 DBClientCursor::init call() failed
2017-05-24T00:36:57.926+0800 Error: error doing query: failed at src/mongo/shell/query.js:81
2017-05-24T00:36:57.929+0800 trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed
2017-05-24T00:36:57.933+0800 reconnect 127.0.0.1:27017 (127.0.0.1) ok
mymongo:SECONDARY> #
oplog
mongodb ， oplog local ，oplog.rs
use local
mymongo:PRIMARY> show collections
me
oplog.rs
replset.minvalid
slaves
startup_log
system.indexes
system.replset
mymongo:PRIMARY> db.oplog.rs.findOne()
{
"ts" : Timestamp(1495555525, 1),
"h" : NumberLong(0),
"v" : 2,
"op" : "n",
"ns" : "",
"o" : {
"msg" : "initiating set"
}
}
# ts:
# op: ，insert,update,delete，
# ns:
# o: document ，
----- oplog -----
mymongo:PRIMARY> db.printReplicationInfo()
configured oplog size: 2311.57470703125MB
log length start to end: 1892secs (0.53hrs)
oplog first event time: Wed May 24 2017 00:05:25 GMT+0800 (CST)
oplog last event time: Wed May 24 2017 00:36:57 GMT+0800 (CST)
now: Wed May 24 2017 09:25:52 GMT+0800 (CST)
# configured oplog size:oplog
# log length start to end:oplog
# oplog first event time:
# oplog last event time:
# now:
----- slave oplog -----
mymongo:PRIMARY> db.printSlaveReplicationInfo()
source: 192.168.2.147:27017
syncedTo: Wed May 24 2017 00:36:57 GMT+0800 (CST)
0 secs (0 hrs) behind the primary
source: 192.168.2.33:27017
syncedTo: Wed May 24 2017 00:36:57 GMT+0800 (CST)
0 secs (0 hrs) behind the primary
# source: ip
# syncedTo:
----- -----
mymongo:PRIMARY> db.system.replset.findOne()
{
"_id" : "mymongo",
"version" : 4,
"members" : [
{
"_id" : 0,
"host" : "node2:27017",
"priority" : 2
},
{
"_id" : 1,
"host" : "192.168.2.147:27017"
},
{
"_id" : 2,
"host" : "192.168.2.33:27017"
}
]
}
クラスタノードの削除のコピー
：，
1、 oplog (oplog ， ， )
2、 +oplog
3、 0 ( rs.add )
#####
mongodb ， ，
scp -r /data/mongodb/{dbname}.* [email protected]:/data/mongodb
# ， DB ， local
new node1:
chown -R mongod.mongod /data/mongodb
service mongod start
# replset primary ：
rs.add("192.168.1.154:27017")
# ,rs.status() secondary 。
：
rs.remove("192.168.1.154")
# ， local
use local
db.slaves.find()
# ，
# rs.setpDown(N) #N
# ，( )
# rs.freeze(N) #N
# rs.freeze(0) #
mongodbレプリケーションクラスタ:
1、 ， ， ， slaveOk
2、 oplog ， ， ，
3、 oplog ，， oplog（ ）, oplog
4、 ， 。
5、 ， 。
6、 ，primary secondary 。
7、oplog ， oplog ，
8、64 ，oplog 5%