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系統(tǒng):centos6.5
IP:10.19.21.244 主節(jié)點(diǎn)
10.19.21.245 備節(jié)點(diǎn)
10.19.21.248 仲裁點(diǎn)
不只是主節(jié)點(diǎn)、副本節(jié)點(diǎn)、仲裁節(jié)點(diǎn),還有Secondary-Only、Hidden、Delayed、Non-Voting。
Secondary-Only:不能成為primary節(jié)點(diǎn),只能作為secondary副本節(jié)點(diǎn),防止一些性能不高的節(jié)點(diǎn)成為主節(jié)點(diǎn)。
Hidden:這類節(jié)點(diǎn)是不能夠被客戶端制定IP引用,也不能被設(shè)置為主節(jié)點(diǎn),但是可以投票,一般用于備份數(shù)據(jù)。
Delayed:可以指定一個(gè)時(shí)間延遲從primary節(jié)點(diǎn)同步數(shù)據(jù)。主要用于備份數(shù)據(jù),如果實(shí)時(shí)同步,誤刪除數(shù)據(jù)馬上同步到從節(jié)點(diǎn),恢復(fù)又恢復(fù)不了。
Non-Voting:沒有選舉權(quán)的secondary節(jié)點(diǎn),純粹的備份數(shù)據(jù)節(jié)點(diǎn)。
三臺(tái)主機(jī)安裝mongodb
下載mongodb wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.6.9.tgz 解壓到目錄 tar xf mongodb-linux-x86_64-2.6.9.tgz -C /usr/local/src 更改名 mv mongodb-linux-x86_64-2.6.9 /usr/local/mongodb cd /usr/local/mongodb/ 創(chuàng)建數(shù)據(jù)目錄和日志目錄 mkdir -p data log 創(chuàng)建用戶 useradd mongodb -s /sbin/nologin 更改目錄屬主屬組 chown mongod:mongodb /usr/local/mongodb -R 更改環(huán)境變量 vim ~/.bash_profile PATH=$PATH:/usr/local/mongodb/bin source ~/.bash_profile
配置文件 vim /etc/mongodb.conf port = 27017 fork = true logpath = /usr/local/mongodb/log/mongodb.log dbpath =/usr/local/mongodb/data/ journal = true #以目錄的形式存數(shù)據(jù),如果已經(jīng)存在,修改此配置會(huì)導(dǎo)致原始數(shù)據(jù)消失(注釋次參數(shù)會(huì)回來),除非遷移現(xiàn)有數(shù)據(jù)文件到directoryperdb所產(chǎn)生的數(shù)據(jù)目錄中。 directoryperdb=true #日志增加形式寫入 logappend=true #配置副本集,指定副本名稱作為參數(shù),所有主機(jī)都必須有相同名稱作為同一個(gè)副本集 replSet=testrs #使用預(yù)分配方式來保證寫入性能的穩(wěn)定,預(yù)分配在后臺(tái)進(jìn)行,并且每個(gè)預(yù)分配的文件都用0進(jìn)行填充。這會(huì)讓MongoDB始終保持額外的空間和空余的數(shù)據(jù)文件,從而避免了數(shù)據(jù)增長(zhǎng)過快而帶來的分配磁盤空間引起的阻塞。設(shè)置noprealloc= true來禁用預(yù)分配的數(shù)據(jù)文件,會(huì)縮短啟動(dòng)時(shí)間,但在正常操作過程中,可能會(huì)導(dǎo)致性能顯著下降。 noprealloc=true
啟動(dòng)服務(wù) mongod -f /etc/mongodb.conf
首先連接主節(jié)點(diǎn) mongo > use admin > conf = {_id:"testrs",members:[{_id:0,host:"10.19.21.244:27017",priority:2},{_id:1,host:"10.19.21.245:27017",priority:1},{_id:2,host:"10.19.21.248:27017",arbiterOnly:true}]}; { "_id" : "testrs", "version" : 1, "members" : [ { "_id" : 0, "host" : "10.19.21.244:27017", "priority" : 2 }, { "_id" : 1, "host" : "10.19.21.245:27017" }, { "_id" : 2, "host" : "10.19.21.248:27017", "arbiterOnly" : true } ] } 注意最初的_id的值就是我們配置文件中設(shè)定的replSet的值,arbiterOnly是大寫的O,配置完成后進(jìn)行初始化: > rs.initiate(conf) { "info" : "Config now saved locally. Should come online in about a minute.", "ok" : 1 } 此步驟必須備節(jié)點(diǎn)和仲裁節(jié)點(diǎn)的mongo啟動(dòng),不然無法執(zhí)行此步驟。
> rs.status() { "set" : "testrs", "date" : ISODate("2015-05-07T11:55:17Z"), "myState" : 1, "members" : [ { "_id" : 0, "name" : "10.19.21.244:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 5737, "optime" : Timestamp(1430995665, 1), "optimeDate" : ISODate("2015-05-07T10:47:45Z"), "electionTime" : Timestamp(1430993992, 1), "electionDate" : ISODate("2015-05-07T10:19:52Z"), "self" : true }, { "_id" : 1, "name" : "10.19.21.245:27017", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 3077, "optime" : Timestamp(1430995665, 1), "optimeDate" : ISODate("2015-05-07T10:47:45Z"), "lastHeartbeat" : ISODate("2015-05-07T11:55:17Z"), "lastHeartbeatRecv" : ISODate("2015-05-07T11:55:17Z"), "pingMs" : 0, "syncingTo" : "10.19.21.244:27017" }, { "_id" : 2, "name" : "10.19.21.248:27017", "health" : 1, "state" : 7, "stateStr" : "ARBITER", "uptime" : 5735, "lastHeartbeat" : ISODate("2015-05-07T11:55:17Z"), "lastHeartbeatRecv" : ISODate("2015-05-07T11:55:17Z"), "pingMs" : 0 } ], "ok" : 1 }
> use test 插入數(shù)據(jù) > db.testdb.insert({"tset1":"i'm master"})
然后到備份節(jié)點(diǎn)查看數(shù)據(jù)是否有 mongo 10.19.21.245 testrs:SECONDARY> use test switched to db test testrs:SECONDARY> show tables; 2015-05-07T19:57:29.670+0800 error: { "$err" : "not master and slaveOk=false", "code" : 13435 } at src/mongo/shell/query.js:131 需要進(jìn)行配置 testrs:SECONDARY> db.setSlaveOk() testrs:SECONDARY> show tables; system.indexes testdb testrs:SECONDARY> db.testdb.find() { "_id" : ObjectId("554a4ee4eb804a0f1b6ec347"), "test1" : "i'm master" }
停止主節(jié)點(diǎn),查看整個(gè)集群狀態(tài) testrs:PRIMARY> rs.status() { "set" : "testrs", "date" : ISODate("2015-05-07T11:59:42Z"), "myState" : 1, "members" : [ { "_id" : 0, "name" : "10.19.21.244:27017", "health" : 0, "state" : 8, "stateStr" : "(not reachable/healthy)", "uptime" : 0, "optime" : Timestamp(1430995665, 1), "optimeDate" : ISODate("2015-05-07T10:47:45Z"), "lastHeartbeat" : ISODate("2015-05-07T11:59:40Z"), "lastHeartbeatRecv" : ISODate("2015-05-07T11:59:32Z"), "pingMs" : 0 }, { "_id" : 1, "name" : "10.19.21.245:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 3342, "optime" : Timestamp(1430995665, 1), "optimeDate" : ISODate("2015-05-07T10:47:45Z"), "electionTime" : Timestamp(1430999976, 1), "electionDate" : ISODate("2015-05-07T11:59:36Z"), "self" : true }, { "_id" : 2, "name" : "10.19.21.248:27017", "health" : 1, "state" : 7, "stateStr" : "ARBITER", "uptime" : 3340, "lastHeartbeat" : ISODate("2015-05-07T11:59:42Z"), "lastHeartbeatRecv" : ISODate("2015-05-07T11:59:41Z"), "pingMs" : 0 } ], "ok" : 1 }
主節(jié)點(diǎn)已切換過來,此時(shí)備節(jié)點(diǎn)已經(jīng)變成了主節(jié)點(diǎn)。再插入一條數(shù)據(jù) testrs:PRIMARY> db.testdb.insert({"test2":"i'm new master"}) testrs:PRIMARY> db.testdb.find(); { "_id" : ObjectId("554a4ee4eb804a0f1b6ec347"), "test1" : "i'm master" } { "_id" : ObjectId("554a505d494f70c600422b41"), "test2" : "i'm new master" }
重啟原來的主節(jié)點(diǎn)查看狀態(tài) testrs:SECONDARY> rs.status() { "set" : "testrs", "date" : ISODate("2015-05-07T14:00:33Z"), "myState" : 1, "members" : [ { "_id" : 0, "name" : "10.19.21.244:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 15, "optime" : Timestamp(1430995665, 1), "optimeDate" : ISODate("2015-05-07T10:47:45Z"), "electionTime" : Timestamp(1431007222, 1), "electionDate" : ISODate("2015-05-07T14:00:22Z"), "self" : true }, { "_id" : 1, "name" : "10.19.21.245:27017", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 13, "optime" : Timestamp(1430995665, 1), "optimeDate" : ISODate("2015-05-07T10:47:45Z"), "lastHeartbeat" : ISODate("2015-05-07T14:00:32Z"), "lastHeartbeatRecv" : ISODate("2015-05-07T14:00:33Z"), "pingMs" : 0, "lastHeartbeatMessage" : "syncing to: 10.19.21.244:27017", "syncingTo" : "10.19.21.244:27017" }, { "_id" : 2, "name" : "10.19.21.248:27017", "health" : 1, "state" : 7, "stateStr" : "ARBITER", "uptime" : 13, "lastHeartbeat" : ISODate("2015-05-07T14:00:32Z"), "lastHeartbeatRecv" : ISODate("2015-05-07T14:00:33Z"), "pingMs" : 0 } ], "ok" : 1 }
查看數(shù)據(jù)是否同步過來 testrs:PRIMARY> use test switched to db test testrs:PRIMARY> db.testdb.find() { "_id" : ObjectId("554a4ee4eb804a0f1b6ec347"), "test1" : "i'm master" } { "_id" : ObjectId("554a505d494f70c600422b41"), "test2" : "i'm new master" }
向集群中增加節(jié)點(diǎn) cfg = rs.conf() cfg.members[3] = {_id:3,host:"10.19.21.246:27017",priority:0.5} rs.reconfig(cfg) 如果備份節(jié)點(diǎn)無法讀取數(shù)據(jù),需要設(shè)置db.setSlaveOK()。如果備份節(jié)點(diǎn)可讀但不可寫,修改優(yōu)先級(jí) cfg = rs.conf() cfg.members[0].priority = 0.5 cfg.members[1].priority = 2 cfg.members[2].priority = 2 rs.reconfig(cfg) 需要 reconfig后配置才能生效。
php與mongodb連接 <?php $options = array( 'replicaSet' => 'testrs', 'readPreference' => 'secondaryPreferred', ); $m = new MongoClient("mongodb://10.19.21.244:27017,10.19.21.245:27017/", $options); foreach ( $m->getConnections() as $c ) { echo $c['hash'], ":\n", " - {$c['connection']['connection_type_desc']}, ", "{$c['connection']['ping_ms']} ms\n"; } ?>
primary:默認(rèn)參數(shù),只從主節(jié)點(diǎn)上進(jìn)行讀取操作;
primaryPreferred:大部分從主節(jié)點(diǎn)上讀取數(shù)據(jù),只有主節(jié)點(diǎn)不可用時(shí)從secondary節(jié)點(diǎn)讀取數(shù)據(jù)。
secondary:只從secondary節(jié)點(diǎn)上進(jìn)行讀取操作,存在的問題是secondary節(jié)點(diǎn)的數(shù)據(jù)會(huì)比primary節(jié)點(diǎn)數(shù)據(jù)“舊”。
secondaryPreferred:優(yōu)先從secondary節(jié)點(diǎn)進(jìn)行讀取操作,secondary節(jié)點(diǎn)不可用時(shí)從主節(jié)點(diǎn)讀取數(shù)據(jù);
nearest:不管是主節(jié)點(diǎn)、secondary節(jié)點(diǎn),從網(wǎng)絡(luò)延遲最低的節(jié)點(diǎn)上讀取數(shù)據(jù)。
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