replication set復(fù)制集

replication set復(fù)制集
replicattion set 多臺(tái)服務(wù)器維護(hù)相同的數(shù)據(jù)副本,提高服務(wù)器的可用性.

Replication set 設(shè)置全過程
0:創(chuàng)建目錄
mkdir -p /data/r0 /data/r1 /data/r2

1:啟動(dòng)3個(gè)實(shí)例,且聲明實(shí)例屬于某復(fù)制集
./bin/mongod --port 27017 --dbpath /data/r0 --smallfiles --replSet rsa --fork --logpath /var/log/mongo17.log
./bin/mongod --port 27018 --dbpath /data/r1 --smallfiles --replSet rsa --fork --logpath /var/log/mongo18.log
./bin/mongod --port 27019 --dbpath /data/r2 --smallfiles --replSet rsa --fork --logpath /var/log/mongo19.log

2:配置
rsconf = {
_id:'rsa',
members:
[
{_id:0,
host:'192.168.1.201:27017'
}
]
}

3: 根據(jù)配置做初始化
rs.initiate(rsconf);

4: 添加節(jié)點(diǎn)
rs.add('192.168.1.201:27018');
rs.add('192.168.1.201:27019');

5:查看狀態(tài)
rs.status();

6:刪除節(jié)點(diǎn)
rs.remove('192.168.1.201:27019');

7:主節(jié)點(diǎn)插入數(shù)據(jù)

use test
db.user.insert({uid:1,name:'lily'});

8:連接secondary查詢同步情況
./bin/mongo --port 27019

use test
show tables

rsa:SECONDARY> show tables;
Sat Aug 17 16:03:55.786 JavaScript execution failed: error: { "$err" : "not master and slaveOk=false", "code" : 13435 }

8.1 出現(xiàn)上述錯(cuò)誤,是因?yàn)閟lave默認(rèn)不許讀寫

rs.slaveOk();
show tables

#看到與primary 一致的數(shù)據(jù)