mongodb主从复制及副本集的部署
一.mongodb配置参数介绍:# cat/etc/mongod.conf
#以守护进程的方式运行
fork=true
#设置db的路径
dbpath=/usr/local/mongodb/data/db
#设置日志路径
logpath=/usr/local/mongodb/data/log/mongod.log
#logappend：写日志的模式：设置为true为追加。默认是覆盖。如果未指定此设置，启动时MongoDB的将覆盖现有的日志文件。
logappend=true
#设置端口号
port=27017
#在服务的端口号加上1000的端口上启动一个web服务器
rest=true
#打开权限控制体系
#auth=true
二.部署mongodb主从复制:
1.创建master和slave的配置文件:
# cat /etc/mongod_master.conf
logpath=/usr/local/mongodb/data/log/mongod_master.log
logappend=true
fork=true
dbpath=/usr/local/mongodb/data/master
port=10000
rest=true
master=true
#auth=true
#slaveok=true
#
# cat /etc/mongod_slave.conf
logpath=/usr/local/mongodb/data/log/mongod_slave.log
logappend=true
fork=true
dbpath=/usr/local/mongodb/data/slave
port=10001
rest=true
slave=true
#auth=true
source=127.0.0.1:10000
2.启动主从进程;
#mkdir -pv /usr/local/mongodb/data/master
#mkdir -pv /usr/local/mongodb/data/slave
mongod -f /etc/mongod_master.conf
mongod -f /etc/mongod_slave.conf
3.检查主从状态:
# mongo localhost:10000
> db.isMaster();
{
"ismaster" : true,
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 1000,
"localTime" : ISODate("2016-02-28T11:46:54.199Z"),
"maxWireVersion" : 4,
"minWireVersion" : 0,
"ok" : 1
}
>
> db.printReplicationInfo();
configured oplog> log length start to end: 23821secs (6.62hrs)
oplog first event time:Sun Feb 28 2016 13:05:17 GMT+0800 (CST)
oplog last event time: Sun Feb 28 2016 19:42:18 GMT+0800 (CST)
now: Sun Feb 28 2016 19:42:20 GMT+0800 (CST)
> db.printSlaveReplicationInfo();
local.sources is empty; is this db a --slave?
> db.getReplicationInfo();
{
"logSizeMB" : 990,
"usedMB" : 0.14,
"timeDiff" : 23871,
"timeDiffHours" : 6.63,
"tFirst" : "Sun Feb 28 2016 13:05:17 GMT+0800 (CST)",
"tLast" : "Sun Feb 28 2016 19:43:08 GMT+0800 (CST)",
"now" : "Sun Feb 28 2016 19:43:18 GMT+0800 (CST)"
}
# mongo localhost:10001
> db.printReplicationInfo();
this is a slave, printing slave replication info.
source: 127.0.0.1:10000
syncedTo: Sun Feb 28 2016 19:44:18 GMT+0800 (CST)
4 secs (0 hrs) behind the freshest member (no primary available at the moment)
三.副本集的部署:
1.创建各node节点的配置文件:
# cat /etc/mongod_node1.conf
logpath=/usr/local/mongodb/data/log/mongod_node1.log
logappend=true
fork=true
dbpath=/usr/local/mongodb/data/node1
port=20001
rest=true
#auth=true
#slaveok=true
replSet=myrepl
# cat /etc/mongod_node2.conf
logpath=/usr/local/mongodb/data/log/mongod_node2.log
logappend=true
fork=true
dbpath=/usr/local/mongodb/data/node2
port=20002
rest=true
#auth=true
#slaveok=true
replSet=myrepl
# cat /etc/mongod_node3.conf
logpath=/usr/local/mongodb/data/log/mongod_node3.log
logappend=true
fork=true
dbpath=/usr/local/mongodb/data/node3
port=20003
rest=true
#auth=true
#slaveok=true
replSet=myrepl
#
2.配置并启动各node服务;
#mkdir -pv /usr/local/mongodb/data/node1
#mkdir -pv /usr/local/mongodb/data/node2
#mkdir -pv /usr/local/mongodb/data/node3
#mongod -f /etc/mongod_node1.conf
#mongod -f /etc/mongod_node2.conf
#mongod -f /etc/mongod_node2.conf
登录mongod:
#设置副本集变量:
> config = { _id:"myrepl", members:[{_id:0,host:"127.0.0.1:20001"},{_id:1,host:"127.0.0.1:20002"},{_id:2,host:"127.0.0.1:20003"}]};
#初始化副本集配置
> rs.initiate(config);
3.检查各node节点状态;
#查看副本集的状态
> rs.status();
#删除节点:
rs.remove("127.0.0.1:20001");
rs.status();
#添加节点:
rs.add("127.0.0.1:20001");
rs.status();
四.至此mongo主从及副本集群部署完成;
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