MongDB Replica Set

原创于 2020-06-03 20:15:14 发布 · 176 阅读

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#mongodb

本文详细介绍了在CentOS 6.7环境下，使用MongoDB 3.0.5版本搭建包含主节点、从节点和仲裁节点的MongoDB副本集的过程。涵盖了关闭防火墙、配置文件编辑、数据文件夹建立、日志路径设定、主从仲裁节点配置及启动等关键步骤。

MongDB Replica Set

测试环境

os：centos 6.7

MongoDB：mongodb-linux-x86_64-3.0.5.tgz

ip地址：192.168.59.215 （主）

192.168.59.217 （备）

192.168.59.218 （仲裁）

分别在各台服务器关闭防火墙和slinux

[root@feng ~]# setenforce 0
[root@feng ~]# service iptables stop
iptables：将链设置为政策 ACCEPT：filter                    [确定]
iptables：清除防火墙规则：                                 [确定]
iptables：正在卸载模块：                                   [确定]

分别在每台服务器解压缩MongoDB包

[root@feng ~]# tar zxf mongodb-linux-x86_64-3.0.5.tgz 
[root@feng ~]# mv mongodb-linux-x86_64-3.0.5 /usr/local/mongodb
[root@feng ~]# cd /usr/local/mongodb/
[root@feng mongodb]# ls
bin  GNU-AGPL-3.0  README  THIRD-PARTY-NOTICES

建立数据文件夹

[root@feng ~]# mkdir -p /data/mongodb/master	#主节点
[root@feng ~]# mkdir -p /data/mongodb/slaver	#从节点
[root@feng ~]# mkdir -p /data/mongodb/arbiter	#仲裁节点

分别在服务器中建立配置文件

[root@feng ~]# cd /usr/local/mongodb 
[root@feng ~]# mkdir conf              #创建配置文件目录
[root@feng ~]#mkdir /data/mongodb/logs #创建日志路径

主配置文件

[root@feng ~]# vim /usr/local/mongodb/conf/master.conf			
dbpath=/data/mongodb/master     #数据存放路径        
logpath=/data/mongodb/logs/master.log  #日志存放路径
pidfilepath=/data/mongodb/master.pid   #进程文件 方便停止mongdb
directoryperdb=true      #为每一个数据库按照数据库名建立文件夹存放
logappend=true     #以追加的方式记录日志    
replSet=ytk        #replica set的名字
port=27017         #进程所使用的端口号，默认为27017
oplogSize=10000    #操作日志文件的最大大小
fork=true          #以后台方式运行进程

从配置文件

[root@feng ~]# vim /usr/local/mongodb/conf/slaver.conf 
dbpath=/data/mongodb/slaver
logpath=/data/mongodb/logs/slaver.log
pidfilepath=/data/mongodb/slaver.pid
directoryperdb=true
logappend=true
replSet=ytk
port=27017
oplogSize=10000
fork=true
noprealloc=true   #不预先分配存储

仲裁配置文件

[root@feng ~]# vim /usr/local/mongodb/conf/arbiter.conf 			
dbpath=/data/mongodb/arbiter
logpath=/data/mongodb/logs/arbiter.log
pidfilepath=/data/mongodb/arbiter.pid
directoryperdb=true
logappend=true
replSet=ytk
port=27018
oplogSize=10000
fork=true
noprealloc=true

分别启动主从仲裁的结点

#主
[root@192 logs]# /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/conf/master.conf
about to fork child process, waiting until server is ready for connections.
forked process: 3372
child process started successfully, parent exiting
#从
[root@feng conf]# /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/conf/slaver.conf 
note: noprealloc may hurt performance in many applications
about to fork child process, waiting until server is ready for connections.
forked process: 10321
child process started successfully, parent exiting
#仲裁
[root@feng conf]# /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/conf/arbiter.conf
note: noprealloc may hurt performance in many applications
about to fork child process, waiting until server is ready for connections.
forked process: 10312
child process started successfully, parent exiting

配置主从仲裁结点

编辑用户HOME目录下的.bash_profile配置文件，添加如下内容：

[root@192 ~]# cat .bash_profile 
# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
	. ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin:/usr/local/mongodb/bin

export PATH
[root@192 ~]# source .bash_profile
在主节点中执行如下操作：
[root@192 ~]# mongo
> use admin
switched to db admin
> cfg={_id:"ytk",members:}
2020-06-04T02:12:27.788+0800 E QUERY    SyntaxError: Unexpected token }
> cfg={_id:"ytk",members: [ {_id:0,host:'192.168.59.215:27017',priority:2}, {_id:1,host:'192.168.59.217:27017',priority:1}, {_id:2,host:'192.168.59.218:27018',arbiterOnly:true}]};
#使配置文件刷新
> rs.initiate(cfg)
{ "ok" : 1 }
#查看状态
ytk:OTHER> rs.status()
····
{ "ok" : 1 }
····
ytk:PRIMARY> db.printReplicationInfo()    #查看Replication信息
configured oplog size:   10000.003845214844MB
log length start to end: 0secs (0hrs)     
oplog first event time:  Thu Jun 04 2020 02:14:03 GMT+0800 (CST)
oplog last event time:   Thu Jun 04 2020 02:14:03 GMT+0800 (CST)
now:                     Thu Jun 04 2020 02:15:39 GMT+0800 (CST)
ytk:PRIMARY> db.printSlaveReplicationInfo()   #查看备节点Replication信息
source: 192.168.59.217:27017
	syncedTo: Thu Jun 04 2020 02:14:03 GMT+0800 (CST)
	0 secs (0 hrs) behind the primary 
ytk:PRIMARY> exit
bye