MongoDB副本集搭建

本次在一台服务器上搭建，根据端口区分不同进程。架构为一主两从，其中一个从节点为投票节点。

IP	端口	角色
10.238.162.33	27017	PRIMARY
10.238.162.33	27018	SECONDARY
10.238.162.33	27019	ARBITER

实验环境为CentOS 7.5

[root@localhost ~]# cat /etc/redhat-release 
CentOS Linux release 7.5.1804 (Core) 

安装MongoDB 

MongoDB官网下载安装包 
3.6.8版本
wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel62-3.6.8.tgz
3.4.18版本
wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel62-3.4.18.tgz

解压
tar zxf mongodb-linux-x86_64-rhel62-3.4.18.tgz

移动至/usr/local/mongodb 下
mv mongodb-linux-x86_64-rhel62-3.4.18 /usr/local/mongodb

设置环境变量并生效
echo 'export PATH=$PATH:/usr/local/mongodb/bin'>> /etc/profile
source /etc/profile

添加用户和组
groupadd mongo
useradd -g mongo mongo

创建三个节点的相关目录并修改权限

mkdir -p /data/mongodb27017/log/
mkdir -p /data/mongodb27018/log/
mkdir -p /data/mongodb27019/log/
chown -R mongo.mongo /data/

配置文件模板，只有端口号不同

#SERVER
fork = true
port = 27017
quiet = true 
dbpath = /data/mongodb27017/
logpath = /data/mongodb27017/log/mongod.log
logappend = true
journal = true
#auth = true   #开启认证 
# <=3.4
nohttpinterface = true
directoryperdb = true

#SLOW_LOG
profile = 1
slowms = 500

#RS
replSet = rs01
oplogSize = 4096

# add for 3.4
# shardsvr = true

#SCO
#cinfigsvr = true
#configdb = MSCHOST

#USER
#keyFile=/
#setParameter=enableLocalhostAuthBypass=1
storageEngine=wiredTiger
wiredTigerCacheSizeGB=1
wiredTigerCollectionBlockCompressor=snappy

#mongo_version=mongodb34

启动进程

sudo -u mongo /usr/local/mongodb/bin/mongod -f /data/mongodb27017/mongodb27017.cnf
sudo -u mongo /usr/local/mongodb/bin/mongod -f /data/mongodb27018/mongodb27018.cnf
sudo -u mongo /usr/local/mongodb/bin/mongod -f /data/mongodb27019/mongodb27019.cnf

初始化

进入到MongoDB命令行
# mongo 10.238.162.33:27017

设置变量
cfg={_id:'rs01',version:1,members:[{_id:0,host:'10.238.162.33:27017'},{_id:1,host:'10.238.162.33:27018'},{_id:2,host:'10.238.162.33:27019',arbiterOnly:true}]};

初始化变量
rs.initiate(cfg);