使用单机部署为副本集(开启oplog.rs)

环境:
OS:Centos 7
mongodb:5.0.19

mongodb单机环境下是没有oplog.rs,是否有办法在单机环境下也生成oplog.rs呢,答案是可以的,就是使用单机部署副本集.

 

1.修改配置文件加上副本集的配置

[root@localhost conf]# more mongo.cnf 
port=29001
fork=true
dbpath=/home/middle/mongodb/data
logpath=/home/middle/mongodb/log/mongodb.log
pidfilepath=/home/middle/mongodb/run/29001.pid
logappend=true
replSet=s1
bind_ip=192.168.1.105,127.0.0.1
oplogSize=16384
logRotate=reopen

 

yaml格式的配置文件

 

 

[root@localhost conf]# more mongo_yaml.cnf 
net:
  bindIp: 192.168.1.108,127.0.0.1
  port: 29001

storage:
  journal:
    enabled: true
  dbPath: "/home/middle/mongodb/data"
  engine: wiredTiger
  wiredTiger:
    engineConfig:
      cacheSizeGB: 1

systemLog:
  destination: file
  path: "/home/middle/mongodb/log/mongodb.log"
  logAppend: true
  logRotate: reopen

processManagement:
  fork: true
  pidFilePath: "/home/middle/mongodb/run/29001.pid"

replication:
  oplogSizeMB: 16384
  replSetName: s1

security:
  keyFile: "/home/middle/mongodb/key/keyfile"
  authorization: "disabled"

 

[root@localhost mongodb]# cd /home/middle/mongodb/key
[root@localhost key]# openssl rand -base64 741 >>keyfile
[root@localhost key]# chmod 700 keyfile

 

 

说明:

a.  key是区分大小写的，严格按照官网的配置项进行配置,不要想当然的全部转换成小写或是大写

b.  缩进要统一，比如我这里是2个空格进行缩进，不能使用tab键

c.  key: value形式的,value前面需要带上空格

 

参考文档:

https://www.mongodb.com/docs/v4.2/reference/configuration-options/

 

2.单机配置为副本集

use admin
config={_id:'s1',members:[{_id:0,host:'192.168.1.105:29001'}]}
rs.initiate(config)

 

3.查看

s1:PRIMARY> use local
s1:PRIMARY> show tables
oplog.rs
replset.election
replset.initialSyncId
replset.minvalid
replset.oplogTruncateAfterPoint
startup_log
system.replset
system.rollback.id
system.tenantMigration.oplogView
system.views

 

这样就有oplog.rs了.