Mongodbn cluster replica set

I am a newbie and I just ordered it based on my own needs. This is also my first time working on a mognodb cluster. Dear gods, please don’t complain. The writing is a bit messy, let’s take a look at it first
1. Create and configure the mongodb.conf file:
vi /etc/mongodb.conf (enter the following content)

fork=true #Run as a daemon and create a server process
logpath=/alidata/webroot/logs/work.log #Log output file path
logappend=true #Log output method
dbpath=/data/db #Database path
replSet=firstdb #Set the name of the rich collection

Then go into the bin directory of mongodb and execute the following command:
Note: Kill the mongod process first and then use the following command
./mongod -f /etc/mongodb.conf (start) Note: etc/rc.lcoal must also be changed to this mongod -f /etc/mongodb.conf

When entering the bin directory and executing ./mongo and then show dbs, a problem will occur: liasdatabase

When this problem occurs, it is because of initialization:
First try the command to shut down mongodb:
./mongod --dbpath=/alidata/approot/mongodb/mongodb-linux-x86_64-3.2.7/data/db/ --shutdown

Add these configurations to the configuration file:

journal=true
oplogSize = 4096
Then execute in the bin directory of mongodb: ./mongod -f /etc/mongodb.conf
Check whether the startup is successful: If the startup is successful, enter the bin directory of mongodb
Execute command: ./mongo
Then: rs.initiate(
{
_id: "rs0",
version: 1,
members: [
{ _id: 0, host : "ip:27017", priority: 30},
{ _id: 1, host: "ip:27017", priority: 20 },
{ _id: 2, host: "ip:27017", priority: 10 }
]
}
)

Then use the command: rs.ststus() to check
{
"info" : "run rs.initiate(...) if not yet done for the set",
"ok" : 0,
"errmsg" : "no replset config has been received",
"code" : 94
}
If it is displayed like this, it means that the other two have written data:
Stop the two slaves: clear the data or change the folder
mv db db.bak
mkdir db
chmod -R 777 db
Then start
Execute the above command again: rs.initiate(
{
_id: "rs0",
version: 1,
members: [
{ _id: 0, host : "ip:27017", priority: 30},
{ _id: 1, host: "ip:27017", priority: 20 },
{ _id: 2, host: "ip:27017", priority: 10 }
]
}
)
Then use the command: rs.status()
Then go to the slave node and check the logs
Then use the command: top to check the load
Then check the synchronization process on the slave node: you must enter the logs directory to execute the following command to view the process
Use the command: tail -f work.log
Then go to the main node and use the command: use test
Then use the command: find image_weibo.files.find()
If there is data, execute the command from the mongo node:
rs.slaveOk()
Both slave nodes must execute this command:
Then use the command use test
Then use the command db.image_weibo.files.find() to check whether there is data. If there is data, the synchronization is successful. OK!
Then insert data on the master node to test:
db.image_weibo.insert({title: 'MongoDB Tutorial',
description: 'MongoDB is a Nosql database',
by: 'xx11',
url: 'http://www.baidu.com',
tags: ['mongodb', 'database', 'NoSQL'],
likes: 100
})