下载mongodb

yum安装

vi /etc/yum.repos.d/mongodb-org-4.2.repo

[mongodb-org-4.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.2/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.2.asc

yum install -y mongodb-org

修改配置文件

cd /etc/mongod.conf

# network interfaces
net:
  port: 27017
  bindIp: 0.0.0.0  # Enter 0.0.0.0,:: to bind to all IPv4 and IPv6 addresses or, alternatively, use the net.bindIpAll setting.
  maxIncomingConnections: 100

#security:
security:
  authorization: enabled  // 创建用户后开启权限
#operationProfiling:

启动可能报错

Job for mongod.service failed because the control process exited with error code. See "systemctl status mongod.service" and "journalctl -xe" for details.

1. 权限问题
cd /tmp/
chown mongod:mongod mongodb-27017.sock

2. YAML配置问题
cd /etc/mongod.conf

创建admin用户

use admin

db.createUser({user:"admin",pwd:"admin",roles:[{ role: "userAdminAnyDatabase", db: "admin" }]})

开启权限认证后创建数据库/用户

## 配置文件
#security:
security:
  authorization: enabled  // 创建用户后开启权限

db.auth(账号，密码)
use 新建的数据库
db.createUser(
  {
    user: "username",
    pwd: "password",
    roles: [ { role: "readWrite", db: "新建的数据库" } ]
  }
);

node连接

1. yarn add mongodb

2. 建立连接

var MongoClient = require('mongodb').MongoClient;
var url = 'mongodb://用户名:密码@ip地址:27017/数据库名';
MongoClient.connect(url, function (err, db) {
  if (err) {
    console.error(err);
    return;
  } else {
    console.log('Connected correctly to server');
    var dbase = db.db('数据库名');
    dbase.collection("user").insertOne({username: 'test', password: 'test'}, function(err, res) {
      if (err) throw err;
      console.log('插入成功');
      db.close();
    })
  }
});