How to create SSL certificate on Ubuntu(22.04 (LTS) x64) droplet for Mongo?

I solved this problem. When I ran the code directly from Node Js, the connection was successful. When I ran the code from the Docker container, the mongoose did not connect.

You need to add the following dns config to docker compose:

version: '3'
...
  backend:
    build:
      context: .
      dockerfile: Dockerfile
    dns:
      - 8.8.8.8
      - 4.4.4.4

Mongoose connection code for DigitalOcean Mongodb Cluster

import mongoose from 'mongoose'
...
const mongoConnectionString = 'CONNECTION_STRING_FROM_DIGITAL_OCEAN_ADMIN_PANEL';
const mongoDbName = ''
const mongooseOptions = {
    user: mongoUserLogin,
    pass: mongoUserPassword,
    tls: true,
    dbName: mongoDbName,
    tlsInsecure: true,
    useUnifiedTopology: true,
    useNewUrlParser: true,
    keepAlive: true
}
mongoose.connect(mongoConnectionString, mongooseOptions)
  .then(() => {
    console.log('Mongo is connected')
  })
  .catch(error => {
    console.log('MONGO_ERROR_CONNECTION')
  })