User - Roboshop Project

The "User" microservice is responsible for handling user logins and registrations in the RobotShop e-commerce portal. It was developed using Node.js and requires a version above 18.

The following code can create the Ec2 instance user for us

{
  "MaxCount": 1,
  "MinCount": 1,
  "ImageId": "ami-0089b8e98cd95257d",
  "InstanceType": "t3.micro",
  "EbsOptimized": true,
  "NetworkInterfaces": [
    {
      "DeviceIndex": 0,
      "AssociatePublicIpAddress": true,
      "SubnetId": "subnet-086a045ade7eae99f",
      "Groups": [
        "sg-0c2e3fdd288a74d3a"
      ]
    }
  ],
  "TagSpecifications": [
    {
      "ResourceType": "instance",
      "Tags": [
        {
          "Key": "Name",
          "Value": "user"
        }
      ]
    },
    {
      "ResourceType": "spot-instances-request",
      "Tags": [
        {
          "Key": "Name",
          "Value": "user"
        }
      ]
    }
  ],
  "InstanceMarketOptions": {
    "MarketType": "spot",
    "SpotOptions": {
      "InstanceInterruptionBehavior": "stop",
      "SpotInstanceType": "persistent"
    }
  },
  "PrivateDnsNameOptions": {
    "HostnameType": "ip-name",
    "EnableResourceNameDnsARecord": true,
    "EnableResourceNameDnsAAAARecord": false
  }
}

To set up the Node.js repositories, the vendor provides a script that can be run using the command:

curl -sL https://rpm.nodesource.com/setup_lts.x | bash

After that, Node.js can be installed using

yum install nodejs -y

Since the application has no RPM software, every step needs to be configured manually.

To follow best practices, the application is set up to run as a non-root user. The application user useradd roboshop is created and will only be used to run the application, not to log in to the server. The application is kept in a standard location and an app directory is set up using the command

mkdir /app

The application code is then downloaded using

curl -L -o /tmp/user.zip https://roboshop-artifacts.s3.amazonaws.com/user.zip 
unzip /tmp/user.zip

Like most applications, this one has some common dependencies, which can be downloaded using npm install in the app directory. A new service is then set up in systemd using the following configuration file located at

vim /etc/systemd/system/user.service

Add the following;

[Unit] 
Description = User Service 
[Service] 
User=roboshop Environment=MONGO=true Environment=REDIS_HOST=Enter-Redis-IP
Environment=MONGO_URL="mongodb://MONGODB-IP:27017/users" 
ExecStart=/bin/node /app/server.js SyslogIdentifier=user

[Install] 
WantedBy=multi-user.target

The service can be loaded using

systemctl daemon-reload

The schema must be loaded into the database to fully enable the application's functionality. This can be done by installing the MongoDB client using the following repo file located at

vim /etc/yum.repos.d/mongo.repo

[mongodb-org-4.2] 
name=MongoDB Repository baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.2/x86_64/ 
gpgcheck=0 
enabled=1

yum install mongodb-org-shell -y

Then, the schema can be loaded using

mongo --host MONGODB-SERVER-IPADDRESS </app/schema/user.js