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Catalogue

Catalogue is a microservice that is responsible for serving the list of products that displays in roboshop application.

Developer has chosen NodeJs, Check with developer which version of NodeJS is needed. Developer has set a context that it can work with NodeJS >18

Install NodeJS, By default NodeJS 10 is available, We would like to enable 18 version and install list.

you can list modules by using dnf module list

dnf module disable nodejs -y
dnf module enable nodejs:18 -y

Install NodeJS

dnf install nodejs -y

Configure the application.

Our application developed by the developer of our company and it is not having any RPM software just like other softwares. So we need to configure every step manually

Add application User

useradd roboshop

User roboshop is a function / daemon user to run the application. Apart from that we don't use this user to login to server.

Also, username roboshop has been picked because it more suits to our project name.

We keep application in one standard location. This is a usual practice that runs in the organization.

Lets setup an app directory.

mkdir /app

Download the application code to created app directory.

curl -o /tmp/catalogue.zip https://roboshop-builds.s3.amazonaws.com/catalogue.zip

cd /app 

unzip /tmp/catalogue.zip

Every application is developed by development team will have some common softwares that they use as libraries. This application also have the same way of defined dependencies in the application configuration.

Lets download the dependencies.

cd /app

npm install

We need to setup a new service in systemd so systemctl can manage this service

Setup SystemD Catalogue Service

vim /etc/systemd/system/catalogue.service

[Unit]
Description = Catalogue Service

[Service]
User=roboshop
Environment=MONGO=true
Environment=MONGO_URL="mongodb://<MONGODB-SERVER-IPADDRESS>:27017/catalogue"
ExecStart=/bin/node /app/server.js
SyslogIdentifier=catalogue

[Install]
WantedBy=multi-user.target

Load the service.

systemctl daemon-reload

Start the service.

systemctl enable catalogue

systemctl start catalogue
  • For the application to work fully functional we need to load schema to the Database.
  • Schemas are usually part of application code and developer will provide them as part of development.

We need to load the schema. To load schema we need to install mongodb client.

To have it installed we can setup MongoDB repo and install mongodb-client

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

dnf install mongodb-org-shell -y

Load Schema

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

NOTE: You need to update catalogue server ip address in frontend configuration. Configuration file is /etc/nginx/default.d/roboshop.conf