Node.js in GitLab

 

Step0:-

> Install Nodejs on Windows

            https://nodejs.org/en/download/

> Install Nodejs on ubuntu 

            curl -fsSL https://deb.nodesource.com/setup_17.x | bash -

            apt-get install -y nodejs

Step 1:- Install Visual Studio Code on your system.

Step2:- Create a folder say C:\nodeapp and open it in visual studio code

           cd c:\nodeapp

           code .

Step3:- Create a index.js file and write below code in this file

const express = require('express')
		const app = express()
		const port = 8080
		app.get('/', (req, res) => {
		  res.send('This is my first Node application!')
		})
		app.listen(port, () => {
		  console.log(`Application is listening at http://localhost:${port}`)
		})

Step 4:- Create package.json file and write below content

{

  "dependencies": {

      "express": "^4.16.1"

  }

 }

Step5: Run below commands in the terminal

          npm install

          node index.js

Then in GitLab:

upload index.js and package.json into the repository.

edit .gitlab-ci.yml file with these examples:

Example 1: This will result in error:

    stages:

  - build

  - deploy

build:

    stage: build

    script: 

        - apt update

        - apt install npm -y

        - npm install

deploy:

    stage: deploy

    script:

        - apt update -y

        - apt install nodejs -y

        - node index.js      

it will result in error because it didn't find the express edition.

because what is installed in build is not passed down to deploy.

Example2: to remedy the above situation, artifacts need to be added into the line of codes. The artifacts line means it will pass down the paths from build to deploy so when deploy job runs, it will have the resources with it. BUT this will result in endless loop..the job will keep on running.

stages:

  - build

  - deploy

build:

    stage: build

    script: 

        - apt update

        - apt install npm -y

        - npm install

    artifacts:

      paths:

      - node_modules

      - package-lock.json

      # expire_in: 1 week 

deploy:

    stage: deploy

    script:

        - apt update -y

        - apt install nodejs -y

        - node index.js        

Example3: to make the above to run in the background. And the pipeline is passed.

stages:
  - build
  - deploy
build:
    stage: build
    script: 
        - apt update
        - apt install npm -y
        - npm install
    artifacts:
      paths:
      - node_modules
      - package-lock.json
      # expire_in: 1 week 
deploy:
    stage: deploy
    script:
        - apt update -y
        - apt install nodejs -y
        - node index.js > /dev/null 2>&1 & 

(The ampersand is the solution, it makes the program run in background)

Example 4: Using docker image rather than scripting apt install.

stages:

  - build

  - deploy

build:

  image: node

  stage: build

  script:

    # - apt update -y

    # - apt install npm -y

    - npm install

  artifacts:

    paths:

      - node_modules

      - package-lock.json

    # expire_in: 1 week 

deploy:

  image: node

  stage: deploy

  script:

    # - apt update -y

    # - apt install nodejs -y

    - node index.js > /dev/null 2>&1 &