Can you build CI/CD pipelines from scratch to deploy a system? Automate support, deployment, updates?

Yes, I can build a CI/CD pipeline from scratch for automating deployment, updates, and system maintenance. The process typically includes the following stages:

1. Version control — source code is stored in a version control system (Git).
2. Build and testing — automatic builds and tests (unit, integration) are triggered upon commits.
3. Artifact publication — built packages or container images are stored in a repository.
4. Deployment — automatic deployment to testing, then to production servers.
5. Monitoring and rollback — tracking application status and the ability to quickly rollback in case of errors.

Tools like Jenkins, GitLab CI/CD, GitHub Actions, ArgoCD, Terraform, etc., can be used for implementation.

Here's a simple example of a GitHub Actions workflow for a Node.js application:

name: CI/CD Pipeline
on:
  push:
    branches: [ main ]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version: '16'
      - run: npm install
      - run: npm test
      - run: npm run build
      - name: Deploy
        run: |
          scp -r ./build user@server:/var/www/app
          ssh user@server 'systemctl restart app'

This pipeline allows automating support, deployment, and updating of the application.