https://github.com/mugilan-codes/node-devops-docker-demo

https://github.com/mugilan-codes/node-devops-docker-demo

devops docker docker-compose dockerfile droplet expressjs mongodb mongoose nginx redis

Last synced: 4 months ago
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• Host: GitHub
• URL: https://github.com/mugilan-codes/node-devops-docker-demo
• Owner: Mugilan-Codes
• Created: 2021-05-24T07:53:37.000Z (over 4 years ago)
• Default Branch: main
• Last Pushed: 2021-06-14T05:54:00.000Z (over 4 years ago)
• Last Synced: 2025-06-05T12:08:26.163Z (4 months ago)
• Topics: devops, docker, docker-compose, dockerfile, droplet, expressjs, mongodb, mongoose, nginx, redis
• Language: JavaScript
• Homepage:
• Size: 228 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# node-devops-docker-demo

## Practicing Node Devops with Docker

[Devops with Docker and Node.js Youtube Playlist](https://www.youtube.com/playlist?list=PL8VzFQ8k4U1JEu7BLraz8MdKJILJir7oY)

### Resource

- [Nginx and Let’s Encrypt with Docker in Less Than 5 Minutes](https://pentacent.medium.com/nginx-and-lets-encrypt-with-docker-in-less-than-5-minutes-b4b8a60d3a71)

- [Setup Nginx and Let’s Encrypt with Docker](https://www.thirdrocktechkno.com/blog/setup-nginx-and-lets-encrypt-with-docker/)

- [Docker compose of nginx, express, letsencrypt SSL get 502 Bad gateway](https://stackoverflow.com/questions/57743088/docker-compose-of-nginx-express-letsencrypt-ssl-get-502-bad-gateway)

### Commands

- Build App Image

  ```sh

  docker build -t node-devops-docker-demo-image .

  ```

- Run a Container (port fowarding, bind mount(read-only), and anonymous volume)

  ```sh

  docker run -v $(pwd):/app:ro -v /app/node_modules -p 3000:4000 --env-file ./.env -d --name node-devops-docker-demo node-devops-docker-demo-image

  ```

- Access FileSystem

  ```sh

  docker exec -it node-devops-docker-demo bash

  ```

- Exit FileSystem

  ```sh

  exit

  ```

- Forcefully Remove a container with volume

  ```sh

  docker rm node-devops-docker-demo -fv

  ```

- Using Docker Compose

  - Build App

    ```sh

    docker-compose up -d

    ```

  

  - use this if there is a change in image (Dockerfile)

    ```sh

    docker-compose up -d --build

    ```

  - Delete App

    ```sh

    docker-compose down -v

    ```

  - Development docker-compose command

    - up

  

      ```sh

      docker-compose -f docker-compose.yml -f docker-compose.dev.yml up -d

      # force re-build image for changes

      docker-compose -f docker-compose.yml -f docker-compose.dev.yml up -d --build

      # re-build image without downing the container and re creating anonymous volumes

      docker-compose -f docker-compose.yml -f docker-compose.dev.yml up -d --build -V

      # scale the number of instances

      docker-compose -f docker-compose.yml -f docker-compose.dev.yml up -d --scale node-app=2

      ```

    - down

      ```sh

      docker-compose -f docker-compose.yml -f docker-compose.dev.yml down -v

      # don't remove volumes

      docker-compose -f docker-compose.yml -f docker-compose.dev.yml down

      ```

  - Production docker-compose command

    - up

  

      ```sh

      docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d

      # force re-build image for changes

      docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d --build

      ```

    - down

      ```sh

      docker-compose -f docker-compose.yml -f docker-compose.prod.yml down -v

      # don't remove volumes

      docker-compose -f docker-compose.yml -f docker-compose.prod.yml down

      ```

- Open MongoDB directly

  ```sh

  docker exec -it node-devops-docker-demo_mongodb_1 mongo -u "mugil" -p "mypassword"

  ```

  **note**: Don't pass in `-v` flag to remove the volumes when using databases as it would ultimately remove all volumes, Instead start up the containers and run `docker volume prune` to remove unused volumes.

- Get network details of container

  ```sh

  docker inspect 

  ```

  **note**: you can directly use the service name from docker-compose instead of using the ipAddress(works only for the services created/declared in docker-compose).

- Open Redis CLI

  ```sh

  docker exec -it node-devops-docker-demo_redis_1 redis-cli

  ```

  - View Session Keys

    ```sh

    KEYS *

    ```

  - Get Session Details

    ```sh

    GET 

    ```

### Steps to Production

- Create Ubuntu Server on Cloud Platforms like **Digital Ocean** (I am using this one), AWS, etc..

- Create a Droplet

- Copy the IP Address of the Droplet provided

- Open a terminal in your computer and SSH into the droplet

  ```sh

  ssh root@

  ```

- Type in `yes` to conntinue connecting

- Type in your root password that you used while creating the droplet

- Install docker engine in the droplet

  ```sh

  curl -fsSL https://get.docker.com -o get-docker.sh

  sh get-docker.sh

  ```

- Install docker-compose by following instructions in the official documentation for linux

  ```sh

  sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

  sudo chmod +x /usr/local/bin/docker-compose

  ```

- Set Environment Variables

  ```sh

  export =

  ```

- Show all Env variables

  ```sh

  printenv

  ```

- Instead of individually adding env variables, setup .env file and add the .env variables into it

  ```sh

  vi .env

  ```

- Open `.profile` and add this at the bottom

  ```sh

  vi .profile

  ```

  ```vim

  

  set -o allexport; source /root/.env; set +o allexport 

  ```

- Create a directory and move into it

  ```sh

  mkdir app

  cd app

  ```

- Clone the Git repo in this folder and pull whenever there is a change

  ```sh

  git clone  .

  ```

  **Note**: This works with public repo. If you want to work with private repos, check [Deploy Keys](https://docs.github.com/en/developers/overview/managing-deploy-keys) section or [How to clone your private repository from GitHub to server, Droplet, VDS, etc?](https://dev.to/koddr/quick-how-to-clone-your-private-repository-from-github-to-server-droplet-vds-etc-39jm)

- Run the production docker-compose command

  ```sh

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d

  # do this to see any changes made

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d --build

  # rebuild only necessary service to avoid checking other containers unneccessarily

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d --build node-app

  # when you don't want to check for dependencies

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d --build --no-deps node-app

  # force rebuild containers even when there is no change

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d --force-recreate node-app

  # force rebuild containers even when there is no change without dependecies

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d --force-recreate --no-deps node-app

  ```

- Make requests to `http:///` routes

- Push Images to docker to avoid building images on production server. Create a repo in `dockerhub`

  - Tag the local image with the name of that of the remote image

  

    ```sh

    docker tag      

    ```

  - Push the tagged image to dockerhub

    ```sh

    docker push 

    ```

- Build the image on local machine

  ```sh

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml build

  # build only the services that is required (custom image)

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml build node-app

  ```

- Push the custom build image to dockerhub

  ```sh

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml push

  # push only the services that we want

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml push node-app

  ```

- Pull the latest images in the production server

  ```sh

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml pull

  # only specific image

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml pull node-app

  ```

- Update the changes in producton server

  ```sh

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d

  # specific rebuild

  docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d --no-deps node-app

  ```

- Use watchtower to automatically look for changes in the remote custom build image (specify the images that needs to be watched at the end)

  ```sh

  docker run -d --name watchtower -e WATCHTOWER_TRACE=true -e WATCHTOWER_DEBUG=true -e WATCHTOWER_POLL_INTERVAL=50 -v /var/run/docker.sock:/var/run/docker.sock containrrr/watchtower app_node-app_1

  ```

  **NOTE**: No need to pull and update changes in production server if watchtower is used

- Activate docker swarm for orchestration. Get IP of the droplet by `ip add` command

  ```sh

  docker swarm init --advertise-addr 

  ```

  - Add more manager nodes, run this command and follow the instructions

    ```sh

    docker swarm join-token manager

    ```

  - Add worker node to swarm

    ```sh

    docker swarm join --token  :

    ```

- Deploy

  ```sh

  docker stack deploy -c docker-compose.yml -c docker-compose.prod.yml myapp

  ```

  - check how many nodes are running

    ```sh

    docker node ls

    ```

  - check how many stacks are there

    ```sh

    docker stack ls

    ```

  - list the services in the stack

    ```sh

    docker stack services myapp

    ```

  - list all the services across all stacks

    ```sh

    docker service ls

    ```

  - list the tasks in the stack

    ```sh

    docker stack ps myapp

    ```

#### TODO

- [X] Add SSL Certificate (https)

- [X] Add Domain Name

- [ ] Modify ./init-letsencrypt.sh to use docker swarm and production docker compose

- [ ] Run the modified ./init-letsencrypt.sh on the server for first time to generate fake certificates

- [ ] Everything must be automated

#### Docker Images

- [node](https://hub.docker.com/_/node)

- [mongo](https://hub.docker.com/_/mongo)

- [redis](https://hub.docker.com/_/redis)

- [nginx](https://hub.docker.com/_/nginx)

#### DOCS

- [Express behind proxies](https://expressjs.com/en/guide/behind-proxies.html)

- [Docker Script for Ubuntu](https://get.docker.com/)

- [Install Docker Compose](https://docs.docker.com/compose/install/)

- [Watchtower](https://containrrr.dev/watchtower/)

- [Docker Compose Deploy Reference](https://docs.docker.com/compose/compose-file/compose-file-v3/#deploy)