Docker Developer Guide#02

Docker Concepts & Guide

Summary

1. Concepts of Container
2. Development Container
3. Deploy of Container
4. GitHub Package
5. Upload Image to Docker Hub
6. Docker Install WSL2
7. Import & Export Container
8. Docker Cheat Sheet
9. Docker Volumes
10. Portainer.io
11. Setup /etc/docker/daemon.json
12. References

1. Concepts of Contaitner

Diference Container x Virtual Machine

2. Developer Container

3. Deploy Container

3.1. Google Cloud Platform

Google Cloud Run

3.2. AWS

AWS Elastic Container Service

Amazon EC2 Container Service - AWS

Amazon EC2 Container Service - AWS

3.3. Kurbenetes

Diferences Beteween K8s x K3s

What's the difference between k3s vs k8s - Civo.com

K3S

Lightweight Kubernetes

curl -sfL https://get.k3s.io | sh -
# Check for Ready node,
takes maybe 30 seconds
k3s kubectl get node

3.4. Start Docker

sudo dockerd &

4. GitHub Package

• ghcr.io

• https://github.com/Software-Engineering-2030/sample-docker/new/main?filename=.github%2Fworkflows%2Fmain.yml&workflow_template=blank

name: CI
on:
  workflow_dispatch:
  
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout
      uses: actions/checkout@v2
      
    - uses: azure/docker-login@v1
      with:
        login-server: ghcr.io
        username: ${{ secrets.GH_PACKAGES_USER }}
        password: ${{ secrets.GH_PACKAGES_TOKEN }}
        
    - run: 
        docker build -t ghcr.io/Software-Engineering-2030/sample-docker/demovideo:latest -f Dockerfile
        docker tag ghcr.io/Software-Engineering-2030/sample-docker/demovideo ghrc.io/Software-Engineering-2030/sample-docker/demovideo:${{github.sha}}
        
    - run: 
        docker push ghcr.io/Software-Engineering-2030/sample-docker/demovideo:latest
        docker push ghcr.io/Software-Engineering-2030/sample-docker/demovideo:${{github.sha}}

5. Upload Image to Docker Hub

• docker ps -a
• docker commit Imagem repo
• docker push repo
• docker login -username=username -email=email@docker.com
• https://hub.docker.com

docker login -u=xxxx -p=yyyy
docker login -u="${DOCKER_USERNAME}" -p="${DOCKER_PASSWORD}"

6. Docker Install WSL2

Pre-reqs

sudo apt update && sudo apt upgrade
sudo apt remove docker docker-engine docker.io containerd runc
sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

Update Sources Ubuntu

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
echo \
  "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Install Docker Engine

sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io

Docker Permission Users

sudo usermod -aG docker $USER

Install Docker Composer

sudo curl -L "https://github.com/docker/compose/releases/download/1.29.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose

Install Docker Service Start(*)

sudo service docker start

Docker Bash, Commit, Push

docker pull ubuntu
docker run -it -d ubuntu
docker exec -it aa3e7607dbac bash
docker commit aa3e7607dbac viannaandre/ubuntu-test:latest
docker push viannaandre/ubuntu-test:latest

GitHub Package

7. Import & Export Container

• https://www.vivaolinux.com.br/dica/Como-exportar-um-container-Docker-para-outra-maquina

Export Container

# docker container ls -a
# docker export meudjango | gzip > meudjango.gz

Copy Container

scp meudjango.gz servidor:/destino

Destination Host

# ssh usuario@servidor
# zcat meudjango.gz | docker import - meudjango

Execute Host

# docker run -it meudjango bash

8. Docker Cheat Sheet

• https://github.com/xcad2k/cheat-sheets/blob/main/infrastructure/docker.md

9. Docker Volumes

Docker Backup / Restore

Docker Backup / Restore

Docker Volume Bind

Docker Volume Bind

Docker Migration Strategy

How to persist and backup PostgreSQL Docker container

• https://dev.to/sirak/how-to-persist-and-backup-postgresql-docker-container-b75

PostgreSQL Docker Backup

version: '3.1'
services:
  db:
    image: postgres
    restart: always
    environment:
      POSTGRES_USER: myuser
      POSTGRES_PASSWORD: mypassword
      POSTGRES_DB: mydb
    volumes:
       - ./data:/var/lib/postgresql/data

How to persist and backup MySQL Docker container

Structure

Docker Migration Volumes

• https://www.youtube.com/watch?v=ZEy8iFbgbPA&t=86s
• Volumes
• Binds

Docker Backup / Restore Volumes

• https://github.com/xcad2k/cheat-sheets/blob/main/infrastructure/docker.md

Backup a container

Backup docker data from inside container volumes and package it in a tarball archive. docker run --rm --volumes-from CONTAINER -v $(pwd):/backup busybox tar cvfz /backup/backup.tar CONTAINERPATH

Restore container from backup

Restore the volume with a tarball archive. docker run --rm --volumes-from CONTAINER -v $(pwd):/backup busybox bash -c "cd CONTAINERPATH && tar xvf /backup/backup.tar --strip 1"

¬

Docker Volume Backup / Restore (Checked)

• https://stackoverflow.com/questions/26331651/how-can-i-backup-a-docker-container-with-its-data-volumes#:~:text=To%20backup%20a%20data%20volume,data%20for%20a%20MySQL%20server.

Backup

#!/bin/bash
# This script allows you to backup a single volume from a container
# Data in given volume is saved in the current directory in a tar archive.
CONTAINER_NAME=$1
VOLUME_NAME=$2

usage() {
  echo "Usage: $0 [container name] [volume name]"
  exit 1
}

if [ -z $CONTAINER_NAME ]
then
  echo "Error: missing container name parameter."
  usage
fi

if [ -z $VOLUME_NAME ]
then
  echo "Error: missing volume name parameter."
  usage
fi

sudo docker run --rm --volumes-from $CONTAINER_NAME -v $(pwd):/backup busybox tar cvf /backup/backup.tar $VOLUME_NAME

Restore

#!/bin/bash
# This script allows you to restore a single volume from a container
# Data in restored in volume with same backupped path
NEW_CONTAINER_NAME=$1

usage() {
  echo "Usage: $0 [container name]"
  exit 1
}

if [ -z $NEW_CONTAINER_NAME ]
then
  echo "Error: missing container name parameter."
  usage
fi

sudo docker run --rm --volumes-from $NEW_CONTAINER_NAME -v $(pwd):/backup busybox tar xvf /backup/backup.tar

Usage can be like this:

$ volume_backup.sh old_container /srv/www
$ sudo docker stop old_container && sudo docker rm old_container
$ sudo docker run -d --name new_container myrepo/new_container
$ volume_restore.sh new_container

10. Portainer.io

• https://www.portainer.io/

portainer.io

• https://docs.portainer.io/v/ce-2.11/start/install/server/docker/wsl

Docker Volume

docker volume create portainer_data

Docker Container

docker run -d -p 8000:8000 -p 9443:9443 --name portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce:2.11.0
https://localhost:9443

11. Setup /etc/docker/daemon.json

/etc/docker/daemon.json

{
  "dns": ["8.8.8.8"]
}

Restart Docker:

sudo service docker restart

• https://github.com/gliderlabs/docker-alpine/issues/334
• https://github.com/Backend-2030/NestJS-Keycloak-Bug-Fix

11. References

• https://www.docker.com/sites/default/files/d8/2019-09/docker-cheat-sheet.pdf
• https://dockerlabs.collabnix.com/
• https://hub.docker.com/
• https://caylent.com/blog/docker/docker-commands-cheat-sheet
• https://dev.to/sirak/how-to-persist-and-backup-postgresql-docker-container-b75
• https://www.nanoshots.com.br/2017/01/docker-restaurando-dumps-em-containers.html
• https://www.youtube.com/watch?v=ZEy8iFbgbPA&t=86s
• https://github.com/xcad2k/cheat-sheets/blob/main/infrastructure/docker.md