Docker

Por que container?

• Deploy rápidos em menores unidades.

• Uso menor de recursos.

• Maior capacidade em um mesmo host.

• Automatizações mais rápidas.

• Portabilidade.

• Isolado

• 

O que é virtualização

• Inicio imediato

• Leves

• Ideal para terafas curtas

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What is Docker

• Um open source container runtime.

• Suporte para Mac, Windows & Linux.

• Command line tool (CLI).

• Arquivo para construri os containers "Dockerfile".

• Windows deixa rodar containers Windows and Linux.

Registro de Containers

• Repositorio centralizado de containers

• GitHub para Containers

• Docker Hub

  • https://hub.docker.com/

• Cloud Providers tambem tem seus próprios Registros de Containers

Orquestradores

• Gerenciar

  • Infrastructure

  • Containers

  • Deployment

  • Scaling

  • Failover

  • Health monitoring

  • App Upgrades, Zero-Downtime deployments

• Escolha entre a grande variedades

  • Kubernets, Swarm, Service Fabric

How to install

É Necessario instalar o dockers engine atraves do link:

Install Docker Engine | Docker Documentation

Obs: No Windows é preferivel usar o WSL (Windows subsystem for Linux).

CLI Commands

docker cli
docker version	Display the system's version
docker login	Log in to a Docker registry
docker info	Display system information
docker pull [imageName]	Pull an image from a registry
docker run [imageName]	Run containers
docker run -d [imageName]	Detached mode
docker start [containerName]	Start stopped containers
docker ps	List runnig containers
docker ps -a	List running and stopped containers
docker stop [containerName]	Stop containers
docker kill [containerName]	Kill containers
docker image inspect [imageName]	Get image info

Docker Bash example

#pull and run an nginx server
docker run --publish 80:80 --name webserver nginx

#list the running containers
docker ps

#stop the container
docker stop webserver

#remove the container
docker rm webserver

Docker CLI Cheat Sheet - Attach Shell

Docker attach shell
docker run -it -- /bin/bash	Attach shell
docker run -it -- microsoft/powershell:nanoserver	Attach Powershell
docker container exec -it [containerName] -- bash	Attach to a running containe

Docker CLI Cheat Sheet - Cleaning up

docker
docker rm [containerName]	Removes stopped containers
docker rm $(docker ps -a -q)	Removes all stopped containers
docker images	Lists images
docker rmi [imageName]	Deletes image
docker system prune -a	Remove all images not in use by any container

Docker CLI Cheat Sheet - Cleaning up

docker
docker build -t [name:tag] .	Builds an image using Dockerfile located in the same folder
docker build -t [name:tag] -f	Build an image using a Dockerfile located in a different folder
docker tag [imageName] [name:tag]	Tag an existing image

Dockerfile - nginx

FROM nginx:alpine
COPY . /usr/share/nginx/html

Dockerfile - Node site

FROM alpine
RUN apk add -update nodejs nodejs-npm
COPY . /src
WORKDIR /src
RUN npm install
EXPOSE 8080
ENTRYPOINT ["node", "./app.js"]

Docker CLI - Tagging

docker tag => Create a target image

• name:tag

  • myimage:v1

• repository/name:tag

  • myacr.azurecr.io/myimage:v1

Video Original no canal do YouTube freeCodeCamp.org em inglês

Docker Containers and Kubernetes Fundamentals – Full Hands-On Course - YouTube

Mãos à massa!

git clone https://github.com/juliano-pinheiro-martinello/docker

cd /docker

docker build -t image-test .