Começando agora com containers? Já viu o Docker? Docker é um excelente tecnologia de containers que nos ajuda a lidar com problemas de ambiente de dev a produção, isolando a aplicação e suas dependências para serem gerenciar e executadas em qualquer lugar.

1. INICIANDO COM DOCKER
Emmanuel Neri
@emmanuelnerii
www.emmanuelneri.com.br

2. EMMANUEL NERI
‣ Mestre em Desenvolvimento de Tecnologia
‣ Desenvolvedor (Java) desde 2010
‣ Tech lead na Jaya

3. DOCKER

4. CONTAINER

5. CONTAINERS VS VM

6. BENEFÍCIOS
▸ Portável
▸ Flexibilidade
▸ Escalável
▸ Lightweight

7. DOCKER

8. FUNCIONAMENTO
▸ Imagens
▸ Containers
SO
APP

9. COMANDOS
docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete
Digest:
sha256:6540fc08ee6e6b7b63468dc3317e3303aae178cb8a45ed3123180328bcc1d20f
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
…
docker ps
CONTAINER ID|IMAGE|COMMAND|CREATED|STATUS|PORTS|NAMES
docker images
REPOSITORY|TAG|IMAGE ID|CREATED|SIZE
hello-world|latest|fce289e99eb9|7 months ago|1.84kB

10. DOCKER
▸ Docker registry
▸ Docker Host
▸ Imagens
▸ Containers
▸ Volumes
▸ Redes
▸ Daemon
▸ Docker Client

11. ARQUITETURA

12. DOCKERHUB
hub.docker.com

13. DOCKER RUN
docker run -it
--name mongodb
mongo:3.5
MongoDB starting : pid=1 port=27017 dbpath=/data/db 64-bit host=64cbcf1206fe
db version v3.5.13
git version: 52bbaa007cd84631d6da811d9a05b59f2dfad4f3
OpenSSL version: OpenSSL 1.0.1t 3 May 2016
allocator: tcmalloc
modules: none
build environment:
distmod: debian81
distarch: x86_64
target_arch: x86_64
{ net: { bindIpAll: true } }
** See http://dochub.mongodb.org/core/prodnotes-filesystem
** NOTE: This is a development version (3.5.13) of MongoDB.
** Not recommended for production.
** WARNING: Access control is not enabled for the database.
** Read and write access to data and configuration is unrestricted.
Initializing full-time diagnostic data capture with directory '/data/db/diagnostic.data'
setting featureCompatibilityVersion to 3.6
waiting for connections on port 27017

14. DOCKER RUN
docker run -it
--name file-db
-e MONGO_INITDB_ROOT_USERNAME: root
-e MONGO_INITDB_ROOT_PASSWORD: password
mongo:3.5

15. DOCKERFILE
FROM openjdk:8-jdk-alpine
VOLUME /tmp
COPY target/devCia-*.jar app.jar
ENTRYPOINT ["java", "-jar", "/app.jar"]
Dockerfile

16. DOCKERFILE
docker build -t devcia/spring-boot .
Sending build context to Docker daemon 16.96MB
Step 1/4 : FROM openjdk:8-jdk-alpine
---> a3562aa0b991
Step 2/4 : VOLUME /tmp
---> Using cache
---> 681df48914d3
Step 3/4 : COPY target/devCia-*.jar app.jar
---> Using cache
---> dcdf13b91079
Step 4/4 : ENTRYPOINT ["java", "-jar", "/app.jar"]
---> Using cache
---> 98bc1828bab1
Successfully built 98bc1828bab1
Successfully tagged devcia/spring-boot:latest

17. DOCKERFILE
docker run devcia/spring-boot
. ____ _ __ _ _
/ / ___'_ __ _ _(_)_ __ __ _
( ( )___ | '_ | '_| | '_ / _` |
/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |___, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.7.RELEASE)
Tomcat initialized with port(s): 8080 (http)
Started DevCiaApplication in 2.593 seconds (JVM running for 3.121)

18. DOCKERFILE
docker run -p 8080:8080 devcia/spring-boot
. ____ _ __ _ _
/ / ___'_ __ _ _(_)_ __ __ _
( ( )___ | '_ | '_| | '_ / _` |
/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |___, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.7.RELEASE)
Tomcat initialized with port(s): 8080 (http)
Started DevCiaApplication in 2.593 seconds (JVM running for 3.121)

19. DOCKERFILE
▸ FROM
▸ MAINTAINER
▸ RUN
▸ CMD
▸ LABEL
▸ EXPOSE
▸ ENV
▸ ADD
▸ COPY
▸ ENTRYPOINT
▸ VOLUME
▸ USER
▸ WORKDIR
▸ ONBUILD

20. LINKS
docker run -it
--name docker-postgres
-e POSTGRES_DB=db
-e POSTGRES_USER=postgres
-e POSTGRES_PASSWORD=postgres
postgres:10.4
docker run -it
--link docker-postgres
-p 8080:8080
emmanuelneri/spring-boot-docker-app

21. COMPOSE
version: '3'
services:
docker-app:
image: emmanuelneri/spring-boot-docker-app
ports:
- "8080:8080"
depends_on:
- docker-postgres
docker-postgres:
image: postgres:10.4
environment:
- POSTGRES_DB=db
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=postgres
docker-compose up
docker-compose stop

22. BACK-FRONT
version: '3'
services:
web:
image: despesas/despesas-web
ports:
- "3000:3000"
links:
- app
app:
image: despesas/despesas-app
ports:
- "8081:8081"
links:
- db
db:
image: postgres:9.6
ports:
- "5432:5432"
environment:
- POSTGRES_PASSWORD=postgres
- POSTGRES_USER=postgres
- POSTGRES_DB=gestao-despesas

23. OUTROS CASES
▸ Ambientes de dev
▸ Testes automatizados
▸ Integração Continua
▸ Deploy Continuo
▸ Script automatizados
▸ Escalabilidade em produção
▸ Multi cloud

24. COMANDOS IMPORTANTES
‣ docker exec
‣ docker inspect
‣ docker logs
‣ docker stop
‣ docker rm -f

25. BOAS PRÁTICAS
‣ Usar tags das imagens
‣ Não deixar configurações fixas nas imagens
‣ Não armazenar estado

26. CONCLUSÃO
‣ Simples
‣ Utilizado de dev a produção
‣ Proporciona automatização
‣ Portável
‣ Escalável

27. emmanuelnerisouza@gmail.com
@emmanuelnerii
www.emmanuelneri.com.br
github.com/emmanuelneri
emmanuelnerisouza
DÚVIDAS?
Emmanuel Neri