The document is a detailed guide on using Docker, covering the basics of containerization, the process of building and running containers with examples, and compiling services using Docker Compose. It includes code snippets for creating a simple echo server and instructions for pulling images and running commands in Docker. Additionally, it provides links to resources for further learning about container technologies and orchestration tools.

1. Docker
ao vivo e a cores
Pedro Arthur P. R. Duarte
pedroarthur.jedi@gmail.com

2. "Na minha máquina
funciona!"
– você?
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3. Como assim containers?
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4. Implantação de Aplicações
https://www.datadoghq.com/blog/the-docker-monitoring-problem/
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5. E por que só agora?
https://en.wikipedia.org/wiki/Docker_(software)
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6. Imagens de Software
https://delftswa.github.io/chapters/docker/
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7. Principais engines de tempo de execução
http://docker.com/ http://coreos.com/rkt/
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8. Execução de Processos em Containers
https://coreos.com/rkt/docs/latest/rkt-vs-other-projects.html
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9. Ao vivo!
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10. Baixando e executando containers
r2@d2 $ docker pull debian:jessie
jessie: Pulling from library/debian
386a066cd84a: Pull complete
Digest: sha256:c1ce85a0f7126a3b5cbf7c57676b01b37c755b9ff9e2f39ca88181c02b985724
Status: Downloaded newer image for debian:jessie
r1@d2 $ docker run -it debian:jessie /bin/bash
root@c0c4c014d3af:/# ping 4.2.2.2
PING 4.2.2.2 (4.2.2.2): 56 data bytes
64 bytes from 4.2.2.2: icmp_seq=0 ttl=53 time=109.191 ms
--- 4.2.2.2 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max/stddev = 109.191/109.191/109.191/0.000 ms
root@c0c4c014d3af:/# exit 0
r1@d2 $ docker run -t debian:jessie ping -c 1 4.2.2.2
# mostly the same as the previous command
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11. Construindo um Container: aplicação
Servidor de Echo
#!/ usr/bin/env python
from twisted.internet.protocol import Protocol , Factory
from twisted.internet import reactor
from twisted.python import log
from sys import stdout
class Echo(Protocol ):
def dataReceived (self , data ):
log.msg("Received", data)
self.transport.write(data)
log. startLogging (stdout)
log.msg("Echo server is starting")
reactor.listenTCP (8000 , Factory. forProtocol (Echo ))
reactor.run ()
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12. Construindo um Container: Dockerfile
Arquivo de Descrição do Container
FROM debian:jessie
RUN apt -get update
&& apt -get install -y python -twisted
&& apt -get clean
COPY echo_server .py /usr/local/bin
EXPOSE 8000
CMD exec /usr/local/bin/ echo_server .py
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13. Construindo um Container: build
r2@d2 $ docker build -t poticon_echo_server:1.0 .
Sending build context to Docker daemon 5.12 kB
Step 1 : FROM debian:jessie
---> 73e72bf822ca
Step 2 : RUN apt-get update && apt-get install -y python-twisted && apt
---> Running in e37b92a3c12b
# a lot of apt-get-related output
---> 6fbd3015ca0c
Removing intermediate container e37b92a3c12b
Step 3 : COPY echo_server.py /usr/local/bin
---> 87add3168ac0
Removing intermediate container 956612405c96
Step 4 : EXPOSE 8000
---> Running in 810fee23449d
---> 70890ad7e011
Removing intermediate container 810fee23449d
Step 5 : CMD exec /usr/local/bin/echo_server.py
---> Running in 65fd3384e5eb
---> 1b46b966c54e
Removing intermediate container 65fd3384e5eb
Successfully built 1b46b966c54e

14. Executando e Testando nosso container
r2@d2 $ docker run -t --net=host poticon_echo_server:1.0
2016-11-24 12:53:19+0000 [-] Log opened.
2016-11-24 12:53:19+0000 [-] Echo server is starting
2016-11-24 12:53:19+0000 [-] Factory starting on 8000
2016-11-24 12:53:19+0000 [-] Starting factory <twisted.internet.protocol.Factory in
2016-11-24 12:53:28+0000 [Echo,0,127.0.0.1] Received Hi, there!
# at another terminal; ts comes from moreutils
r2@d2 $ nc 127.0.0.1 8000 | ts ’%F %T’
Hi, there!
2016-11-24 12:53:28 Hi, there!
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15. Composição de Serviços
r2@d2 $ cat docker-compose.yaml
version: ’2’
services:
redis:
image: redis
postgresql:
image: postgres
environment:
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=$PG_PASSWORD
r2@d2 $ export PG_PASSWORD=p0t1c0n
r2@d2 $ docker-compose up -d # -d puts them in background
r2@d2 $ docker-compose logs # use -f to follow
r2@d2 $ docker-compose down # mind other commands such as stop and start
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16. Por onde continuar?
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17. Docker para Desenvolvedores
https://leanpub.com/dockerparadesenvolvedores
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18. Links Úteis
Tecnologias de Containers:
– Docker: http://github.com/docker/
– Rkt: http://coreos.com/rkt
Orquestradores de Containers
– CoreOS: http://coreos.com
– Kubernetes: http://github.com/kubernetes
– Swarm: http://docker.com/swarm
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