docker: ao vivo e a cores
TRANSCRIPT
"Na minha máquinafunciona!"– você?
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Como assim containers?
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Implantação de Aplicações
https://www.datadoghq.com/blog/the-docker-monitoring-problem/
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E por que só agora?
https://en.wikipedia.org/wiki/Docker_(software)
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Imagens de Software
https://delftswa.github.io/chapters/docker/
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Principais engines de tempo de execução
http://docker.com/ http://coreos.com/rkt/
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Execução de Processos em Containers
https://coreos.com/rkt/docs/latest/rkt-vs-other-projects.html
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Ao vivo!
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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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Construindo um Container: aplicaçãoServidor 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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Construindo um Container: DockerfileArquivo 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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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-get clean
---> 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
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 instance at 0x7ff4de58b758>
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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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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Por onde continuar?
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Docker para Desenvolvedores
https://leanpub.com/dockerparadesenvolvedores
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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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