Docker provides an integrated technology suite
that enables development and IT operations
teams to build, ship, and run distributed
applications anywhere.
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In human now.
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Containers.
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Lightweight virtualization.
ie: No video hardware emulation.
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Some devops now hate me.
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Deploy everywhere.
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Easy scalability.
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Even auto scaling.
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Deploying Django: Old school.
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Deployed! Congratulations!
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Your users have now quadrupled!
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Server are old, let’s go virtual!
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Different technology, same problem.
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Django and Docker?
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Configuration files.
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First steps.
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Classes
Instances
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More devops hate me now.
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Dockerfile
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An entire OS for just a part of the Django
project?
$ docker run --name postgres -e POSTGRES_DB=mayan -e POSTGRES_USER=mayan -e
POSTGRES_PASSWORD=mysecretpassword -v /var/lib/postgresql/data -d postgres
$ docker run --name redis -d redis
$ docker run --name mayan-edms -p 80:80 --link postgres:postgres --link redis:redis -e POSTGRES_DB=mayan -e
POSTGRES_USER=mayan -e POSTGRES_PASSWORD=mysecretpassword -v /usr/local/lib/python2.7/dist-
packages/mayan/media -d mayanedms/monolithic
until nc -z $POSTGRES_PORT_5432_TCP_ADDR $POSTGRES_PORT_5432_TCP_PORT; do
echo "$(date) - waiting for postgres..."
sleep 1
done
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Service synchronization doesn’t belong in
configuration files.
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until nc -z $POSTGRES_PORT_5432_TCP_ADDR $POSTGRES_PORT_5432_TCP_PORT; do
echo "$(date) - waiting for postgres..."
sleep 1
done
until nc -z $RABBITMQ_PORT_5672_TCP_ADDR $RABBITMQ_PORT_5672_TCP_PORT; do
echo "$(date) - waiting for rabbitmq..."
sleep 1
done
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More problems.
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● Not foolproof
● Mute services
● nc is not universal
● API URL paths?
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Solutions?
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$ docker run -d --name mycontainer some-image-or-other
$ docker run --link mycontainer:mycontainer aanand/wait
waiting for TCP connection to 172.17.0.105:5432......ok
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Interesting, but...
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An entire container to run nc.
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Cool solution, wrong problem.
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It’s the container manager’s responsibility.
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Kubernetes approach
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Port, path, initial delay & timeout!
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Docker upstream native approach needed
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Templating
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Docker images are static.
Less reusable.
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Docker containers are configured with
environment variables.
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uWSGI support environment variables.
NGINX doesn’t.
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Docker upstream native approach needed
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“Thank you for using Docker”
“But your fix is in another repository”