láďa prskavec: docker.io
Post on 06-May-2015
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Ladislav Prskavec @abtris -‐ DEVEL 9.11.2013
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Docker is an open-‐source project to easily create lightweight, portable, self-‐sufficient containers from any applicaHon.
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The same container that a developer builds and tests on a laptop can run at scale, in producHon, on VMs, bare metal, OpenStack clusters, public clouds and more.
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BeNer than VMs
★ Size
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BeNer than VMs
★ Size
★ Performance
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BeNer than VMs
★ Size
★ Performance
★ Portability
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BeNer than VMs
★ Size
★ Performance
★ Portability
★ Hardware-‐centric
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Escape dependency hell
★ Cross-‐plaRorm dependencies
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Escape dependency hell
★ Cross-‐plaRorm dependencies
★ ConflicHng dependencies
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Escape dependency hell
★ Cross-‐plaRorm dependencies
★ ConflicHng dependencies
★ Custom dependencies
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Here's a typical Docker build process (Dockerfile)
from ubuntu:12.10
run apt-‐get update
run DEBIAN_FRONTEND=noninteractive apt-‐get install -‐q -‐y python
run DEBIAN_FRONTEND=noninteractive apt-‐get install -‐q -‐y python-‐pip
run pip install django
run DEBIAN_FRONTEND=noninteractive apt-‐get install -‐q -‐y curl
run curl -‐L https://github.com/shykes/helloflask/master.tar.gz | tar -‐xzv
run cd helloflask-‐master && pip install -‐r requirements.txt
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Under the hood
★ GO
★ The cgroup and namespacing capabiliHes of the Linux kernel
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Under the hood
★ GO
★ The cgroup and namespacing capabiliHes of the Linux kernel
★ AUFS, a powerful union filesystem with copy-‐on-‐write capabiliHes
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Under the hood
★ GO
★ The cgroup and namespacing capabiliHes of the Linux kernel
★ AUFS, a powerful union filesystem with copy-‐on-‐write capabiliHes
★ lxc, a set of convenience scripts to simplify the creaHon of Linux containers
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Zero downHme deployment
using private registry
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App running in prod hNp://praguejs.cz !!!
-‐ Build local
> docker build -‐t=praguejs .
-‐ Test local
> docker run -‐p 49200:3333 praguejs
hNp://localhost:49200
-‐ Change some files
-‐ Rebuild & test
> docker build -‐t praguejs
> docker run -‐p 49200:3333 praguejs
vagrant@precise64:~$ docker ps CONTAINER ID IMAGE b2332dffe registry.abtris.cz:5000/praguejs:latest
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Push to producHon • Tag image in order to push it> docker tag praguejs registry.abtris.cz:5000/praguejs
• Push image to local registry> docker push registry.abtris.cz:5000/praguejs
• On producHon server, pull image> docker pull registry.abtris.cz:5000/praguejs
• Start new container > docker run -‐d -‐p 127.0.0.1::3333 <image>
• Change configuraHon at nginx/haproxy and restart
• See changes live
vagrant@precise64:~$ docker ps CONTAINER ID IMAGE b2332dffe registry.abtris.cz:5000/praguejs:latest d45222331 1b4f43asds
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