Docker.io
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Docker is an open-source platform that allows for the creation of lightweight, portable containers that can run consistently across various environments. It offers advantages over traditional virtual machines, such as improved size, performance, and portability while helping to resolve dependency issues. The document outlines the typical build process using Docker, including commands for setting up an application and deploying it to production.
Docker.io
- 1. Ladislav Prskavec @abtris -‐ DEVEL 9.11.2013 1
- 2. Docker is an open-‐source project to easily create lightweight, portable, self-‐sufficient containers from any applicaHon. 2
- 3. 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. 3
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- 5. BeNer than VMs ★ Size 5
- 6. BeNer than VMs ★ Size ★ Performance 6
- 7. BeNer than VMs ★ Size ★ Performance ★ Portability 7
- 8. BeNer than VMs ★ Size ★ Performance ★ Portability ★ Hardware-‐centric 8
- 9. Escape dependency hell ★ Cross-‐plaRorm dependencies 9
- 10. Escape dependency hell ★ Cross-‐plaRorm dependencies ★ ConflicHng dependencies 10
- 11. Escape dependency hell ★ Cross-‐plaRorm dependencies ★ ConflicHng dependencies ★ Custom dependencies 11
- 12. 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 12
- 13. Under the hood ★ GO ★ The cgroup and namespacing capabiliHes of the Linux kernel 13
- 14. Under the hood ★ GO ★ The cgroup and namespacing capabiliHes of the Linux kernel ★ AUFS, a powerful union filesystem with copy-‐on-‐write capabiliHes 14
- 15. 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 15
- 16. Zero downHme deployment using private registry 16
- 17. App running in prod hNp://praguejs.cz ! vagrant@precise64:~$ docker ps ! CONTAINER ID IMAGE ! b2332dffe registry.abtris.cz:5000/praguejs:latest -‐ 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 17
- 18. 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> vagrant@precise64:~$ docker ps • Change configuraHon at nginx/haproxy and restart CONTAINER ID IMAGE b2332dffe registry.abtris.cz:5000/praguejs:latest • See changes live d45222331 1b4f43asds 18
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