Tech Talks 1: Docker - Speaker Deck

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Tech Talks: docker

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Introduction ● Backend Engineer at Xtend Indonesia ● CTO of TestMate ● Member of Indonesian Bioinformatics and Biodiversity Society ● Google Developer Groups Medan ● Open source enthusiast and Communities Fellow ● Tech Background: Backend stuff, IaaS & PaaS Cloud, DevOps, more at https://fikihfirmansyah.my.id

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Apa yang akan dibahas - Perkenalan fitur docker - Perbandingan dengan sistem lain - Tutorial docker sederhana - Dockerfile

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Apa yang tidak akan dibahas - Memanfaatkan docker di real-life - Implementasi infrastruktur docker - Implementasi teknis lanjut

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- Mudah dipelajari - Paus nya lucu - Dibikin pakai go

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serius :)

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Perubahan arsitektur

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Fitur - images ● Ngebungkus setiap aplikasi dalam “kotak” yang sama (dependencies dan bisa dijalankan di mana saja) ● Mengisolasi berbagai hal dari satu sama lain ● Prosedur pembuatan yang terstandarisasi (Dockerﬁle)

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Containers

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Fitur - containers ● Mengelola kontainer ○ Menjalankan & menghentikan ○ Menyimpan & memuat (dari file) ● Memasang volume ○ Sharing data ○ Persistensi data ● Membuat Jaringan yang menghubungkan antar containers

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Works on everyone's machine

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Isolation

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Portability

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Fitur - workflow ● Docker daemon dan CLI ● Docker hub dan registry ● Image versioning (pull, commit, pull, layers)

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Docker vs VM

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secara sederhana

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Ringan dan cepat

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Sharing OS

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Not really a VM

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Why docker? Why not lxc?

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Why docker? Why not lxc?

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Why docker? Why not lxc?

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Docker tutorial

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Pull it! $ docker pull busybox ● Search docker registry for repository of given name ● Downloads the repository ● Pulls only changes

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Pull it! $ docker pull busybox ● Search docker registry for repository of given name ● Downloads the repository ● Pulls only changes next time

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Pull it! $ docker pull busybox ● Search docker registry for repository of given name ● Downloads the repository ● Pulls only changes next time

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RUN!

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Run it! $ docker run busybox:ubuntu- 14.04 echo "hello" ● Make sure that image is available (downloads if not found) ● Create a container ● Run a command

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Run it! $ docker run -it busybox:ubuntu- 14.04 sh ● -it → makes container interactive ● Create a container ● Give you a shell access

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More complicated example ● Run laravel project in a container ● Run it as a daemon ● ● Bind it to network Make storage persistent

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Run it! $ docker run -d -v /var/docker/redis:/da ta -p 6379:6379 --name=redis dockerfile/redis ● -d → launch as daemon ● -v /var/docker/redis:/data → mount directories ● -p 6379:6379 → forward ports

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Watch it! $ docker ps Prints out information about docker containers

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Watch it! $ docker ps -a Prints out information about all docker containers: ● Running ● Exited

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Watch it! $ docker logs -t --follow romantic_enstein ● Get logs from stdin/stdout of container ● -t → show timestamp ● --follow → similar to tail -f

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Watch it! $ docker inspect romantic_enstein ● Get info about container ● Environment variables ● Ports Links

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Watch it! nsenter ssh ● nsenter uses namespaces ● Ssh needs ssh server inside

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Tidy up docker rm docker rmi ● Docker images use lots of space ● Docker images can clog all your available space on server (no more pulling from registry)

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Repository workflow docker diff docker commit attero/stuff:my-tag ● Versioning! Tags ● Multiple versions Push & pull

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What we learned so far ● Repository workflow ○ Pull ○ Commit ○ Push ● Tidying up after containers ○ Rm ○ Rmi ● Monitoring ○ Ps ○ Logs ○ Inspect ○ Top ● Running containers ○ Interactive ○ Daemon ○ Mounting ○ Forwarding

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Containers are nice :)

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How about automation?

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DOCKERFILE

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DOCKERFILE

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DOCKERFILE -Version control -Automation -Portability

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DOCKERFILE # Use the official Node.js 14 image as a base FROM node:14 # Set the working directory in the container WORKDIR /usr/src/app # Copy package.json and package-lock.json (if available) to the working directory COPY package*.json ./ # Install app dependencies RUN npm install # Bundle app source inside the Docker image COPY . . # Expose port 3000 to the outside once the container has launched EXPOSE 3000 # Define the command to run the app CMD ["node", "index.js"]