GARETH RUSHGROVE Product Manager, Docker Cloud-Native Developer Workflows for Docker Applications

- The building blocks for Docker applications - What we mean by developer workflow - Reducing developer friction - Lots of demos What we’ll cover

The Docker fundamentals Building Blocks

Docker Desktop - Docker and Kubernetes on your local machine - Easy to install and easy to manage

- Describe the steps to build a Docker image - More than 1.1m Dockerfiles public on GitHub Dockerfile # We name the `base` stage so we can reference it in multiple later # stages but only need to update it in one place if we change it FROM python:3-alpine AS base WORKDIR /app RUN pip install pipenv==2018.10.13 COPY Pipfile /app/ COPY Pipfile.lock /app/ RUN pipenv install --system --deploy # The `app` stage is used as the base for images that don't # need the development dependencies FROM base AS app COPY src /app # The `test-base` stage is used as the base for images that require # the development dependencies. FROM base AS test-base

Compose and Kubernetes config - Describe the components of your multi-service application in code version: '3.7' services: sensu-backend: image: sensu/sensu:latest command: sensu-backend start hostname: sensu-backend ports: - 3000:3000 - 8080:8080 sensu-agent: image: sensu/sensu:latest command: sensu-agent start --backend-url ws://sensu-backend:8081 depends_on: - sensu-backend deploy: replicas: 4

Your source code - The most important part. Your application. export default () => (

How we use our tools together Workflow

workflow Noun the sequence of industrial, administrative, or other processes through which a piece of work passes from initiation to completion.

The hard way - Just use the low-level tools - Workflow is by memory, or maybe documentation if you’re lucky $ kubectl run --image hello-dockercon:1 hello --port=8080 deployment.apps "hello" created $ kubectl get deployment hello -o json { "apiVersion": "extensions/v1beta1", "kind": "Deployment", "metadata": { "annotations": { "deployment.kubernetes.io/revision": "1" }, "creationTimestamp": "2018-11-26T12:42:53Z", "generation": 1, "labels": { "run": "hello" }, "name": "hello", "namespace": "default",

Pick and mix - Wrap everything in a Makefile (or similar) - Introduce other tools $ make do-everything

From within an IDE - Integrated functionality in your editor - Customisation via plugins $ cat spec.txt Cloud Native Application Bundle Core 1.0.0 (CNAB1) Working Draft, Nov. 2018 Cloud Native Application Bundles (CNAB) are a standard packaging format for multi-component distributed applications. It allows packages to target different runtimes and architectures. It empowers application distributors to package applications for deployment on a wide variety of cloud platforms, cloud providers, and cloud services. It also provides the capabilities necessary for delivering multi-container applications in disconnected environments. CNAB is not a platform-specific tool. While it uses

The same fundamentals - Writing code - Testing code - Building artefacts - Running code

Working with others Team Workflow

Source control - Share code and changes with other people

Continuous integration - Ensure you always have a working, integrated version of your software

Docker registry - Store your artefacts centrally - Avoid the need to constantly rebuild and retest

The same fundamentals - Writing code - Testing code - Building artefacts - Running code

Time for a few demos Reducing Developer Friction

friction Noun the resistance that one surface or object encounters when moving over another.

friction Noun conflict or animosity caused by a clash of wills, temperaments, or opinions.

developer friction Made up concept the resistance that a developer encounters when trying to do their job

friction Noun ...the energy lost to friction is turned into sound and heat.

So how can we reduce the friction when it comes to developer workflow?

Demo time

If all you remember is... Conclusions

Build - Multi-stage builds can reduce the need for scripts - New tools like docker assemble reduce the need for configuration at all $ docker fab build . [+] Building 8.2s (13/16) => local://project (docker-hlb.yaml) => => transferring project: 2B => local://project (*.[fc]sproj) => => transferring project: 2B => local://project (pom.xml) => => transferring project: 29B => resolve image config for docker.io/library/maven:3-jdk-10-slim => resolve image config for docker.io/docker/dockerfile-copy:v0.1.8 => resolve image config for docker.io/library/openjdk:10-jre-slim => runtime image => => resolve docker.io/library/openjdk:10-jre-slim@sha25 => => sha256:7e9a9557c5738bcf45787bbc6bf5fff60f06562c2ddb

Inner-loop development - Change code or configuration, automatically rebuild images and run application locally $ cat skaffold.yaml apiVersion: skaffold/v1alpha5 kind: Config build: tagPolicy: sha256: {} artifacts: - image: garethr/skaffold-example local: useBuildkit: true deploy: kubectl: manifests: - stack.yaml

Testing - Fast feedback - Share tests between applications to help enforce organisational policy $ cat .github/main.workflow action "test" { uses = "actions/docker/cli@master" args = "build --target test ." } action "security" { uses = "actions/docker/cli@master" secrets = ["MICROSCANNER"] args = "build --target security --build-arg MICROSCANNER } action "lint" { uses = "actions/docker/cli@master" args = "run -i hadolint/hadolint hadolint -

Packaging multi-service applications - Share applications with others easily with docker app - Reduce operator friction by defining clear interfaces $ docker-app install garethr/myapp Waiting for the stack to be stable and running... service1: Ready service2: Ready mysql: Ready Stack hello is stable and running

- Always be looking for ways to reduce developer friction - Improvements might be incremental, or they might be revolutionary - Composable tools are one honking great idea, let's do more of those! In summary

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Come Join Us In San Francisco April 29-May 2 2019

Thanks And any questions?