openSUSE Conference 2017 - The Docker at Travis Presentation

Ladislav SlezákYaST [email protected]

Docker at TravisThere is no excuse for NOT using a CI

Why Travis?

Travis – Introduction

● CI as a service (hosted)● Free for open source projects● Integrated with GitHub

Travis

● Builds run in Ubuntu 12.04 (Precise) or 14.04 (Trusty) VM● 12.04 is discontinued, even 14.04 is pretty old● What if you need a newer compiler, libraries?● What if you need a completely different distro?● Local/remote debugging not possible

Why Docker?

Docker

● Works out of box at Travis● Container based, no virtualization● Lightweight (minimal overhead)● Many base OS images available● Easy to build and publish your own images

Example1: Snapper

Snapper

● A tool for managing file system snapshots● Portable, built for many distributions in OBS● Single Git source repository● Changed less frequently

Snapper – Travis Implementation

● Separate Dockerfile (defines the Docker image) and build script for each target distribution

● The Docker images are built at Travis– Easier to maintain

– Takes some more time

● The targets are built in parallel at Travis

Snapper – Travis

https://travis-ci.org/openSUSE/snapper

Example2: YaST

YaST

● Not portable, (open)SUSE specific● Does not work in other distributions● Modular design● 100+ Git source repositories● Bigger development team, frequent changes

YaST – Old Ubuntu Setup

● Build YaST packages for Ubuntu 12.04 in OBS– Not a full port! Just enough for running unit tests

(system access is simulated)

● Extra work, hard to maintain● Not reliable (false positives or uncaught issues)● Limited scope for tests (cannot build RPM easily)

YaST – New Docker Setup

● Pre-built Docker images at Docker Hub– Faster (only built once)

– Two images for Ruby or C++ packages

– The Travis script is included (shared)

Docker at Travis – Summary

● Less maintenace● More reliable builds

– Using the real target distribution

● Easier debugging– Use the same Docker image locally

● Independent on Travis default OS– Ubuntu 12.04 will be dropped soon (switch to 14.04)

Questions?

Links

● https://blog.ladslezak.cz/2017/03/28/docker_at_travis/● https://travis-ci.org/● https://docs.travis-ci.com/user/docker/● https://docs.docker.com/● https://github.com/openSUSE/snapper/blob/master/README.Travis.md● https://yastgithubio.readthedocs.io/en/latest/travis-integration/● https://github.com/yast/docker-yast-ruby● https://hub.docker.com/r/yastdevel/ruby/

Contacts

● ML: [email protected]● IRC: #yast at freenode.net

Thank You!

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