Android meets Docker

Presented at Codemotion Rome 2018.

Transcript

1. Android meets Docker Jing Li ROME - APRIL 13/14 2018
3. Founded in 2009 13 countries & 70+ cities ~ 120K drivers ~ 11M active passengers Hamburg Barcelona Berlin 600+ employees
4. Developer Story
5. Pain in the Admin provision ∞ machines
6. Containerization vs Virtualization
7. Why Docker? Resource Isolation Supported OS Boot / Stop Time Size Low Extreme Linux Seconds MB * Minutes GB
8. Where the problem comes Infer - A tool to detect bugs in Java and ... code. Infer (http://fbinfer.com/) by Facebook, Inc. Update Android SDK in Docker container ☠ AUFS
9. Dockerfile Best Practices " Single responsibility ◦ use compose for orchestration " Minimize the number of layers ◦ layer = intermediate image, supports caching " Size matters, use what you have ◦ Install & un- by separated steps will ⇧ image size " Readability
10. Different Approaches " BTRFS storage driver " One image per Android API level " Mount SDK volume
11. Solution for SDK update Mount SDK volume in container minimal by Bakunetsu Kaito from the Noun Project, spring by Free Fair & Healthy from the Noun Project, Save by Rflor from the Noun Project, Share by Matteo Della Chiesa from the Noun Project
12. NFS ✅ In one place ❓ Performance ⾠ No concurrent writing
13. Benchmark
14. Performance Comparison 2 build types, 107 unit tests ( x2 = 214 ), 2 UI tests ./gradlew clean check :demo:connectedAndroidTest On-premises Docker (w/ cached AndroidSDK) 6 mins 48.0 secs Other online CI solutions (w/o optimization) > 10 mins
15. Android Devices " ARM emulator " x86 emulator (requires KVM) " USB (needs privileged mode, ⛔ for macOS) " Wifi " Cloud solutions (e.g. Genymotion Cloud)
16. Emulator
17. VNC Image size " without VNC-server ◦ 563 MB " with VNC-server ◦ 626 MB
18. Performance of 2 UI tests ARM emulator @ 2 mins 4.615 secs x86 emulator @ (on Linux Host) 23.497 secs Genymotion 25.335 secs
19. Out Of Memory
20. Memory Matters _JAVA_OPTIONS -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap Exit Code 137 = 128 + 9 = SIGKILL = Killed 1 = SIGHUP = Hangup Comment killed by the kernel OOM killer JVM terminates the program and exits JVM is not container aware
21. " Set up env ◦ /root/.ssh/environment " Authorization ◦ /root/.ssh/authorized_keys SSH
22. Jenkins Env Var " Global level ◦ Configure System -> Global properties -> Environment variables " Node level ◦ Manage Nodes -> Configure Node -> Node Properties -> Environment variables " Job level ◦ Configure Job -> Build -> Build Step -> Execute shell ◦ Plugin: Environment Injector -> Inject variables to the build process / as a build step
23. Can we get any better? Gradle distribution
24. Gradle distributions mirror server " From: gradle/wrapper/gradle-wrapper.properties " To: ~/.gradle/wrapper/dists " SSL certificate - needs to be trusted by Java keystore " /etc/hosts
25. And better? Gradle caches ◦ Don’t waste time downloading dependencies ◦ ~/.gradle/caches/ Compiling (https://xkcd.com/303/) by xkcd
26. Reveal machine-dependent problem " Encoding problem ◦ expected:<Hall[��]chen> but was:<Hall[ö]chen> " Hard coded Timezone in test ◦ expected:2099-12-31T00:00:00.0000+0200
 but was: 2099-12-31T00:00:00.0000+0000 " File & Path ◦ File#listFiles() -> File[] (sort order depends on OS)
27. What else for mobile " Integration Test ◦ Prod / Test server ▪ unreliable network ▪ complex setup ◦ Docker ▪ out of the box for mobile dev " Something else ◦ Serverless ( Kotlin, Swift ) - reuse code
28. Hiring " Offices in Hamburg, Berlin, Barcelona and etc. " Visa sponsor, offer ✈ ◦ Android Developers ◦ iOS Developers ◦ SDET ◦ Backend / Frontend / Data / * Engineers https://de.mytaxi.com/jobs
29. Grazie thyrlian Docker Image: https://github.com/thyrlian/AndroidSDK thyrlian