Blocks in containers lessons learned from containerizing Minecraft

@juliaferraioli 2 Julia Ferraioli Software Engineer Open Source @ Google Empathy in tech advocate ML enthusiast

@juliaferraioli 3

@juliaferraioli 4 I’m addicted to Minecraft 4

@juliaferraioli 5

@juliaferraioli 6 Okay, I’m addicted to Minecraft and Lego 6

@juliaferraioli 7

@juliaferraioli 8 Alright, I’m addicted to Minecraft, Lego, and cloud 8

@juliaferraioli 9

@juliaferraioli 10 Fine! I’m addicted to Minecraft, Lego, cloud, and containers 10

@juliaferraioli Let’s talk about containers 11

@juliaferraioli 14%-36% 12 Running in production The New Stack: http://bit.ly/containers-in-prod

What’s the barrier here? 13 CC image courtesy of Kevin: https://flic.kr/p/7EUqHX

@juliaferraioli We have educational resources 14 14

@juliaferraioli We have cloud provider support 15 15

@juliaferraioli We have meetup upon meetup 16 16

17 CC image courtesy of Andrew Albosta: https://flic.kr/p/ab3VhW Missing the link between here and awesometown

We need a toy… problem 18 CC image courtesy of Glenn Calvin: https://flic.kr/p/5LfNZM

19 ❔ ● ...that predate the surge in container popularity? ● ...that are understood/used by many? ● ...that are complex enough that containerization makes sense ...but simple enough to tackle? What sort of fully-baked apps do we have... 19 ❔ ❔

@juliaferraioli 20 20

@juliaferraioli Phase 1: experimentation 21

@juliaferraioli Uh, hello Minecraft? What does Minecraft need? FROM debian:latest RUN apt-get update && apt-get install -y curl openjdk-7-jre ENV MC_VERSION 1.8.9 ENV BASE_URL https://s3.amazonaws.com/Minecraft.Download/versions ENV SERVER_FILE minecraft_server RUN mkdir /opt/mc WORKDIR /opt/mc RUN curl $BASE_URL/$MC_VERSION/$SERVER_FILE.$MC_VERSION.jar \ -o minecraft.jar && chmod u+x minecraft.jar CMD java -Xmx1024M -Xms1024M -jar minecraft.jar nogui 22 Java. It needs Java.

23 CC image courtesy of Josh Wedin: https://flic.kr/p/amAXdF This is kind of old hat

24 Where’s the magic?

@juliaferraioli Phase 2: 25 cautious containerization

@juliaferraioli Building and testing ➜ ~ docker build -t juliaferraioli/mc:v1 . ➜ ~ docker run -p 25565:25565 -d juliaferraioli/mc:v1 d7d5e58f8833952b51d33c9c63a2b763f1a290d33270245a518d17d689f45f39 ➜ ~ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES well, . 26

@juliaferraioli Phase 3: problem identification 27

@juliaferraioli I build and run but nothing happens! `-d` means detached => when our CMD exits, the container exits => `java -Xmx1024M -Xms1024M -jar minecraft.jar nogui` must have exited 28

@juliaferraioli Okay, let’s remove the flag ➜ ~ docker run -p 25565:25565 juliaferraioli/mc:v1 29 [16:33:54] [Server thread/INFO]: Starting minecraft server version 1.9.2 [16:33:54] [Server thread/INFO]: Loading properties [16:33:54] [Server thread/WARN]: server.properties does not exist [16:33:54] [Server thread/INFO]: Generating new properties file [16:33:54] [Server thread/WARN]: Failed to load eula.txt [16:33:54] [Server thread/INFO]: You need to agree to the EULA in order to run the server. Go to eula.txt for more info. [16:33:54] [Server thread/INFO]: Stopping server

@juliaferraioli Ohhhhhh... 30 startServer.sh ● If there’s already an accepted EULA... ● or if we accepted through the ENV... ● go ahead and start the server. ● Else, prompt the user to read the EULA and exit the script CC image courtesy of Betsy Weber: https://flic.kr/p/nE6i31

@juliaferraioli Uh, hello Minecraft? (Reprise) What does Minecraft need? FROM debian:latest RUN apt-get update && apt-get install -y curl openjdk-7-jre ENV MC_VERSION 1.8.9 ENV BASE_URL https://s3.amazonaws.com/Minecraft.Download/versions ENV SERVER_FILE minecraft_server RUN mkdir /opt/mc WORKDIR /opt/mc COPY startServer.sh /opt/mc/ RUN curl $BASE_URL/$MC_VERSION/$SERVER_FILE.$MC_VERSION.jar \ -o minecraft.jar && chmod u+x minecraft.jar startServer.sh CMD ./startServer.sh 31 Java. It needs Java. And an accepted EULA.

@juliaferraioli Lesson(s) 32

33 Storage becomes complicated CC image courtesy of Windell Oskay: https://flic.kr/p/4hAC16

34 Storage stays complicated CC image courtesy of Windell Oskay: https://flic.kr/p/4hAC16

35 Ephemerality is hard to grok CC image courtesy of Spielbrick Films: https://flic.kr/p/bxSAE4

@juliaferraioli Phase 4: 36 containerizing ALL the things!

@juliaferraioli I’m the conductor of this orchestra 37 CC image courtesy of Brian Alano: https://flic.kr/p/npdy7U

@juliaferraioli I’m the conductor of this orchestra ➜ ~ kubectl run mc --image=gcr.io/octopodes-go-bloop/mc:v2 \ --env="EULA=true" --port=25565 ➜ ~ kubectl expose deployment mc type=LoadBalancer ➜ ~ kubectl describe services mc 38

@juliaferraioli Phase 5: freedom! 39

40 Breaking out of the machine CC image courtesy of Shadowman39: https://flic.kr/p/q1oivr

41 Lack of boundaries is freeing CC image courtesy of Chris Sampson: https://flic.kr/p/C4Ebc4

@juliaferraioli Phase 6: absurdity 42

@juliaferraioli Resources ● Minecraft EDU: http://bit.ly/mc-edu ● Dockercraft: http://bit.ly/dockercraft ● Kubernetes: http://bit.ly/k8s-for-users ● Beyond ‘Screen Time’: http://bit.ly/beyond-the-screen ● Where’s the Ball?: http://bit.ly/wheres-the-ball ● Docker documentation: http://bit.ly/docs-docker ● Kubecraft (!!!): http://bit.ly/kubecraft 43

@juliaferraioli 44 CC image courtesy of Sheila Thomson: https://flic.kr/p/bxCySn Thanks!

@juliaferraioli Uh oh! 45 CC image courtesy of Frédérique Voisin-Demery: https://flic.kr/p/t7Kmn9

@juliaferraioli 46