AWS Lambda + PlanetScale = 超絶スケールWebアプリ

ServerlessでもRDBを利用して数百インスタンスが瞬時に起動するようなWebアプリをたった数ドルで作れる世界になりました
このスライドではその大枠を説明します

1. AWS Lambda + PlanetScale = ௒ઈεέʔϧWebΞϓϦ 2023/07/14 גࣜձࣾιχοΫΨʔσϯ ԕ౻ େհ / @ruzia ·ͩχονͰ Զಘ͔͠ͳ͍
2. ࣗݾ঺հ ‣ ԕ౻ େհ / @ruzia ‣ גࣜձࣾ SonicGarden ‣ ϓϩάϥϚʔ / ࣥߦ໾һ ‣ Πϯϑϥͱػցֶशܥ͕޷͖ ‣ ϩʔυόΠΫ࠷ۙ৐Εͯͳ͍ ‣ FF16ʹͲͬ΀Γਁ͔Γத
3. ٸʹSNSͰόζͬͨΓͯ͠΋ ྑ͍ײ͡ʹεέʔϧͯ͠ ͘ΕΔΠϯϑϥͳ͍΋Μ͔
4. ཉΛݴ͑͹ɾɾɾ ‣RailsͳͲͷϑϨʔϜϫʔΫΛͦͷ··࢖͍͍ͨ ‣σʔλετΞʹ͸RDB͕࢖͍͍ͨ ‣਺ඦΠϯελϯεͱ͔ࣗಈͰεέʔϧͯ͠ཉ͍͠ ‣ඇಉظ / ఆظͷJob΋࣮ߦ͍ͨ͠ ‣One-o ff λεΫ΋࣮ߦ͍ͨ͠
5. Q ͦΜͳΠϯϑϥ ͋ΔΜͰ͔͢ʁ
6. A ࡞ΕͪΌ͏ΜͰ͢ ͔͠΋਺υϧͱ͔Ͱ
7. ࠓ೔͸ͦΜͳ Πϯϑϥͷ࿩Λ͠·͢ ·ͩχον ͚ͩͲԶಘͳ
8. ࿩͢͜ͱ ‣LambdaͱFargateΛ׆༻࣮ͨ͠ߦ؀ڥ ‣Webαʔό ‣ඇಉظɾఆظJob ‣One-o f λεΫ ‣PlanetScaleʹΑΔεέʔϥϒϧͳRDB
10. LambdaͱFargateΛ ׆༻࣮ͨ͠ߦ؀ڥ
11. ͦΕͧΕͷ ڧΈ
12. LambdaͷڧΈ ‣େن໛ʹεέʔϧ͢Δॠൃྗ ‣ܹ͍͠εύΠΫ΁ͷॊೈੑ Fargateʹ͸ͳ͍
13. FargateͷڧΈ ‣௕࣌ؒͷλεΫ࣮ߦ ‣ECS ExecʹΑΔϩάΠϯ Lambdaʹ͸ͳ͍
14. ͦΕͧΕͷڧΈΛ׆͔͢ ‣Lambda ‣εύΠΫͷܹ͍͠WebͷϦΫΤετड͚෇͚ ‣15෼ະຬͰऴྃ͢ΔܰΊͷJob ‣Fargate ‣15෼Ҏ্࣌ؒͷ͔͔ΔॏΊͷJob ‣ϩάΠϯͯ͠৭ʑͨ͘͠ͳΔOne-o f λεΫ
15. େࣄͳϙΠϯτ
16. େࣄͳϙΠϯτ ޻෉͢Ε͹ ಉ͡DockerΠϝʔδΛ ྆ํͰ࢖͑Δ ࣮͸
17. ϕʔεͷDockerΠϝʔδ͸ Lambda Runtime APIͰ Lambdaͱ΍ΓͱΓ Ͱ͖ΔΑ͏ʹ
18. # Install the Runtime Interface Client RUN gem install --no-document aws_lambda_ric ENTRYPOINT ["/usr/local/bundle/bin/aws_lambda_ric"] CMD ["config/environment.Lamby.cmd"]
19. FargateͰ͸ඞཁʹԠͯ͡ CommandͱEntryPointΛ ΦʔόʔϥΠυ͢Δ
20. tasks: oneoff: name: ${self:service}-${self:provider.stage}-oneoff image: rails_image command: entryPoint: - '/bin/sh' - '-c' - "sleep infinity"
21. Web΋Job΋One-o f ΋ શͯΛ୯ҰͷDocker ΠϝʔδͰ࣮ߦͰ͖Δ
22. Webαʔό
23. Webαʔό ‣API Gatewayܦ༝Ͱݺͼग़͞ΕΔ ‣Runtime Interface Clientʹ
 ४ڌ͍ͯ͠Δඞཁ͕͋Δ
24. Railsͷ৔߹͸ Lambyͱ͍͏OSS͕ ໘౗Λݟͯ͘ΕΔ
26. ඇಉظJob
27. ඇಉظJob ‣WebαʔόͰಉظॲཧ͠ͳͯ͘
 ྑ͍෺͕౤͛ΒΕͯ͘Δ ‣SQSʹͨΊͯLambdaͰॱ࣍
 ࣮ߦ͍ͯ͘͠
28. Railsͷ৔߹͸ Lambdakiqͱ͍͏ OSSͰରԠՄೳ
30. ఆظJob
31. ఆظJob ‣ఆظతʹಈ͔͍ͨ͠όονॲཧ ‣EventBridge΍CloudWatch Events͔Β ࣮ߦ͢Δ ‣୹࣌ؒͷ΋ͷ͸Lambda΁ ‣௕࣌ؒͷ΋ͷ͸Fargate΁
32. functions: job: image: <<: *rails_image environment: ${self:custom.environment} memorySize: 1024 timeout: 890 events: - schedule: name: HourlyJob-${self:service}-${self:provider.stage} rate: cron(0 * * * ? *) input: lamby: runner: './bin/rails task:hourly_job'
33. fargate: tasks: HourlyJob: name: HourlyJob-${self:service}-${self:provider.stage} image: rails_image command: entryPoint: - '/bin/sh' - '-c' - "./bin/rails task:hourly_job" schedule: 'cron(0 * * * ? *)'
34. One-o f λεΫ
35. One-o f λεΫ ‣खಈͰ࣮ߦ͍ͨ͠όονॲཧͱ͔ ‣ԿΒ͔ͷཧ༝Ͱ rails c ͍ͨ͠৔߹ͱ͔ ‣ίϯςφ಺෦͔ΒௐࠪΛ͍ͨ͠৔߹ͱ͔ ‣etc...
36. One-o f λεΫ͸ར༻࣌ʹ Fargateͷઐ༻λεΫΛ ىಈͯ͠ECS Exec͢Δ
37. One-o f λεΫ͕ ऴΘͬͨΒFargateͷ λεΫ΋ऴྃͤ͞Δ
38. fargate: tasks: oneoff: name: ${self:service}-${self:provider.stage}-oneoff image: rails_image command: entryPoint: - '/bin/sh' - '-c' - "sleep infinity"
39. #!/usr/bin/env bash set -e APP_NAME="sample" STAGE=${1:-staging} CLUSTER="${APP_NAME}-${STAGE}" ... LATEST_TASK_DEFINITION_ARN=$( aws ecs list-task-definitions --family-prefix $CLUSTER-oneoff ... ) echo "== Run console on Fargate..." echo "== Starting $LATEST_TASK_DEFINITION_ARN" TASK_ARN=$( aws ecs run-task --cluster $CLUSTER --task-definition $LATEST_TASK_DEFINITION_ARN ... ) echo "== TaskArn: ${TASK_ARN}" aws ecs wait tasks-running --cluster $CLUSTER --tasks $TASK_ARN echo "== Waiting for managed agent launch..." while true; do AGENT_STATUS=$( aws ecs describe-tasks --cluster $CLUSTER --tasks $TASK_ARN ... ) if [[ "$AGENT_STATUS" != "RUNNING" ]]; then sleep 1 else # ΤʔδΣϯτͷىಈ͔Β͞Βʹ 2 ඵ͘Β͍଴ͨͳ͍ͱ ssm ͕ܨ͕Βͳ͍ sleep 2 break fi done aws ecs execute-command --cluster $CLUSTER --task $TASK_ARN --container ${CLUSTER}-oneoff ... echo "== Stopping $LATEST_TASK_DEFINITION_ARN" aws ecs stop-task --cluster $CLUSTER --task $TASK_ARN > /dev/null 2>&1 ࠷৽ͷλεΫఆٛARNΛऔಘ λεΫΛ࣮ߦ λεΫͷىಈ଴ͪ Managed Agentͷىಈ଴ͪ ECS ExecͰϩάΠϯ λεΫΛऴྃ
40. ࿩͢͜ͱ ‣LambdaͱFargateΛ׆༻࣮ͨ͠ߦ؀ڥ ‣Webαʔό ‣ඇಉظɾఆظJob ‣One-o f λεΫ ‣PlanetScaleʹΑΔεέʔϥϒϧͳRDB
41. PlanetScale
43. Serverless MySQL Platform
44. ଟগͷบ͸͋Δ͚Ͳ DBʹίωΫγϣϯΛ ܨ͍ͰΫΤϦΛ౤͛ΒΕΔ
45. WebΞϓϦ͔ΒݟΔͱ ΄΅௨ৗͷMySQL
46. ͦΕͳͷʹ ίωΫγϣϯ਺ͱ͍͏ ଍ᐫ͕ଘࡏ͠ͳ͍ ڪΖ͍͠ ͜ͱʹ
48. PlanetScaleͰ͋Ε͹ Lambda͕εέʔϧͯ͠΋ ා͘ͳ͍
49. PlanetScaleͷར఺ ‣΄΅ී௨ͷMySQL ‣ίωΫγϣϯ਺ͱ͍͏଍ᐫ͕ແ͍ ‣՝͕ۚ༰ྔɾಡΈॻ͖ͷྔϕʔε
50. PlanetScaleͷ஫ҙ఺ ‣1τϥϯβΫγϣϯͷ੍࣌ؒݶ͕͋Δ ‣1ΫΤϦ͋ͨΓͷ੍࣌ؒݶ͕͋Δ ‣ΧϥϜ΍ςʔϒϧͷϦωʔϜ͕ෆՄ
51. Lambda΍Fargateͱ ૊Έ߹ΘͤΔͱ࠷ڧͷ σʔλετΞʹͳΔ
52. ·ͱΊ
53. ࿩ͨ͜͠ͱ ‣LambdaͱFargateΛ׆༻࣮ͨ͠ߦ؀ڥ ‣Webαʔό ‣ඇಉظɾఆظJob ‣One-o f λεΫ ‣PlanetScaleʹΑΔεέʔϥϒϧͳRDB
54. ͝ਗ਼ௌ͋Γ͕ͱ͏ ͍͟͝·ͨ͠ʂ