[kubernets] Kubernetes 로컬 개발환경 skaffold, Intellij

[kubernetes] 개발환경 목차

ㅁ 개요

 ㅇ [kubernets] skaffold란, Kubernetes 로컬 개발환경에서 skaffold를 알아보았습니다.

 ㅇ skaffold와 Intellij를 연동하여 쿠버네티스 로컬 개발환경 세팅하는 과정을 정리하였습니다.

 ㅇ 궁극적으로 skaffold를 통해 쿠버네티스 환경에서 Debug모드로 프로세스의 흐름을 분석하는 것이다.

 ㅇ skaffold를 구성을 공부하는 과정에서 트러블 슈팅은 여기에 정리되어 있다.

 

ㅁ Spring 샘플 프로젝트 생성

 ㅇ Spring 샘플 프로젝트를 생성하여 해당 프로젝트를 Intellij로 실행하였다.

 ㅇ 참고로 위 이미지는 트러블 슈팅으로 인해 예전에 만든 프로젝트 이름임.

 

 

ㅁ skaffold.yaml 생성

 ㅇ skaffold.yaml를 생성하였다.

 ㅇ jib 설정 및 k8s 파일 경로 추가하였다.

 

 

ㅁ jib 설정

 ㅇ Jib는 Java 애플리케이션용 Docker 이미지를 빌드하기 위한 Gradle 플러그인입니다.

 ㅇ build.gradle 파일 >  plugins >  jib 3.3.0을 추가하였다.

 

 

ㅁ k8s deployment, service 추가

 ㅇ spring-boot-example이라는 deplyment 생성

 ㅇ port는 8080임

 

  ㅇ 접속을 위한 spring-boot-example 서비스 생성.

 

 

ㅁ Skaffold build

 

$ skaffold build
Generating tags...
 - skaffold-spring-boot -> skaffold-spring-boot:6e32d9e-dirty
Checking cache...
 - skaffold-spring-boot: Not found. Building
Starting build...
Found [minikube] context, using local docker daemon.
Building [skaffold-spring-boot]...
> Task :_skaffoldFailIfJibOutOfDate
> Task :compileJava
> Task :processResources UP-TO-DATE
> Task :classes

> Task :jibDockerBuild

Containerizing application to Docker daemon as skaffold-spring-boot:6e32d9e-dirty...
Base image 'eclipse-temurin:11-jre' does not use a specific image digest - build may not be reproducible
Getting manifest for base image eclipse-temurin:11-jre...
Building dependencies layer...
Building resources layer...
Building classes layer...
Building jvm arg files layer...
The base image requires auth. Trying again for eclipse-temurin:11-jre...
The credential helper (docker-credential-desktop) has nothing for server URL: registry-1.docker.io

Got output:

credentials not found in native keychain

The credential helper (docker-credential-desktop) has nothing for server URL: registry.hub.docker.com

Got output:

credentials not found in native keychain

Using credentials from Docker config (/Users/peterseo/.docker/config.json) for eclipse-temurin:11-jre
Using base image with digest: sha256:3ca22aa74f428cd034085bcf6823733f1730dd7ddd813ae0fa986da8a336eeb0

Container entrypoint set to [java, -cp, @/app/jib-classpath-file, com.peterica.skaffoldspringboot.SkaffoldSpringBootApplication]
Loading to Docker daemon...

Built image to Docker daemon as skaffold-spring-boot:6e32d9e-dirty

BUILD SUCCESSFUL in 6s
4 actionable tasks: 3 executed, 1 up-to-date
Build [skaffold-spring-boot] succeeded

 

 

ㅁ Skaffold dev

$ skaffold dev
Listing files to watch...
 - skaffold-spring-boot
Generating tags...
 - skaffold-spring-boot -> skaffold-spring-boot:6e32d9e-dirty
Checking cache...
 - skaffold-spring-boot: Not found. Building
Starting build...
Found [minikube] context, using local docker daemon.
Building [skaffold-spring-boot]...
Target platforms: [linux/amd64]
> Task :_skaffoldFailIfJibOutOfDate
> Task :compileJava UP-TO-DATE
> Task :processResources UP-TO-DATE
> Task :classes UP-TO-DATE

> Task :jibDockerBuild

Containerizing application to Docker daemon as skaffold-spring-boot:6e32d9e-dirty...
Base image 'eclipse-temurin:11-jre' does not use a specific image digest - build may not be reproducible
Getting manifest for base image eclipse-temurin:11-jre...
Building dependencies layer...
Building resources layer...
Building classes layer...
Building jvm arg files layer...
The base image requires auth. Trying again for eclipse-temurin:11-jre...
The credential helper (docker-credential-desktop) has nothing for server URL: registry-1.docker.io

Got output:

credentials not found in native keychain

The credential helper (docker-credential-desktop) has nothing for server URL: registry.hub.docker.com

Got output:

credentials not found in native keychain

Using credentials from Docker config (/Users/peterseo/.docker/config.json) for eclipse-temurin:11-jre
Using base image with digest: sha256:3ca22aa74f428cd034085bcf6823733f1730dd7ddd813ae0fa986da8a336eeb0

Container entrypoint set to [java, -cp, @/app/jib-classpath-file, com.peterica.skaffoldspringboot.SkaffoldSpringBootApplication]
Loading to Docker daemon...

Built image to Docker daemon as skaffold-spring-boot:6e32d9e-dirty

BUILD SUCCESSFUL in 6s
4 actionable tasks: 2 executed, 2 up-to-date
Build [skaffold-spring-boot] succeeded
Tags used in deployment:
 - skaffold-spring-boot -> skaffold-spring-boot:4de8c3487507f2a7bf25b6a6750ae17c250c111d7bfd17fd9d3330f8076aabad
Starting deploy...
 - deployment.apps/spring-boot-example created
 - service/spring-boot-example created
Waiting for deployments to stabilize...
 - deployment/spring-boot-example is ready.
Deployments stabilized in 3.166 seconds
Press Ctrl+C to exit
Watching for changes...
[spring-boot-example]
[spring-boot-example]   .   ____          _            __ _ _
[spring-boot-example]  /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
[spring-boot-example] ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
[spring-boot-example]  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
[spring-boot-example]   '  |____| .__|_| |_|_| |_\__, | / / / /
[spring-boot-example]  =========|_|==============|___/=/_/_/_/
[spring-boot-example]  :: Spring Boot ::               (v2.6.12)
[spring-boot-example]
[spring-boot-example] 2022-09-25 03:15:59.592  INFO 1 --- [           main] c.p.s.SkaffoldSpringBootApplication      : Starting SkaffoldSpringBootApplication using Java 11.0.16.1 on spring-boot-example-67d894d76-65ftz with PID 1 (/app/classes started by root in /)
[spring-boot-example] 2022-09-25 03:15:59.596  INFO 1 --- [           main] c.p.s.SkaffoldSpringBootApplication      : No active profile set, falling back to 1 default profile: "default"
[spring-boot-example] 2022-09-25 03:16:01.021  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
[spring-boot-example] 2022-09-25 03:16:01.042  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
[spring-boot-example] 2022-09-25 03:16:01.043  INFO 1 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.65]
[spring-boot-example] 2022-09-25 03:16:01.190  INFO 1 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
[spring-boot-example] 2022-09-25 03:16:01.190  INFO 1 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1494 ms
[spring-boot-example] 2022-09-25 03:16:02.103  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
[spring-boot-example] 2022-09-25 03:16:02.125  INFO 1 --- [           main] c.p.s.SkaffoldSpringBootApplication      : Started SkaffoldSpringBootApplication in 3.322 seconds (JVM running for 3.936)
[spring-boot-example] 2022-09-25 03:16:55.429  INFO 1 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
[spring-boot-example] 2022-09-25 03:16:55.430  INFO 1 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
[spring-boot-example] 2022-09-25 03:16:55.434  INFO 1 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 3 ms

 ㅇ dev로 하는 경우 바로 Spring 로그를 확인할 수 있다.

 

 

 ㅇ kubectl로 pod의 정상 로딩을 확인하였다.

 

 

ㅁ 접속 확인

 ㅇ minikube 환경이라 service list 확인이 필요하다.

 

 ㅇ 웹을 통해 정상 로딩 확인하였다.

 

 

ㅁ 함께 보면 좋은 사이트

GitHub - GoogleContainerTools/jib: 🏗 Build container images for your Java applications.

 ㅇ jib gradle quick start

 

 

GitHub - TechPrimers/skaffold-spring-boot-example: Skaffold Spring Boot Example

 ㅇ skaffold-spring-boot-example