Jenkins Kubernetes 插件不执行 Docker 图像的入口点

Question

一般来说，我对 Jenkins Kubernetes 插件和 Kubernetes 还很陌生 - https://github.com/jenkinsci/kubernetes-plugin

我想在我的 CI 中使用 E2E 测试设置插件。

在我的 Jenkinsfile 中，我有一个 podTemplate，其外观和使用如下：

def podTemplate = """
apiVersion: v1
kind: Pod
spec:
  containers:
  - name: website
    image: ${WEBSITE_INTEGRATION_IMAGE_PATH}
    command:
      - cat
    tty: true
    ports:
     - containerPort: 3000
  - name: cypress
    resources:
      requests:
        memory: 2Gi
      limit:
        memory: 4Gi
    image: ${CYPRESS_IMAGE_PATH}
    command:
      - cat
    tty: true
"""

pipeline {
  agent {
    label 'docker'
  }
  stages {
    stage('Prepare') {
      steps {
        timeout(time: 15) {
          script {
            ci_machine = docker.build("${WEBSITE_IMAGE_PATH}")
          }
        }
      }
    }

    stage('Build') {
      steps {
        timeout(time: 15) {
          script {
            ci_machine.inside("-u root") {
              sh "yarn build"
            }
          }
        }
      }

      post {
        success {
          timeout(time: 15) {
            script {
              docker.withRegistry("https://${REGISTRY}", REGISTRY_CREDENTIALS) {
                integrationImage = docker.build("${WEBSITE_INTEGRATION_IMAGE_PATH}")
                integrationImage.push()
              }
            }
          }
        }
      }
    }

    stage('Browser Tests') {
      agent {
        kubernetes {
          label "${KUBERNETES_LABEL}"
          yaml podTemplate
        }
      }
      steps {
        timeout(time: 5, unit: 'MINUTES') {
          container("website") {
            sh "yarn start"
          }

          container("cypress") {
            sh "yarn test:e2e"
          }
        }
      }
  }
}

在构建图像的 Dockerfile 中，我添加了一个 ENTRYPOINT

ENTRYPOINT ["bash", "./docker-entrypoint.sh"]

不过好像不是kubernetes插件执行的

我是不是漏掉了什么？

Answer 1

根据 Define a Command and Arguments for a Container 文档：

The command and arguments that you define in the configuration file override the default command and arguments provided by the container image.

This table总结了Docker和Kubernetes使用的字段名：

| Docker field name | K8s field name |
|------------------:|:--------------:|
|    ENTRYPOINT     |     command    |
|       CMD         |      args      |

定义 command 意味着忽略您的 Docker 文件 ENTRYPOINT:

When you override the default ENTRYPOINT and CMD, these rules apply:

• If you supply a command but no args for a Container, only the supplied command is used. The default ENTRYPOINT and the default CMD defined in the Docker image are ignored.
• If you supply only args for a Container, the default ENTRYPOINT defined in the Docker image is run with the args that you supplied.

因此，您需要将广告连播模板中的 command 替换为 args，这将保留您的 Docker 文件 ENTRYPOINT（相当于 Docker文件 CMD).