Kubernetes Pod 上的 CrashloopBackOff（在 GCP 和 Jenkins 上）

Question

我的 pod 处于 "CrashloopBackOff" 状态，设置为 Jenkins with Kubernetes on GCP。

我找到了几个answers where it indicates that my Dockerfile is not good and that it needs to be in an infinite state。

但我在 production.yaml ["sh", "-c", "app -port=8080"] 中运行命令使其处于该状态。

使用了完全相同的 Dockerfile，当我手动将项目部署到 kubernetes 时它正在工作。

我尝试提交的项目如下所示：

---

Dockerfile

FROM php:7.2.4-apache

COPY apache_default /etc/apache2/sites-available/000-default.conf
RUN a2enmod rewrite

COPY src /var/www/html/src
COPY public /var/www/html/public
COPY config /var/www/html/config
ADD composer.json /var/www/html
ADD composer.lock /var/www/html

# Install software
RUN apt-get update && apt-get install -y git
# Install unzip
RUN apt-get install -y unzip
# Install curl
RUN apt-get install -y curl

# Install dependencies
RUN php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/bin/ --filename=composer

RUN cd /var/www/html && composer install --no-dev --no-interaction --optimize-autoloader
# install pdo for mysql
RUN docker-php-ext-install pdo pdo_mysql

COPY "memory-limit-php.ini" "/usr/local/etc/php/conf.d/memory-limit-php.ini"

RUN chmod 777 -R /var/www

# Production envivorment
ENV ENVIVORMENT=prod  

EXPOSE 80

CMD apachectl -D FOREGROUND

CMD ["app"]

---

Jenkins 文件

def project = '****'
def  appName = 'wobbl-mobile-backend'
def  imageTag = "gcr.io/${project}/${appName}"
def  feSvcName = "wobbl-main-backend-service"

pipeline {
  agent {
    kubernetes {
      label 'sample-app'
      defaultContainer 'jnlp'
      yamlFile 'k8s/pod/pod.yaml'
  }
  }
  stages {
    // Deploy Image and push with image container builder
    stage('Build and push image with Container Builder') {
      steps {
        container('gcloud') {
          sh "PYTHONUNBUFFERED=1 gcloud container builds submit -t ${imageTag} ."
        }
      }
    }
    // Deploy to production
    stage('Deploy Production') {
      // Production branch
      steps{
        container('kubectl') {
        // Change deployed image in canary to the one we just built
          sh("sed -i.bak 's#gcr.io/cloud-solutions-images/wobbl-main:1.0.0#${imageTag}#' ./k8s/production/*.yaml")
          sh("kubectl --namespace=production apply -f k8s/services/")
          sh("kubectl --namespace=production apply -f k8s/production/")
          sh("echo http://`kubectl --namespace=production get service/${feSvcName} -o jsonpath='{.status.loadBalancer.ingress[0].ip}'` > ${feSvcName}")
        }
      }
    }
  }
}

比 yaml kubernetes 配置：

pod.yaml

apiVersion: v1
kind: Pod
metadata:
labels:
  component: ci
spec:
  # Use service account that can deploy to all namespaces
  serviceAccountName: default
  containers:
  - name: gcloud
    image: gcr.io/cloud-builders/gcloud
    command:
    - cat
    tty: true
  - name: kubectl
    image: gcr.io/cloud-builders/kubectl
    command:
    - cat
    tty: true

使用的服务 backend.yaml

kind: Service
apiVersion: v1
metadata:
  name: wobbl-main-backend-service
spec:
  ports:
  - name: http
    port: 8080
    targetPort: 8080
    protocol: TCP
  selector:
    role: backend
    app: wobbl-main

部署production.yaml

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: wobbl-main-backend-production
spec:
  replicas: 1
  template:
    metadata:
      name: backend
      labels:
        app: wobbl-main
        role: backend
        env: production
    spec:
      containers:
      - name: backend
        image: gcr.io/cloud-solutions-images/wobbl-main:1.0.0
        resources:
          limits:
            memory: "500Mi"
            cpu: "100m"
        imagePullPolicy: Always
        readinessProbe:
          httpGet:
            path: /healthz
            port: 8080
        command: ["sh", "-c", "app -port=8080"]
        ports:
        - name: backend
          containerPort: 8080

---

当我运行 kubernetes describe pod **** -n production 时，我得到以下响应：

Normal Created 3m (x4 over 4m) kubelet, gke-jenkins-cd-default-pool-83e2f18e-hvwp 创建容器 正常 开始 3m (x4 over 4m) kubelet, gke-jenkins-cd-default-pool-83e2f18e-hvwp 启动容器警告 BackOff 2m (x8 over 4m) kubelet, gke-jenkins-cd-default-pool-83e2f18e-hvwp 后退重启失败 容器

关于如何调试的任何提示？

Answer 1

首先你的 Docker 文件说：

CMD ["app"]

然后在您的部署定义中：

command: ["sh", "-c", "app -port=8080"]

这是重复。我建议您使用其中之一。

其次，我假设install 命令之一为您提供app 二进制文件。确保它是您的 $PATH

的一部分

此外，您还有一个 pod 和一个部署清单。我希望您使用其中任何一个而不是同时部署两者。