docker - Kubernetes中Pod上的CrashloopBackOff(在具有Jenkins的GCP上)

Question

我的广告连播处于“CrashloopBackOff” 的状态，设置为Jenkins with Kubernetes on GCP。

我发现了一些answers where it indicates that my Dockerfile is not good and that it needs to be in an infinite state。

但是我在production.yaml中运行命令 [“sh”，“-c”，“app -port = 8080”] 以使其处于该状态。

使用完全相同的 Dockerfile ，当我将项目手动部署到kubernetes时，它可以正常工作。

我要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

该服务使用了 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描述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 Created container Normal Started 3m (x4 over 4m) kubelet, gke-jenkins-cd-default-pool-83e2f18e-hvwp Started container Warning BackOff 2m (x8 over 4m) kubelet, gke-jenkins-cd-default-pool-83e2f18e-hvwp Back-off restarting failed container

关于如何调试的任何提示？

Answer 1

首先，您的Docker文件说:

CMD ["app"]

然后在您的部署定义中，您可以:

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命令之一为您提供了 app二进制文件。确保它是您的 $PATH的一部分

另外，您还有一个Pod和一个部署 list 。我希望您正在使用其中之一，并且不要同时部署两者。