Question

如何调试其状态为何为CrashLoopBackOff？

我没有在minisube上使用Aws Kubernetes实例。

我遵循了本教程。 https://github.com/mkjelland/spring-boot-postgres-on-k8s-sample

当我这样做

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并通过

检查状态

  kubectl create -f specs/spring-boot-app.yml

给出

  kubectl get pods

命令下方

     spring-boot-postgres-sample-67f9cbc8c-qnkzg   0/1     CrashLoopBackOff   14         50m

给予

 kubectl describe pods spring-boot-postgres-sample-67f9cbc8c-qnkzg

命令 kubectl get pods --all-namespaces 提供

Events:
  Type     Reason   Age                    From                      Message
  ----     ------   ----                   ----                      -------
  Warning  BackOff  3m18s (x350 over 78m)  kubelet, ip-172-31-11-87  Back-off restarting failed container

命令 kubectl记录spring-boot-postgres-sample-667f87cf4c-858rx 什么都不打印。

Answer 1

首先，我通过postgres部署修复了“ pod具有未绑定的PersistentVolumeClaims”错误，因此我通过这篇文章修复了该错误 pod has unbound PersistentVolumeClaims

现在我的postgres部署正在运行。

kubectl记录spring-boot-postgres-sample-67f9cbc8c-qnkzg 不会输出任何内容，这意味着配置文件中有问题。 kubectl描述了pod spring-boot-postgres-sample-67f9cbc8c-qnkzg ，指出容器已终止且原因已完成，我通过运行容器无限时间来修复它通过添加

   # Just sleep forever
command: [ "sleep" ]
args: [ "infinity" ]

因此，现在我的部署正在运行。但是现在我通过

公开了我的服务

kubectl expose deployment spring-boot-postgres-sample --type=LoadBalancer --port=8080

但是无法获取External-Ip，所以我做到了

kubectl patch svc <svc-name> -n <namespace> -p '{"spec": {"type": "LoadBalancer", "externalIPs":["172.31.71.218"]}}'

所以我得到的外部IP为“ 172.31.71.218”

但是现在的问题是卷曲http://172.31.71.218:8080/超时了

我做错了什么吗？

这是我的部署文件。yml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: spring-boot-postgres-sample
  namespace: default
spec:
  replicas: 1
  template:
    metadata:
      name: spring-boot-postgres-sample
      labels:
        app: spring-boot-postgres-sample
    spec:
      containers:
      - name: spring-boot-postgres-sample
        command: [ "/bin/bash", "-ce", "tail -f /dev/null" ]
        env:
          - name: POSTGRES_USER
            valueFrom:
              configMapKeyRef:
                name: postgres-config
                key: postgres_user
          - name: POSTGRES_PASSWORD
            valueFrom:
              configMapKeyRef:
                name: postgres-config
                key: postgres_password
          - name: POSTGRES_HOST
            valueFrom:
              configMapKeyRef:
                name: hostname-config
                key: postgres_host
        image: <mydockerHUbaccount>/spring-boot-postgres-on-k8s:v1

这是我的postgres.yml

apiVersion: v1
kind: ConfigMap
metadata:
  name: postgres-config
  namespace: default
data:
  postgres_user: postgresuser
  postgres_password: password
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: postgres
spec:
  template:
    metadata:
      labels:
        app: postgres
    spec:
      volumes:
        - name: postgres-storage
          persistentVolumeClaim:
            claimName: postgres-pv-claim
      containers:
        - image: postgres
          name: postgres
          env:
            - name: POSTGRES_USER
              valueFrom:
                configMapKeyRef:
                  name: postgres-config
                  key: postgres_user
            - name: POSTGRES_PASSWORD
              valueFrom:
                configMapKeyRef:
                  name: postgres-config
                  key: postgres_password
            - name: PGDATA
              value: /var/lib/postgresql/data/pgdata
          ports:
            - containerPort: 5432
              name: postgres
          volumeMounts:
            - name: postgres-storage
              mountPath: /var/lib/postgresql/data
---
apiVersion: v1
kind: Service
metadata:
  name: postgres
spec:
  type: ClusterIP
  ports:
    - port: 5432
  selector:
    app: postgres

这是我如何获取主机配置图

kubectl create configmap hostname-config --from-literal=postgres_host=$(kubectl get svc postgres -o jsonpath="{.spec.clusterIP}")

Answer 2

我能够重现该场景。应用程序和Postgres DB之间似乎存在连接问题。因此该应用无法启动。请在下面找到日志，这可能会对您有所帮助。

$ kubectl get po
NAME                                           READY     STATUS             RESTARTS   AGE
spring-boot-postgres-sample-5d7c85d98b-qwvjr   0/1       CrashLoopBackOff   19         1h


org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]

2019-05-23 10:53:01.889 ERROR 1 --- [           main] o.a.tomcat.jdbc.pool.ConnectionPool      : Unable to create initial connections of pool.

org.postgresql.util.PSQLException: Connection to :5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:262) ~[postgresql-9.4.1212.jre7.jar!/:9.4.1212.jre7]
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:51) ~[postgresql-9.4.1212.jre7.jar!/:9.4.1212.jre7]

Answer 3

你为什么不...

运行一个虚拟容器（运行无尽的睡眠命令）
kubectl exec -it bash
直接运行该程序，然后直接查看日志。

这是在K8上进行调试的一种简便形式。

获取“ CrashLoopBackOff”作为已部署吊舱的状态

3 个答案: