spring-boot - Kubernetes与Spring Boot变量解析冲突

Question

我有一个Kubernetes和spring boot的env变量冲突错误。详细信息如下:

在创建zipkin服务器容器时，我需要设置env变量RABBITMQ_HOST=http://172.16.100.83，RABBITMQ_PORT=5672。

最初，我将zipkin_pod.yaml定义如下:

apiVersion: v1
kind: Pod
metadata:
  name: gearbox-rack-zipkin-server
  labels:
    app: gearbox-rack-zipkin-server
    purpose: platform-demo
spec:
  containers:
  - name:  gearbox-rack-zipkin-server
    image: 192.168.1.229:5000/gearboxrack/gearbox-rack-zipkin-server
    ports:
    - containerPort: 9411
    env:
      - name: EUREKA_SERVER
        value: http://172.16.100.83:31501
      - name: RABBITMQ_HOST
        value: http://172.16.100.83
      - name: RABBITMQ_PORT
        value: 31503

使用此配置，当我执行命令时

kubectl apply -f zipkin_pod.yaml

控制台抛出错误:

[root@master3 sup]# kubectl apply -f zipkin_pod.yaml
Error from server (BadRequest): error when creating "zipkin_pod.yaml": Pod in version "v1" cannot be handled as a Pod: v1.Pod: Spec: v1.PodSpec: Containers: []v1.Container: v1.Container: Env: []v1.EnvVar: v1.EnvVar: Value: ReadString: expects " or n, parsing 1018 ...,"value":3... at {"apiVersion":"v1","kind":"Pod","metadata":{"annotations":{"kubectl.kubernetes.io/last-applied-configuration":"{\"apiVersion\":\"v1\",\"kind\":\"Pod\",\"metadata\":{\"annotations\":{},\"labels\":{\"app\":\"gearbox-rack-zipkin-server\",\"purpose\":\"platform-demo\"},\"name\":\"gearbox-rack-zipkin-server\",\"namespace\":\"default\"},\"spec\":{\"containers\":[{\"env\":[{\"name\":\"EUREKA_SERVER\",\"value\":\"http://172.16.100.83:31501\"},{\"name\":\"RABBITMQ_HOST\",\"value\":\"http://172.16.100.83\"},{\"name\":\"RABBITMQ_PORT\",\"value\":31503}],\"image\":\"192.168.1.229:5000/gearboxrack/gearbox-rack-zipkin-server\",\"name\":\"gearbox-rack-zipkin-server\",\"ports\":[{\"containerPort\":9411}]}]}}\n"},"labels":{"app":"gearbox-rack-zipkin-server","purpose":"platform-demo"},"name":"gearbox-rack-zipkin-server","namespace":"default"},"spec":{"containers":[{"env":[{"name":"EUREKA_SERVER","value":"http://172.16.100.83:31501"},{"name":"RABBITMQ_HOST","value":"http://172.16.100.83"},{"name":"RABBITMQ_PORT","value":31503}],"image":"192.168.1.229:5000/gearboxrack/gearbox-rack-zipkin-server","name":"gearbox-rack-zipkin-server","ports":[{"containerPort":9411}]}]}}

因此，我对zipkin_pod.yaml文件的最后一行进行了如下修改:或使用强力将端口号设置为int。

apiVersion: v1
kind: Pod
metadata:
  name: gearbox-rack-zipkin-server
  labels:
    app: gearbox-rack-zipkin-server
    purpose: platform-demo
spec:
  containers:
  - name:  gearbox-rack-zipkin-server
    image: 192.168.1.229:5000/gearboxrack/gearbox-rack-zipkin-server
    ports:
    - containerPort: 9411
    env:
      - name: EUREKA_SERVER
        value: http://172.16.100.83:31501
      - name: RABBITMQ_HOST
        value: http://172.16.100.83
      - name: RABBITMQ_PORT
        value: !!31503

然后成功创建了pod，但是spring getProperties抛出异常。

[root@master3 sup]# kubectl apply -f zipkin_pod.yaml
pod "gearbox-rack-zipkin-server" created

当我检查日志时:

[root@master3 sup]# kubectl logs gearbox-rack-zipkin-server
2018-05-28 07:56:26.792  INFO [zipkin-server,,,] 1 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@4ac68d3e: startup date [Mon May 28 07:56:26 UTC 2018]; root of context hierarchy

...

***************************
APPLICATION FAILED TO START
***************************
Description:
Binding to target org.springframework.boot.autoconfigure.amqp.RabbitProperties@324c64cd failed:
    Property: spring.rabbitmq.port
    Value:
    Reason: Failed to convert property value of type 'java.lang.String' to required type 'int' for property 'port'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.String] to type [int]
Action:
Update your application's configuration

我的问题是如何让kubernetes将端口号理解为int，同时又不破坏spring boot将规则从字符串转换为int的方式？因为Spring Boot无法转换 !!31503 to int 31503。

Answer 1

正如@Bal Chua和@PärNilsson提到的，对于环境变量，您只能使用字符串变量，因为Linux环境变量只能是字符串。

因此，如果使用yaml，则需要将值放在引号中以强制Kubernetes使用字符串。

例如:

- name: RABBITMQ_PORT
  value: '31503'