无法从Kubernetes Pod内部连接到外部数据库(Cannot connecto to external database from inside kubernetes pod)
1101 2020-08-11 IT屋
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我正在尝试将kubernetes pod中的spring-boot api连接到外部数据库(单独的机器，但是在本地网络中)，但是在运行时，我得到SQLNonTransientConnectionException，UknownHostException:mysql-svc，该api无法连接到数据库，但是每当我使用kubectl exec -it从pod内部ping主机中的数据库地址时，我都能成功ping到任何遇到与我相同的错误的人吗?
这是我的application.properties连接uri和kubernetes对象:
spring.datasource.url=jdbc:mysql://mysql-svc/test?autoReconnect=true
---
apiVersion: v1
kind: Service
metadata:
name: mysql-svc
spec:
type: ClusterIP
ports:
- port: 3306
targetPort: 3306
---
apiVersion: v1
kind: Endpoints
metadata:
name: mysql-svc
subsets:
- addresses:
- ip: 10.0.123.28
ports:
- port: 3306
name: mysql-svc
解决方案
经过数小时的挖掘和重新配置，终于可以正常工作了，这要归功于kubernetes组的Xenwar指出了externalIP属性，事实证明我需要将我的应用程序指向外部ip(在本例中为数据库)，这是服务对象:
apiVersion: v1
kind: Service
metadata:
name: db-con
spec:
selector:
app: api2
ports:
- name: http
protocol: TCP
port: 3306
targetPort: 3306
externalIPs:
- 10.0.123.28
原文
I am trying to connect my spring-boot api inside a kubernetes pod to an external database (a separate machine but within the local network), however when running, I get SQLNonTransientConnectionException, UknownHostException: mysql-svc, the api cannot connect to the database but whenever I ping the database address from inside the pod using kubectl exec -it, I can ping it successfully, anybody who has experienced the same error as mine?
here is my application.properties connection uri and kubernetes objects:
spring.datasource.url=jdbc:mysql://mysql-svc/test?autoReconnect=true
---
apiVersion: v1
kind: Service
metadata:
name: mysql-svc
spec:
type: ClusterIP
ports:
- port: 3306
targetPort: 3306
---
apiVersion: v1
kind: Endpoints
metadata:
name: mysql-svc
subsets:
- addresses:
- ip: 10.0.123.28
ports:
- port: 3306
name: mysql-svc
解决方案
After hours of digging and reconfiguring, I finally get it to work, thanks to Xenwar from kubernetes group for pointing out the externalIP property, it turns out that i need to point my app to an external ip, in this case the database, here is the service object:
apiVersion: v1
kind: Service
metadata:
name: db-con
spec:
selector:
app: api2
ports:
- name: http
protocol: TCP
port: 3306
targetPort: 3306
externalIPs:
- 10.0.123.28