無法從Kubernetes Pod內部連接到外部數據庫(Cannot connecto to external database from inside kubernetes pod)
1101 2020-08-11 IT屋
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我正在嘗試將kubernetes pod中的spring-boot api連接到外部數據庫(單獨的機器，但是在本地網絡中)，但是在運行時，我得到SQLNonTransientConnectionException，UknownHostException:mysql-svc，該api無法連接到數據庫，但是每當我使用kubectl exec -it從pod內部ping主機中的數據庫地址時，我都能成功ping到任何遇到與我相同的錯誤的人嗎?
這是我的application.properties連接uri和kubernetes對象:
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
解決方案
經過數小時的挖掘和重新配置，終於可以正常工作了，這要歸功於kubernetes組的Xenwar指出了externalIP屬性，事實證明我需要將我的應用程序指向外部ip(在本例中為數據庫)，這是服務對象:
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
解決方案
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