kubernetes - java.net.UnknownHostException:postgres

Question

我正在尝试在kubernetes上部署spring boot应用程序并连接到本地主机上的postgres。

Spring Boot部署很好。
对于postgres我做了

kind: Service
apiVersion: v1
metadata:
  name: postgres
  namespace: default
spec:
  type: ExternalName
  # https://docs.docker.com/docker-for-mac/networking/#use-cases-and-workarounds
  externalName: host.docker.internal
  ports:
    - name: port
      port: 5432

kubectl get svc 给

postgres           ExternalName   <none>           host.docker.internal   5432/TCP         9m13s

我是数据库URL

jdbc:postgresql://postgres:5432/postgres

所以Spring Boot部署的日志给出了异常

 java.net.UnknownHostException: postgres

Answer 1

此功能仅适用于Mac和Win Docker，因此，如果您在Linux上运行它-将无法使用。

Linux已支持此主机名，并且可能在接下来的几天/几周内提供:docker/libnetwork#2348

仍然有一些解决方法，但尚未针对Linux发布

I.
您可以在项目中使用以下内容创建一个名为.ddev / docker-compose.xdebug.yaml的文件:

# For Linux users; Docker has not yet supported the "host.docker.internal"
# convention that is used in ddev v0.18.0. But if you add this file as
# .ddev/docker-compose.xdebug.yaml it should sort that out.
# Note that the IP address in your environment might not be 172.17.0.1,
# Find out what address to use with "ifconfig docker0" or "ip addr show docker0 | grep inet"
version: "3"
services:
  web:
    extra_hosts:
      # Find out what address to use with "ifconfig docker0" or "ip addr show docker0 | grep inet"
      - "host.docker.internal:172.17.0.1"

II。
使用此image将TCP和UDP流量转发到Docker主机