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[英]Can't connect spring boot to postgres k8s statefulset
[英]how does spring boot connect localhost mysql in k8s?
我是 k8s 的新手,使用 docker-mac-desktop k8s 測試 spring boot 應用程序。
在本地連接mysql時,我可以在spring boot時連接成功。
轉換為 docker k8s 無法連接。
錯誤是:
com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:197) ~[mysql-connector-java-8.0.19.jar!/:8.0.19]
是本地監聽端口:
redis-ser 2008 f 6u IPv4 0x135c39363e412e7f 0t0 TCP 127.0.0.1:6379 (LISTEN)
kubectl 2909 f 7u IPv4 0x135c39365cf8a6ff 0t0 TCP 127.0.0.1:8500 (LISTEN)
kubectl 2909 f 8u IPv6 0x135c39365e7fb2cf 0t0 TCP [::1]:8500 (LISTEN)
mysqld 4091 f 28u IPv4 0x135c39364db92abf 0t0 TCP 127.0.0.1:3306 (LISTEN)
mysqld 4091 f 32u IPv4 0x135c39364dc7e6ff 0t0 TCP 127.0.0.1:33060 (LISTEN)
com.docke 41823 f 20u IPv4 0x135c39365b9a4d1f 0t0 TCP 127.0.0.1:6443 (LISTEN)
com.docke 41823 f 25u IPv6 0x135c39365e7f9a4f 0t0 TCP *:32003 (LISTEN)
com.docke 41926 f 8u IPv4 0x135c393660b3785f 0t0 TCP 127.0.0.1:60701 (LISTEN)
spring boot 數據庫配置:
spring:
datasource:
url: jdbc:mysql://mysqldb:3306/foo
# mysqldb.default.svc.cluster.local tried
#
driver-class-name: com.mysql.cj.jdbc.Driver
username: f
彈簧引導 pod.yml:
apiVersion: v1
kind: Pod
metadata:
name: user-service
labels:
app: user-service
spec:
containers:
- name: user-service
image: user_service:v1
地圖數據庫參考: https : //cloud.google.com/blog/products/gcp/kubernetes-best-practices-mapping-external-services
mysql_svc.yml:
apiVersion: v1
kind: Service
metadata:
name: mysqldb
spec:
ports:
- port: 3306
targetPort: 3306
---
kind: Endpoints
apiVersion: v1
metadata:
name: mysqldb
subsets:
- addresses:
- ip: 192.168.0.101
ports:
- port: 3306
而ip來自ifconfig
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=400<CHANNEL_IO>
inet6 fe80::c2c:cc27:8121:fbac%en0 prefixlen 64 secured scopeid 0x5
inet 192.168.0.101 netmask 0xffffff00 broadcast 192.168.0.255
nd6 options=201<PERFORMNUD,DAD>
media: autoselect
status: active
如何從 k8s pod 連接 localhost 數據庫? :)
我解決了這個問題。
更改了 mysql_svc.yml
apiVersion: v1
kind: Service
metadata:
name: mysqldb
spec:
type: ExternalName
externalName: host.docker.internal
ports:
- port: 3306
targetPort: 3306
映射本地端口
更改數據源配置:
spring.datasource.url=jdbc:mysql://mysqldb/foo
然后連接成功。
參考答案
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