01 调试步骤
要远程调试运行在 Kubernetes 容器中的 Java 应用，可以使用以下步骤：
step1: 在部署容器的 Kubernetes YAML 文件中，为容器添加远程调试的 JVM 参数，如：
env:
- name: JAVA_TOOL_OPTIONS
value: -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005step2: 在容器内运行的 Java 应用启动时，会自动开启一个监听 5005 端口的调试服务，可以使用远程调试工具（如 IntelliJ IDEA、Eclipse 等）连接到该端口进行调试。
step3: 如果应用运行在 Kubernetes 集群内部，则可以使用 Kubernetes 的端口转发功能，将容器内部的调试端口转发到本地端口上，如：
kubectl port-forward pod-name 5005:5005其中，pod-name 是要进行调试的容器名称或 ID。
step4: 在本地的远程调试工具中，设置连接到转发后的本地端口进行调试。
注意：在进行远程调试时，需要注意容器内部和外部的 IP 地址和端口的映射关系，以及安全性等问题。
02 案例配置
2.1 deployment配置
某应用deployment完整配置文件（有3个容器，其中appmanager容器的debugger端口为8888，gateway容器的的debugger端口为8899）：
apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: "8"
meta.helm.sh/release-name: vvp
meta.helm.sh/release-namespace: vvp
generation: 8
labels:
app: vvp-ververica-platform
name: vvp-ververica-platform
namespace: vvp
spec:
progressDeadlineSeconds: 600
replicas: 1
revisionHistoryLimit: 10
selector:
matchLabels:
app: vvp-ververica-platform
component: ververica-platform
release: vvp
system: ververica-platform
strategy:
type: Recreate
template:
metadata:
labels:
app: vvp-ververica-platform
component: ververica-platform
release: vvp
system: ververica-platform
spec:
containers:
- env:
- name: spring.profiles.active
value: prod,prod-user
- name: spring.config.additional-location
value: file:/vvp/etc/
- name: JAVA_TOOL_OPTIONS
value: -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:8888
image: registry.ververica.com/v2.9/vvp-appmanager:2.9.1
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 3
httpGet:
path: /actuator/health
port: management
scheme: HTTP
initialDelaySeconds: 90
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 10
name: appmanager
ports:
- containerPort: 9080
name: http
protocol: TCP
- containerPort: 9081
name: management
protocol: TCP
- containerPort: 8888
name: debug
protocol: TCP
readinessProbe:
failureThreshold: 3
httpGet:
path: /actuator/health
port: management
scheme: HTTP
initialDelaySeconds: 10
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 10
resources:
limits:
cpu: "1"
memory: 1Gi
requests:
cpu: 250m
memory: 1Gi
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /vvp/etc
name: config
readOnly: true
- mountPath: /vvp/secrets/blob-storage-creds
name: blob-storage-creds
readOnly: true
- mountPath: /vvp/data
name: data
- env:
- name: spring.profiles.active
value: prod,prod-defaults,prod-user
- name: spring.config.additional-location
value: file:/vvp/etc/
- name: JAVA_TOOL_OPTIONS
value: -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:8899
image: registry.ververica.com/v2.9/vvp-gateway:2.9.1
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 3
httpGet:
path: /actuator/health
port: management
scheme: HTTP
initialDelaySeconds: 90
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
name: gateway
ports:
- containerPort: 8080
name: http
protocol: TCP
- containerPort: 8081
name: management
protocol: TCP
- containerPort: 8899
name: debug2
protocol: TCP
readinessProbe:
failureThreshold: 3
httpGet:
path: /actuator/health
port: management
scheme: HTTP
initialDelaySeconds: 10
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
resources:
limits:
cpu: "1"
memory: 1Gi
requests:
cpu: 250m
memory: 1Gi
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /vvp/etc
name: config
readOnly: true
- mountPath: /vvp/secrets/blob-storage-creds
name: blob-storage-creds
readOnly: true
- mountPath: /vvp/secrets/saml-creds
name: saml-creds
readOnly: true
- mountPath: /vvp/data
name: data
- image: registry.ververica.com/v2.9/vvp-ui:2.9.1
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 3
httpGet:
path: /
port: http
scheme: HTTP
initialDelaySeconds: 10
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
name: ui
ports:
- containerPort: 4200
name: http
protocol: TCP
readinessProbe:
failureThreshold: 3
httpGet:
path: /
port: http
scheme: HTTP
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
resources:
limits:
cpu: 100m
memory: 32Mi
requests:
cpu: 100m
memory: 32Mi
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
dnsPolicy: ClusterFirst
restartPolicy: Always
schedulerName: default-scheduler
securityContext:
fsGroup: 999
serviceAccount: vvp-ververica-platform
serviceAccountName: vvp-ververica-platform
terminationGracePeriodSeconds: 30
volumes:
- configMap:
defaultMode: 420
name: vvp-ververica-platform-config
name: config
- name: blob-storage-creds
secret:
defaultMode: 420
secretName: vvp-ververica-platform-blob-storage-credentials
- emptyDir: {}
name: saml-creds
- name: data
persistentVolumeClaim:
claimName: vvp-ververica-platform2.2 svc配置
配置svc文件，使得集群外都可以访问：
apiVersion: v1
kind: Service
metadata:
annotations:
meta.helm.sh/release-name: vvp
meta.helm.sh/release-namespace: vvp
labels:
app: vvp-ververica-platform
app.kubernetes.io/managed-by: Helm
chart: ververica-platform-5.5.1
component: ververica-platform
release: vvp
system: ververica-platform
name: vvp-ververica-platform
namespace: vvp
spec:
clusterIP: 10.109.161.91
clusterIPs:
- 10.109.161.91
externalTrafficPolicy: Cluster
internalTrafficPolicy: Cluster
ipFamilies:
- IPv4
ipFamilyPolicy: SingleStack
ports:
- name: http
nodePort: 32621
port: 80
protocol: TCP
targetPort: 8080
- name: debug
nodePort: 31449
port: 8888
protocol: TCP
targetPort: 5005
- name: debug2
nodePort: 31822
port: 8899
protocol: TCP
targetPort: 8899
selector:
app: vvp-ververica-platform
component: ververica-platform
sessionAffinity: None
type: NodePort
status:
loadBalancer:
ingress:
- hostname: localhost2.3 idea配置
开始调试：
03 文末
本文主要讲解如何在本地远程调试k8s容器里面的Java应用，也适合调试第三方的应用，希望能帮助到大家，谢谢大家的阅读，本文完！
