I have a minimalist app with spring boot 3.1.1 and spring cloud 2022.0.4, on EKS with kubernetes 1.27, but unfortunately the config is never loaded from the ConfigMap ...
The app is made of a single file without any configuration or application.yaml to serve content from static resources:
package ch.brw.hive.frontend
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication
@SpringBootApplication
class App
fun main(args: Array<String>) {
runApplication<App>(*args)
}
My gradle project name is spring-boot-frontend and the build.gradle.kts is:
...
springBoot {
buildInfo()
}
...
implementation("org.springframework.cloud:spring-cloud-starter-kubernetes-client")
implementation("org.springframework.cloud:spring-cloud-starter-kubernetes-client-config")
implementation("org.springframework.cloud:spring-cloud-starter-kubernetes-client-all")
...
My deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: "spring-boot-frontend"
spec:
replicas: 1
strategy:
type: RollingUpdate
template:
metadata:
labels:
app: "frontend"
spec:
containers:
- name: "spring-boot-frontend"
image: "{{ .Values.frontend.image.registry }}/{{ .Values.frontend.image.name }}:{{ .Values.frontend.image.tag }}"
imagePullPolicy: {{ .Values.frontend.image.pullPolicy | quote }}
ports:
- name: http
containerPort: 8080
resources:
{{- toYaml .Values.frontend.resources | nindent 12 }}
restartPolicy: Always
selector:
matchLabels:
app: "frontend"
My configMap.yaml:
apiVersion: v1
kind: ConfigMap
metadata:
name: "spring-boot-frontend"
data:
application.yaml: |-
server:
port: 8181
My role.yaml:
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: {{ .Values.fullyQualifiedName }}
rules:
- apiGroups: [""]
resources: ["*"]
verbs: ["*"]
My roleBinding.yaml (I use the default service account):
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: {{ .Values.fullyQualifiedName }}
subjects:
- kind: ServiceAccount
name: default
namespace: {{ .Release.Namespace }}
roleRef:
kind: Role
name: {{ .Values.fullyQualifiedName }}
apiGroup: ""
The log does not show any error:
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v3.1.1)
2023-08-31T19:54:27.718Z INFO 1 --- [ main] ch.brw.hive.frontend.AppKt : Starting AppKt using Java 17.0.8 with PID 1 (/app/classes started by root in /)
2023-08-31T19:54:27.720Z INFO 1 --- [ main] ch.brw.hive.frontend.AppKt : The following 1 profile is active: "kubernetes"
2023-08-31T19:54:29.061Z INFO 1 --- [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=3d87bae4-72a0-3c9a-ad7b-c5d752a70bf4
2023-08-31T19:54:29.381Z INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2023-08-31T19:54:29.391Z INFO 1 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2023-08-31T19:54:29.392Z INFO 1 --- [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.10]
2023-08-31T19:54:29.476Z INFO 1 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2023-08-31T19:54:29.479Z INFO 1 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1674 ms
2023-08-31T19:54:30.075Z INFO 1 --- [ main] o.s.c.k.client.KubernetesClientUtils : Created API client in the cluster.
2023-08-31T19:54:30.308Z INFO 1 --- [ler-V1Endpoints] i.k.client.informer.cache.Controller : informer#Controller: ready to run resync & reflector runnable
2023-08-31T19:54:30.308Z INFO 1 --- [ler-V1Endpoints] i.k.client.informer.cache.Controller : informer#Controller: resync skipped due to 0 full resync period
2023-08-31T19:54:30.310Z INFO 1 --- [s.V1Endpoints-1] i.k.c.informer.cache.ReflectorRunnable : class io.kubernetes.client.openapi.models.V1Endpoints#Start listing and watching...
2023-08-31T19:54:30.342Z INFO 1 --- [els.V1Service-1] i.k.c.informer.cache.ReflectorRunnable : class io.kubernetes.client.openapi.models.V1Service#Start listing and watching...
2023-08-31T19:54:31.308Z INFO 1 --- [pool-9-thread-1] s.c.k.c.d.KubernetesDiscoveryClientUtils : Waiting for the cache of informers to be fully loaded..
2023-08-31T19:54:31.309Z INFO 1 --- [ main] s.c.k.c.d.KubernetesDiscoveryClientUtils : Cache fully loaded (total 3 services), discovery client is now available
2023-08-31T19:54:31.464Z INFO 1 --- [ main] o.s.b.a.e.web.EndpointLinksResolver : Exposing 1 endpoint(s) beneath base path '/actuator'
2023-08-31T19:54:31.539Z INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2023-08-31T19:54:31.564Z INFO 1 --- [ main] ch.brw.hive.frontend.AppKt : Started AppKt in 4.674 seconds (process running for 5.105)
As you can see the port is never changed to 8181, which should be the case the the application.yaml was loaded properly.
I was reading the doc again and again:
Does anyone have any ideas about what I am missing ?
I managed to make it work by adding in my deployment.yaml:
args: [
"--spring.cloud.bootstrap.enabled=true"
"--spring.cloud.kubernetes.config.name=spring-boot-frontend",
"--spring.cloud.kubernetes.config.namespace={{ .Release.Namespace }}"
]
This was poorly documented ...