I have a problem with fabric8io kubernetes-client using.
What i want: Creating Kafka cluster with Strimzi operator in Kubernetes. If i do all steps from Strimzi quickstart guide with CLI and kubectl it's all good.
But when i load yaml resources with kubernetes-client:5.2.1 library from Java code, there is an Exception occurs:
io.fabric8.kubernetes.client.KubernetesClientException: An error has occurred.
at io.fabric8.kubernetes.client.KubernetesClientException.launderThrowable(KubernetesClientException.java:64)
at io.fabric8.kubernetes.client.KubernetesClientException.launderThrowable(KubernetesClientException.java:53)
at io.fabric8.kubernetes.client.utils.Serialization.unmarshal(Serialization.java:140)
at io.fabric8.kubernetes.client.utils.Serialization.unmarshal(Serialization.java:101)
at io.fabric8.kubernetes.client.dsl.internal.NamespaceVisitFromServerGetWatchDeleteRecreateWaitApplicableListImpl.<init>(NamespaceVisitFromServerGetWatchDeleteRecreateWaitApplicableListImpl.java:272)
at io.fabric8.kubernetes.client.dsl.internal.NamespaceVisitFromServerGetWatchDeleteRecreateWaitApplicableListImpl.<init>(NamespaceVisitFromServerGetWatchDeleteRecreateWaitApplicableListImpl.java:252)
at io.fabric8.kubernetes.client.DefaultKubernetesClient$1.<init>(DefaultKubernetesClient.java:175)
at io.fabric8.kubernetes.client.DefaultKubernetesClient.load(DefaultKubernetesClient.java:175)
at app.test.main(test.java:38)
Caused by: com.fasterxml.jackson.databind.JsonMappingException: No resource type found for:kafka.strimzi.io/v1#Kafka
at [Source: (String)"{"apiVersion":"kafka.strimzi.io/v1","kind":"Kafka","metadata":{"name":"my-cluster"},"spec":{"kafka":{"replicas":1,"listeners":[{"name":"plain","port":9092,"type":"internal","tls":false},{"name":"tls","port":9093,"type":"internal","tls":true,"authentication":{"type":"tls"}},{"name":"external","port":9094,"type":"nodeport","tls":false}],"storage":{"type":"jbod","volumes":[{"id":0,"type":"persistent-claim","size":"1Gi","deleteClaim":false}]},"config":{"offsets.topic.replication.factor":1,"transacti"[truncated 226 chars]; line: 1, column: 726]Problem occurs when i load this file: yaml config.
I load resource like:
KubernetesClient client = new DefaultKubernetesClient();
InputStream is = ...;
client.load(is).inNamespace("my_namespace").createOrReplace();Please help me!
P.S: And sorry for my English.
I'm from Fabric8 team. Kafka is a Custom Resource which means it's model is not registered in KubernetesClient so this is the reason why you're facing No resource type found for:kafka.strimzi.io/v1#Kafka error from KubenetesClient. KubernetesClient provides two methods for dealing with Custom Resources:
I'll provide examples of using both APIs to load your Kafka yaml fragment.
Typeless API:
For Typeless API you would need to provide a CustomResourceDefinitionContext, an object with details of CustomResource group, version, kind, plural etc. Here is how it would look like:
KafkaLoadTypeless.java
try (KubernetesClient client = new DefaultKubernetesClient()) {
CustomResourceDefinitionContext context = new CustomResourceDefinitionContext.Builder()
.withScope("Namespaced")
.withVersion("v1beta2")
.withGroup("kafka.strimzi.io")
.withPlural("kafkas")
.build();
InputStream is = KafkaLoadTypeles.class.getResourceAsStream("/test-kafka.yml");
Map<String, Object> createdKafka = client.customResource(context).inNamespace("default").createOrReplace(is);
} catch (IOException ioException) {
ioException.printStackTrace();
}
Typed API:
For typed API, you would need to provide types for Kafka resource. You can find these types in Strimzi API dependency. I had to add this dependency in my project in order to use Kafka classes:
<dependency>
<groupId>io.strimzi</groupId>
<artifactId>api</artifactId>
<version>0.22.0</version>
<exclusions>
<exclusion>
<groupId>io.fabric8</groupId>
<artifactId>kubernetes-client</artifactId>
</exclusion>
</exclusions>
</dependency>After adding this, I was able to use Typed API like this: KafkaLoadTyped.java
try (KubernetesClient client = new DefaultKubernetesClient()) {
MixedOperation<Kafka, KafkaList, Resource<Kafka>> kafkaClient = client.customResources(Kafka.class, KafkaList.class);
InputStream is = KafkaLoadTyped.class.getResourceAsStream("/test-kafka.yml");
Kafka myClusterkafka = kafkaClient.load(is).get();
kafkaClient.inNamespace("default").createOrReplace(myClusterkafka);
}