This quickstart run in a Java standalone container, using Spring with Apache Camel (Cassandraql component).
This example is based on:
-
Minikube 1.11.0 (Kubernetes version >= 1.17)
First thing you’ll need to do is to prepare the environment.
Don’t forget to use a bit more memory for your Minikube setup to run this example smoothly:
$ minikube start --memory 5120 --cpus=4Once your Minikube node is up and running you’ll need to run the
following command. In your src/main/resource/jkube/ folder you’ll find
two yaml files. Run the following commands using them to prepare the Cassandra cluster:
$ kubectl create -f src/main/resources/jkube/cassandra-service.yaml $ kubectl create -f src/main/resources/jkube/cassandra-statefulset.yaml
To check the correct startup of the cluster run the following command:
$ kubectl get statefulsets.apps NAME READY AGE cassandra 2/2 3h44m
and check the status of the pods
$ kubectl get pods NAME READY STATUS RESTARTS AGE cassandra-0 1/1 Running 0 2h cassandra-1 1/1 Running 0 2h
You can also verify the health of your cluster by running
$ kubectl exec <pod_name> -it nodetool status Datacenter: DC1-K8Demo ====================== Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address Load Tokens Owns (effective) Host ID Rack UN 172.17.0.4 212.14 KiB 32 53.1% 9bf81ccd-4aa1-451b-b56e-c16c5ee04836 Rack1-K8Demo UN 172.17.0.6 170.08 KiB 32 46.9% 69cc6f60-9ccf-439d-a298-b79b643c1586 Rack1-K8Demo
Navigate to the project folder where the example can be built with
$ mvn clean -Pkubernetes-install k8s:deployWhen the example runs in Kubernetes, you can use the Kubectl command tool to inspect the status
To list all the running pods:
$ kubectl get podsYou can follow the log for the created Pod by running:
$ mvn -Pkubernetes-install k8s:logYou should then see an output similar to this:
[INFO] k8s: 2020-08-07 12:34:32,569 [main ] INFO GuavaCompatibility - Detected Guava >= 19 in the classpath, using modern compatibility layer [INFO] k8s: 2020-08-07 12:34:32,834 [main ] INFO ClockFactory - Using native clock to generate timestamps. [INFO] k8s: 2020-08-07 12:34:33,005 [main ] INFO NettyUtil - Did not find Netty's native epoll transport in the classpath, defaulting to NIO. [INFO] k8s: 2020-08-07 12:34:34,122 [main ] INFO DCAwareRoundRobinPolicy - Using data-center name 'DC1-K8Demo' for DCAwareRoundRobinPolicy (if this is incorrect, please provide the correct datacenter name with DCAwareRoundRobinPolicy constructor) [INFO] k8s: 2020-08-07 12:34:34,124 [main ] INFO Cluster - New Cassandra host cassandra/172.17.0.7:9042 added [INFO] k8s: 2020-08-07 12:34:34,150 [main ] INFO Cluster - New Cassandra host cassandra/172.17.0.6:9042 added [INFO] k8s: 2020-08-07 12:34:36,780 [main ] INFO CqlPopulateBean - Cassandra was populated with sample values for test.users table [INFO] k8s: 2020-08-07 12:34:37,372 [main ] INFO LRUCacheFactory - Detected and using LRUCacheFactory: camel-caffeine-lrucache [INFO] k8s: 2020-08-07 12:34:38,012 [main ] INFO AbstractCamelContext - Apache Camel 3.8.0-SNAPSHOT (camel-1) is starting [INFO] k8s: 2020-08-07 12:34:38,019 [main ] INFO AbstractCamelContext - StreamCaching is not in use. If using streams then its recommended to enable stream caching. See more details at http://camel.apache.org/stream-caching.html [INFO] k8s: 2020-08-07 12:34:38,019 [main ] INFO AbstractCamelContext - Using HealthCheck: camel-health [INFO] k8s: 2020-08-07 12:34:38,664 [main ] INFO DefaultMavenCoordinates - DataStax Java driver for Apache Cassandra(R) (com.datastax.oss:java-driver-core) version 4.8.0 [INFO] k8s: 2020-08-07 12:34:39,554 [s0-admin-0 ] INFO Clock - Using native clock for microsecond precision [INFO] k8s: 2020-08-07 12:34:41,453 [main ] INFO InternalRouteStartupManager - Route: cassandra-route started and consuming from: timer://foo [INFO] k8s: 2020-08-07 12:34:41,454 [main ] INFO AbstractCamelContext - Total 1 routes, of which 1 are started [INFO] k8s: 2020-08-07 12:34:41,455 [main ] INFO AbstractCamelContext - Apache Camel 3.8.0-SNAPSHOT (camel-1) started in 3.441 seconds [INFO] k8s: 2020-08-07 12:34:41,469 [main ] INFO BaseMainSupport - Using properties from: classpath:application.properties;optional=true [INFO] k8s: 2020-08-07 12:34:41,557 [main ] INFO DefaultRoutesCollector - No additional Camel XML routes discovered from: classpath:camel/*.xml [INFO] k8s: 2020-08-07 12:34:41,557 [main ] INFO DefaultRoutesCollector - No additional Camel XML route templates discovered from: classpath:camel-template/*.xml [INFO] k8s: 2020-08-07 12:34:41,559 [main ] INFO DefaultRoutesCollector - No additional Camel XML rests discovered from: classpath:camel-rest/*.xml [INFO] k8s: 2020-08-07 12:34:42,557 [1 - timer://foo] INFO cassandra-route - Query result set [1-oscerd,2-not-a-bot] [INFO] k8s: 2020-08-07 12:34:47,548 [1 - timer://foo] INFO cassandra-route - Query result set [1-oscerd,2-not-a-bot] [INFO] k8s: 2020-08-07 12:34:52,661 [1 - timer://foo] INFO cassandra-route - Query result set [1-oscerd,2-not-a-bot]
Run following to undeploy the application and cassandra nodes
$ mvn -Pkubernetes-install k8s:undeploy $ kubectl delete -f src/main/resources/jkube/cassandra-service.yaml $ kubectl delete -f src/main/resources/jkube/cassandra-statefulset.yaml
Make sure no pod is running
$ kubectl get pods No resources found.
If you hit any problem using Camel or have some feedback, then please let us know.
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The Camel riders!