SpringBoot could not access ElasticSearch on kubernetes
Spring Boot access ElasticSearch Problem on kubernetes Problem
If ElasticSearch installed locally then Spring Boot Application can access it via spring.data.elasticsearch.cluster-nodes=localhost:9300
But when both of them installed on K8s, SpringBoot could not access it anymore
the deployment yaml of spring boot is like below
apiVersion: apps/v1
kind: Deployment
metadata:
name: springbootelastic
spec:
selector:
matchLabels:
run: springbootelastic
replicas: 1
template:
metadata:
labels:
run: springbootelastic
spec:
containers:
- name: springbootelastic
image: wangyan100/springbootelastic:latest
imagePullPolicy: Always
env:
- name: CLUSTER_NODES
value: elasticsearch:9300
- name: CLUSTER_HOST
value: elasticsearch
#imagePullSecrets:
# - name: regcredall yaml files and code you could find it at https://github.com/wangyan100/springbootexamples/tree/master/spring-boot-elasticsearch/src
The exception I got at spring boot 's pod log is as below shown
: Adding transport node : 10.108.175.123:9300 not part of the cluster Cluster [elasticsearch], ignoring...
: failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{RwIDGzHOQFqU1Lrl0yULkQ}{elasticsearch}{10.108.175.123:9300}]
elasticsearch running on pod, I could browser it via http://192.168.99.113:31183 (31183 is nodeport )
{
"name" : "c97xU38",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "3FQq0XXeQjuzDRqXO2wY6w",
"version" : {
"number" : "6.4.3",
"build_flavor" : "default",
"build_type" : "tar",
"build_hash" : "fe40335",
"build_date" : "2018-10-30T23:17:19.084789Z",
"build_snapshot" : false,
"lucene_version" : "7.4.0",
"minimum_wire_compatibility_version" : "5.6.0",
"minimum_index_compatibility_version" : "5.0.0"
},
"tagline" : "You Know, for Search"
}
Similar Questions
2 Answers
Can you verify the output of http://elasticsearch:9200, you should see something like this:
{
"name": "5M3kvCf",
"cluster_name": "docker-cluster",
"cluster_uuid": "tbbXSaIIQhearMZckxpEQQ",
"version": {
"number": "6.2.4",
"build_hash": "ccec39f",
"build_date": "2018-04-12T20:37:28.497551Z",
"build_snapshot": false,
"lucene_version": "7.2.1",
"minimum_wire_compatibility_version": "5.6.0",
"minimum_index_compatibility_version": "5.0.0"
},
"tagline": "You Know, for Search"
}
The cluster name should match with:
spring.data.elasticsearch.cluster-namein your spring configuration.
Problem solved. I wrote it at this link.
Deploy SpringBootApplication and ElasticSearch on Kubernetes
This demo will show you how to deploy SpringBootApplication and ElasticSearch on Kubernetes.
The demo will use the SpringBootApplication from this link.
Build docker image
gradle clean build
docker build -t wangyan100/springbootelastic .
Push docker image (wangyan100/springbootelastic) to docker hub
create wangyan100/springbootelastic as repository at Docker Hub website. Of course, you need register an account at Docker Hub website if you don't have one.
docker login
enter docker hub's username and password.
docker tag <image_id> wangyan100/springbootelastic:latest
docker push wangyan100/springbootelastic:latest
Write deployment and service yaml files
for SpringBootApplication, you could find example as shown below.
for elasticsearch, you could find example as shown below.
Install Kubernetes on your local machine
- Follow the link to install Kubernetes on your local PC.
Deploy Application on Kubernetes
minikube start --memory 4096 (elasticsearch requires 4GB memory).
Deploy elasticsearch.
cd spring-boot-elasticsearch/src/elastick8s kubectl apply -f .Wait until elasticsearch is up and running.
kubectl get pods NAME READY STATUS RESTARTS elasticsearch-5b74bbdd86-wgw2n 1/1 Running 0Deploy SpringBootApplication.
cd spring-boot-elasticsearch/src/springbootk8s kubectl apply -f .Get exposed URL of springboot and elasticsearch.
minikube service springbootelastic --url http://192.168.99.113:31742 minikube service elasticsearch --url http://192.168.99.113:30765 http://192.168.99.113:32663Use postman to send request to SpringBootApplication, it will create an entry at elasticsearch.
Check result, it works.
