Connect Spring with Elasticsearch in Docker - spring

Question

I have to connect my Spring client with Elasticsearch whose image have been taken by the official ES 2.4.6 image that Elastic has in Docker Hub but when I try to run the containers, the Docker console reports me this error:
[Glitch] failed to connect to node
[{#transport#-1}{localhost}{127.0.0.1:9300}], removed from nodes list
The application.properties of my Spring project is:
spring.data.elasticsearch.cluster-nodes=localhost:9300
index.v = default
server.port = 8443
And the docker-compose.yml is:
version: "2.2"
services:
elk:
image: cvazquezlos/elk:2.4.6
ports:
- 5000:5000
- 5601:5601
- 9200:9200
- 9300:9300
volumes:
- elk-data:/var/lib/elasticsearch
testloganalyzer:
image: cvazquezlos/testloganalyzer
ports:
- 8443:8443
volumes:
elk-data:
If I run the backend without Docker it works as expected, but when I run the backend with Docker, reports me the above error. The complete error is:
failed to connect to node [{#transport#-1}{localhost}{127.0.0.1:9300}], removed from nodes list
org.elasticsearch.transport.ConnectTransportException: [][127.0.0.1:9300] connect_timeout[30s]
at org.elasticsearch.transport.netty.NettyTransport.connectToChannelsLight(NettyTransport.java:967) ~[elasticsearch-2.4.6.jar!/:2.4.6]
at org.elasticsearch.transport.netty.NettyTransport.connectToNode(NettyTransport.java:933) ~[elasticsearch-2.4.6.jar!/:2.4.6]
at org.elasticsearch.transport.netty.NettyTransport.connectToNodeLight(NettyTransport.java:906) ~[elasticsearch-2.4.6.jar!/:2.4.6]
at org.elasticsearch.transport.TransportService.connectToNodeLight(TransportService.java:267) ~[elasticsearch-2.4.6.jar!/:2.4.6]
at org.elasticsearch.client.transport.TransportClientNodesService$SimpleNodeSampler.doSample(TransportClientNodesService.java:390) ~[elasticsearch-2.4.6.jar!/:2.4.6]
at org.elasticsearch.client.transport.TransportClientNodesService$NodeSampler.sample(TransportClientNodesService.java:336) [elasticsearch-2.4.6.jar!/:2.4.6]
at org.elasticsearch.client.transport.TransportClientNodesService$ScheduledNodeSampler.run(TransportClientNodesService.java:369) [elasticsearch-2.4.6.jar!/:2.4.6]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_151]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_151]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_151]
Caused by: java.net.ConnectException: Connection refused: localhost/127.0.0.1:9300
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.8.0_151]
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[na:1.8.0_151]
at org.jboss.netty.channel.socket.nio.NioClientBoss.connect(NioClientBoss.java:152) ~[netty-3.10.6.Final.jar!/:na]
at org.jboss.netty.channel.socket.nio.NioClientBoss.processSelectedKeys(NioClientBoss.java:105) ~[netty-3.10.6.Final.jar!/:na]
at org.jboss.netty.channel.socket.nio.NioClientBoss.process(NioClientBoss.java:79) ~[netty-3.10.6.Final.jar!/:na]
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337) ~[netty-3.10.6.Final.jar!/:na]
at org.jboss.netty.channel.socket.nio.NioClientBoss.run(NioClientBoss.java:42) ~[netty-3.10.6.Final.jar!/:na]
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) ~[netty-3.10.6.Final.jar!/:na]
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) ~[netty-3.10.6.Final.jar!/:na]
... 3 common frames omitted

Answer 1

When the SpringBoot service works in docker it cannot resolve the localhost as a host of the ES. In this case you can also use the links property like following:
In testloganalyzer section add the links option:
testloganalyzer:
image: cvazquezlos/testloganalyzer
ports:
- 8443:8443
links:
- elk:elk
First is the service and second is an alias.
Next change it reference in the application.properties:
spring.data.elasticsearch.cluster-nodes=elk:9300

Answer 2

I think you're missing the networks section in your docker-compose configuration, try this:
version: "2.2"
services:
elk:
image: cvazquezlos/elk:2.4.6
ports:
- 5000:5000
- 5601:5601
- 9200:9200
- 9300:9300
networks:
- elk-network
volumes:
- elk-data:/var/lib/elasticsearch
testloganalyzer:
image: cvazquezlos/testloganalyzer
ports:
- 8443:8443
networks:
- elk-network
volumes:
elk-data:
networks:
elk-network:
driver: bridge