'DNS Resolution for Redis, Elasticsearch and Postgres hosts not working after introducing Spring Wbflux
Everything was working until I introduced Webflux into our Sprint Boot application running on external tomcat inside a docker container. This was needed when I wrote an elasticsearch repository using ReactiveCrudRepository to implement asynchronous save/fetch operations. Now, our Spring Boot apps hosted on docker are not able to connect to any of the datastores.
For Redis the exception is -
Caused by: java.net.UnknownHostException: Failed to resolve 'redis1' after 2 queries
For Elasticsearch -
Caused by: org.springframework.data.elasticsearch.client.NoReachableHostException: Host 'es_host:9200' not reachable. Cluster state is offline.
The data nodes are all hosted on separate instances.
On researching around a bit, I came across several issues with netty's DNS resolver, but there is no standard fix mentioned anywhere. Please advice.
Sources
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Source: Stack Overflow
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