Kibana fails to connect to Elasticsearch on docker - windows

Question

I am following https://www.elastic.co/guide/en/elasticsearch/reference/6.5/docker.html
and
https://www.elastic.co/guide/en/kibana/6.5/docker.html
But it does not seems to work well with kibana, ES works fine.
I tried starting kibana alone, but finally i added it to one docker-compose file.
services:
elasticsearch:
image: docker.elastic.co/elasticsearch/elasticsearch:6.5.4
container_name: elasticsearch
environment:
- cluster.name=docker-cluster
- bootstrap.memory_lock=true
- "ES_JAVA_OPTS=-Xms512m -Xmx512m"
ulimits:
memlock:
soft: -1
hard: -1
volumes:
- esdata1:/usr/share/elasticsearch/data
ports:
- 9200:9200
networks:
- esnet
elasticsearch2:
image: docker.elastic.co/elasticsearch/elasticsearch:6.5.4
container_name: elasticsearch2
environment:
- cluster.name=docker-cluster
- bootstrap.memory_lock=true
- "ES_JAVA_OPTS=-Xms512m -Xmx512m"
- "discovery.zen.ping.unicast.hosts=elasticsearch"
ulimits:
memlock:
soft: -1
hard: -1
volumes:
- esdata2:/usr/share/elasticsearch/data
networks:
- esnet
kibana:
image: docker.elastic.co/kibana/kibana:6.5.4
volumes:
- ./kibana.yml:/usr/share/kibana/config/kibana.yml
ports:
- 5601:5601
volumes:
esdata1:
driver: local
esdata2:
driver: local
networks:
esnet:
Kibana.yml is:
server.host: "0.0.0.0"
server.name: "kibana"
elasticsearch.url: http://elasticsearch:9200
I get following error:
kibana_1 | {"type":"log","#timestamp":"2019-06-11T08:55:30Z","tags":["warning","elasticsearch","admin"],"pid":1,"message":"Unable to revive connection: http://elasticsearch:9200/"}

Answer 1

The kibana container isn't on the same network as the two elasticsearch containers: it doesn't have a networks: block and so is on an automatically-created default network, but the two elasticsearch containers are on an explicitly-declared esnet network. Since they're not on the same network, inter-container DNS doesn't work.
I'd suggest just deleting all of the networks: blocks and using the default network Docker Compose creates for you. If you want an explicit named network, copy the same networks: [esnet] lines into the kibana: service block.