I'm trying to access an external URL from within my Docker Container running on an AWS EC2 Instance.
Though I'm able to CURL from the EC2 Instance - the same CURL doesn't work from within the Docker container. Essentially this CURL works in the EC2 Instance but NOT within the Docker Container. Why would that be?
Dockerfile:
FROM docker.elastic.co/kibana/kibana:6.5.0
ENV ELASTICSEARCH_URL=https://elasticsearch.myorg.com
EXPOSE 5601
CMD ["/usr/local/bin/kibana-docker"]
So after a LOT of trial and error, I finally figured out the problem. It looks like running the docker image using the standard:
docker run -d -p 5601:5601 my-kibana-image:1
doesnt suffice. The host resolution to elasticsearch (which is an external host) ONLY works when I change the network configuration from the default to "host". Doing this
docker run --net=host -d -p 5601:5601 my-kibana-image:1
finally fixed the issue and the kibana container instance was FINALLY able to talk to elasticsearch!!! Kibana bootstrapped correctly and I was able to bring it up fine at this point.