# 2 instances of ElasticSearch deployed with docker can't see each other
**URL:** https://discuss.elastic.co/t/2-instances-of-elasticsearch-deployed-with-docker-cant-see-each-other/31351
**Category:** Elasticsearch
**Created:** [September 29, 2015, 5:03pm UTC](https://discuss.elastic.co/t/2-instances-of-elasticsearch-deployed-with-docker-cant-see-each-other/31351 "2015-09-29T17:03:47Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@cruizpollino](https://discuss.elastic.co/u/cruizpollino)
#### Post date: [September 29, 2015, 5:03pm UTC](https://discuss.elastic.co/t/2-instances-of-elasticsearch-deployed-with-docker-cant-see-each-other/31351/1 "2015-09-29T17:03:47Z")
Good evening,
I've started two instances of elasticsearch on two hosts as docker containers
the issue now is the elasticsearch instances are not able to see each other
does anyone know what configuration changes or command parameters shall be used in order to have these two instances working together as a cluster?
Thanks in advance
Kind Regards
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### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [September 30, 2015, 6:28am UTC](https://discuss.elastic.co/t/2-instances-of-elasticsearch-deployed-with-docker-cant-see-each-other/31351/2 "2015-09-30T06:28:34Z")
Are you using multicast or unicast discovery?
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### Author:  [@cruizpollino](https://discuss.elastic.co/u/cruizpollino)
#### Post date: [September 30, 2015, 6:56am UTC](https://discuss.elastic.co/t/2-instances-of-elasticsearch-deployed-with-docker-cant-see-each-other/31351/3 "2015-09-30T06:56:44Z")
good morning,
i have not set any special discovery option when i started the containers
docker run -d -p 9200:9200 -p 9300:9300 elasticsearch
is the command used to start the container on each node
regards
Enviado desde mi iPhone
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### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [September 30, 2015, 7:33am UTC](https://discuss.elastic.co/t/2-instances-of-elasticsearch-deployed-with-docker-cant-see-each-other/31351/4 "2015-09-30T07:33:46Z")
Okay, but what does the elasticsearch container come from?
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### Author:  [@cruizpollino](https://discuss.elastic.co/u/cruizpollino)
#### Post date: [September 30, 2015, 8:06am UTC](https://discuss.elastic.co/t/2-instances-of-elasticsearch-deployed-with-docker-cant-see-each-other/31351/5 "2015-09-30T08:06:54Z")
sorry magnus,
But I don't really understand your last question, I'm using the official
elasticsearch container available in the docker hub page
I've deployed one instance on compute1 server and the second one compute2
one, and the issue is that the containers can't see each other so up to now
i've two clusters with one node each
regards
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### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [September 30, 2015, 8:25am UTC](https://discuss.elastic.co/t/2-instances-of-elasticsearch-deployed-with-docker-cant-see-each-other/31351/6 "2015-09-30T08:25:16Z")
> But I don't really understand your last question, I'm using the official elasticsearch container available in the docker hub page
Thanks, that's exactly the missing piece of information. And it's version 1.7 you're using, i.e. the one currently with the "latest" tag?
I'm pretty sure this is an issue with Docker and multicast (which ES uses as its default discovery mechanism). See [github.com/docker/docker/issue #3043](https://github.com/docker/docker/issues/3043).
It's often recommended to use unicast discovery instead of multicast, so that could be something to explore. You could build your own Docker image with a custom elasticsearch.yml that disables multicast and references both ES hosts so that they can contact each other.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 5, 2017, 11:47pm UTC](https://discuss.elastic.co/t/2-instances-of-elasticsearch-deployed-with-docker-cant-see-each-other/31351/7 "2017-07-05T23:47:27Z")