Syntax to specify multiple hosts using ELASTICSEARCH_HOSTS env?

Elastic Stack Kibana
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follow-up to: Kibana docker list multiple ES hosts

I have tried various values for this environment variable:

http://elasticsearch-1:9200,http://elasticsearch-2:9200,http://elasticsearch-3/9200

http://elasticsearch-1:9200 http://elasticsearch-2:9200 http://elasticsearch-3/9200

(http://elasticsearch-1:9200,http://elasticsearch-2:9200,http://elasticsearch-3/9200)

(http://elasticsearch-1:9200 http://elasticsearch-2:9200 http://elasticsearch-3/9200)

[http://elasticsearch-1:9200,http://elasticsearch-2:9200,http://elasticsearch-3/9200]

[http://elasticsearch-1:9200 http://elasticsearch-2:9200 http://elasticsearch-3/9200]

["http://elasticsearch-1:9200","http://elasticsearch-2:9200","http://elasticsearch-3:9200"]

- http://elasticsearch-1:9200 - http://elasticsearch-2:9200 - http://elasticsearch-3/9200

- http://elasticsearch-1:9200\n - http://elasticsearch-2:9200\n - http://elasticsearch-3/9200

All without success. Please, can you let us know?

Near as I can tell the correct separator is a space as it gives us this error:

FATAL  Error: "elasticsearch.hosts" setting was not applied. Check for spelling errors and ensure that expected plugins are installed.

instead of:

FATAL  ValidationError: child "elasticsearch" fails because [child "hosts" fails because [single value of "hosts" fails because ["hosts" must be a valid uri with a scheme matching the http|https pattern]]]

but still the mystery of the correct way to specify this to kibana (6.6.0) eludes me.

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@Aaron_Caldwell in the other topic you suggested:

That syntax looks fine for kibana.yml but how do we express that as an environment variable? Adding an example to the actual documentation would be REALLY helpful.

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@Supermathie have you tried ELASTICSEARCH_HOSTS='["http://....","http://..."]' ?

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That doesn't work either:

kibana             |  FATAL  ValidationError: child "elasticsearch" fails because [child "hosts" fails because [single value of "hosts" fails because ["hosts" must be a valid uri with a scheme matching the http|https pattern]]]
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@Supermathie can you please be sure that you are not mistype any part of it?
I was able to find two different places where people states that it worked as expected.

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Was support for this added in Kibana version 7? As specified in the OP I'm on 6.6.0.

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@Supermathie I miss that part. I was confirming to the code and it looks like for our released docker artifacts it would only work starting on 6.6.1. Can you try with that version please?

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Hi!

i was looking for the same information some weeks ago. Find what works for the docker image of Kibana 6.8.6 OSS (I haven't tried the rest)

Docker compose syntax below:

    kibana:
      image: docker.elastic.co/kibana/kibana-oss:6.8.6
      environment:
        - ELASTICSEARCH_USERNAME=kibanaserver
        - ELASTICSEARCH_PASSWORD=kibanaserver
        - ELASTICSEARCH_HOSTS=["https://elasticsearch1:9200","https://elasticsearch2:9100"]
        - ELASTICSEARCH_SSL_VERIFICATIONMODE=none
      ports:
        - 5602:5601

Pay attention just to the variable ELASTICSEARCH_HOSTS. I pasted all the section to add some context.

The way the env variables are used inside the container is the following:

/usr/share/kibana/bin/../node/bin/node --no-warnings --max-http-header-size=65536 /usr/share/kibana/bin/../src/cli --cpu.cgroup.path.override=/ --cpuacct.cgroup.path.override=/ --elasticsearch.hosts=["https://elasticsearch1:9200","https://elasticsearch2:9100"] --elasticsearch.password=kibanaserver --elasticsearch.ssl.verificationMode=none --elasticsearch.username=kibanaserver

I hope it helps!

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Using docker.elastic.co/kibana/kibana:6.6.1 all of these variants fail:

      - ELASTICSEARCH_HOSTS='http://elasticsearch-1:9200,http://elasticsearch-2:9200,http://elasticsearch-3:9200'
      - ELASTICSEARCH_HOSTS='[http://elasticsearch-1:9200,http://elasticsearch-2:9200,http://elasticsearch-3:9200]'
      - ELASTICSEARCH_HOSTS='["http://elasticsearch-1:9200","http://elasticsearch-2:9200","http://elasticsearch-3:9200"]'

After some more digging I realized this value works (even on 6.6.0):

["http://elasticsearch-1:9200","http://elasticsearch-2:9200","http://elasticsearch-3:9200"]

which (due to escaping rules) must be specified on the command line as:

ELASTICSEARCH_HOSTS='["http://elasticsearch-1:9200","http://elasticsearch-2:9200","http://elasticsearch-3:9200"]'

or in docker-compose.yml as:

ELASTICSEARCH_HOSTS=["http://elasticsearch-1:9200","http://elasticsearch-2:9200","http://elasticsearch-3:9200"]

I had been specifying it using the former in docker-compose.yml which won't work since the appropriate quoting for that would be:

      - 'ELASTICSEARCH_HOSTS=["http://elasticsearch-1:9200","http://elasticsearch-2:9200","http://elasticsearch-3:9200"]'
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