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https://issues.apache.org/jira/browse/SOLR-7545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14545476#comment-14545476
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Shawn Heisey commented on SOLR-7545:
------------------------------------

I'm pretty sure that defaulting to localhost with no other input is a bad idea. 
 SolrCloud uses Java methods to find its own IP address, which I believe 
normally defaults to the first IP address it finds on the system that's not 
assigned to a loopback interface.  This allows a multi-host cloud to work 
without configuring hostnames on each system as long as there's only one IP 
address on each one.  If you change that to localhost, then a multi-host cloud 
will no longer function unless the user explicitly configures the hostname on 
every system, which would be a serious regression.

> SOLR_HOST parameter not honoured in bin/solr and SolrCLI
> --------------------------------------------------------
>
>                 Key: SOLR-7545
>                 URL: https://issues.apache.org/jira/browse/SOLR-7545
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Ishan Chattopadhyaya
>         Attachments: SOLR-7545.patch, SOLR-7545.patch, SOLR-7545.patch, 
> SOLR-7545.patch
>
>
> It seems there are a few places in bin/solr (and maybe SolrCLI class?) where 
> localhost is hardcoded, and hence the SOLR_HOST parameter isn't taking 
> effect. Will add a patch to fix this shortly.



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