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https://issues.apache.org/jira/browse/SOLR-16054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17497466#comment-17497466
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Jan Høydahl commented on SOLR-16054:
------------------------------------

It is basically free form, but it is far simpler for 80% of users to type one 
of the four and nothing more, and you get red/orange/yellow/green ootb.

The code "prod" os a controlled key. It is not displayed anywhere, so you can 
achieve all you want with e.g.
{code:java}
-Dsolr.environment=stage,label=Candidate
-Dsolr.environment=prod,label=Area51{code}
Keeping the keys controlled allows us to use this feature as a foundation for 
other features, as proposed by [~dsmiley] , e.g.:

 
||Mode||Authentication||ulimit checks||network binding||SSL||
|dev|No check|No|All interfaces|Auto-generate self signed|
|test|Complain if not configured|Yes, warn|All interfaces|Auto-generate self 
signed|
|stage|Refuse to start if not configured
Override with -Dsolr.security.insecure=true|Yes, enforce|127.0.0.1 by 
default|Complain if SSL not enabled|
|prod|Refuse to start if not configured
Override with -Dsolr.security.insecure=true|Yes, enforce|127.0.0.1 by 
default|Complain if SSL not enabled|

Then "dev" could be the default, and it would print in logs "Running in 
development mode, please specify solr.environment property when going to 
production"

> Environment banner not working if environment is not dev or prod
> ----------------------------------------------------------------
>
>                 Key: SOLR-16054
>                 URL: https://issues.apache.org/jira/browse/SOLR-16054
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 8.11.1
>            Reporter: Gaël Jourdan
>            Assignee: Jan Høydahl
>            Priority: Minor
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When using the new system property to display a environment banner in Solr 
> UI, I cannot make it work.
>  
> First attempt with `-Dsolr.environment=unknown,color=red` gives the following 
> error message on the UI: "Bad environment pattern: unknown,color=red".
>  
> Second attempt with just `-Dsolr.environment=unknown` gives no error but no 
> banner appear nowhere.
>  
> Third attempt using "dev" or "prod" do work. Thus I'm guessing there is a 
> list of allowed values?
> I believe any value should be accepted as orgs can have various name for 
> their environment, especially with ephemeral environment.
> Or at least the documentation should mention the list of allowed values.



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