Shawn Heisey commented on SOLR-6733:

An alternative and smarter safety valve idea, which I like better than the 
previous one:

When the hostname is not defined, Solr should check what kind of address is 
detected.  Certain types (loopback, link-local, and the range reserved for 
carrier-grade NAT come to mind) should require a special parameter (maybe 
forceDetectedHost, open to suggestions) to allow startup. An address on a 
private network would start up with no trouble.  So would a public address, 
though I think it might be useful to log a warning for public addresses about 
the dangers of allowing the open Internet to reach a Solr server.  If the 
forceDetectedHost special parameter previously mentioned is configured, the 
public address warning would be suppressed.

> Umbrella issue - Solr as a standalone application
> -------------------------------------------------
>                 Key: SOLR-6733
>                 URL: https://issues.apache.org/jira/browse/SOLR-6733
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Shawn Heisey
>            Priority: Major
> Umbrella issue.
> Solr should be a standalone application, where the main method is provided by 
> Solr source code.
> Here are the major tasks I envision, if we choose to embed Jetty:
>  * Create org.apache.solr.start.Main (and possibly other classes in the same 
> package), to be placed in solr-start.jar.  The Main class will contain the 
> main method that starts the embedded Jetty and Solr.  I do not know how to 
> adjust the build system to do this successfully.
>  * Handle central configurations in code -- TCP port, SSL, and things like 
> web.xml.
>  * For each of these steps, clean up any test fallout.
>  * Handle cloud-related configurations in code -- port, hostname, protocol, 
> etc.  Use the same information as the central configurations.
>  * Consider whether things like authentication need changes.
>  * Handle any remaining container configurations.
> I am currently imagining this work happening in a new branch and ultimately 
> being applied only to master, not the stable branch.

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