Creating a new public instance
Multiple public instances are useful when you want to:
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Publish one part of a site to a different public instance. 
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Manage multiple sites in one author instances and publish each site to a dedicated public instance. 
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Add more public instances to cope with a high load. 
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Add more public instances to ensure high-availability. 
You must have a DX Core license to be able to configure multiple working public instances.
Copying a public instance
The simplest way is to create a new public instance is to copy an existing one.
| Before you do this, back up the webappsfolder and the database.
There is always the risk of corrupting the existing instance. | 
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Stop both your Public and Author instances. 
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Copy a public instance folder such as magnoliaPublic. If you use an external database such as MySQL, copy the database folder too.
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Rename the copied folder to magnoliaPublic2.
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Delete unnecessary subfolders from the copy. The copy is a clone of the source instance. Some folders are essential to the new instance but others can be deleted. - 
OK to delete: - 
cache, contains cached entries of the original instance.
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logs, contains log entries of the original instance. Empty log files will be recreated during server startup.
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indexsubfolders in each/repositories/magnolia/workspaces/*folder. Deleting the subfolders reindexes therepositories. The rest of therepositoriesfolders should remain intact.
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tmp, a temporary folder which Tomcat or Jackrabbit uses for its processes during export/import.
 
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Do not delete: - 
docroot, contains the TomcatdocBasestatic resources.
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META-INF
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templates, contains static resources.
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WEB-INF
 
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If you use an external database such as MySQL, connect the new instance to its database location. Edit the Jackrabbit configuration XML file in /webapps/magnoliaPublic2/WEB-INF/config/repo-conf. Each database has a file of its own, edit the file that you have configured inmagnolia.propertiesin themagnolia.repositories.jackrabbit.configparameter. For example, if you use MySQL, then editjackrabbit-bundle-mysql-search.xml.Add the connection information twice: Once for the workspacesection and once for theversioningsection in the XML file.You can also include a custom XML configuration file for your database. For more information, see Content storage and structure and Configuration. 
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If you use an external database, set the persistence manager also for each workspace. Workspace configuration XML files are in /<contextPath>/repositories/magnolia/workspaces/<workspace>/workspace.xml.
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Start Magnolia. 
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Update the existing MicroProfile receiver configuration: magnolia.publishing.receivers[0].name=magnoliaPublic8080 magnolia.publishing.receivers[0].url=http://localhost:8080/magnoliaPublic magnolia.publishing.receivers[0].enabled=true magnolia.publishing.receivers[1].name=magnoliaPublicTwo8080 magnolia.publishing.receivers[1].url=http://localhost:8080/magnoliaPublic2 magnolia.publishing.receivers[1].enabled=true
Other ways to create a public instance
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Backup module. Use the Restore function. This creates a new public instance for the restored data automatically. 
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Synchronization module. Create new public instances without shutting down existing ones. 
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Programmatically by writing a cloneInstanceCommand.
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Jackrabbit DataStore for blobs in special cases.