What is OpenFire
Openfire is a real time collaboration (RTC) server licensed under the Open Source Apache License. It uses the only widely adopted open protocol for instant messaging, XMPP Openfire is incredibly easy to setup and administer, but offers rock-solid security and performance. -https://igniterealtime.org/projects/openfire/
Installing Docker
Running OpenFire
Making the Configuration Persistent
Setting Up A XMPP Client
Documentation: https://github.com/QuantumObject/docker-openfire