UPDATE (March 2020, thanks @ic): I don't know the exact AMI version but yum install docker now works on the latest Amazon Linux 2. The instructions below may still be relevant depending on the vintage AMI you are using.
Amazon changed the install in Linux 2. One no-longer using 'yum' See: https://aws.amazon.com/amazon-linux-2/release-notes/
sudo amazon-linux-extras install docker
sudo service docker start
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 (also called Jabber). The Ignite Realtime Community manage and maintain Openfire releases.
This is a guide of setting up Openfire project in JAVA IDE IntelliJ IDEA.
Openfire is based on JAVA programming language, so if we want to work with source code, Java Development Kit(JDK) must be installed on our machine.
Download and install Java SE(Standard Edition) depending upoun your OS.