One of the most significant new features is the ability to make configuration changes to a running copy of Nginx, without the need to restart the software for the changes to take affect. Typically configuration changes to Web server software, such as Nginx or Apache, require the software to be stopped and then restarted, which can momentarily disrupt operations.
"Even graceful restarts can affect the operation, and adds slight overhead. [Users] want to change aspects of Nginx on the fly," Alexeev said.
The health check can alert an administrator when a back-end component of a Web application has failed, such as the database. It does this by comparing the size of a new Web page with the size it should be. It can also automatically take out of service those servers relying on the failing components. Nginx has also collaborated with New Relic to integrate the data generated by health checks to show up in New Relic's application performance management (APM) software.
Other features of the commercial edition include additional load balancing capabilities, and advanced media streaming for Adobe HDS and Apple HLS video formats.
Although Nginx Plus should run on any standard Linux distribution, Nginx has certified that the software runs on Amazon Linux, Red Hat, CentOS, Ubuntu, and Debian distributions.
Nginx Plus will cost $1,350 per instance per year and is available now.