Change Port Headless Linux Install

Ignition
1

I am trying to change the port on Ubuntu 18.04

I run

gwcmd --port 80

and receive the message

Error! No response from Gateway, http port is unchanged.

Here is what I see in the wrapper log

INFO | jvm 1 | 2020/02/06 00:34:34 | java.lang.NullPointerException
INFO | jvm 1 | 2020/02/06 00:34:34 | at com.inductiveautomation.ignition.gateway.server.WebServerManager.setHttpPort(WebServerManager.java:274)
INFO | jvm 1 | 2020/02/06 00:34:34 | I [GcuInterface ] [00:34:34]: Received SetWebSettingsRequest
INFO | jvm 1 | 2020/02/06 00:34:34 | at com.inductiveautomation.ignition.gateway.web.WebResourceManagerImpl.setHttpPort(WebResourceManagerImpl.java:447)
INFO | jvm 1 | 2020/02/06 00:34:34 | at com.inductiveautomation.ignition.gateway.GcuInterface.setWebSettings(GcuInterface.java:158)
INFO | jvm 1 | 2020/02/06 00:34:34 | at com.inductiveautomation.ignition.gateway.GcuInterface.requestReceieved(GcuInterface.java:568)
INFO | jvm 1 | 2020/02/06 00:34:34 | at com.inductiveautomation.catapult.GcuRequestServer.handleRequest(GcuRequestServer.java:60)
INFO | jvm 1 | 2020/02/06 00:34:34 | at com.inductiveautomation.catapult.GcuRequestServer$RequestFileMonitor$2.run(GcuRequestServer.java:118)
INFO | jvm 1 | 2020/02/06 00:34:34 | at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
INFO | jvm 1 | 2020/02/06 00:34:34 | at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
INFO | jvm 1 | 2020/02/06 00:34:34 | at java.base/java.lang.Thread.run(Unknown Source)

2

found this in the manual

If using Linux, you may need to alter the file /usr/local/bin/ignition/ignition.sh on line 112 from RUN_AS_USER=ubuntu to RUN_AS_USER=root. This is because you must be root to bind to a port below 1024.