Script to restart mango

[Dan M]

Is there a way to restart the mango server from a script (like a RuntimeManager.restartInstance command)? I've been playing around with Mango (2.8.6 version) on a raspberry pi 3 and after a while, memory goes down. Once the JVM shows around 160MB free memory left, it will occasionally crash requiring a hard reboot. Is there a cheap and easy fix for now to just do a server restart? Not the ideal or finish solution, but will work for the time being..

[ThomasEinasto]

Hi Dan,

I did it by looking the PID of java, as Mango is a java application in the linux env.

I made a bash program like that:

#!/bin/bash

if pgrep "java" > /dev/null
then
exit 0
else
sh /opt/mango/bin/ma.sh start > /dev/null
exit 1
fi

And put this into a crontab like every x minutes which will check if the java application has crashed or not. If it has then it restarts the mango instance. You can put a reboot command after else so that it will reboot instead of relaunching the application.

Thomas

[phildunlap]

Hi Dan,

One of the easiest ways to ensure Mango restarts on crash is to touch /path/to/mango/RESTART which will cause the ma-start.sh or ma-start.bat script to start Mango again when the currently running Mango finishes. Scripts in Mango/bin/ext-enabled are called with the first argument 'restart'

To your question, yes it is possible to schedule a restart from within a Mango script, but there aren't any wrapper hooks, so you have to do it the same way the modules page would,

com.serotonin.m2m2.web.dwr.ModulesDwr.scheduleRestart(); //Schedule restart for ten seconds from now.

or you can get whatever delay you want,

var timeout = com.serotonin.m2m2.Common.getMillis(com.serotonin.m2m2.Common.TimePeriods.MINUTES, 17);
var lifecycle = com.serotonin.provider.Providers.get(com.serotonin.m2m2.IMangoLifecycle.class);
lifecycle.scheduleShutdown( timeout, true /* restart */, null);