# Monitoring of two nodered instances possible?

**URL:** <https://discourse.nodered.org/t/monitoring-of-two-nodered-instances-possible/49420>\
**Category:** General\
**Created:** [6 August 2021 12:44 UTC](https://discourse.nodered.org/t/monitoring-of-two-nodered-instances-possible/49420 "2021-08-06T12:44:09Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![quito96](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/quito96/32/17252_2.png) [@quito96](https://discourse.nodered.org/u/quito96)\
**Post date:** [6 August 2021 12:44 UTC](https://discourse.nodered.org/t/monitoring-of-two-nodered-instances-possible/49420/1 "2021-08-06T12:44:10Z")

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Hi,

Two days ago one of my Nodered instances crashed, unfortunately I noticed it way too late.  
Is it possible that Nodered instances located on two different computers monitor each other?  
Any ideas?

BR Quito

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**Author:** ![jbudd](https://avatars.discourse-cdn.com/v4/letter/j/5f8ce5/32.png) [@jbudd](https://discourse.nodered.org/u/jbudd)\
**Post date:** [6 August 2021 13:03 UTC](https://discourse.nodered.org/t/monitoring-of-two-nodered-instances-possible/49420/2 "2021-08-06T13:03:10Z")

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Easy if you have an mqtt broker. Send a "heartbeat" message from each every minute, each one subscribes to the other's topic and if nothing arrives for 3 minutes, send a notification.

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<div class="post-metadata">

**Author:** ![quito96](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/quito96/32/17252_2.png) [@quito96](https://discourse.nodered.org/u/quito96)\
**Post date:** [6 August 2021 13:11 UTC](https://discourse.nodered.org/t/monitoring-of-two-nodered-instances-possible/49420/3 "2021-08-06T13:11:49Z")

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great idea ….😊

my sloution:

```auto
[{"id":"31de5363.b59fec","type":"mqtt in","z":"5e091eab.a7ad68","name":"/HomeAssistant/","topic":"/HomeAssistant/","qos":"2","datatype":"auto","broker":"c9e4be83.d1f2a8","x":160,"y":180,"wires":[["5e9394e9.36979c"]]},{"id":"9099fd30.d26d6","type":"mqtt out","z":"5e091eab.a7ad68","name":"/Redmatic/","topic":"/Redmatic/","qos":"2","retain":"","broker":"c9e4be83.d1f2a8","x":330,"y":280,"wires":[]},{"id":"c5282e14.17fe","type":"inject","z":"5e091eab.a7ad68","name":"","props":[{"p":"payload"}],"repeat":"60","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"Alive","payloadType":"str","x":150,"y":280,"wires":[["9099fd30.d26d6"]]},{"id":"c3d884e4.5c4b4","type":"pushover","z":"5e091eab.a7ad68","name":"HomeAssistant ausgefallen","device":"","title":"HomeAssistant ausgefallen","priority":"1","sound":"siren","url":"","url_title":"","html":false,"x":700,"y":180,"wires":[]},{"id":"5e9394e9.36979c","type":"timeout","z":"5e091eab.a7ad68","name":"Warning --NodeRed crashed!","outtopic":"","outsafe":"Online Again","outwarning":"Warning --NodeRed since 2 Minutes inactiv.","outunsafe":"Warning --NodeRed crashed!","warning":"120","timer":"300","repeat":false,"again":false,"x":410,"y":180,"wires":[["c3d884e4.5c4b4"]]},{"id":"c9e4be83.d1f2a8","type":"mqtt-broker","name":"MQTT-PI4","broker":"192.168.2.122","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthRetain":"false","birthPayload":"","closeTopic":"","closeQos":"0","closeRetain":"false","closePayload":"","willTopic":"","willQos":"0","willRetain":"false","willPayload":""}]

```

Fixed Version.  
Thx jbudd

works great 🙂

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<div class="post-metadata">

**Author:** ![jbudd](https://avatars.discourse-cdn.com/v4/letter/j/5f8ce5/32.png) [@jbudd](https://discourse.nodered.org/u/jbudd)\
**Post date:** [6 August 2021 14:16 UTC](https://discourse.nodered.org/t/monitoring-of-two-nodered-instances-possible/49420/4 "2021-08-06T14:16:16Z")

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The very last double quote character in your solution looks like it's been mangled by a word processor  
 ![Untitled 7](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/2/a/2a78faf041b932b7493a208d047fe45043c47ea8.jpeg)

I just use a Trigger rather than the Timeout node but Timeout looks perfect for the job.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [20 August 2021 14:16 UTC](https://discourse.nodered.org/t/monitoring-of-two-nodered-instances-possible/49420/5 "2021-08-20T14:16:47Z")

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