Forum Discussion

Ramanan16's avatar
Ramanan16
Copper Contributor
Jan 24, 2021

How to Monitoring RAM Size

Hi Team,  I want to monitoring VM RAM size. So that if the RAM size got increased i will be notified. Is it possible?
ibnmbodji's avatar
ibnmbodji
Iron Contributor
Jan 24, 2021

Ramanan16 

 

Hi 

You can display, monitor and configuring alerts by using VM Insights 

 

First of all you will need a log analytics workspace  . 

Once you have deployed the log analytics resource . 

Go to your VM blade  in Monitoring click on Insights then enable

Next select the log analytics you just create and click on  enable 

Once your VM is connected you will be able to do some queries . 

You can select default queries for virtual machines and run it .

Once the query is completed you can see +New alert rule  button . 

CLick on it and you will able to configure the condition and the actions ( send to email sms ...)

Health (preview)  feature which is also interesting since you can enable directly alerts status.

All of the steps can be automated with powershell 

https://github.com/infeeny/VMInsights/blob/master/VMInsights.ps1

Log search Example : 

// Virtual Machine available memory 
// Chart the VM's available memory over time. 
// To create an alert for this query, click '+ New alert rule'
Perf
| where ObjectName == "Memory" and
(CounterName == "Available MBytes Memory" or // the name used in Linux records
CounterName == "Available MBytes") // the name used in Windows records
|  summarize avg(CounterValue) by bin(TimeGenerated, 15min), Computer, _ResourceId // bin is used to set the time grain to 15 minutes
| render timechart

 

https://docs.microsoft.com/en-us/azure/azure-monitor/insights/vminsights-configure-workspace

https://docs.microsoft.com/en-us/azure/azure-monitor/insights/vminsights-health-overview

  • Ramanan16's avatar
    Ramanan16
    Copper Contributor
    Jan 26, 2021

    ibnmbodji 

    Thanks for your time and the details. But, the "Available Memory" metrics will show only the remaining unused Memory on the VM. It will not show the Total Memory on that VM. All i need is if the VM has 16GB RAM, i need to monitor it and should get the alert if the RAM size get upgraded or downgraded. 

    • ibnmbodji's avatar
      ibnmbodji
      Iron Contributor
      Jan 26, 2021

      Ramanan16 

      Hi

      You cannot upgrade the memory without picking a new size for the VM . In this case you can use  native administrative signal logic and have condition like this to trigger an alert : 

      Whenever the Activity Log has an event with Category='Administrative', Signal name='Create or Update Virtual Machine (Microsoft.Compute/virtualMachines)'

      With Application Change analysis you can preview and see what was the old and new value for the size 

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