Set up alerts on resource log events from VPN Gateway

Artikel
12/02/2021
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This article helps you set up alerts based on resource log events from Azure VPN Gateway using Azure Monitor Log Analytics.

The following resource logs are available in Azure:

Name	Description
GatewayDiagnosticLog	Contains resource logs for gateway configuration events, primary changes, and maintenance events
TunnelDiagnosticLog	Contains tunnel state change events. Tunnel connect/disconnect events have a summarized reason for the state change if applicable
RouteDiagnosticLog	Logs changes to static routes and BGP events that occur on the gateway
IKEDiagnosticLog	Logs IKE control messages and events on the gateway
P2SDiagnosticLog	Logs point-to-site control messages and events on the gateway. Connection source info is provided for IKEv2 and OpenVPN connections only

Set up alerts in the Azure portal

The following example steps create an alert for a disconnection event that involves a site-to-site VPN tunnel:

In the Azure portal, search for Log Analytics under All services and select Log Analytics workspaces.
Select Create on the Log Analytics page.
Select Create New and fill in the details.
Find your VPN gateway on the Monitor > Diagnostics settings blade.
To turn on diagnostics, double-click the gateway and then select Turn on diagnostics.
Fill in the details, and ensure that Send to Log Analytics and TunnelDiagnosticLog are selected. Choose the Log Analytics Workspace that you created in step 3.

Note

It may take a few hours for the data to show up initially.
Go to the overview for the virtual network gateway resource and select Alerts from the Monitoring tab. Then create a new alert rule or edit an existing alert rule.
Select the Log Analytics workspace and the resource.
Select Custom log search as the signal logic under Add condition.

Enter the following query in the Search query text box. Replace the values in <> and TimeGenerated as appropriate.

AzureDiagnostics
| where Category == "TunnelDiagnosticLog"
| where _ResourceId == tolower("<RESOURCEID OF GATEWAY>")
| where TimeGenerated > ago(5m) 
| where remoteIP_s == "<REMOTE IP OF TUNNEL>"
| where status_s == "Disconnected"
| project TimeGenerated, OperationName, instance_s, Resource, ResourceGroup, _ResourceId 
| sort by TimeGenerated asc

Set the threshold value to 0 and select Done.

Note

Bringing the tunnel down and back up will generate logs for this query.

On the Create rule page, select Create New under the ACTION GROUPS section. Fill in the details and select OK.
On the Create rule page, fill in the details for Customize Actions and make sure that the correct name appears in the ACTION GROUP NAME section. Select Create alert rule to create the rule.

Set up alerts by using PowerShell

The following example steps create an alert for a disconnection event that involves a site-to-site VPN tunnel.

Create a Log Analytics workspace:

$Location           = 'westus2'
$ResourceGroupName  = 'TestRG1'
$Sku                = 'pergb2018'
$WorkspaceName      = 'LogAnalyticsWS123'

New-AzOperationalInsightsWorkspace -Location $Location -Name $WorkspaceName -Sku $Sku -ResourceGroupName $ResourceGroupName

Turn on diagnostics for the VPN gateway:

$ResourceGroupName  = 'TestRG1'
$VpnGatewayName     = 'VNet1GW'
$WorkspaceName      = 'LogAnalyticsWS123'

$VpnGateway         = Get-AzVirtualNetworkGateway -Name $VpnGatewayName -ResourceGroupName $ResourceGroupName
$Workspace          = Get-AzOperationalInsightsWorkspace -Name $WorkspaceName -ResourceGroupName $ResourceGroupName

Set-AzDiagnosticSetting `
    -Name 'VPN tunnel' `
    -ResourceId $VpnGateway.Id `
    -WorkspaceId $Workspace.ResourceId `
    -Enabled $true `
    -Category 'TunnelDiagnosticLog'

Create an action group.

This code creates an action group that sends an e-mail notification when an alert is triggered:

$ActionGroupName            = 'EmailAdmins'   # Max. 60 characters long
$ActionGroupShortName       = 'EmailAdmins'   # Max. 12 characters long
$ActionGroupReceiverName    = 'My receiver Name'
$EmailAddress               = 'xyz@contoso.com'
$ResourceGroupName          = 'TestRG1'

$ActionGroupReceiver = New-AzActionGroupReceiver -Name $ActionGroupReceiverName -UseCommonAlertSchema -EmailReceiver -EmailAddress $EmailAddress

Set-AzActionGroup `
   -ResourceGroupName $ResourceGroupName `
   -Name $ActionGroupName `
   -ShortName $ActionGroupShortName `
   -Receiver @($ActionGroupReceiver)

Create an alert rule based on a custom log search:

$ActionGroupName    = 'EmailAdmins'
$EmailSubject       = 'Redmond VPN tunnel is disconnected'
$Location           = 'westus2'
$RemoteIp           = '104.42.209.46'
$ResourceGroupName  = 'TestRG1'
$VpnGatewayName     = 'VNet1GW'
$WorkspaceName      = 'LogAnalyticsWS123'

$VpnGateway         = Get-AzVirtualNetworkGateway -Name $VpnGatewayName -ResourceGroupName $ResourceGroupName
$Workspace          = Get-AzOperationalInsightsWorkspace -Name $WorkspaceName -ResourceGroupName $ResourceGroupName

$Query = @"
AzureDiagnostics |
where Category == "TunnelDiagnosticLog" |
where TimeGenerated > ago(5m) |
where _ResourceId == tolower("$($VpnGateway.id)") |
where remoteIP_s == "$($RemoteIp)" |
where status_s == "Disconnected" |
project TimeGenerated, OperationName, instance_s, Resource, ResourceGroup, _ResourceId |
sort by TimeGenerated asc
"@

$Source             = New-AzScheduledQueryRuleSource -Query $Query -DataSourceId $Workspace.ResourceId
$Schedule           = New-AzScheduledQueryRuleSchedule -FrequencyInMinutes 5 -TimeWindowInMinutes 5
$TriggerCondition   = New-AzScheduledQueryRuleTriggerCondition -ThresholdOperator 'GreaterThan' -Threshold 0

$ActionGroup        = Get-AzActionGroup -ResourceGroupName $ResourceGroupName -Name $ActionGroupName
$AznsActionGroup    = New-AzScheduledQueryRuleAznsActionGroup -ActionGroup $ActionGroup.Id -EmailSubject $EmailSubject
$AlertingAction     = New-AzScheduledQueryRuleAlertingAction -AznsAction $AznsActionGroup -Severity '1' -Trigger $TriggerCondition

New-AzScheduledQueryRule `
    -ResourceGroupName $ResourceGroupName `
    -Location $Location `
    -Action $AlertingAction `
    -Enabled $true `
    -Description 'The tunnel between Azure and Redmond with IP address 104.42.209.46 is disconnected' `
    -Schedule $Schedule `
    -Source $Source `
    -Name 'The Azure to Redmond tunnel is disconnected'

Next steps

To configure alerts on tunnel metrics, see Set up alerts on VPN Gateway metrics.

Set up alerts on resource log events from VPN Gateway

Set up alerts in the Azure portal

Set up alerts by using PowerShell

Next steps

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