通过上一篇的简介，相信各位对于简单的创建alert，以及Azure monitor使用以及大概有个印象了。基础的使用总是非常简单的，这里再分享一个常用的alert使用方法
实际工作中，不管是日常运维还是做项目，我们都需要知道VM的实际性能情况，避免出现性能瓶颈，因此创建alert是一种非常方便的方式，我们可以通过alert第一时间知道系统出现了性能的瓶颈，以便尽快采取解决措施。
因此，也衍生了一个实际的问题，单独为一台VM开启alert很简单，但是如果我们需要为一个资源组内十几甚至几十上百台VM统一创建alert，则会非常麻烦
在这里分享一个自己写的简单脚本，可以通过批量的方式为一个资源组内的所有VM，或者是某个单独的VM创建alert，省去很多不必要的重复性工作，以下是代码的内容
<#
.NOTES
===========================================================================
Created with: SAPIEN Technologies, Inc., PowerShell Studio 2017 v5.4.134
Created on: 2019/1/10 13:19
Created by: mxy
Organization:
Filename:
===========================================================================
.DESCRIPTION
A description of the file.
#>
param
(
[parameter(Mandatory = $true)]
[string]$RGName,#资源组名称
[parameter(Mandatory = $false)]
[string]$VmName,#VM名称
[parameter(Mandatory = $true)]
[string]$MailAddress,#邮件地址
[parameter(Mandatory = $false)]
[ValidateSet("CPU", "Memory")]
[string]$Metric = "CPU",#需要针对哪个metric创建alert,方便起见这里目前只是设置了CPU和内存两种
[parameter(Mandatory = $false)]
[ValidateSet("GreaterThan", "GreaterThanOrEqual", "LessThan", "LessThanOrEqual")]
[string]$Operation = "GreaterThan",#操作条件
[parameter(Mandatory = $false)]
[int]$Threshold = 50,#阈值
[parameter(Mandatory = $false)]
[ValidateSet("Average", "Last", "Maximum", "Minimum", "Total")]#计算方式，是平均还是最大等
[string]$TimeAggregationOperator = "Average",
[parameter(Mandatory = $false)]
[TimeSpan]$WindowSize = "00:05:00"#时间戳
)
function Write-DateTimeMessage
{
param (
[parameter(Mandatory = $false)]
[switch]$Warning,
[parameter(Mandatory = $true)]
[string]$Message,
[parameter(Mandatory = $false)]
[string]$ForegroundColor
)
if ($Warning)
{
Write-Warning ($(Get-Date -UFormat '%Y/%m/%d %H:%M:%S') + " * " + $Message)
}
else
{
if ($ForegroundColor)
{
Write-Host ($(Get-Date -UFormat '%Y/%m/%d %H:%M:%S') + " * " + $Message) -ForegroundColor $ForegroundColor
}
else
{
Write-Host ($(Get-Date -UFormat '%Y/%m/%d %H:%M:%S') + " * " + $Message)
}
}
}
#Get metric name
switch ($Metric)
{
Memory {
$MetricName = "\Memory\% Committed Bytes In Use"
}
CPU {
$MetricName = "\Processor Information(_Total)\% Processor Time"
}
default
{
#<code>
}
}
#Find the vm if vmname parameter specified
try
{
$Error.Clear()
if ($VmName)
{
Write-DateTimeMessage "Trying to find vm $VmName in resource group $RGName"
$vms = Get-AzureRmVM -ResourceGroupName $RGName -Name $VmName -ErrorAction Stop
Write-DateTimeMessage "vm $VmName Found in resource group $RGName"
}
else
{
$vms = Get-AzureRmVM -ResourceGroupName $RGName -ErrorAction Stop
}
# Create action email
$actionEmail = New-AzureRmAlertRuleEmail -CustomEmail $MailAddress -WarningAction SilentlyContinue
# Get resource id and add alert
if ($vms -ne $null)
{
foreach ($vm in $vms)
{
$vmID = $vm.id
$AlertName = $vm.Name + "_Alert_" + $Metric + "_" + $Operation + "_" + $Threshold + "_" + $actionEmail.CustomEmails
$Error.Clear()
Write-DateTimeMessage "Trying to add alert for vm $($vm.Name) ..."
Add-AzureRmMetricAlertRule -Name $AlertName -Location "ChinaEast" -ResourceGroup $RGName -TargetResourceId $vmID -MetricName $MetricName -Operator $Operation -Threshold $Threshold -WindowSize $WindowSize -TimeAggregationOperator $TimeAggregationOperator -Action $actionEmail -ErrorAction 'Stop' -WarningAction 'SilentlyContinue' | Out-Null
Write-DateTimeMessage "Add alert for vm $($vm.Name) successfully!"
}
}
else
{
Write-DateTimeMessage "No vm in resource group $RGName"
}
}
catch
{
Write-DateTimeMessage $Error[0].Exception.Message
}
可以看到脚本很简单，运行方法这里举个例子，比如要为mxytest这个资源组下的所有VM创建CPU10分钟之内大于80便发邮件给abc@abc.com的alert，则可以按照以下方式运行
.\Create-AzureAlert.ps1 -RGName mxytest -MailAddress "abc@abc.com" -Metric CPU -Operation GreaterThan -Threshold 80 -TimeAggregationOperator Average -WindowSize "00:10:00"
创建完成后即可在alert中国看到对应的内容
Get-AzureRmAlertRule -ResourceGroupName mxytest -WarningAction SilentlyContinue
也可以通过PowerShell获取到信息
