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SwitchEnvironments.ps1
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SwitchEnvironments.ps1
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param (
[Parameter(Mandatory=$True)]
[ValidateSet("Sydney","Melbourne","both")]
[string]$mode,
[Parameter(Mandatory=$false)]
[ValidateSet($true,$false)]
[bool]$AllowDataLoss = $false #pass true for unplanned failover, and by default it is false to run planend failover
)
# --------------------------- Functions ---------------------------
function InitiatePlannedDbFailover([string]$dbName, [string]$Rg, [string]$ServerName, [string]$PartnerRg, [bool]$AllowDataLoss)
{
$SqlDB = Get-AzureRmSqlDatabase -DatabaseName $dbName -ResourceGroupName $Rg -ServerName $ServerName
$isSecondary = IsSecondarySqlDatabase -SqlDB $SqlDB
if($isSecondary -eq $true)
{
Write-Output "Switching database $dbName in server $ServerName to take the primary role in Geo-Replication"
if($AllowDataLoss -eq $true) #non-planned failover, Azure outage etc
{
Set-AzureRmSqlDatabaseSecondary -ResourceGroupName $SqlDB.ResourceGroupName -ServerName $SqlDB.ServerName -DatabaseName $SqlDB.databaseName -PartnerResourceGroupName $PartnerRg -Failover -AllowDataLoss
}
elseif($AllowDataLoss -eq $false) #Planned failover
{
Set-AzureRmSqlDatabaseSecondary -ResourceGroupName $SqlDB.ResourceGroupName -ServerName $SqlDB.ServerName -DatabaseName $SqlDB.databaseName -PartnerResourceGroupName $PartnerRg -Failover
}
}
elseif($isSecondary -eq $false)
{
Write-Warning "The database $dbName in server $ServerName is already a primary db so db failover won't run"
}
}
function IsSecondarySqlDatabase
{
# This function determines whether specified database is performing a secondary replication role
param
(
[Microsoft.Azure.Commands.Sql.Database.Model.AzureSqlDatabaseModel] $SqlDB
)
process {
$IsSecondary = $false;
$ReplicationLinks = Get-AzureRmSqlDatabaseReplicationLink `
-ResourceGroupName $SqlDB.ResourceGroupName `
-ServerName $SqlDB.ServerName `
-DatabaseName $SqlDB.DatabaseName `
-PartnerResourceGroupName $SqlDB.ResourceGroupName
$ReplicationLinks | ForEach-Object -Process `
{
if ($_.Role -ne "Primary")
{
$IsSecondary = $true
}
}
return $IsSecondary
}
}
function DisableEnableTrafficManagerEndPoint([Int] $index, $EndpointName, $ProfileName, $Rg, $EnableOrDisableMode)
{
# Due to the error in cmd Disable-AzureRmTrafficManagerEndpoint we have to use this cmd
# $index 1= Melbourne, 0 = Sydney
$profile = Get-AzureRmTrafficManagerProfile -Name $ProfileName -ResourceGroupName $Rg
if($profile.Endpoints[$index].EndpointStatus -ne $EnableOrDisableMode)
{
$profile.Endpoints[$index].EndpointStatus = $EnableOrDisableMode
Set-AzureRmTrafficManagerProfile -TrafficManagerProfile $profile
}
else{
Write-Warning "The endpoint $EndpointName in profile $ProfileName is already $EnableOrDisableMode"
}
}
# --------------------------- Main script ---------------------------
Write-Output "Starting switching to $mode..."
$currentTime = (Get-Date).ToUniversalTime()
# Fill vairables based on the the environemnt parameter
$con = Get-AutomationConnection -Name "AzureRunAsConnection"
$SubscriptionName = Get-AutomationVariable -Name 'SubscriptionName'
# WebApp parameters
$webapp_syd_name = Get-AutomationVariable -Name 'webapp_syd_name'
$webapp_mel_name = Get-AutomationVariable -Name 'webapp_mel_name'
$webapp_syd_rg = Get-AutomationVariable -Name 'webapp_syd_rg'
$webapp_mel_rg = Get-AutomationVariable -Name 'webapp_mel_rg'
$SydConString = Get-AutomationVariable -Name 'SydConString'
$MelConString = Get-AutomationVariable -Name 'MelConString'
# Db parameters
$dbName = Get-AutomationVariable -Name 'DbName'
$melDbServer = Get-AutomationVariable -Name 'melDbServer'
$sydDbServer = Get-AutomationVariable -Name 'sydDbServer'
$melDbRg = Get-AutomationVariable -Name 'melDbRg'
$sydDbRg = Get-AutomationVariable -Name 'sydDbRg'
# Traffic manager parameters
$trafficManagerProfileName = Get-AutomationVariable -Name 'TrafficManagerProfileName'
$trafficManagerRg = Get-AutomationVariable -Name 'TrafficManagerRg'
$melEndPoint = Get-AutomationVariable -Name 'melEndPoint'
$sydEndPoint = Get-AutomationVariable -Name 'sydEndPoint'
try
{
"Logging in to Azure..."
$null = Add-AzureRmAccount -ServicePrincipal -TenantId $con.TenantId -ApplicationId $con.ApplicationId -CertificateThumbprint $con.CertificateThumbprint
$null = Select-AzureRmSubscription -SubscriptionName $SubscriptionName
Write-Output "Configuring connectionstrings in WebApps..."
if(($mode -eq "Sydney") -or ($mode -eq "both"))
{
$connStrings = @{ 'DefaultConnection' = @{ Type = 'SQLAzure'; Value = "$SydConString" }; };
}
elseif($mode -eq "Melbourne")
{
$connStrings = @{ 'DefaultConnection' = @{ Type = 'SQLAzure'; Value = "$MelConString" }; };
}
$null = Set-AzureRmWebApp -Name $webapp_syd_name -ResourceGroupName $webapp_syd_rg -ConnectionStrings $connStrings
$null = Set-AzureRmWebApp -Name $webapp_mel_name -ResourceGroupName $webapp_mel_rg -ConnectionStrings $connStrings
Write-Output "Initiating failover to switch db..."
if(($mode -eq "Sydney") -or ($mode -eq "both"))
{
InitiatePlannedDbFailover -dbName $dbName -Rg $sydDbRg -ServerName $sydDbServer -PartnerRg $melDbRg -AllowDataLoss $AllowDataLoss
}
elseif($mode -eq "Melbourne")
{
InitiatePlannedDbFailover -dbName $dbName -Rg $melDbRg -ServerName $melDbServer -PartnerRg $sydDbRg -AllowDataLoss $AllowDataLoss
}
Write-Output "Enabling/disabling Traffic Manager endpoints..."
# index 1 = Mel and 0 = Syd
if($mode -eq "Sydney")
{
Write-Output "Disable Melbourne endpoint and enable Sydney"
$null = DisableEnableTrafficManagerEndPoint -index 1 -EndpointName $melEndPoint -ProfileName $trafficManagerProfileName -rg $trafficManagerRg -EnableOrDisableMode "Disabled"
$null = DisableEnableTrafficManagerEndPoint -index 0 -EndpointName $sydEndPoint -ProfileName $trafficManagerProfileName -rg $trafficManagerRg -EnableOrDisableMode "Enabled"
}
elseif($mode -eq "Melbourne")
{
Write-Output "Disable Sydney endpoint and enable Melbourne"
$null = DisableEnableTrafficManagerEndPoint -index 1 -EndpointName $melEndPoint -ProfileName $trafficManagerProfileName -rg $trafficManagerRg -EnableOrDisableMode "Enabled"
$null = DisableEnableTrafficManagerEndPoint -index 0 -EndpointName $sydEndPoint -ProfileName $trafficManagerProfileName -rg $trafficManagerRg -EnableOrDisableMode "Disabled"
}
elseif($mode -eq "both")
{
Write-Output "Enable both Sydney and Melbourne"
$null = DisableEnableTrafficManagerEndPoint -index 1 -EndpointName $melEndPoint -ProfileName $trafficManagerProfileName -rg $trafficManagerRg -EnableOrDisableMode "Enabled"
$null = DisableEnableTrafficManagerEndPoint -index 0 -EndpointName $sydEndPoint -ProfileName $trafficManagerProfileName -rg $trafficManagerRg -EnableOrDisableMode "Enabled"
}
}
catch
{
Write-Error -Message $_.Exception
throw $_.Exception
}
finally
{
Write-Output "Runbook finished (Duration: $(("{0:hh\:mm\:ss}" -f ((Get-Date).ToUniversalTime() - $currentTime))))"
}