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SQLRoboFailover

All in one solution to failover AlwaysOn Availability Groups in SQL Server.

Functions to run comprehensive health checks, failover availability groups, set AG replicas to sync / async modes. Can be combined with the Update-DbaInstance function for a fully automated patching solution.

Requires the SqlServer module.
Optional: Install dbatools module for patching functionality.

Core Functions

This solution is built to be flexible. Functions can be pieced together to build a fully automated solution. Detailed documentation to core functions can be found here.

Example Usage

Patching a SQL Server Instance

Import modules

Import-Module SqlServer -Force
Import-Module .\src\SQLRoboFailover -Force
Import-Module dbatools -Force

Prepare primary node ready for restarts

All-in-one function to failover all primary AGs to a sync-commit replica and set all local replicas to async commit.

  • Checks general sql health
  • Fails over all primary AG's on the server to an available sync-commit replica
  • Run post failover checks
  • Set all sync-commit AGs on the server to async-commit
  • Run health checks to ensure SQL is ready for restarts
Invoke-MakeSQLServerRestartReady -ServerInstance <ServerInstance> -RunPostFailoverChecks -ScriptOnly:$false -Confirm

Patch server using dbatools module

Use dbatools module to patch SQL Server

[bool]$IsSQLServerHealthy = Test-IsSQLServerHealthy -ServerInstance <ServerInstance> -Verbose
[bool]$IsRestartReady = Test-IsRestartReady -ServerInstance <ServerInstance> -Verbose

if ($IsSQLServerHealthy -and $IsRestartReady) {
    $Credential = Get-Credential
    Update-DbaInstance -ComputerName <ServerInstance> -Version 2017CU20 -Path "\\fileshare.prod\FileShare\Database\UpgradeMedia\SQL2017" -Credential $Credential -Confirm
}

else {
    Write-Output "SQL Server - [$ServerInstance] is NOT ready to patch"
}

Check server health after patching

[bool]$IsSQLServerHealthy = Test-IsSQLServerHealthy -ServerInstance <ServerInstance> -RunExtendedAGChecks -Verbose

Set all secondary asynchronous_commit AGs back to synchronous_commit

if ($IsSQLServerHealthy){
  Set-AllSecondaryAsyncReplicasToSync -ServerInstance <ServerInstance> -ForceSingleSyncCopy -ScriptOnly:$false -Confirm
}

Failover Specific AG

Fail over database to an available sync commit replica

Invoke-FailoverAvailabilityGroup -PrimaryServerInstance <PrimaryServer> -AvailabilityGroup "AG10" -RunPostFailoverChecks -Confirm:$true -ScriptOnly:$false