Invoke-AlwaysOnCommand

DBSystems: Enables or disables the Always On availability groups feature for a server

Script

#Requires -Version 5.0
#Requires -Modules SQLServer

[CmdLetBinding()]
Param(
    [Parameter(Mandatory = $true)]   
    [string]$ServerInstance,    
    [pscredential]$ServerCredential, 
    [pscredential]$CommandCredential,  
    [ValidateSet("Enable","Disable")]   
    [string]$Command ="Enable",          
    [switch]$NoServiceRestart,
    [int]$ConnectionTimeout = 30
)

function Get-SqlServerInstanceInternal {
    [CmdLetBinding()]
    Param(
        [Parameter(Mandatory = $true)]   
        [string]$ServerInstance,    
        [pscredential]$ServerCredential,
        [int]$ConnectionTimeout = 30
    )
    try {
        [hashtable]$cmdArgs = @{
            'ErrorAction' = 'Stop'
            'Confirm' = $false
            'ServerInstance' = $ServerInstance
            'ConnectionTimeout' = $ConnectionTimeout
        }
        if ($null -ne $ServerCredential) {
            $cmdArgs.Add('Credential', $ServerCredential)
        }
        return Get-SqlInstance @cmdArgs
    } catch {
        throw
    }
}

Import-Module SQLServer

try {
    $Properties = @('DisplayNameOrName','Status','Edition','InstanceName','DomainInstanceName','LoginMode','ServerType','ServiceStartMode','ComputerNamePhysicalNetBIOS')
    $instance = Get-SqlServerInstanceInternal -ServerInstance $ServerInstance -ServerCredential $ServerCredential -ConnectionTimeout $ConnectionTimeout
    
    [hashtable]$cmdArgs = @{
        'ErrorAction' = 'Stop'
        'InputObject' = $instance
        'NoServiceRestart' = $NoServiceRestart
        'Force' = $null
        'Confirm' = $false
    }      
                            
    if ($null -ne $CommandCredential) {
        $cmdArgs.Add('Credential', $CommandCredential)
    }                        
    
    if ($Command -eq "Enable") {
        Enable-SqlAlwaysOn @cmdArgs
    } else {
        Disable-SqlAlwaysOn @cmdArgs
    }  
    
    $result = Get-SqlInstance -InputObject $instance | Select-Object $Properties
    Write-Output $result
} catch {
    throw
}

Customize

ServerInstance string

Specifies the name of the target computer including the instance name, e.g. MyServer\Instance

ServerCredential pscredential

Specifies a PSCredential object for the connection to the SQL Server. ServerCredential is ONLY used for SQL Logins. When you are using Windows Authentication you don't specify -Credential. It is picked up from your current login.

CommandCredential pscredential

Credential to execute the command

Command string

Action to perform: Enable or Disable the Always On availability groups feature

NoServiceRestart switch

Off

Indicates that the user is not prompted to restart the SQL Server service

ConnectionTimeout int

Specifies the time period to retry the command on the target server