1. Create a new folder where you’d like Radarr-4K to live. Most use a similar place such as
    C:\ProgramData\Radarr-4K
  2. Back in Command Prompt, create the new Radarr-4K service using nssm install Radarr-4K. A popup window will open where you can type your parameters for the new instance. For this example, we will use the

    following:

Note that Arguments points to the new folder created in step 1. This is crucial, as it keeps all the data files from both instances in

separate locations.

  1. Click Install service. The window should close and the service
    will now be available to run.
  2. Continue to Configuring Radarr-4k

Configuring the NSSM Exit Action correctly should allow Radarr to update and restart multiple instances with no additional scripts. If the restart delay is not configured by default it will restart the instance immediately.

This can prevent updates from being applied and can result in the following error Radarr was restarted prematurely by external process.

  1. Create a new File and name it RadarrInstancesChecker.ps1 with the below code.
  2. Edit the script with your actual service names, IP, and ports. If you are running in Tray mode, you must create Scheduled tasks to start each Radarr instance and use those Task names in the script below.
  3. Create a scheduled task to run the script on a repeating schedule.
################################################################################################
### RadarrInstancesChecker.ps1                                                               ###
################################################################################################
### Keeps multiple Radarr Instances up by checking the port                                  ###
### Please use Radarr´s Discord or Reddit for support!                                       ###
### https://wiki.servarr.com/radarr/installation#windows-multi                               ###
################################################################################################
### Version: 1.1                                                                             ###
### Updated: 2020-10-22                                                                      ###
### Author:  reloxx13                                                                        ###
################################################################################################



### SET YOUR CONFIGURATION HERE ###
# Set your host ip and port correctly and use your service or scheduledtask names!

# (string) The type how Radarr is starting
# "Service" (default) Service process is used
# "ScheduledTask" Task Scheduler is used
$startType = 'Service'

# (bool) Writes the log to C:\Users\YOURUSERNAME\log.txt when enabled
# $false (default)
# $true
$logToFile = $false


$instances = @(
    [pscustomobject]@{   # Instance 1
        Name = 'Radarr-V3'; # (string) Service or Task name (default: Radarr-V3)
        IP   = '192.168.178.12'; # (string) Server IP where Radarr runs (default: 192.168.178.12)
        Port = '7873'; # (string) Server Port where Radarr runs (default: 7873)
    }
    [pscustomobject]@{   # Instance 2
        Name = 'Radarr-4K'; # (string) Service or Task name (default: Radarr-4K)
        IP   = '192.168.178.12'; # (string) Server IP where Radarr runs (default: 192.168.178.12)
        Port = '7874'; # (string) Server Port where Radarr runs (default: 7874)
    }
    # If needed you can add more instances here... by uncommenting out the below lines
    # [pscustomobject]@{   # Instance 3
    # Name='Radarr-3D';    # (string) Service or Task name (default: Radarr-3D)
    # IP='192.168.178.12'; # (string) Server IP where Radarr runs (default: 192.168.178.12)
    # Port='7875';         # (string) Server Port where Radarr runs (default: 7875)
    # }
)


### DONT CHANGE ANYTHING BELOW THIS LINE ###


###
# This function will write to a log file or in console output
###
function Write-Log
{
    #Will write to C:\Users\YOURUSERNAME\log.txt
    
    Param(
        $Message,
        $Path = "$env:USERPROFILE\log.txt" 
    )

    function TS { Get-Date -Format 'hh:mm:ss' }
    
    #Console output
    Write-Output "[$(TS)]$Message"
    
    #File Output
    if ($logToFile)
    {
        "[$(TS)]$Message" | Tee-Object -FilePath $Path -Append | Write-Verbose
    }
}


Write-Log 'START ====================='


$instances | ForEach-Object {
    Write-Log "Check $($_.Name) $($_.IP):$($_.Port)"
    
    $PortOpen = ( Test-NetConnection $_.IP -Port $_.Port -WarningAction SilentlyContinue ).TcpTestSucceeded 
    
    if (!$PortOpen)
    {
        Write-Log "Port $($_.Port) is closed, restart $($startType) $($_.Name)!"

        if ($startType -eq 'Service')
        {
            Get-Service -Name $_.Name | Stop-Service
            Get-Service -Name $_.Name | Start-Service
        }
        elseif ($startType -eq 'ScheduledTask')
        {
            Get-ScheduledTask -TaskName $_.Name | Stop-ScheduledTask
            Get-ScheduledTask -TaskName $_.Name | Start-ScheduledTask
        }
        else
        {
            Write-Log '[ERROR] STARTTYPE UNKNOWN! USE Service or ScheduledTask !'
        }
    }
    else
    {
        Write-Log "Port $($_.Port) is open!"
    }
}

Write-Log 'END ====================='

Below is an example script to create a Radarr4K instance. The below systemd creation script will use a data directory of /var/lib/radarr4k/. Ensure the directory exists or modify it as needed.

cat << EOF | sudo tee /etc/systemd/system/radarr4k.service > /dev/null
[Unit]
Description=Radarr4k Daemon
After=syslog.target network.target
[Service]
User=radarr
Group=media
Type=simple

ExecStart=/opt/Radarr/Radarr -nobrowser -data=/var/lib/radarr4k/
TimeoutStopSec=20
KillMode=process
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF

sudo systemctl -q daemon-reload

sudo systemctl enable --now -q radarr4k