SMSM: Simplistic Minecraft Server Manager

A Windows service to help you run a Minecraft server, taking care of only the operation, and getting out of the way otherwise.

This is intended for people who know how to set up and configure a Minecraft server without hand-holding.

Features:

Runs as a Windows service
Supports multiple independent instances on the same machine
Allows scheduling of actions
Can take backups of the world
Doesn't fuck up your configs
Doesn't use Docker

Thanks to AMP for giving me the incentive to learn how to implement a Windows service :)

⚠ SMSM doesn't make any attempt to be secure. The remote management utility connects via a named pipe, which may be network-accessible in some configurations. It usually requires administrator privileges to access, but this can be disabled if you misconfigure Windows. Please verify that access is properly restricted after installation!

Installation

Prerequisite: .NET 6

Make sure your Minecraft server is set up and ready to run.
Place the SMSM files into a general location (e.g. C:\Program Files\SMSM\)
Copy the sample config SampleConfig.json to a convenient location (recommended in the same location as the server .jar), and optionally rename it.
Edit the config, making sure to set Name, ServerDir, JavaPath, ServerJar, and the Schedule. Change any other settings you desire. See below for explanations.
Open an Administrative PowerShell window, and cd to the location where you placed SMSM.
Run .\Install-SMSM.ps1 and answer the prompts. Don't close this window when done.
Your service should now be installed. Verify by using services.msc, look for the name Minecraft Server ____ (SMSM). It should be stopped, do not start it yet.
Assign the user NT Service\SMSM-<Name> (as shown by the install script) write permissions to the folder where SMSM is installed, as well as the entire Minecraft server folder and all contents. This is the service account that the server will run under, and it has minimal permissions.
Start the service. This is only required this first time, it will auto-start at boot from now on.
Make sure the service shows as Running, and you receive no errors trying to start it.
Your Minecraft server should be running. You're done!

You can install multiple servers, by reusing the same SMSM files, and simply creating another config .json pointing to a different server. Just repeat the above steps for the second config.

Management

To manage the server, start the management utility from an administrator PowerShell window: .\SMSMRemoteTool.exe <Name>, where Name is the name used to install the service (should be the Name in the config .json).
If you are successfully connected, you should see -> Connected to management interface on "<Name>". You can now enter any command from the section below.
Once you are done, type exit and press enter. This stops the remote session, but does not turn off the server. To completely shut down the server, use the stop command, and then stop the service.

Configuration

All settings are configured in the config .json file you selected when installing the service. The below table explains the options available.

Option	Required?	Default	Type	Description
`Name`	Required	N/A	string	The name of this instance. Used to name the service, access the management interface, and in various other locations. A name without spaces is recommended.
`ServerDir`	Required	N/A	Path string	The location of the Minecraft server files. The server JAR should be located in this folder.
`JavaPath`	Recommended	Java on PATH	Path string	A path to `java.exe`, including the filename. If not specified, SMSM attempts to use your system default Java installation, which may be incorrect, so it is recommended to set this.
`MinRAM`	Optional	1024	int	The amount of RAM to assign as the minimum, in MB.
`MaxRAM`	Optional	2048	int	The amount of RAM to assign as the maximum, in MB.
`JavaArgs`	Optional	`""`	string	Additional arguments to pass to Java (not the server).
`ServerJar`	Required	N/A	string	The name of the server JAR file. Do not include the path.
`ServerArgs`	Optional	`""`	string	Additional arguments to pass to the server (not Java).
`AutoStart`	Optional	`true`	bool	Whether to start the Minecraft server when SMSM starts.
`BackupsToKeep`	Optional	`20`	int	The number of backup ZIP files to keep. If there are more than this number, the oldest ones will be deleted until this number is reached.
`BackupExclusions`	Optional	None	string array	A list of non-case-sensitive exclusion patterns for files and directories to exclude from being backed up. Wildcards are supported, such as `?`,``,`*`.
`Schedule`	Optional	None	object array	A list of scheduled tasks that SMSM will do, regardless of whether the Minecraft server is running or not. See the below section for further details.

Commands

These are used both by the remote management tool, and by the task scheduler.

Task	Argument	Description
`"start"`	None	Starts the server if it is not running.
`"stop"`	None	Stops the server if it is running.
`"restart"`	None	Stops the server if it is running, then starts it.
`"command"`	Command	Sends the command in the argument as-is to the server console.
`"message"`	Text	Sends the message text out to all players as a server-wide announcement.
`"save"`	None	Saves all non-saved changes to the world.
`"backup"`	None	Disables auto-saving, takes a backup of the world, then re-enables auto-saving.

Scheduling Tasks

SMSM has a simple task scheduler built in. You can specify as many tasks as you want, but the order in which they run if scheduled at the same time is not guaranteed.

Schedule Definition

To define a scheduled task, add an object to the "Schedule" array. Specify a "Name" and the "Task" (see Commands above). Then specify the times you want to run the task using "Minutes", "Hours", "Days", and "Weekdays". It will run if all 4 lists have a match for the current time. By default, each of these is set to include all possible values. Override any you want to specify.

Examples:

Every 5 minutes:

"Minutes": [0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55]

Every 2 hours at xx:34 (00:34, 02:34, 04:34, etc):

"Minutes": [34],
"Hours": [0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22]

Every Wednesday at 01:50:

"Minutes": [50],
"Hours": [1],
"Weekdays": ["Wed"]

Every hour, but only on the 3rd of every month:

"Minutes": [0],
"Days": [3]

Schedule Exceptions

Schedule exceptions are defined in a similar way to the base schedule, in that all specified items must match. However, they default to nothing if that item is not specified. You can use the string "All" to include all possible items for a value.
They are placed in the "Exceptions" object array, and any number of exceptions can be added for each scheduled task.

Every 5 minutes, except at 03:10

"Minutes": [0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55],
"Exceptions":
[
    {
        "Minutes": [10],
        "Hours": [3],
        "Days": "All",
        "Weekdays": "All"
    }
]

Every hour, except on Sundays at midnight or Wednesdays at noon:

"Minutes": [0],
"Exceptions":
[
    {
        "Minutes": "All",
        "Hours": [0],
        "Days": "All",
        "Weekdays": ["Sun"]
    },
    {
        "Minutes": "All",
        "Hours": [12],
        "Days": "All",
        "Weekdays": ["Wed"]
    }
]

Every Wednesday at 01:50, except if it is the 1st of the month:

"Minutes": [50],
"Hours": [1],
"Weekdays": ["Wed"],
"Exceptions":
[
    {
        "Minutes": "All",
        "Hours": "All",
        "Days": [1],
        "Weekdays": "All"
    }
]

Known Issues

Starting the remote tool before the SMSM service is ready will cause it to connect, but will not be able to send commands, and will cause the service to lose its server process.
- Recommended workaround: Do not start the remote tool when the SMSM service isn't running.
The service does not gracefully shut down the Minecraft server if Windows is shutting down.
- Recommended workaround: Stop the server via the remote tool, or stop the service via services.msc before shutting down or restarting Windows.

CaiB / SMSM