Minecraft – How to make a Minecraft Server private

So, I guess you have a Linux VPS or dedicated server, where you can install whatever you want? Good.

For this, we use the bukkit server.

Here are some instructions:

1. Download CraftBukkit's latest build: CraftBukkit - Recommended Build 
2. Put the .jar in a folder, for this example we'll use a generic one: ~/craftbukkit 
3. Move to the above directory in terminal with 'cd ~/craftbukkit' 
4. Create a new file in the minecraft folder and name it craftbukkit.sh 
5. Edit the file and paste this into it: 

#!/bin/sh BINDIR=$(dirname "$(readlink -fn "$0")") cd "$BINDIR" java -Xmx1024M -jar craftbukkit.jar -o true

6. Make the file executable, either by running "chmod +x ~/craftbukkit/craftbukkit.sh" in a terminal, or by changing the permissions in the file's properties. 
7. Then, in terminal, type '~/craftbukkit/craftbukkit.sh' to run to start the server.  
8. When you're done playing around, issue the "stop" command in console. 

You can run bukkit like described above, but there are other options - you can run the server permanently with an init script or run it with an ASCII interface

EDIT:

Reread your question, could be that I misunderstood. So here is another link to something that should be what you need - Bukkit Webby

Bukkit Webby is a lightweight web administration that is easy and fast to setup It's made of two components :

WebbyBukkitPlugin is a Bukkit Plugin that interacts with Bukkit, read your server log, find all online users, etc.

WebbyRTK is a RTK module that interacts with RemoteToolkit and run the webserver. Even if Bukkit has been shutdown, the webserver will persists and allow you to restart Bukkit.

Current Features

• Server administration based on Bukkit Remote Toolkit (Start / Stop / Restart / Reload)
• Online configuration files
• Online server log
• Backup management (manual backup, automated restore)
• Easy installation : drop the jars and files as any bukkit plugins, setup port, login and password for webby and RTK, and you are done !
• NO APACHE NEEDED !

There are tons of other bukkit plugins for website administration. If my suggestion is not what you want, you can check the plugins.

I sorted it out by using the following if in my shell script:

if ! screen -list | grep -q $SCREEN_NAME; then
    ONLINE=1
else
    ONLINE=0
fi

Where $SCREEN_NAME is the server's unique screen name.