Mitme Minecrafti serveri ühekordne port

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After hosting couple of Minecraft servers for friends and family. I was giving them an IP and port to the servers, after creating couple different server some vanilla and modded servers. Every time creating a new server, I needed to configured a port forward rule, on router. I was starting to get annoyed by it, and having specifying port number.
I want have a neater IP without specifying a port, and using domain names specify specific server, and if I want to run 2 dedicated server and have multiple Minecraft server, I had to remember, what public ports were assign to which machine.

Install HAProxy using your distribution’s package manager:

  • Ubuntu and Debian:
    apt install haproxy
  • Arch Linux:
    pacman -S haproxy
  • Fedora Linux:
    dnf install haproxy

After installing HAProxy, navigate to the configuration directory:

cd /etc/haproxy/

It’s a good idea to back up the default configuration file before making changes:

mv haproxy.cfg haproxy.cfg.bak

Now create a new haproxy.cfg file.

frontend minecraft
    bind *:25565
    mode tcp
    tcp-request inspect-delay 5s

    acl is_mc_vanilla payload(4,21) -m sub vanilla.example.home
    acl is_mc_creative payload(4,22) -m sub creative.example.home
    acl is_mc_modded payload(4,20) -m sub modded.example.home

    tcp-request content accept if is_mc_vanilla || is_mc_creative || is_mc_modded

    use_backend vanilla_backend if is_mc_vanilla
    use_backend creative_backend if is_mc_creative
    use_backend modded_backend if is_mc_modded

backend mc_vanilla_backend
    server mc_vanilla 192.168.1.5:25565
    
backend mc_creative_backend
    server mc_creative 192.168.1.5:25566
    
backend mc_modded_backend
    server mc_modded 192.168.1.7:25565

The function payload(Offset, Length). takes two parameters:

  • Offset: The starting position of the scan.
  • Length: Determinant how many bytes will be scanned.

Note:
When calculating Length, you must add +1 byte to the domain length.
This ensures the full domain is scanned correctly.

Now after configuring proxy, now If I add a new server in the future, I don’t have to remember what port was assign on my router, I just need to remember what domain was assign.

Here some option quick characters counter

Linux and MacOS bash:

echo "example.com" | wc -c

Windows PowerShell:

echo (("example.com".Length + 1))

Python option:

print(len("example.com")+1)

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