Making two servers talk to each other

Hello devs,

I was wondering if it is possible to use say Json or something in order for one minecraft server to ping another. What I am trying to accomplish is getting the numbers of players in a game and if a game is running on a certain server. For example, the game lobby would ping the hunger games server to check for a game, and if so, how many are alive. If this is possible, could someone please explain to me how?

Thanks,
HeyAwesomePeople

 

HeyAwesomePeople You would probably do this with sockets. You could also use a MySQL database but it would be messy.

 

HeyAwesomePeople

if I am not mistaken a lobby with different "servers" is runned through bungee cord what will result in a different place to ask this.
if you mean 2 different servers that are hosted on different places there is something you can do but it requires more then only java and bukkit knowledge.

the idea with this system is that once someone uses a command or so the plugin executes a SQL command in the code to a database. Triggers on a website detect this execution. if the 2nd server can reach that database for those triggers you are set. Then the triggers run a command to the server itself (I forgot what that is called) that uses a console command and that can display in your 2nd server.

overall you will need 1 plugin, 1 database (if better ways than that use it), 1 website for the triggers (or something that can detect it).

your plugin has to contain 2 commands or actions (at least).
1. from server to database (the way you set the triggers)
2. from database/trigger part to server (the way you can display it)

I am not familiar with the trigger part so don't ask me how to.

 

When I want two servers to talk to one another, I always use sock puppets. They are very entertaining.

 

I was doing it wrong all this time! I thought it was Glove Puppets!

 

Glove Puppets are sooooo 2012.

 

and ofc people now better ways. guess my java knowledge is not enough for this shit.

 

Use either Java Sockets or Redis

 

Yes. That is why I suggested sock puppets.

 

HeyAwesomePeople Skionz
I use MySQL . I've heard some servers use MongoDB like Hypixel. but I don't know how to use it tho.
SuperOriginal
That tutorial is old. he is using the 1.6 protocol of pinging servers. You need to find how to use the newer protocol
EDIT: fireblast709 doesn't like that youtuber (He would probably love to explain why xD)

 

first thing to do when I am home. grab my books and look for those things

 

guitargun I always do researches on the internet

 

Funergy Sockets are probably the most efficient way.

 

Skionz Yeah. but I never found how to use the 1.7 protocol

 

Redis would be best, really. Have all the servers report their player count or something. MySQL isn't particularly well-suited for this as it's not in-memory and you don't really need a bunch of player counts to be saved to disk, sockets feel a bit messy, and redis's pub/sub would be useful for other sorts of communication.

 

[OFFTOPIC]
Skionz
Actually - I made a rather good system for my server - SQL back-end.
[/OFFTOPIC]

 

Redis is a very fast and efficient option, taking 10 ms or less to run commands on a local server. This may be my resort as I have no clue how to use sockets.
I am also looking into using Bungee's API to do it, since the servers will be linked with Bungee

 

HeyAwesomePeople Then use the plugin messaging channel (that is part of bukkit) in the BungeeCord channel, but I believe there is no support for bungeecord in these forums.

 

HeyAwesomePeople use "ServerSocket" and "Socket". your minecraftserver should try to open a socket to the server which is connecting all the different minecraftserver, you want to connect to another, to another. the server which handles the connections should have the serversocket and handles everything about the connection and the communication. everytime you have a change on your minecraftserver, send the change to the server and the server will send the change to all other minecraftservers. here is a simple example for a connection with "ServerSocket" and "Socket": https://docs.oracle.com/javase/tutorial/networking/sockets/clientServer.html

 

Sockets have nothing to do with Bukkit. The version of Bukkit is irrelevant. Sockets are sockets.
Or did you mean Java?
There are some pretty straight-forward examples on the net for this.
Using sockets is an efficient way to exchange fast changing information between servers.

 

CubieX Pinging Minecraft servers has changed in the server protocol. I've used the tutorial from Pogostick29 and he used the 1.6 version <---- with this you CAN ping the player count but you can't ping the motd with it. thats why we need to update our code to the newer protocol

 

Funergy

If the other server has a different socket that reports the players, like he is intending, that is completely irrelevant. Also, please don't mention those awful tutorials on these forums.

 

I touched sockets for the first time today and have come to the conclusion that they are the easiest. They don't feel very messy and are pretty efficient. In this case they would probably be the clear choice.

 

mythbusterma I didn't post that video

 

I don't understand what you mean. If you use Java sockets to connect two servers, you can execute code on the other server to your hearts desire. You only need to make a plugin for each server or a configurable one that can send and receive data via java sockets.
You do not need to use "Pingping Minecraft servers" protocol (whatever that is...). Just listen for incoming commands via a server socket from one server and send player count or whatever information you like back to the client. (the querying server).
The minigame plugin also nees an API for providing the alive player count to your own plugin though.
"Pinging" a server for alive players in a game that's provided by a plugin is not possible with a simple minecraft server ping. You can only get the total player count on that server. But afaik nothig plugin related.

If this doesn't make sense to you, then please clarify what exactly you want. Because I can't see the connection between any minecraft related protocol and java sockets.

 

CubieX
I don't even...
I was just missunderstanding his question
<!---End of conversation--->