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    Solved Connect minecraft server to LAMP Stack's MySQL

    Minecraft
    mysql lamp feature-request minecraft
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    • T
      Trankery last edited by girish

      Title explains it already.

      I'm looking to connect my minecraft server to the lamp stack's database, but this isn't possible.

      Neither is it possible to connect to the MC Server's Database, as the hostname gets rewritten by cloudron automatically to localhost.

      Please fix this or let me know how I can make either database accessible.

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      • girish
        girish Staff last edited by

        If minecraft is on Cloudron as well, then you can just use the MySQL credentials of the LAMP app directly. You can get the credentials by opening a web terminal for the LAMP app and then running this:

           env | grep CLOUDRON_MYSQL
        

        If minecraft is one a different server, it's more complicated because the MySQL addon is completely sandboxed in the sever. But it's possible (can explain more, if this is the case).

        T 1 Reply Last reply Reply Quote 0
        • girish
          girish Staff last edited by girish

          Here's a more complete tutorial.

          • First open the web terminal for the lamp app. Get the MySQL access credentials. Note that the credentials only work inside Cloudron server.
          root@f6af0aef-2e29-4b53-a674-c2eed67eea36:/app/data# env | grep MYSQL
          MYSQL_PASSWORD=9458c46184b6337677f058fbd53c089a317e6b2f5e321b1d
          MYSQL_DATABASE=0133aefa8ed2d231
          MYSQL_PORT=3306
          MYSQL_HOST=mysql
          MYSQL_USERNAME=0133aefa8ed2d231
          MYSQL_URL=mysql://0133aefa8ed2d231:9458c46184b6337677f058fbd53c089a317e6b2f5e321b1d@mysql/0133aefa8ed2d231
          
          • SSH into the Cloudron server and get the IP address of the mysql container.
          root@localhost:~# docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' mysql
          172.18.0.5
          
          • SSH into the Cloudron server to verify that we can connect to the app's database. Carefully plug the values from the env vars into the command line below.
          root@localhost:~# mysql --user=0133aefa8ed2d231 --password=9458c46184b6337677f058fbd53c089a317e6b2f5e321b1d --host=172.18.0.5 --port=3306 0133aefa8ed2d231
          mysql: [Warning] Using a password on the command line interface can be insecure.
          Welcome to the MySQL monitor.  Commands end with ; or \g.
          Your MySQL connection id is 8037
          Server version: 5.7.29-0ubuntu0.18.04.1 (Ubuntu)
          
          Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
          Oracle is a registered trademark of Oracle Corporation and/or its
          affiliates. Other names may be trademarks of their respective
          owners.
          
          Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
          
          mysql>  show tables;
          
          • Now to connect to this mysql server from another server or your laptop, you have to create a SSH tunnel. Run this command on the other server or your laptop:
          $ ssh -N -L 127.0.0.1:3306:172.18.0.5:3306 root@my.cloudron.domain
          

          What this command is doing is connecting to your Cloudron via SSH. The -L sets up port forwarding. It forward port 3306 of 127.0.0.1 (localhost) to port 3306 of 172.18.0.5 (mysql).

          • We can now connect to port 3306 of 127.0.0.1 to access mysql:
          $ mysql --user=0133aefa8ed2d231 --password=9458c46184b6337677f058fbd53c089a317e6b2f5e321b1d --host=127.0.0.1 --port=3306 0133aefa8ed2d231
          mysql: [Warning] Using a password on the command line interface can be insecure.
          Welcome to the MySQL monitor.  Commands end with ; or \g.
          Your MySQL connection id is 8038
          Server version: 5.7.29-0ubuntu0.18.04.1 (Ubuntu)
          
          Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
          
          Oracle is a registered trademark of Oracle Corporation and/or its
          affiliates. Other names may be trademarks of their respective
          owners.
          
          Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
          
          mysql> show tables;
          Empty set (0.01 sec)
          
          • Some additional thoughts. If you want the ssh proxying to persist in your laptop/other server, use autossh. https://pronto185.com/blog/2014/01/30/how-i-use-autossh/ has a simple tutorial. For windows, there is https://persistentssh.com/ (I have never used it).
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          • T
            Trankery @girish last edited by

            @girish the server is on a completely different host, and I do not have system access.

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            • girish
              girish Staff last edited by

              Does minecraft support connecting to mysql via ssh+tcp connection? Like how mysql workbench does it - MySQL Server using TCP/IP over an SSH connection. See https://dev.mysql.com/doc/workbench/en/wb-mysql-connections-methods-ssh.html

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              • T
                Trankery @girish last edited by

                @girish No, I simply have the option to enter IP/Hostname, port, username, db name and password.

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                • girish
                  girish Staff last edited by

                  I see, I think this can be done with some socat forwarding. I will try tomorrow.

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                  • girish
                    girish Staff last edited by girish

                    How about this then. On Cloudron, install socat and also open up port 5555 in iptables. Then just forward port 5555 to the internal mysql.

                    root@localhost:~# apt install socat
                    root@localhost:~# iptables -I INPUT -p tcp --dport 5555 -j ACCEPT
                    root@localhost:~# mkdir /etc/iptables
                    root@localhost:~# iptables-save > /etc/iptables/rules.v4
                    root@localhost:~# docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' mysql
                    172.18.0.4
                    root@localhost:~# socat TCP-LISTEN:5555,fork TCP:172.18.0.4:3306
                    
                    • Then you can connect from your PC or minecraft server to the sql server using port 5555 as:
                    $ mysql --user=e89d41145799e97 --password=e97e3fb41f3e52dd2462997d6008ccc0e0b0cffb9443b4ff --host=my.cloudron.domain --port=5555 e89d41668599e97
                    mysql> show tables;
                    Empty set (0.01 sec)
                    

                    You have to install the socat as a systemd service or such to make it persist reboots. Otherwise, just use nohup socat TCP-LISTEN:5555,fork TCP:172.18.0.4:3306 &

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                    • T
                      Trankery last edited by

                      Thank you so much!

                      Maybe make it an option to disable/enable the public access to the mysql server. Would be really great. Thanks!

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                      • girish
                        girish Staff last edited by

                        @Trankery Yup, I will mark this as a feature request for a future release.

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