tModLoader repo : https://github.com/tModLoader/tModLoader/ Hopefully the tmod team will come up with a better implementation that they can maintain.

Currently, you need the following files and directories on your local machine before starting the server :

• serverconfig.txt
• a folder with all your mod files (.tmod) and the enabled.json file
• a folder with all your maps
• if you want to download mods from the steam workshop, the install.txt file All those files are described in the tmodloader wiki.

READ AND EDIT THE docker-compose.yaml FILE FIRST. It contains mount paths for the files and directories mentioned above. Then run :

docker-compose up --build

Edit the following commands to match the paths on the host :

export MODS_DIRECTORY=/path/to/mods/directory
export WORLDS_DIRECTORY=/path/to/worlds/directory
export SERVERCONFIG_PATH=/path/to/serverconfig.txt
export INSTALL_TXT=/path/to/install.txt
docker build -t tmodloader . 
docker run -p 7777:7777 --name tmodloader --rm \
  -v $WORLDS_FOLDER:/root/.local/share/Terraria/tModLoader/Worlds \
  -v $MODS_FOLDER:/root/.local/share/Terraria/tModLoader/Mods \
  -v $SERVERCONFIG_PATH:/root/terraria-server/serverconfig.txt \
  -v $INSTALL_TXT:/root/terraria-server/install.txt \
  tmodloader