Setting Up DayZ Server Mods via Steam Workshop

A vanilla DayZ server is a harsh, empty experience. Workshop mods transform it into something unique: custom maps, extra weapons, base building systems, traders, and vehicles. The process of loading mods on a dedicated server is different from subscribing on the client, so this guide covers every step from finding mods to getting players connected.

How DayZ server mods work

DayZ uses SteamCMD to download mod files and loads them through startup parameters. Each mod has a Workshop ID (the number in the Steam Workshop URL). The server needs the mod files in its directory, the mod's signing key in the keys folder, and the mod name in the startup command line.

Step 1: Find mods and note their IDs

Browse the DayZ Workshop on Steam. When you find a mod you want, copy the Workshop ID from the URL. For example, if the URL is https://steamcommunity.com/sharedfiles/filedetails/?id=1559212036, the ID is 1559212036.

Popular starter mods include:

• CF (Community Framework): required dependency for many other mods.
• Trader Mod: adds NPC traders with configurable inventories and prices.
• BuilderItems: expanded base building pieces.
• MuchStuffPack: furniture and decoration items for bases.
• Code Lock: combination locks for doors and gates.

Step 2: Download mods with SteamCMD

On your server, use SteamCMD to download each mod:

steamcmd +force_install_dir /path/to/dayz-server \
  +login your_steam_username \
  +workshop_download_item 221100 1559212036 \
  +quit

The number 221100 is DayZ's Steam App ID. Replace the last number with each mod's Workshop ID. Downloaded mods land in a steamapps/workshop/content/221100/ subfolder.

Step 3: Link or move mod folders

DayZ expects mod folders in the server root directory, prefixed with @. Create symlinks or copy the downloaded folder:

ln -s /path/to/steamapps/workshop/content/221100/1559212036 /path/to/dayz-server/@CF

Use the mod name after the @ sign, matching whatever the mod author specifies.

Step 4: Copy signing keys

Each mod includes a keys or key folder containing .bikey files. Copy every .bikey file into the server's main keys directory. Without these, clients using the mod will be kicked for signature verification failure.

Step 5: Add mods to the startup line

Edit your server startup script or panel configuration to include the -mod parameter:

-mod=@CF;@TraderMod;@BuilderItems;@MuchStuffPack;@CodeLock

Order matters. Dependencies must load before the mods that need them. CF typically goes first.

Step 6: Configure and test

Start the server and watch the log output. Each mod should show a loaded message. Join with a client that has the same mods installed (subscribe to them in the Workshop). If you get kicked, check that your client mod versions match the server versions and that all keys are in place.

Keeping mods updated

Mod authors push updates through the Workshop. Re-run the SteamCMD download command to pull the latest version. After updating, restart the server and make sure clients update their mods too. A version mismatch between server and client is the number one cause of connection failures on modded DayZ servers.

Troubleshooting tips

• Mod not loading: Check the server log for errors. Verify the folder name matches the -mod parameter exactly, including capitalization on Linux.
• Client kicked for bad signature: Copy the mod's .bikey file into the keys folder and restart.
• Server crashes on startup: Remove mods one by one to isolate the conflict. Check if all dependencies are present.