Valheim Dedicated Server: Setup, Sizing and the World File

Valheim is one of the friendlier survival servers to host. It is modest on memory, the install is small, and a group of ten does not need special hardware. The one thing worth being careful about is the world file.

Install

The dedicated server is Steam app 896660, anonymous:

steamcmd +force_install_dir /home/container +login anonymous \
         +app_update 896660 validate +quit

We provision Valheim with 2 GB of RAM and 10 GB of disk as the floor — noticeably lighter than Rust or ARK on the same player count.

Realistic sizing

Valheim's server load tracks explored and built area more than player count. Ten players in one base is cheaper than four players who have each sailed to a different continent, because the world keeps what has been discovered.

For a typical friends-group server, 2 GB is genuinely enough. If your world has been running for months and players have explored widely, move up — but do it because you measured, not because a table told you to.

The world file is the whole server

Everything lives in the world file. Not player inventories in a database, not builds in a separate store — one file, and its backup. This has a consequence: a corrupted world file is a lost server, and corruption most often happens when the process is killed mid-save.

Two habits follow:

1. Stop the server cleanly. Let it finish writing. A hard kill during a save is the single most common way people lose a Valheim world.
2. Keep more than one backup generation. Corruption is not always noticed immediately — if you keep only the newest backup, you may have already overwritten the last good one.

Valheim itself writes .old companion files for this reason. Treat them as a last resort, not as your backup strategy.

Password requirements catch people out

The server refuses to start if the password is too short or if it appears inside the server name. It is a small thing, but it produces a server that silently fails to come up, and the cause is not obvious from the outside.

Crossplay and modding

Enabling crossplay widens who can join. Mods narrow it — a modded server requires every player to run a matching setup, and a mod that falls behind a game update will keep your players out until it catches up.

Decide which you care about before you build a community around it. Switching later means telling people their setup no longer works.