Public Dns Server Tool Download
Chieko Topalian
The servertool command provides the command-line interface for developers to register, unregister, start up, and shut down a persistent server. Command-line commands let you obtain various statistical information about the server. See Commands.
This options is required. It specifies the host machine on which the name server runs and listens for incoming requests. The nameserverhost value must specify the port on which the orb is running and listening for requests. The value defaults to localhost when this option is not specified. If orbd and servertool are running on different machines, then you must specify the name or IP address of the host on which orbd is running.
Registers a new persistent server with the Object Request Broker Daemon (ORBD). If the server is not already registered, then it is registered and activated. This command causes an installation method to be called in the main class of the server identified by the -server option. The installation method must be public static void install(org.omg.CORBA.ORB). The install method is optional and lets developers provide their own server installation behavior, such as creating a database schema.
Unregisters a server from the ORBD with either its server ID or its application name. This command causes an uninstallation method to be called in the main class of the server identified by the -server option. The uninstall method must be public static void uninstall(org.omg.CORBA.ORB). The uninstall method is optional and lets developers provide their own server uninstallation behavior, such as undoing the behavior of the install method.
Locates the endpoints (ports) of a specific type for all ORBs created by a registered server. If a server is not already running, then it is activated. If an endpointType value is not specified, then the plain/non-protected endpoint associated with each ORB in a server is returned.
Locates all the endpoints (ports) registered by a specific Object Request Broker (ORB) of registered server. If a server is not already running, then it is activated. If an orbid is not specified, then the default value of "" is assigned to the orbid. If any ORBs are created with an orbid of empty string, then all ports registered by it are returned.
Shut down an active server that is registered with ORBD. During execution of this command, the shutdown method defined in the class specified by either the -serverid or -applicationName parameter is also called to shut down the server process.
The following requirements are unofficial, but are the general consensus amongst official Helpers in the Valheim Discord. You may still be able to run a dedicated server using less than the listed requirements. This is just a guided starting point. Note that the more players you have, the higher these requirements will need to be to sustain performance!
The server is not CPU heavy after the world generation is done. Instead, it will load all data into memory, so it will use a considerable amount there. In general, a fresh world usually uses around 1.8 - 2.4 GB of RAM, each loaded areas (where players are active) take around 100 - 300 MB, but high instance areas could demand a lot more. Whenever someone enters a new area, the server will generate that on the fly; At times of exploration the CPU load can be demanding.
The dedicated server is responsible for relaying RTC communication and providing remote map data, when enabled, advertising the server in the Steam Server Query (in the "other" region). The server does not simulate any of the game logic, it is not server-side authoritative. The authority role is claimed by the clients on a locally isolated areas they are interact with. However, the server will do some authoritative jobs; When a client connects it validates Steam IDs using the Steam API, checks its banned, permitted lists, and validates a password and version code.
The dedicated server runs a few services into their own sub-process to be able to serve the RTC relay keep the map data consistent without consuming all the memory and not block each of the tasks.These processes are the following:
When enabled (which it is by default), the Game server will provide an A2S port that is used to get server information for Steam games. The state is reported with "Game server " and "Game server connected error" where the latter is and indication of the server not reaching the Steam Connection Manager servers; Check their availability through steamstat.us (unofficial), or alternatively look for the connection log.
The way Steam Query Servers work is that the Game server provides an implementation of the A2S protocol[1], and will register itself with the Steam Master Servers. Once notified, the Master Server will query for an A2S information every 5 minutes, and when fails, it will remove the server from its list.
Every 10 minutes, the server will go through the loaded areas and remove anything that is no longer needed in Memory. This is reported by "Unloading X unused Assets/Serialized files" lines in the console. The relay is not paused while this is running.
Every 20 minutes, the server will clone the memory and then write it to the storage. While the memory cloning is on-going, all relay operations are on hold; This usually takes around 20 - 300 ms, while the storage writing can take up to a few seconds. Relay operations are continued right after the memory clone is done, and the storage operation runs in the background.
The server uses UDP packets on every connection; The RTC, Steam CMs, and A2S Server Information. Having a DNS and access to the internet is required to run the server as the Steam API has to be called for validating the client connections, and when enabled, the the Steam Connection Managers needed to be reached.
The guide below is for hosting a dedicated server. You can also play using the built-in server hosting in the Valheim client by selecting the "Start Server" radio button when loading your world. The difference between using the client to host and the dedicated server option is that the server will shut down when you exit the client, but a dedicated server will stay on so long as the program is running and there is an internet connection.
When you want to shut down the server, DO NOT USE THE CLOSE BUTTON on the window. In order to let the server properly shut down, send a SIGINT via the CTLR+C combination to it ONCE (confirm with a Y in windows). This will make sure that the server is shut down with a world save.
To allow other players to connect to your server from the internet you will need to set up port forwarding. This is usually configured on your router so consult its documentation or read a guide to find the steps on how to do this. There is a website ( ) that is a useful resource for this. The port numbers you need to forward are 2456-2457.
Port triggering is also possible, but keep in mind that will only expose the server when a local network connection is using the server, meaning it is essentially the same if you were using the in-game hosting option; The server host (or someone on the same network) would need to be connected to the server.
This link requires that the A2S port is running (2457 by default). What it does is that it tells steam to connect to a server, it will prompt the password input outside of Valheim, launch Valheim and you will need to type your password again. The in-game password field the only one that works, the steam window field is not recognised by the game yet, so you can type anything there.
This link will instruct Valheim to connect to a server directly, works even when the A2S port is not enabled (-public 0). The % characters are needed for most places where you cannot control the embed link correctly, it will translate to the runtime arguments: "+connect [:port]"
Being an admin allows only the use of admin-specific console commands to manage your server (kick, ban, etc). It does not give access to any other commands such as cheats or debugmode. To make yourself an admin on your server, find your steamID64 using one of the above steps and add it to the adminlist.txt.
Currently, the server will create a random seed and give it the name you specify in the -world parameter of the start_headless_server.bat file detailed above, so if you want to host a server with a specific seed, you will need to use a workaround by creating the world by the client and uploading the required files.
If your server is a different computer, you can find the world files in %UserProfile%\AppData\LocalLow\IronGate\Valheim\worlds. Using the example above, they will be named Dedicated.db and Dedicated.fwl. Simply copy/paste these files to the same directory on your server and update your start_headless_server.bat file's -world parameter to your chosen world name (not the seed name).
Every time the game updates, you will also need to update your dedicated server. If the dedicated server version does not match the game version then players cannot connect. It is sufficient (in recent patches) simply to update the Valheim Dedicated Server tool in Steam - No need to use third party tools.
(Windows): Your worlds are stored in [Drive Letter]:\%UserProfile%\AppData\LocalLow\IronGate\Valheim\worlds. This folder is used by the dedicated server tool and the Valheim game's own system. You can interchangeably choose to play using the dedicated server or the game hosting. It is not suggested to do this simultaneously with the same world - critical errors may occur.
You can back up your world and progress simply by copying the .db and .fwl files for your world and placing them in a folder. Additionally, to transfer your world and progress to another player (such as your friend who wants to host a dedicated server), simply transfer both the .db and .fwl files. Make sure you either compress them or use BINARY mode for your transfer!
Some sources also point at the server being bandwidth limited, that is usually not a problem, or a problem of hardware that would be hard to replace. The thing is that the host, the chunk-master will need to handle many UDP packets, and outside of the host hardware CPU limitations, you can run into networking hardware not capable for the server side. Clients usually fine, but the Dedicated Server will have multiple times the load of a single client in terms of packet counts. Some mods do try to combat this by either compressing the sent packets or grouping them, but the real solution is to host your server in a more capable environment.
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