How to update a DayZ server and its mods

By Niko Catarino

Updated 8 October 2026

Update a DayZ server during a maintenance window: stop the game, verify a recovery copy, update the server application and required mods, review mission-file changes, then join with an updated client. Updating the executable alone does not update every mod or preserve every edited stock file.

This procedure covers DayZ PC servers. On VYKIX, use the documented VXPanel controls below. On a self-managed Windows or Linux host, use SteamCMD against the existing installation directory.

Prepare a recovery copy

Record the current server build, stable or experimental branch, active mission, launch arguments and mod load order. Read the game’s update notes and the installed mods’ migration instructions before stopping the server.

Warn players, stop DayZ through its normal administration controls, and wait for the process to exit. Prevent a restart schedule or supervisor from starting it during file replacement.

Data to preserve	What to check
Server configuration and launch settings	The file selected by -config, active mission template, ports and instance settings.
Mission files	The active mpmissions directory, custom XML files and their cfgeconomycore.xml registrations.
World persistence	The storage location used by this instance. Check custom -storage settings as well as the mission’s storage directories.
Profiles and mod-owned data	The actual -profiles path, admin permissions, mod configuration and any separate databases.
Installed packages and signing keys	Mod folders, Workshop IDs, versions, load scope and keys needed to identify the previous configuration.

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Check the backup’s contents, date and size. Keep an external copy of irreplaceable data. VXPanel backups include their configured paths only; follow Backups and restores before assuming that a listed archive covers the world and every mod.

An update does not require a routine world wipe. If the game or a mod author requires a migration or reset, review that specific requirement separately.

Update through VXPanel

VXPanel automatically updates the game and mods and restarts the server. You can delay an update while you prepare for maintenance. Review mod migration requirements and keep a recovery copy before the update.

1. Open Mods and use Check updates to review installed Workshop bindings.
2. Check Advanced settings for the service’s update handling, including Restore mods on startup, Shutdown on game update and Shutdown on mod update. Review the notification countdown and maintenance schedule.
3. Delay the automatic update if you need time to prepare. An update check reports timestamps; it does not replace files. Update catalog refreshes cached Workshop metadata, not the installed packages.
4. Let the automatic update and restart finish before submitting another request.
5. Refresh the installed-mod catalog, repeat Check updates, and inspect the current Console and Logs.

Installed unknown or Latest unknown means the panel lacks a usable timestamp, so you can’t tell from that result whether the package is current. Local bindings need the update method supplied by their author.

Update a self-managed server with SteamCMD

Use the same install directory and branch as the running server. A successful download to a different directory leaves the service’s existing files unchanged. These examples update the stable DayZ Server application, 223350.

For Windows, replace the paths and Steam login name, then run in PowerShell:

& 'C:\SteamCMD\steamcmd.exe' +force_install_dir 'C:\DayZServer' +login YOUR_STEAM_LOGIN +app_update 223350 +quit

For Linux, run as the account that manages this installation, replacing both paths and the login name:

/home/dayz/steamcmd/steamcmd.sh +force_install_dir /home/dayz/servers/dayz-server +login YOUR_STEAM_LOGIN +app_update 223350 +quit

Enter any password or Steam Guard challenge when prompted. Keep credentials out of scripts, shell history and screenshots. Bohemia’s Linux server instructions document the SteamCMD installation/update method and distinguish stable application 223350 from experimental 1042420. Keep the server and clients on matching branches.

Wait for SteamCMD to report that the application update completed successfully. Save an error before retrying; disk space, account access or a download failure can leave maintenance incomplete.

The command above omits validate. Valve’s validation guidance explains that validation checks installed application files against Steam’s copies and overwrites changed stock files. Use it when repairing an installation, after backing up and planning to review those files. An ordinary update can also replace files changed by the release.

Plan updates separately from restarts

Keep modded production updates attended. A game download can leave Workshop packages, dependencies or mission files needing a separate change, and the updated set needs a player join before you reopen. A scheduled restart alone does not perform these updates.

For a self-managed Linux server, the native countdown and systemd example handles warnings and relaunching the installed game. An unattended updater would also need a verified backup of the stopped server, usable Steam authentication, a bounded download attempt and a failure path that leaves the game stopped. Keep the manual SteamCMD procedure above until those steps have been rehearsed on your installation. VXPanel has its own automatic game/mod update and restart workflow, described above; this self-managed example does not configure it.

Prepare game and Workshop downloads on a Linux schedule

You can schedule the downloads and keep installation attended. The preparation script downloads Stable server application 223350, then downloads each listed DayZ Workshop package and copies it into a separate staging folder. It leaves the running server alone. Choose a quiet period because the downloads still use the host’s disk and network capacity.

Use a dedicated non-root Linux account, such as dayz-updater, with its own SteamCMD installation and cache. Its files must be separate from the running server, including any mod folders loaded through symbolic links. The script needs Bash 5 and GNU timeout, realpath, find, sort, xargs, sha256sum and cp. Allow space for a fresh server installation, the complete listed mod set and the Workshop cache.

Before scheduling it, sign in interactively with that account’s SteamCMD and complete Steam Guard. Confirm the account can download the server and required packages. Record the Workshop directory SteamCMD actually reports; the example below assumes /home/dayz-updater/steamcmd/steamapps/workshop/content/221100. Exit with quit so the next run can use the cached login. Keep passwords and Guard codes out of the script and unit file. A renewed authentication challenge requires another attended sign-in.

Save the script as /home/dayz-updater/bin/prepare-update.sh and create /home/dayz-updater/staging, both owned by dayz-updater. Run this example as that account after replacing the login name and checking every path:

/bin/bash /home/dayz-updater/bin/prepare-update.sh \
  /home/dayz-updater/staging \
  /home/dayz-updater/steamcmd/steamcmd.sh \
  YOUR_STEAM_LOGIN \
  /home/dayz-updater/steamcmd/steamapps/workshop/content/221100 \
  '1559212036:@CF'

The final argument maps a Workshop ID to its destination folder. This example lists only CF. Add one ID:@Folder argument for every required package and dependency, using the names in your launch configuration. The script rejects duplicate IDs and folder names; it doesn’t discover dependencies or decide their load order. Packages obtained outside Workshop still need their author’s update method.

Inspect staging/pending/logs, game, mods, mod-list.txt and SHA256SUMS. PREPARED.txt appears only after the commands report success, each package has been copied and the local hashes pass. It means files are ready for review; compare their versions and release notes before testing them together. In particular, a hash records the copied bytes, not compatibility between releases.

Result	Next action
Authentication, download or 30-minute command timeout	Read the relevant log. The pending folder remains, and the next run refuses to overwrite it. Resolve the cause before trying again.
Workshop success path differs from your configured cache	Check the path SteamCMD reported. The script stops instead of copying an older package from another cache.
Missing game file, empty package, symbolic link or failed copy	Inspect the pending set and package layout. No prepared marker is written.
A previous run or pending set exists	Wait for the active job to exit. Keep its logs and move the inspected set out of pending before another run.

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After an attended preparation and rehearsal on your Linux host, save /etc/systemd/system/dayz-prepare-update.service as an administrator. Substitute the same tested arguments, including the complete mod list:

[Unit]
Description=Prepare DayZ update files for review
Wants=network-online.target
After=network-online.target

[Service]
Type=oneshot
User=dayz-updater
WorkingDirectory=/home/dayz-updater
UMask=0077
TimeoutStartSec=2h
KillMode=control-group
ExecStart=/bin/bash /home/dayz-updater/bin/prepare-update.sh /home/dayz-updater/staging /home/dayz-updater/steamcmd/steamcmd.sh YOUR_STEAM_LOGIN /home/dayz-updater/steamcmd/steamapps/workshop/content/221100 1559212036:@CF

Save the matching /etc/systemd/system/dayz-prepare-update.timer:

[Unit]
Description=Schedule DayZ update preparation

[Timer]
OnCalendar=*-*-* 03:00:00 UTC
Persistent=false

[Install]
WantedBy=timers.target

This requests a daily run at 03:00 UTC. Persistent=false avoids catching up a missed calendar run when the timer is activated. Review systemd’s timer settings against the version installed on your host. The service begins stopping an unfinished job after two hours; the script gives each SteamCMD command 30 minutes, with a further 30 seconds before forced termination. Those limits apply to the download process, never to DayZ.

Verify the two unit files first. Resolve any errors before enabling the timer:

sudo systemd-analyze verify /etc/systemd/system/dayz-prepare-update.service /etc/systemd/system/dayz-prepare-update.timer
sudo systemctl daemon-reload
sudo systemctl enable --now dayz-prepare-update.timer
sudo systemctl list-timers dayz-prepare-update.timer --no-pager
sudo journalctl -u dayz-prepare-update.service -n 100 --no-pager

Check the journal after each scheduled run. The single pending folder prevents daily downloads from accumulating while a set awaits review. To pause future runs, use sudo systemctl disable --now dayz-prepare-update.timer; disabling the timer doesn’t stop a preparation job already running. Wait for that job to exit before moving its files, or stop dayz-prepare-update.service and treat its pending set as incomplete.

Install a prepared set during attended maintenance

Keep the existing installation until the replacement passes. Use pending/game as the stock files for a separate test installation, and copy the prepared mod folders into that installation. Preserve each package’s loading scope and collect its required signing keys as described in installing mods. Merge mission changes using the comparison procedure below, then add the intended configuration and launch arguments.

Before copying current world data, warn players through your tested announcement method, stop the existing service and confirm the process has exited. For the systemd example linked above, sudo systemctl stop dayz-server.service keeps that service stopped; it does not broadcast a warning. Verify the stopped-server backup, including external profiles, custom storage and mod-owned databases. Use separate paths for the test copy so it cannot write into the retained world’s files.

Run the join, persistence and mod checks below against the replacement. Change the service’s launch path and any path-dependent arguments only when those checks pass, then verify the installed service again before admitting players. If they fail, leave the replacement stopped and retain the failed logs and original recovery set. Review client and mod compatibility before attempting a binary rollback.

The script’s control flow, package copies and failure handling were tested locally with fake SteamCMD commands on 8 October 2026. Steam authentication, real downloads, Linux service execution and game recovery have not been tested here. Rehearse those steps on your own isolated instance before scheduling downloads or replacing a production installation.

Keep Stable and Experimental installations separate

Give a DayZ Experimental test its own installation directory and saved world. Retain the community’s Stable installation for normal operation and recovery. The Experimental server application has a different Steam ID, documented in Bohemia’s Linux hosting reference:

Server application	Steam application ID	Example installation directory
DayZ Server, Stable	223350	C:\DayZServer or /home/dayz/servers/dayz-server
DayZ Experimental Server	1042420	C:\DayZExperimentalServer or /home/dayz/servers/dayz-experimental

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For Windows, choose your SteamCMD path, a separate test directory and your Steam login name:

& 'C:\SteamCMD\steamcmd.exe' +force_install_dir 'C:\DayZExperimentalServer' +login YOUR_STEAM_LOGIN +app_update 1042420 +quit

Run the Linux installation under its service account after substituting your paths and Steam login:

/home/dayz/steamcmd/steamcmd.sh +force_install_dir /home/dayz/servers/dayz-experimental +login YOUR_STEAM_LOGIN +app_update 1042420 +quit

Check SteamCMD’s success result for application 1042420 before preparing the test service. Use separate configuration, profiles and persistence, with the mission supplied for that build and fresh storage. Services sharing a host need distinct network endpoints. Inspect each service’s launch path to confirm its executable and installation directory. Confirm VXPanel’s supported branch workflow before arranging a managed-service test.

Install and launch the Experimental client

Bohemia’s Experimental apps announcement says owning DayZ on Steam adds DayZ Experimental to your library. It is a separate client app, so you can keep ordinary DayZ installed alongside it. DayZ Experimental Server in Steam’s Tools list is the server application, not the client players launch.

1. In the Steam account that owns DayZ, search your Library for DayZ Experimental. Install that entry and let its update finish. If it is missing, check library filters and hidden entries before following older instructions that switch the ordinary game’s beta branch.
2. Start DayZ Experimental from its own library entry. Use that client’s server browser for the Experimental test; confirm the target server’s name and build with its owner.
3. Compare the complete client/server build strings if joining fails. A matching branch name alone doesn’t prove both installations finished the latest update.
4. To return to Stable, close the Experimental client and launch the ordinary DayZ library entry. Join the retained Stable server with its matching mod set. You don’t need to uninstall Experimental to switch back.

The developer’s Experimental branch guidance warns that this branch can be unstable and its characters or persistence can be wiped. Keep the test world separate from the community’s Stable saves. Installing the client also doesn’t establish that a Workshop package works on that build; check the package’s supported client-loading procedure before a modded test.

Consult the official Experimental update notes when selecting Workshop packages. The 16 September 2026 release announcement, for example, warns of possible animation-mod problems after its animation changes. Verify the package’s behavior on the test build even when installation has succeeded.

Record a vanilla Experimental join, then add the required packages and check their affected interactions. Retain the Stable packages and saved world throughout this rehearsal. To resume Stable play, use the retained Stable service and its matching client. Restore its own save; an Experimental save is not a verified Stable recovery set, and SteamCMD cannot be assumed to supply every historical build.

Update Workshop mods as a matching set

The server application update does not refresh separately installed Workshop packages. Use your mod manager or the author’s download method to update each package and its dependencies while DayZ is stopped.

For a self-managed SteamCMD installation, this example downloads Community Framework from the DayZ Workshop application, 221100:

login YOUR_STEAM_LOGIN
workshop_download_item 221100 1559212036
quit

Run these in an interactive SteamCMD session. Inspect its reported download location, then deploy the complete downloaded package to the mod directory used by your launch configuration. A Workshop download does not automatically replace a separately copied @CF folder.

Preserve mod configuration and persistence according to the author’s instructions. Review changed signing keys, keep dependencies before dependent mods, and retain the correct client/server loading scope. Follow the mod installation guide for package placement and keys.

Players must also have the matching client-required packages. Compare the server’s deployed version with the client’s installed version when a join reports a missing PBO, signature error or mod mismatch. A Workshop subscription on the administrator’s PC does not prove that the host’s copy was updated.

Preserve economy edits when mission files change

Keep three copies for comparison: the previous stock mission, your edited mission and the new stock mission. Apply intentional local changes to the new baseline. Restoring an entire old types.xml over a new release can discard newly added items and other game changes.

For future maintenance, keep supported Central Economy changes in separate registered XML files. The loot override tutorial shows a complete example. After an update, retain those files and check that the new cfgeconomycore.xml still registers them.

Scalespeeder demonstrates this maintenance approach in a video published on 19 February 2026. Separate overrides reduce repeated editing, but still need review when classnames, merge rules or the mod’s configuration change. Bohemia’s mission-file modding reference defines the supported registration types. This mechanism does not register arbitrary JSON files.

Use the documented registration type spawnabletypes for a cfgspawnabletypes.xml override. Its attachment and cargo lists replace the original lists; they do not append missing entries from the new stock file. Message overrides append messages instead of replacing the originals. Review those merge rules before carrying an override into a new release.

Get fresh mission files and compare the changes

Take the new stock mission from mpmissions/<mission> in a separate, clean server installation matching your intended branch and build. Record that build with the copy. Keep it outside the running server’s directories; validating your edited installation just to recover defaults can overwrite the edits you’re trying to preserve.

Bohemia also publishes DayZ Central Economy reference missions. Select the mission and a revision appropriate to your server release, and record its commit ID. The repository’s latest files may differ from the build you installed. If you can’t establish the match, use the clean installation’s shipped mission as your comparison baseline. VXPanel’s default-file regeneration control has not been verified here.

On your own computer, put the previous stock configuration in old-stock, your pre-update configuration in edited, and the new stock configuration in new-stock. Retain the same subfolders within each. Keep these comparison copies limited to configuration; preserve world storage and profiles in the separate backup.

With Git installed, open a terminal in their parent directory. These read-only comparisons show your old customizations first, then the game’s changes:

git --no-pager diff --no-index --no-ext-diff --no-textconv -- old-stock/db/types.xml edited/db/types.xml
git --no-pager diff --no-index --no-ext-diff --no-textconv -- old-stock/db/types.xml new-stock/db/types.xml

Git’s --no-index mode compares files without creating a repository. Exit code 1 means it found differences; 0 means the files match. Other failures need investigation. The commands don’t merge or overwrite either file. Quote any replacement path containing spaces. Repeat the comparison for the other mission files you changed, including registrations and scripts where applicable.

Work in a fourth copy made from new-stock. Reapply your intended customizations there, reviewing each against the new defaults. For example, retain newly supplied item entries while changing your chosen item’s nominal; copying the entire old types.xml back can discard the new entries. If both you and the game changed the same setting, decide its value explicitly. Keep custom override registrations and files together and apply the merge rules above.

Parse the resulting XML, inspect the diff once more and test the merged mission on a separate instance before replacing the live configuration. Follow the join and persistence checks below. Retain all three comparison copies and the stopped-server backup until the update has passed; a successful text merge alone doesn’t prove that DayZ loads the mission.

Verify the update before reopening

1. Start the server and read the new startup logs. Confirm the build, loaded mission and required packages; resolve XML or script errors first.
2. Join from an updated client using the assigned address and game port. Confirm your character and an existing persistent object where practical.
3. Test the systems affected by the update: admin access, modded interactions, trader data or natural loot spawns as applicable.
4. Check launcher visibility separately from a successful direct join.
5. Record the installed versions and observed result, then restore the intended restart schedule and let players back in.

For server version doesn’t match local version, check branch and game build on both sides. For a mod-specific error, check the deployed package and dependency versions before changing unrelated server settings.

Recover from a failed update

Keep the server stopped if it starts with unexpected world data or repeated errors. Save the failed startup logs and compare the changed files with your recovery copy.

Restore only the configuration or data needed for the diagnosed failure. A binary rollback also needs compatible game clients and mods; SteamCMD normally updates to the available branch, and a world written by a newer build may not be safe to open with an older one. Do not assume that downloading the current branch recreates a previous release.

If you need to restore the world, use a consistent recovery set and the restore procedure. Keep the failed state for diagnosis before replacing it.

Before maintenance, use the DayZ backup and restore guide to inventory persistence and mod-owned data and rehearse recovery.

Source and verification scope

This guide used AI-assisted research and drafting. On 3 October 2026, we reviewed the documented server application IDs, command structure and official release guidance. Command inspection did not download or start either server application. Check that your account can access the Experimental client, then test joins and mod compatibility on your installation.

The client steps were added on 8 October after checking Bohemia’s separate-app and Experimental-branch instructions. No Steam client, download or game join was run. The installed launcher UI and loading Workshop packages into the Experimental client remain unverified here.