Dedicated server

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Revision as of 00:41, 22 September 2019 by Invicta nz (talk | contribs) (Server segfaults on round end/map change)

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Setting up a dedicated server

There are no Windows binaries, this guide is exclusively for Ubuntu Linux.

This guide assumes you know the basics of using a bash terminal: ssh'ing into a server, running bash commands, editing text files, etc.

If you have no experience using bash, maybe start [here][1]

Minimum Specs

2.8Ghz CPU for a 10 player server
4.2Ghz i7 CPU for a 50 player server

File Tree



Install dependencies and create the `steam` user. (You only need to do this once):

sudo apt update && sudo apt install -y gdb curl lib32gcc1  && sudo useradd -m steam

Login as the steam user. (You will need to do this each time you connect to your server):

sudo su -l steam -s /bin/bash

Install Steam:

mkdir ~/Steam && cd ~/Steam && curl -sqL "" | tar zxvf -

Install the Pavlov Server (You will need to to do this each time there is a Pavlov Server update):

cd ~/Steam && ./ +login anonymous +force_install_dir /home/steam/pavlovserver +app_update 622970 +exit

Make the PavlovServer script executable. (You only need to do this once):

chmod +x ~/pavlovserver/

Server Configuration

Before starting the server we need to configure it, create a file at /home/steam/pavlovserver/Pavlov/Saved/Config/LinuxServer/Game.ini and open it with your preferred text editor, Vim in this case.

mkdir -p /home/steam/pavlovserver/Pavlov/Saved/Config/LinuxServer
vim /home/steam/pavlovserver/Pavlov/Saved/Config/LinuxServer/Game.ini

Below is an example of a server config file.

ServerName="My dedicated server"
MapRotation=(MapId="datacenter", GameMode="SND")
MapRotation=(MapId="sand", GameMode="DM")
MapRotation=(MapId="bridge", GameMode="TDM")
  • bEnabled - whether the server appears in the server list (unconfirmed)
  • ServerName - name it will be listed as. (approx 35 chars max)
  • MaxPlayers - See suggested specs for limits
  • bSecured - enabled Valve Anti-Cheat (VAC)
  • MapRotation - you can add multiple of these. The MapId must be “UGC” followed by the map ID. you can find the map id in the URL of the steam workshop page.

Available game modes as of 10th of May 2019: SND, TDM, DM, GUN.

Maps running a Custom Game Mode (TTT, BR, Duel, etc.) don't care which GameMode you chose.

Admin/Moderator list

(optional) If you add moderators to your server, they will have an "admin panel" in their menu which will allow them to:

  • kill player
  • teleport to player
  • kick player
  • ban player
  • rotate to next map
vim ~/pavlovserver/Pavlov/Saved/Config/mods.txt

Example Mod List:

90000000000000111 # Some Player
90000000000000112 # Some Other Player

Steam ID finder:

Firewall Rules

Inbound IP Range:

Inbound Ports:

  • 7 - UDP - ICMP - used for pinging
  • 7000 - UDP
  • 7200 - UDP
  • 7777 - UDP

An easy method of creating firewall rules in Linux is by using a third-party firewall tool. We will be using "ufw".

First, install ufw with the following command.

sudo apt install ufw -y

After installation, the most important step of all is to allow SSH (remote connections). This can be enabled with

sudo ufw allow ssh

If you do not enable SSH connections, you will not be able to remotely connect to your machine, essentially bricking it.

Next, we need to allow connections from all of Pavlov's UDP ports. This can be done with

sudo ufw allow 7/udp && sudo ufw allow 7000/udp && sudo ufw allow 7200/udp && sudo ufw allow 7777/udp

The only remaining step is to enable UFW's firewall with

sudo ufw enable

Starting the server

cd ~/pavlovserver && ./

That's it, your server will be automatically broadcast to the master server! :)

Note that when you close your terminal, the server will go down. See the "supervisors" section below for how to prevent this.

Hosting Providers

Considering the suggested server specs, you may be interested in the following hosting providers:

Provider              | Base CPU | Details
OVH                   | 4.5 GHz  |
Amazon Web Services   | 4.0 Ghz  |            | 3.5 GHz  |
Google Cloud Platform | 2.6 GHz  |

Amazon Web Services

Login -> Change Region: Choose your region
Services -> Compute -> EC2 -> Create
Choose an AMI: Ubuntu 18.04
Instance Type: z1d.large

Instance Details -> Tenancy: Dedicated (optional: this will more than triple the cost)

Storage: 50gb disk (or whatever, you're in control of the map roster)

Security Groups:
Create a new Security Group
Security group name: pavlov-server
Description: pavlov server
Type: Custom ICMP Rule - IPV4 / Protocol: Echo Request
Type: Custom UDP Rule / Port Range: 7000 / Source:
Type: Custom UDP Rule / Port Range: 7200 / Source:
Type: Custom UDP Rule / Port Range: 7777 / Source:
Type: SSH (optional, but I assume you wanna SSH in..)

Launch -> Create new Keypair -> Download -> Launch

Once it's started, SSH in like:
$ ssh -i your-key.pem

(I use cmder on Windows, if you're using putty or mobaxterm or something, might be different)

Google Cloud Platform

Menu -> compute engine -> VM instances
create instance
- region: wherever you like
- machine type: highcpu 4
- boot disk: Ubuntu 18.04
- boot disk -> size: 50gb
- network tags: pavlov-server
- [create]

- Menu -> Compute Engine -> Metadata -> SSH Keys
- [edit] -> [add item]
- "Enter entire key data": the syntax must be `<key> <username>`
- [save]

Menu -> Vpc network -> firewall rules
[Create firewall rule]
Name: pavlov server
Target Tags: pavlov-server
Source IP Ranges:
Protocols and Ports -> Specified protocols and ports -> UDP: 7, 7000, 7200, 7777

Advanced Server Administration

Running multiple servers on one host

  • Make multiple server installs by defining a separate install dir for each server.
  • Run each server with a unique port. eg: ./ -PORT="Desired Port"
  • Ensure the ports are forwarded and opened in your firewall

To duplicate directories:

be in the steam home folder

cp -R pavlovserver pavlovserver1

/home/steam/pavlovserver1/ -PORT=whatever

Supervising the server

Running ./ in your interactive shell is easy, but the server will shut down when you close your terminal. If you want to run the server in the background, you'll want to run it under a supervisor. There are many options, ranging from the simple (nohup, screen or tmux), to the more robust (supervisord, systemd).

Using Systemd

Systemd is running by default on Ubuntu Linux, so we'll use that here.

To run the server as a systemd service, create the file /etc/systemd/system/pavlovserver.service (as root) with the contents

Description=Pavlov VR dedicated server

# XXX the server will often crash on round end/map change with a segfault
# until dave hires more programmers, just restart the server every time

WantedBy =

Change the user or paths as appropriate. After saving the service file, to start, restart, stop, or monitor the server:

sudo systemctl start pavlovserver
sudo systemctl restart pavlovserver
sudo systemctl stop pavlovserver
sudo systemctl status pavlovserver

To view the logs:

sudo journalctl -u pavlovserver
# to live-tail the logs
sudo journalctl -u pavlovserver -f

If you want to run the pavlov server as soon as your server boots (e.g. a VPS you turn on and off), add pavlov as a startup service:

sudo systemctl enable pavlovserver

Here's some executables you can create to help, after setting these up they should be the only commands you need to run on your server. Descriptions on what they are, and how to install and use them are in the comment blocks.

#!/bin/bash -e
# Copy txt of this script to /usr/bin/pav-edit
# chmod a+x /usr/bin/pav-edit
# usage: pav-edit
# stops the server, edits the config, updates the server, starts the server, then tails the logs
# doesn't need to be run as the "steam" user
# does assume you've setup systemd as per the wiki

echo "stopping server..."
sudo service pavlovserver stop

echo "opening config..."
sudo vim /home/steam/pavlovserver/Pavlov/Saved/Config/LinuxServer/Game.ini

echo "updating server binary..."
cd /home/steam/Steam
sudo -u steam ./ +login anonymous +force_install_dir /home/steam/pavlovserver +app_update 622970 +exit

echo "starting server..."
sudo service pavlovserver start

echo "tailing logs..."

echo "pav-edit complete"
#!/bin/bash -e
# Copy txt of this script to /usr/bin/pav-logs
# chmod a+x /usr/bin/pav-logs
# usage: pav-logs
# tails the logs

tail -f -n1000 /home/steam/pavlovserver/Pavlov/Saved/Logs/Pavlov.log | grep -v 'Sending heartbeat to masterserver'


To run the server without outputting the heartbeat:

./ | sed '/heartbeat/d'

To monitor the logs (without heartbeat) from another terminal:

tail -f -n10000 /home/steam/pavlovserver/Pavlov/Saved/Logs/Pavlov.log | grep -v 'Sending heartbeat to masterserver'

Check your CPU Clock Speed with:

lscpu | grep MHz

Map wont load (kicks to datacenter)

try deleting all the downloaded workshop maps with:

sudo rm -rf /tmp/workshop/7777/content/555160/*
for all maps or
sudo rm -rf /tmp/workshop/7777/content/555160/whatever-UGC
for specific map

Server segfaults on round end/map change

If your server hangs at the end of the round and you see errors in the log similar to

Unhandled Exception: SIGSEGV: invalid attempt to read memory at address 0x000000000000390a

It's a known issue. There's no real workaround except to restart the server once it fails. The config in #Using Systemd will do this for you, or other supervisors can do the same.

If you have a map rotation, a simple workaround to the rotation starting at the first map after every round is to randomize map rotation every time the server restarts. e.g.

In before the last line that launches the server insert the following 2 lines. Note that the command is one long line... copy paste may add line break which you will need to remove


# shuffle map rotation on start to workaround crashing bug
cat "$UE4_PROJECT_ROOT/Pavlov/Saved/Config/LinuxServer/Game.ini" | awk 'NR<2{print $0;next}{print $0| "shuf"}' > $UE4_PROJECT_ROOT/Pavlov/Saved/Config/LinuxServer/Game.ini_tmp && cp $UE4_PROJECT_ROOT/Pavlov/Saved/Config/LinuxServer/Game.ini_tmp $UE4_PROJECT_ROOT/Pavlov/Saved/Config/LinuxServer/Game.ini

There's still a chance you'll get a map repeat of course, but it'll be rarer.

Getting Help

There's a #custom-servers channel on the official Pavlov Discord - Lots of helpful people there!