Fatal error while having multiple IP addresses through one network adapter

[Rajdave69]

Description of the problem

If you have multiple IP addresses set up on a single network adapter (enp0s3 for example) it causes the DomServer Container to crash with this:

domserver  | [..] Running start script 10-timezone.sh
domserver  | 
domserver  | Current default time zone: 'Asia/Riyadh'
domserver  | Local time is now:      Tue Apr 15 17:59:03 +03 2025.
domserver  | Universal Time is now:  Tue Apr 15 14:59:03 UTC 2025.
domserver  | 
domserver  | [ok] Container timezone set to: Asia/Riyadh
domserver  | 
domserver  | [..] Running start script 50-domjudge.sh
domserver  | [..] Generating credential files
domserver  | Password file 'dbpasswords.secret' already exists, leaving untouched.
domserver  | Running 'genrestapicredentials'... file 'restapi.secret' created.
domserver  | Running 'gensymfonysecret'... file 'symfony_app.secret' created.
domserver  | Running 'genadminpassword'... file 'initial_admin_password.secret' created.
domserver  | Fix WEBAPP_BASEURL  -> /
domserver  | [ok] Generated credential files
domserver  | 
domserver  | [..] Checking database connection
domserver  |   Database not installed; installing...
domserver  | Using install...
domserver  | Database credentials read from '/opt/domjudge/domserver/etc/dbpasswords.secret'.
domserver  | DOMjudge database and user(s) created.
domserver  | PHP Fatal error:  Uncaught Symfony\Component\Dotenv\Exception\FormatException: Invalid character in variable name in ".env" at line 2.
domserver  | ...D_PROXIES=10.11.0.1\n192.168.100.1\n...
domserver  |                        ^ line 2 offset 26 in /opt/domjudge/domserver/lib/vendor/symfony/dotenv/Dotenv.php:546
domserver  | Stack trace:
domserver  | #0 /opt/domjudge/domserver/lib/vendor/symfony/dotenv/Dotenv.php(271): Symfony\Component\Dotenv\Dotenv->createFormatException()
domserver  | DOMjudge/domjudge#1 /opt/domjudge/domserver/lib/vendor/symfony/dotenv/Dotenv.php(244): Symfony\Component\Dotenv\Dotenv->lexVarname()
domserver  | DOMjudge/domjudge#2 /opt/domjudge/domserver/webapp/config/load_db_secrets.php(18): Symfony\Component\Dotenv\Dotenv->parse()
domserver  | DOMjudge/domjudge#3 /opt/domjudge/domserver/webapp/config/load_db_secrets.php(55): get_db_url()
domserver  | DOMjudge/domjudge#4 /opt/domjudge/domserver/webapp/bin/console(12): require_once('...')
domserver  | DOMjudge/domjudge#5 /opt/domjudge/domserver/lib/vendor/autoload_runtime.php(9): require('...')
domserver  | DOMjudge/domjudge#6 /opt/domjudge/domserver/webapp/bin/console(11): require_once('...')
domserver  | DOMjudge/domjudge#7 {main}
domserver  |   thrown in /opt/domjudge/domserver/lib/vendor/symfony/dotenv/Dotenv.php on line 546
domserver  | [!!] Start script 50-domjudge.sh failed
domserver exited with code 1

Note that 10.11.0.1 and 192.168.100.1 are the default gateways here

Your environment

Docker config:

services:
  domserver:
    image: domjudge/domserver:latest
    container_name: domserver
    restart: unless-stopped
    network_mode: "host"
    environment:
      CONTAINER_TIMEZONE: Asia/Riyadh
      MYSQL_HOST: 127.0.0.1
      MYSQL_USER: domjudge
      MYSQL_DATABASE: domjudge
      MYSQL_PASSWORD: "$DOMJUDGE_MYSQL_PASSWORD"
      MYSQL_ROOT_PASSWORD: "$ROOT_MYSQL_PASSWORD"
    stdin_open: true
    tty: true
    volumes:
      - /sys/fs/cgroup:/sys/fs/cgroup
EOF

Steps to reproduce

Here are my exact steps of installation and setup on a fresh Ubuntu VM:

Note that the device currently already has an IP: 192.168.100.129 assigned via DHCP

sudo su

nano /etc/netplan/00-installer-config.yaml

put the following in

network:
  version: 2
  ethernets:
    enp0s3:  # replace with your interface name
      dhcp4: no
      addresses:
        - 10.11.80.201/8  # your desired static IP
      gateway4: 10.11.0.1  # your gateway
      nameservers:
        addresses:
          - 1.1.1.1
          - 8.8.8.8

run:

netplan apply

# Configure static hostname resolution
# Enter the local IPs of the servers
tee -a /etc/hosts > /dev/null <<EOF

# Custom static hostname resolution
10.11.80.201 main.domserver.local
10.11.80.202 fallback.domserver.local
EOF

# Set persistent variables (!!! DO NOT MODIFY IPs !!!)
# Check network interface with `ip -brief address show`
tee -a /etc/environment > /dev/null <<EOF
ROOT_MYSQL_PASSWORD=""
DOMJUDGE_MYSQL_PASSWORD=""
REPL_PASS="DWtScwOpHfBZ"
SERVER_1_IP="main.domserver.local"
SERVER_2_IP="fallback.domserver.local"
virtual_ip='10.11.80.200/8'
keepalived_pass=''
network_interface='enp0s3'
EOF

# Log out and re-login as root user to set the persistent variables
exit

# Enter root user terminal
sudo su

# Update packages
apt update && apt upgrade -y

# Install Docker
curl -sSL https://get.docker.com/ | CHANNEL=stable bash
systemctl enable --now docker

# Install MariaDB
apt install mariadb-server -y

# Install keepalived
apt install keepalived -y

# Install required package
apt install cifs-utils -y

# Install samba
apt install samba -y

# Edit `/etc/mysql/mariadb.conf.d/50-server.cnf` and change `bind-address` to `0.0.0.0`
sed -i 's/^bind-address\s*=.*/bind-address = 0.0.0.0/' /etc/mysql/mariadb.conf.d/50-server.cnf

# First, add the configuration without applying it yet
tee -a /etc/mysql/mariadb.conf.d/60-domjudge.cnf > /dev/null <<EOF
[mysqld]
max_connections = 1000
max_allowed_packet = 100M
EOF

systemctl stop mariadb

# Move to MariaDB data directory
cd /var/lib/mysql

# Backup the old log files (just in case)
mkdir -p /tmp/mysql_log_backup
cp ib_logfile* ibdata1 /tmp/mysql_log_backup/

# Now remove the old log files
rm -f ib_logfile* ibdata1

# Add the innodb_log_file_size setting now
echo "innodb_log_file_size = 512M" >> /etc/mysql/mariadb.conf.d/60-domjudge.cnf

systemctl start mariadb
ufw allow 3306/tcp

# Secure the MariaDB installation
mysql --user=root <<EOF
ALTER USER 'root'@'localhost' IDENTIFIED BY "${ROOT_MYSQL_PASSWORD}";
DELETE FROM mysql.user WHERE User='';
DELETE FROM mysql.user WHERE User='root' AND Host NOT IN ('localhost', '127.0.0.1', '::1');
DROP DATABASE IF EXISTS test;
DELETE FROM mysql.db WHERE Db='test' OR Db='test\_%';
FLUSH PRIVILEGES;
EOF

# Logging into MariaDB, and creating the user for domjudge
mysql -u root -p${ROOT_MYSQL_PASSWORD} -e "
CREATE USER 'domjudge'@'%' IDENTIFIED BY '${DOMJUDGE_MYSQL_PASSWORD}';
GRANT ALL PRIVILEGES ON domjudge.* TO 'domjudge'@'%';
FLUSH PRIVILEGES;"

# Logging into MariaDB, and creating the user for replication
mysql -u root mysql -u root -p${ROOT_MYSQL_PASSWORD} -e "
CREATE USER 'replicator'@'%' IDENTIFIED BY '$REPL_PASS'; 
GRANT REPLICATION SLAVE ON *.* TO 'replicator'@'%';
FLUSH PRIVILEGES;"

# Create docker container
cd /
mkdir docker-containers
cd docker-containers

# Creating a file `docker-compose.yml` with the Docker Compose
cat >> docker-compose.yml <<EOF
services:
  domserver:
    image: domjudge/domserver:latest
    container_name: domserver
    restart: unless-stopped
    network_mode: "host"
    environment:
      CONTAINER_TIMEZONE: Asia/Riyadh
      MYSQL_HOST: 127.0.0.1
      MYSQL_USER: domjudge
      MYSQL_DATABASE: domjudge
      MYSQL_PASSWORD: "$DOMJUDGE_MYSQL_PASSWORD"
      MYSQL_ROOT_PASSWORD: "$ROOT_MYSQL_PASSWORD"
    stdin_open: true
    tty: true
    volumes:
      - /sys/fs/cgroup:/sys/fs/cgroup
EOF


# Creating the required database
mysql -u root -p${ROOT_MYSQL_PASSWORD} -e "CREATE DATABASE domjudge;"

docker compose up -d

It errors out as soon as I start the container and shows this error.

Expected behaviour

For the generated trusted proxies to be formatted maybe like "192.168.100.1, 10.11.0.1" instead of having \n

Actual behaviour

domserver  | PHP Fatal error:  Uncaught Symfony\Component\Dotenv\Exception\FormatException: Invalid character in variable name in ".env" at line 2.
domserver  | ...D_PROXIES=10.11.0.1\n192.168.100.1\n...
domserver  |                        ^ line 2 offset 26 in /opt/domjudge/domserver/lib/vendor/symfony/dotenv/Dotenv.php:546

The formatting seems to be incorrect.

Undoing the IP address setup part seems to fix it

Any other information that you want to share?

[Kevinjil]

Could you elaborate on why you are running your container in host network mode? The startup script assumes you are using a docker network and trusts the docker gateway IP.

[Rajdave69]

I need to use the host network mode since my instance of mariadb is installed on the Ubuntu Server OS itself, it isn't a Docker container.

I can't use a docker container for mariadb since I've set up master-master replication on it.