Create a simple dynamic config for a locally running server

traefik_dyn_install.sh

#!/bin/bash

set -e

# Set variables
TRAEFIK_DYNAMIC_DIR="/etc/traefik/dyn"

# Check if script is run as root
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 
   exit 1
fi

# Function to validate hostname
validate_hostname() {
    if [[ ! $1 =~ ^[a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?(\.[a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?)*$ ]]; then
        echo "Invalid hostname format"
        return 1
    fi
    return 0
}

# Function to validate port number
validate_port() {
    if ! [[ $1 =~ ^[0-9]+$ ]] || [ $1 -lt 1 ] || [ $1 -gt 65535 ]; then
        echo "Invalid port number. Must be between 1 and 65535."
        return 1
    fi
    return 0
}

# Prompt for hostname
while true; do
    read -p "Enter the hostname (e.g., example.com): " HOSTNAME
    if validate_hostname "$HOSTNAME"; then
        break
    fi
done

# Prompt for local port
while true; do
    read -p "Enter the local port number: " LOCAL_PORT
    if validate_port "$LOCAL_PORT"; then
        break
    fi
done

# Generate a safe filename
FILENAME=$(echo "$HOSTNAME" | sed 's/[^a-zA-Z0-9]/_/g')

# Create the dynamic configuration file
cat << EOF > "${TRAEFIK_DYNAMIC_DIR}/${FILENAME}.yml"
http:
  routers:
    ${FILENAME}:
      rule: "Host(\`${HOSTNAME}\`)"
      service: ${FILENAME}
      entryPoints:
        - websecure
      tls:
        certResolver: cloudflare

  services:
    ${FILENAME}:
      loadBalancer:
        servers:
          - url: "http://127.0.0.1:${LOCAL_PORT}"
EOF

echo "Configuration file created: ${TRAEFIK_DYNAMIC_DIR}/${FILENAME}.yml"
echo "Traefik will route traffic for ${HOSTNAME} to localhost:${LOCAL_PORT}"
echo "Make sure your DNS is configured to point ${HOSTNAME} to this server's IP address."
echo "If Traefik is running, it should automatically detect and apply this new configuration."