traefik-gen-dynconf

#!/bin/bash

# Auhtor: Julian Lamprecht
# V1.0

# Script to generate a valid dynamic yaml config for traefik

if [ $# -ne 1 ]; then
    >&2 echo "Not enough arguments"
    echo "Usage: $(basename "$0") [file]"
    echo "The file must have the followig format with one service per line. Each element must be separated by spaces"
    echo "[service name] [hostname / ip] [port] [domain]"
    exit 1
fi

SERVICES_FILE=$1
TRAEFIK_FILE=traefik.yaml


############################################################################################################################
# Read the file line by line into the arrary; One service per line
readarray -t services < $SERVICES_FILE


############################################################################################################################
# TODO: add option to enable tcp requests
# Start the file with "http" to enable http requests
echo "http:" >> $TRAEFIK_FILE


############################################################################################################################
# Generate routers for each service
echo "  routers:" >> $TRAEFIK_FILE

for service in "${services[@]}"
do
    # Split string into array, split by spaces
    IFS=" " read -ra serviceArray <<< $service
    #for x in "${serviceArray[@]}"
    #do
    #    echo $x
    #done

    {
        echo "    ${serviceArray[0]}:"
        echo "      rule: \"Host(\`${serviceArray[3]}\`)\""
        echo "      service: ${serviceArray[0]}"
    } >> $TRAEFIK_FILE
done


############################################################################################################################
# Generate each service
echo "  services:" >> $TRAEFIK_FILE

for service in "${services[@]}"
do
    # Split string into array, split by spaces
    IFS=" " read -ra serviceArray <<< $service
    #for x in "${serviceArray[@]}"
    #do
    #    echo $x
    #done

    {
        echo "    ${serviceArray[0]}:"
        echo "      loadbalancer:"
        echo "        servers:"
        echo "        - url: http://${serviceArray[1]}:${serviceArray[2]}" 
    } >> $TRAEFIK_FILE
done