HAProxy main config generator from conf.d configs

haproxy-merge-configs.sh

#!/bin/bash
#
# 1. Read and validate config files in conf.d folder: NN_configname.conf
# 2. Merge them to '.haproxy-candidate.cfg'
# 3. Validate the candidate config with haproxy
# 4. If the candidate config is valid overwrite haproxy.cfg
#
MAIN_CONFIG="/etc/haproxy/haproxy.cfg"
TEMP_CONFIG="/etc/haproxy/.haproxy-candidate.cfg"
CONFD_DIR="/etc/haproxy/conf.d"

mkdir -p ${CONFD_DIR} && chmod 0750 ${CONFD_DIR}
CONFD_CONFIG_LIST="`ls -1 ${CONFD_DIR} | grep '^[0-9]\{2\}_.*\.conf$'`"
cat << EOT > ${TEMP_CONFIG}
###
### This file is autogenerated by haproxy-merge-configs.sh
### Changes manually added to this config file will be overwritten
### To add settings use conf.d folder and NN_configname.conf
###
### Last modification: `date`
###

EOT
# Generating candidate config
for CONFIG in `echo ${CONFD_CONFIG_LIST}`; do
    echo "### BEGIN: ${CONFIG}" >> ${TEMP_CONFIG}
    cat ${CONFD_DIR}/${CONFIG} >> ${TEMP_CONFIG}
    echo "### END: ${CONFIG}" >> ${TEMP_CONFIG}
    echo -e "\n\n\n" >> ${TEMP_CONFIG}
done
# Validating candidate config
HAPROXY_VALIDATE_STDOUT="`haproxy -c -V -f ${TEMP_CONFIG}`"
if [ $? -ne 0 ]; then
    echo ${HAPROXY_VALIDATE_STDOUT}
    exit 1
else
    mv ${TEMP_CONFIG} ${MAIN_CONFIG}
fi