Script creates NGINX config files for proxy_pass on internal web hosts.

proxypass.sh

#!/bin/bash
###############################################################################
#
# 	Script creates NGINX config files for 
#       proxy_pass on internal web hosts
#
#	begin: 19.06.2019
#	author: Alexander Belashev aka Stigfromsouth
#	version	: 0.0.1
#
##############################################################################
#
#	How to prepare:
#       edit $NGINX_CONFDIR, $MAIN_DN, $IP_SUBNET variables
#	sudo chmod +x proxypass.sh && mv proxypass.sh /usr/bin/proxypass
#  
#	Using example:
#	sudo proxypass -n site1 -a 87 -p 3000 -c
#
##############################################################################
#
#	TODO:
#	
#
##############################################################################
#
#   Config section
#
NGINX_CONFDIR="/etc/nginx"   # NGINX config dir
MAIN_DN="example.com"        # uplevel domain name
IP_SUBNET="192.168.1"        # backend's subnet
##############################################################################

nginx_config_creator()
{
	PROJ=$1
	IP_ADDR=$2
	PORT=$3
	
	echo "server {" >> ${PROJ}.${MAIN_DN}.conf
	echo "    listen 0.0.0.0:80;" >> ${PROJ}.${MAIN_DN}.conf
	echo "    server_name ${PROJ}.${MAIN_DN}" >> ${PROJ}.${MAIN_DN}.conf
	echo "		www.${PROJ}.${MAIN_DN};" >> ${PROJ}.${MAIN_DN}.conf
	echo "    client_max_body_size 1024m;" >> ${PROJ}.${MAIN_DN}.conf
	echo "    proxy_send_timeout 12000;" >> ${PROJ}.${MAIN_DN}.conf
	echo "    proxy_read_timeout 12000;" >> ${PROJ}.${MAIN_DN}.conf
	echo " " >>${PROJ}.${MAIN_DN}.conf
	echo "    access_log  /var/log/nginx/${PROJ}.${MAIN_DN}_access.log;" >> ${PROJ}.${MAIN_DN}.conf
	echo "    error_log  /var/log/nginx/${PROJ}.${MAIN_DN}_error.log;" >> ${PROJ}.${MAIN_DN}.conf
	echo " " >>${PROJ}.${MAIN_DN}.conf
	echo "    location / {" >>${PROJ}.${MAIN_DN}.conf
	echo "        proxy_pass http://${IP_SUBNET}.${IP_ADDR}:${PORT};" >> ${PROJ}.${MAIN_DN}.conf
	echo "        include proxy_params;" >> ${PROJ}.${MAIN_DN}.conf
	echo "    }" >> ${PROJ}.${MAIN_DN}.conf
	echo "}" >> ${PROJ}.${MAIN_DN}.conf
}

help () {
    cat <<EOF
        -h -- display its help & exit
        -n -- 3rd part domain name (project name)
        -a -- last part of IP address 192.168.1.x
        	  for destination host for proxy_pass
        -p -- destination port number
        -c -- commit action
        
        Example:
        sudo proxypass -n site1 -a 87 -p 3000 -c    
EOF
}

commit () {
	cd ${NGINX_CONFDIR}/sites-available &&
	nginx_config_creator ${PROJ} ${IP_ADDR} ${PORT} &&
	ln -s ${NGINX_CONFDIR}/sites-available/${PROJ}.${MAIN_DN}.conf ${NGINX_CONFDIR}/sites-enabled/${PROJ}.${MAIN_DN}.conf &&
	service nginx reload # need to change this line for your init system
}

# __main__
OPTS=`getopt -o hcp:n:a: -- "$@"`
if [ $? != 0 ]
then
    exit 1
fi

eval set -- "$OPTS"

while true ; do
    case "$1" in
        -h ) help; exit 0; shift ;;
        -n ) PROJ=$2; shift 2 ;;
        -a ) IP_ADDR=$2; shift 2 ;;
        -p ) PORT=$2; shift 2 ;;
        -c ) commit; shift ;;
        -- ) shift; break ;;
        * ) break ;;
    esac
done