Script for autorenewing Let'sEncyrpt certs for an Haproxy box

le-renew-haproxy

#!/bin/bash
#
#  Let's Encrypt HAProxy script
#
###################################

DOMAINS=(
   "foo.example.com"
   "bar.example.com"
)

EMAIL="me@example.com"
WEB_ROOT="/usr/share/nginx/html/"

#When cert is down to this many days
#It is allowed to renew
EXP_LIMIT=30;

#Only reload HAProxy if a cert was created/updated
RELOAD=false

#####################################
#
# Confirm bc command is installed
#
#####################################
command -v bc >> /dev/null
if [[ $? -ne 0 ]];
then
   echo ""
   echo "========================================================"
   echo ""
   echo "Error: cmd bc is not installed "
   echo "    To install run"
   echo "    sudo apt-get install bc"
   echo "========================================================"
   echo ""
   exit 1
fi




for domain in "${DOMAINS[@]}"
do
  CERT_FILE="/etc/letsencrypt/live/$domain/fullchain.pem"
  KEY_FILE="/etc/letsencrypt/live/$domain/privkey.pem"

  ##################################
  #
  # If no ssl for domain create it
  #
  ##################################
  if [ ! -f $CERT_FILE ]; then
    echo "Creating certificate for domain $domain."
    letsencrypt certonly \
        --webroot --webroot-path $WEB_ROOT \
        --email $EMAIL \
        --agree-tos \
        -d $domain

    ###################################
    #
    # Combine certs for HAProxy and
    # Reload HAProxy
    #
    ###################################
    mkdir -p /etc/haproxy/certs/  #location to place combine cert
    RELOAD=true
    COMBINED_FILE="/etc/haproxy/certs/${domain}.pem"
    echo "Creating $COMBINED_FILE with latest certs..."
    cat /etc/letsencrypt/live/$domain/fullchain.pem \
        /etc/letsencrypt/live/$domain/privkey.pem > $COMBINED_FILE


    RELOAD=true
  else
    ##################################
    #
    # Check How long cert is valid
    #
    ##################################
    EXP=$(date -d "`openssl x509 -in $CERT_FILE -text -noout|grep "Not After"|cut -c 25-`" +%s)
    DATE_NOW=$(date -d "now" +%s)
    DAYS_EXP=$(echo \( $EXP - $DATE_NOW \) / 86400 |bc)

    if [ "$DAYS_EXP" -gt "$EXP_LIMIT" ] ; then
      echo "$domain, no need for renewal ($DAYS_EXP days left)."
    else
      #################################
      #
      # Renew Certifcate
      #
      #################################
      echo "The certificate for $domain is about to expire soon."
      echo "Starting Let's Encrypt renewal script..."
      letsencrypt certonly \
        --webroot --webroot-path $WEB_ROOT \
        --keep-until-expiring \
        --text \
        -v \
        --email $EMAIL \
        --agree-tos \
        -d $domain

      ###################################
      #
      # Combine certs for HAProxy and
      # Reload HAProxy
      #
      ###################################
      mkdir -p /etc/haproxy/certs/  #location to place combine cert
      RELOAD=true
      COMBINED_FILE="/etc/haproxy/certs/${domain}.pem"
      echo "Creating $COMBINED_FILE with latest certs..."
      cat /etc/letsencrypt/live/$domain/fullchain.pem \
          /etc/letsencrypt/live/$domain/privkey.pem > $COMBINED_FILE

      echo "Renewal process finished for domain $domain"
    fi
  fi
done

if [ "$RELOAD" = true ]
then
  echo " ========================= "
  echo " =                       = "
  echo " === Reloading HAProxy === "
  echo " =                       = "
  echo " ========================= "
  service haproxy reload
fi

I suggest you a small improvement by not keeping running Nginx service all the time, just start and stop it with this script.