Monitor Website's HTML Status Code with Bash Script

DIY

For those of you who want a self built solution, follow the rest of this tutorial. For those who want to keep their sanity just use Uptime Kuma

Monitor your websites in bulk by using curl on the page and returning the status code

200 - good
302 - good redirect
500 - server side error
000 - website or DNS is down

#!/bin/bash

cd ~/html-status-codes

declare -a WEBSITES
WEBSITES+=( 
  "https://make-a-gram.williamusic.com"
  "https://www.tawtaw.site/home"
  "https://cutefruit.tawtaw.site/home" 
  "https://partyvibeonline.tawtaw.site/home"
  "http://prowlarr.lan"
  "http://dupdash.lan"
  "https://150events-ks.tawtaw.site/home"
  "https://blesspress.williamusic.com"
)

# commented code is for monitoring in a single document
# printf '%(%Y-%m-%d %H:%M:%S)T\n' -1 >> all-codes.log

for website in "${WEBSITES[@]}"
do
  # curl -o /dev/null -s -w "%{http_code} " $website >> all-codes.log
  # echo "$website" >> all-codes.log

  # remove any bad chars for filenames
  FILENAME=$(sed -E 's/(http|https):\/\///g' <<< $website | sed 's/\//_/g')
  test -e "./logs/$FILENAME.log" || touch ./logs/$FILENAME.log
  curl -o /dev/null -s -w "%{http_code}" $website > "./logs/$FILENAME.log"
done

# echo "---" >> all-codes.log

This will create a file for each website that houses the latest code returned. If you want a single file that houses the log with timestamp, uncomment out the other snippets.

Cron

Run this regularly with a crontab -e config every 15 minutes

*/15 * * * * ~/html-status-codes/html-code-monitor.sh

Home Assistant Sensor

I leverage Home Assistant as a way to track history and send alerts. Here is how to set up the sensor

sensor:
	- platform: template
	  sensors:
	    html_code_makeagram:
	      friendly_name: HTML Code Make a Gram
	      value_template: "{{ int(value,0)}}"
	      icon_template: >-
	        {% if int(value,0) == 0 %}
	          mdi:server-off
	        {% elif int(value,0) > 199 and int(value,0) < 400 %}
	          mdi:check-circle
	        {% elif int(value,0) > 499 %}
	          mdi:alert-outline
	        {% else %}
	          mdi:help-rhombus-outline
	        {% endif %}

Cron

Home Assistant Sensor

Credit