XyloSiteMonitor is a single-file python script which tests every permutation of ways your website can be accessed:

• IPv4 or IPv6
• TLS or not
• www or not

Some permutations will result in a page loading. Others may result in a redirect. All permutations need testing.

Websites to be tested are defined in a beautiful YAML format.

It produces a nice report and can pass the report to a local mail-server if you want.

Here's an example:

- name: HomePage
  expected string: Joseph Graham
  canonical address: https://www.xylon.me.uk/
  urls:
  - url: www.xylon.me.uk
    tests:
    - action: return string
      protocols:
        - TLS
    - action: redirect
      protocols:
        - no-TLS
  - url: xylon.me.uk
    tests:
    - action: redirect
      protocols:
        - TLS
        - no-TLS

This translates into 8 checks and produces the following output:

_HomePage_

IPv4, does "www.xylon.me.uk" return string over "TLS"?
 Test Success!

IPv6, does "www.xylon.me.uk" return string over "TLS"?
 Test Success!

IPv4, does "www.xylon.me.uk" redirect over "no-TLS"?
 Test Success!

IPv6, does "www.xylon.me.uk" redirect over "no-TLS"?
 Test Success!

IPv4, does "xylon.me.uk" redirect over "TLS"?
 Test Success!

IPv6, does "xylon.me.uk" redirect over "TLS"?
 Test Success!

IPv4, does "xylon.me.uk" redirect over "no-TLS"?
 Test Success!

IPv6, does "xylon.me.uk" redirect over "no-TLS"?
 Test Success!

Summary:
8 tests passed
0 tests failed
0 sites re-tested

To monitor all 10 of my websites like this means 64 checks. To get this many checks with UptimeRobot would require a Pro plan and it wouldn't allow me to explicitly test IPv4 vs IPv6. Rival service Pingdom can do IPv4 or 6 but this many checks would require an "Advanced" plan for £48 GBP per month!

Dependencies are:

• python3
• python3-yaml
• python3-pycurl

To find out the options please run:

./xylositemonitor.py --help

I use it as a cron job on a dedicated monitoring server:

25 5 * * * /usr/local/bin/xylositemonitor.py --annotation 'SiteMonitor daily' --mailto joseph@xylon.me.uk
33 * * * * /usr/local/bin/xylositemonitor.py --annotation 'SiteMonitor hourly' --mailto joseph@xylon.me.uk --email-only-on-fail

This way I get an email every day, usually telling me all tests passed. And there's also an hourly check which only sends an email on error.