README

This script can be used for Drupal8 through Drupal11 uptime monitoring. It is not suitable for subsystem health-checks for things like container or load balancer.

Installation

Add this to your composer.json:

{
    "extra": {
        "dropin-paths": {
            "web/": [
                "type:web-dropin",
                "package:wunderio/drupal-ping:_ping.php"
            ]
        }
    }
}

Then install the composer package as usual with:

composer require wunderio/drupal-ping:^2

Add _ping.php into the main project's .gitignore.

Changelog

See Releases.

Usage

Visit /_ping.php to get a system status
By using ?debug=token additional status check table and time profiling information is displayed
- See Debug Mode how to obtain the token value
Find slow checks and checks errors in logs

Checks

Main database

User #1 record is fetched from the database.

Memcache

Assumes $settings['memcache']['servers'] presence in the settings.php.

Following statuses are issued:

disabled - No memcached servers defined in settings
success - All connections succeed
warning - At least one connection succeeds, at least one connection fails
error - All connections fail

Basic networking is used, no Memcached or Memcache class.

Redis

By using Redis class, connection is established to the server.

In settings.php following has to be defined:

$settings['redis.connection']['host']
$settings['redis.connection']['port']

This test works on both TCP and Unix Sockets. For the latter only host has to be defined as path.

Elasticsearch

In settings.php following has to be defined:

$settings['ping_elasticsearch_connections'] = [
  [
    'host' => 'hostname',
    'port' => 1234,
    'proto' => 'http', // http or https
    'severity' => 'warning', // warning or error
  ],
];

Elasticsearch check requires separate setting, because there are too many ways how Elasticsearch config can be defined in the settings.php file, depending on many factors.

The connection is establised by PHP curl, and then /_cluster/health is being visited. The check expects to get green status in the response.

Following statuses are issued:

disabled - No Elasticsearch servers defined in settings
success - All connections succeed
warning - At least one connection failed, and all failed connections have been configured with 'severity' = 'warning'
error - At least one connection failed, and at least one of the failed connections have been configured with 'severity' = 'error'

FS Scheme

Consists of 3 tests:

Check if a file can be created within the public filesystem.
Check if the test-file can be deleted from the public filesystem.
Check if there are any leftover test-files, and remove them.

Custom ping

If a site needs any custom checks, then just create _ping.custom.php. Use of $status->setName() and $status->set() to define the result. The PHP file does not need to contain functions, just plain PHP is enough. Check it out how other checks are created in the _ping.php.

Debug Mode

_ping.php can be accessed over the web. For example https://example.com/_ping.php. It can also be accessed from the shell cd /path/web ; php _ping.php. From the shell output the debug token can be attained. Then visit the ping again with https://example.com/_ping.php?debug=token.

The token is generated in one of the following ways. These methods are listed by precedance. If earlier fails (is empty), then next one is tried.

Drupal settings $settings['ping_token']
Environment variable PING_TOKEN
Md5 of the combination of environment variable values where the variable names matches regex /^(DB|ENVIRONMENT_NAME|GIT|PHP|PROJECT_NAME|S+MTP|VARNISH|WARDEN)/ - NB! This method assumes environment variable consistency between webserver and shell.
Md5 of Drupal settings $settings['hash_salt']
Md5 of the hostname

Ping Development & Testing

Setting up development environment

Clone development and testing environment

git clone git@github.com:wunderio/drupal-project.git ~/projects/drupal-ping
Yes, save it as drupal-ping.

cd drupal-ping/
Clone the ping project itself

git clone git@github.com:wunderio/drupal-ping.git
Yes, save it as drupal-ping too, inside the folder of the same name. It is the actual repo we are going to work with.
Checkout or create your development branch.

Link .lando.yml

rm -f .lando.yml - at the top-level folder, remove the Lando conf file.
ln drupal-ping/.lando.yml - link the Lando conf from the ping repo folder. Don't create this as a soft (-s) link because Lando would mount the project where the original file is. Therefore create the hard link which is indistinguishable for Lando.

Link .lando/

rm -rf .lando - at the top-level folder, remove the Lando folder.
ln -s drupal-ping/.lando - link the Lando scripts folder from the ping repo folder.

lando start
Note that the Drupal install will mess up settings.php a bit, don't commit.
https://ping.lndo.site/_ping.php
lando scan
lando test

wunderio / drupal-ping

Maintainers

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