How to Monitor php artisan cache:clear Cron Job Failures

php artisan cache:clear looks simple until cron makes it fail in production. The job can succeed locally, then miss a run, exit non-zero, or clear the wrong cache store once it is scheduled on the real server.

If you’re searching for how to monitor php artisan cache:clear cron job failures, the real goal is to know when the job misses a scheduled run, fails loudly, or silently stops firing at all.

The dangerous part is that the command touches the cache driver, filesystem permissions, scheduler, deploy user, and sometimes Redis itself.

How cache:clear actually works

php artisan cache:clear flushes the default cache store configured in config/cache.php:

php artisan cache:clear

If your application uses Redis, Laravel sends a flush command for the configured cache connection. If you use the file driver, Laravel deletes files under storage/framework/cache/data. If you use Memcached, DynamoDB, or a custom store, the command goes through that driver instead.

That means the command can pass locally and fail in production for reasons that have nothing to do with Laravel code. The production cron user may not have the same .env values as the web user. Redis may require TLS or a password. The file cache directory may be owned by www-data while cron runs as deploy.

Common failure modes

Wrong PHP or Artisan path. Cron often runs with a smaller PATH than your shell. php artisan cache:clear may work over SSH but fail from cron because php points to the wrong version or because cron starts in / instead of the project directory.

Cache store unavailable. If Redis is restarting, the command exits with a connection error. If your cron wrapper discards stderr, the failure becomes invisible.

Permission errors on file cache. The file cache driver needs access to storage/framework/cache. A deploy that changes ownership can make cache:clear fail even though the app still serves requests.

Clearing the wrong environment. A cron entry that does not load the right .env file can clear the local or staging cache while production keeps serving stale values.

Building visibility into cache:clear

Wrap the command so you capture the exit code, output, and runtime:

#!/usr/bin/env bash
cd /var/www/app || exit 1
START=$(date +%s)

php artisan cache:clear 2>&1
STATUS=$?
DURATION=$(( $(date +%s) - START ))

if [ "$STATUS" -eq 0 ]; then
  curl -fsS "https://crontinel.example/ping/cache-clear/success?duration=${DURATION}"
else
  curl -fsS "https://crontinel.example/ping/cache-clear/fail?status=${STATUS}"
  exit "$STATUS"
fi

For Laravel Scheduler, keep the command in routes/console.php and add a success hook:

use Illuminate\Support\Facades\Schedule;
use Illuminate\Support\Facades\Http;

Schedule::command('cache:clear')
    ->dailyAt('03:10')
    ->onSuccess(fn () => Http::get(config('services.crontinel.cache_clear')))
    ->onFailure(fn () => Http::get(config('services.crontinel.cache_clear_failed')));

The important part is not the ping itself. It is the absence of a ping. If the job never starts, exits early, or hangs before reaching onSuccess, Crontinel can alert because the expected heartbeat did not arrive.

Detecting when cache:clear fails

Monitor both outcomes: failure pings and missed success pings. A failure ping catches non-zero exits. A missed heartbeat catches the worse cases, like cron not running, the scheduler being disabled, or a deploy replacing the crontab.

Also log the cache driver and environment at runtime:

logger()->info('cache clear monitor', [
    'store' => config('cache.default'),
    'env' => app()->environment(),
    'server' => gethostname(),
]);

That one log line makes it much easier to tell whether the job cleared the right cache on the right server.

Quick setup with Crontinel

Create a Crontinel monitor for the expected schedule, then ping it only after cache:clear succeeds. Set the grace period a little longer than the slowest normal run. If the command usually finishes in 5 seconds, a 5 minute grace period is enough.

Use separate monitors for deploy-time cache clears and scheduled maintenance cache clears. They fail for different reasons, and you will want different alert messages when one goes quiet.