Troubleshoot cron

If the cron readiness check fails, first determine whether a cron job is set up or not.

The following messages display in the Component Manager if no cron job is set up:

Another symptom that cron isn鈥檛 running is that the PHP readiness check doesn鈥檛 display the PHP version as the following figure shows.

Check your existing crontab

To verify whether or not your crontab is set up:

Log in to your Magento server.
As a user with root privileges, see if a crontab is already set up.
```
crontab -u <Magento file system owner name> -l
```
For example, on CentOS
```
crontab -u magento_user -l
```
If no crontab has been set up for the user, the following message displays:
```
no crontab for magento_user
```
See one of the following sections for a solution to your issue.

Solution: crontab not set up

To verify your cron jobs are set up properly, see Set up cron jobs.

Solution: cron running with errors

Try running each command manually because the command might display helpful error messages.

Run the setup application cron job

See Configure and run cron.

You must run cron at least twice for the job to execute.

Run the updater cron job

Change to the <your Magento install dir>/update directory.

Enter the following command:

php cron.php

Errors similar to the following indicate you have not yet run composer install to update dependencies for the updater application:

PHP Warning:  require_once(/var/www/html/magento2/update/vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/magento2/update/app/bootstrap.php on line 13
PHP Fatal error:  require_once(): Failed opening required '/var/www/html/magento2/update/vendor/autoload.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/magento2ce/update/app/bootstrap.php on line 13

If that鈥檚 the case, see Update installer dependencies.

Troubleshoot cron