How to run crontab for Magento upgrade

I have Magento 2.0.7 and i want to upgrade to 2.1.5 which is the latest version of Magento but I’m having a problem with crontab when i try to upgrade the system and I do Readiness check it gives me a problem :

Example link

I tried this tutorial:

and i used these lines:

* * * * * /usr/bin/php /var/www/magento/bin/magento cron:run | grep -v "Ran jobs by schedule" >> /var/www/magento/var/log/magento.cron.log
* * * * * /usr/bin/php /var/www/magento/update/cron.php >> /var/www/magento/var/log/update.cron.log
* * * * * /usr/bin/php /var/www/magento/bin/magento setup:cron:run >> /var/www/magento/var/log/setup.cron.log```  

but it's not working

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Good afternoon, I wanted to know if you had already solved the problem that you had with magento 2.0.7 and the upgrade, I also have the same problem. I would like to know if anyone can help us in this session or if we can make another decision about it.

I know Linux basics but the problem i couldn’t find a suitable tutorial on how to do it with clear examples


cat: /var/log/syslog: Permission denied
# daemon's notion of time and timezones.
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
# For more information see the manual pages of crontab(5) and cron(8)
# m h  dom mon dow   command

* * * * * /usr/bin/php /var/www/html/magento/bin/magento cron:run | grep -v "Ran jobs by schedule" >> /var/www/html/magento/var/log/mage$
* * * * * /usr/bin/php /var/www/html/magento/update/cron.php >> /var/www/html/magento/var/log/update.cron.log
* * * * * /usr/bin/php /var/www/html/magento/bin/magento setup:cron:run >> /var/www/html/magento/var/log/setup.cron.log

this is the content of crontab