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Currently we have to clear it manually everyday logging in to admin console and browsing to Home->Administration->Configuration->Development->Performance

Is there way we can automate this job in Drupal 8. We tried with "cron", but that didn't help.

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    "We tried with "cron", but that didn't help." - you're certain you had a cronjob for drush cr? – Kevin Nov 14 '18 at 20:47
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    What did you try with cron that didn't work? – rooby Nov 14 '18 at 20:53
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    crontab -e and then maybe 0 0 * * * cd /var/www/drupal && drush cr? – leymannx Nov 14 '18 at 20:57
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Despite you saying it didn't work with cron, I would suggest using cron in some way. :)

The CacheFlush module claims to allow configuration of this via its UI (although I haven't used it so cannot personally vouch for it).

If you are implementing custom code, drupal_flush_all_caches() will handle the flushing for you.

The Rules module also allows acting on Cron runs. Using rules you could either write a custom action that uses drupal_flush_all_caches() or find a module that provides one (I haven't seen any for D8 but that doesn't necessarily mean one doesn't exist).

You could also potentially do it outside of Drupal, using a cron job on your server to call drush cr for your site.

Aside: I would suggest also considering why you need to do this and what alternatives there are. I can't really think of many (any?) cases where I would want to do this instead of just invalidating the cache of specific content entities/pages as they are changed.

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