Permission to var/cache

find . -type f -exec chmod 644 {} \;
find . -type d -exec chmod 755 {} \;
find var pub/static pub/media app/etc generated/ -type f -exec chmod g+w {} \;
find var pub/static pub/media app/etc generated/ -type d -exec chmod g+ws {} \;
chown -R <Magento user>:<web server group> .
chmod u+x bin/magento

Source: magento.stackexchange.com

Permission to var/cache

sudo chmod -R 777 var/;sudo chmod -R 777 pub/;sudo chmod -R 777 generated/;

Source: magento.stackexchange.com

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