The magento2 cache file is the root user group, not nginx
I executed the following command:
#user：ben
sudo chown -R magento:nginx /home/Production/abccom/public_html
# user: magento
find var generated vendor pub/static pub/media app/etc -type f -exec chmod g+w {} +
find var generated vendor pub/static pub/media app/etc -type d -exec chmod g+ws {} +
chown -R :nginx .
chmod u+x bin/magento
but : var/cache/mage-tags/xxxxx
rw-rw-r-- 1 nginx nginx 38457 Jan 5 04:36 mage---3a8_MAGE
-rw-rw-r-- 1 root root 16828 Jan 5 04:15 mage---3a8_REFLECTION
-rw-rw-r-- 1 nginx nginx 1108 Jan 5 04:29 mage---3a8_STORE
-rw-rw-r-- 1 nginx nginx 371 Jan 5 04:29 mage---3a8_STORE_RELATIONS
-rw-rw-r-- 1 nginx nginx 1120 Jan 5 04:35 mage---3a8_TRANSLATE
-rw-rw-r-- 1 nginx nginx 20 Jan 5 04:28 mage---3a8_USER_ASSIGNED_RO
-rw-rw-r-- 1 root root 42 Jan 5 04:14 mage---3a8_WEBSERVICE
somes file user and grouo is root ，The file does not have full write permission
How to solve it
