HTTP请求头“Strict-Transport-Security”没有配置为至少“15552000”秒出于增强安全性考虑推荐按照安全提示中的说明启用HSTS

  ServerName cloud.nextcloud.com           Header always set Strict-Transport-Security "max-age=15552000; includeSubDomains"      

Redirect all unencrypted traffic to HTTPS

   ServerName cloud.nextcloud.com    Redirect permanent / https://cloud.nextcloud.com/

opache

vi /etc/php.d/opache.ini

opcache.enable=1
opcache.enable_cli=1
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=10000
opcache.memory_consumption=128
opcache.save_comments=1
opcache.revalidate_freq=1

How to fix "No apps found for your version"

nextcloud/lib/private/App/AppStore/Fetcher/Fetcher.php
                }
                $options = [
-                       'timeout' => 10,
+                       'timeout' => 300,
                ];

sudo -u nginx php occ db:convert-filecache-bigint --no-interaction