These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.
On Ubuntu 16.04 you have to install php7.0-opcache by running sudo apt install php7.0-opcache.
You might want to change some settings depending on what you need, check http://php.net/manual/de/opcache.configuration.php for config options.
The developer cloud
Scale up as you grow — whether you're running one virtual machine or ten thousand.
From GPU-powered inference and Kubernetes to managed databases and storage, get everything you need to build, scale, and deploy intelligent applications.