Running your app with Docker, AWS Lambda (Bref) or Google Cloud functions, you need to know how to configure Symfony with a read-only filesystem. We also need to explain "almost read-only filesystems"

Example:

• How to warmup the cache,
• Configure logs
• Sessions needs to be stored elsewhere,
• Use APC or redis more
• Use Flysystem for uploads etc

For "almost read-only filesystem" we need to show:

• How to move the cache/log directory in production
• How to use the build directory