Docker: in memory file system

There’s no difference between the storage of the image and the base filesystem of the container, the layered FS accesses the images layers directly as a RO layer, with the container using a RW layer above to catch any changes. Therefore your goal of having the container running in memory while the Docker installation remains … Read more

Unsuccessful: alter table XXX drop constraint YYY in Hibernate/JPA/HSQLDB standalone

You can ignore these errors. Combination of create-drop and empty (which is the case always for in-memory) database produces these for every database object it tries to drop. Reason being that there is not any database objects to remove – DROP statements are executed against empty database. Also with normal permanent database such a errors … Read more

How to create an in-memory object that can be used as a Reader, Writer, or Seek in Rust?

In fact there is a way: Cursor<T>! (please also read Shepmaster’s answer on why often it’s even easier) In the documentation you can see that there are the following impls: impl<T> Seek for Cursor<T> where T: AsRef<[u8]> impl<T> Read for Cursor<T> where T: AsRef<[u8]> impl Write for Cursor<Vec<u8>> impl<T> AsRef<[T]> for Vec<T> From this you … Read more