Almost everything my company does is in containers. Our DB is a distributed column store called Vertica. It has not been designed as a single machine DB though Microfocus staff have some great laptop demonstrations.
Our DBAs started by working out how to get a Hashicorp Vagrant instance running. Eventually we progressed to using a set of Docker containers. We are looking at Postgres in containers for some applications and microservices because the use case favours the flexibility of Postgres as an RDBMS.
The struggle is always balancing the freedom that microservice architecture brings with the data sharing needs of the organisation