How to update a file in Docker?

Question

System administration

Imported a third-party application via docker (one C1 container). If you change the files and restart (docker restart), then the changes take effect. But then I attached a mysql container to this container, and a new C2 container was formed, which includes the main C1 container and is linked to the mysql container. But that new C2 container does not have the changes that were made to the C1 container that were visible after docker restart. How to add them to the docker build?

Answer 1

docker commit?