What is Anonymous volume in docker?

What is Anonymous volume in docker?

Anonymous volumes are not given an explicit name when they are first mounted into a container, so Docker gives them a random name that is guaranteed to be unique within a given Docker host. Besides the name, named and anonymous volumes behave in the same ways.

Does docker-compose automatically create volumes?

When you ran the container with docker run , the named volume was created automatically. However, that doesn’t happen when running with Compose. You need to define the volume in the top-level volumes: section and then specify the mountpoint in the service config.

What are the two types of docker volumes?

Docker volumes are used to persist data from within a Docker container. There are a few different types of Docker volumes: host, anonymous, and, named. Knowing what the difference is and when to use each type can be difficult, but hopefully, I can ease that pain here.

What is difference between and mount in Docker?

The biggest difference is that the -v syntax combines all the options together in one field, while the –mount syntax separates them. The second field is the path where the file or directory is mounted in the container. The third field is optional, and is a comma-separated list of options, such as ro , z , and Z .

Why are anonymous volumes created when ` docker-compose up’?

Research indicated that the anonymous volumes were created by influxdb and grafana/grafana. Anonymous volumes are not given an explicit name when they are first mounted into a container, so Docker gives them a random name that is guaranteed to be unique within a given Docker host.

What happens when you run Docker Compose up-D?

When the command exits, all containers are stopped. Running docker-compose up -d starts the containers in the background and leaves them running.

How to create a volume in a docker container?

The command simply needs one param; a path to a folder, relative to WORKDIR if set, from within the container. Then docker will create a volume in its graph (/var/lib/docker) and mount it to the folder in the container. Now the container will have somewhere to write to with high performance.

What happens when the image of a docker container is changed?

If there are existing containers for a service, and the service’s configuration or image was changed after the container’s creation, docker-compose up picks up the changes by stopping and recreating the containers (preserving mounted volumes). To prevent Compose from picking up changes, use the –no-recreate flag.