Since extend has been removed in version 3 there’s a new way of overriding settings by providing multiple -f params where the next file extends the previous config The docs are mixed between versions https://docs.docker.com/compose/extends/#multiple-compose-files i.e. to run in development mode docker-compose -f docker-compose.yml -f docker-compose.dev.yml Where docker-compose.yml contains the full config and docker-compose.dev.yml only … Read more
In my case this was happening because I missed adding a : after the volume name. Instead of: volumes: – mysqldata: I had typed: volumes: – mysqldata docker-compose up gave me the same error as above.
When bind mounts are files coming from your host machine, volumes are something more like the nas of docker. Bind mounts are files mounted from your host machine (the one that runs your docker daemon) onto your container. Volumes are like storage spaces totally managed by docker. You will find, in the literature, two types … Read more
Persistence of data in Docker There are four possible options to mount any volume: Relative Path Absolute Path Docker Volume Default Path Docker Volume with Absolute Path Here is the example for above: version: ‘3’ services: sample: image: sample volumes: – ./relative-path-volume:/var/data-two – /home/ubuntu/absolute-path-volume:/var/data-one – docker-volume-default-path-volume:/var/data-three – docker-volume-absolute-path-volume:/var/data-four volumes: docker-volume-default-path-volume: {} docker-volume-absolute-path-volume: driver: local driver_opts: … Read more
A Dockerfile defines how an image is built, not how it’s used – so you can’t specify the bind mount in a Dockerfile. Try using docker-compose instead. A simple docker-compose.yml that mounts a directory for you would look like this: version: ‘3.1’ services: mycontainer: image: myimage build: . volumes: – ‘./path/on/docker/host:/path/inside/container’ The build: . is … Read more
Below is the configuration for both types. https://docs.docker.com/compose/compose-file/compose-file-v3/#volumes version: “3.2” services: web: image: httpd:latest volumes: – type: bind source: $HOST/location target: /container/location – type: volume source: mydata target: /container/location volumes: mydata:
As you can read in this GitHub issue, mounting named volumes now is a thing … since 1.11 or 1.12.). Driver specific options are documented. Some notes from the GitHub thread: docker volume create –opt type=none –opt device=<host path> –opt o=bind If the host path does not exist, it will not be created. Options are passed … Read more
The -v (or –volume) argument to docker run is for creating storage space inside a container that is separate from the rest of the container filesystem. There are two forms of the command. When given a single argument, like -v /var/lib/mysql, this allocates space from Docker and mounts it at the given location. This is … Read more
volumes needs to be at the same indentation with services i.e services: #… volumes: db2_prod:
You can change where Docker stores its files including volumes by changing one of its startup parameters called –data-root. If you’re using systemd for service management, the file is usually located at /lib/systemd/system/docker.service. Edit the file as such: # Old – taken from the generated docker.service file in Ubuntu 16.04’s docker.io package ExecStart=/usr/bin/dockerd -H fd:// … Read more