Volumes on the other hand live under the docker engine, it behaves more or less like a virtual hard drive, managed by docker and the files inside it are not accessible from the host computer.Īdd a volume to docker-compose is rather simple, it's similar to bind mounts, but with the difference that you need to add the volume under the volumes array in the main docker-compose.yml, and in the service configuration you use the syntax :, for example if we want to store the data in a container called mongodata, our docker-compose. When you execute a docker-compose command, the volumes directive in docker-compose.yml file mounts source directories or volumes from your computer at. The only problem with bind mounts, is that the folder is managed by the host computer, so if you change file permissions, or you delete a file for example, you will corrupt the data in the container, which could lead to errors or the container not working anymore. Note: /data/db is where the MongoDB image store the databases data, this will be different on other databases like Redis, MariaDB, MySQL, etc. The Long syntax is also available for Docker Compose, for example: volumes: - type: volume source: volume-data target: /container-path 3.2. db folder, which is going to contain all the data stored in the database. Once we define the volumes we created earlier, we can add the mount in the service in the form of named-volume:container-path. So what you will see that from your host machine, you will see a. This container uses a Docker volume so that the. With a bind mount our project will look like this: As you may have noticed, your applications docker-compose.yml file contains an entry for a MySQL container. Whichever you choose, once you have set up a volume to the folder where the data is stored in the container, if you do a docker-compose down, and then a docker-compose up, your data will not be erased and it will become persistent.īind Mounts are volumes that mount to a host path, and they can be modified by other processes outside docker.Įssentially it shares a folder with your host computer and the container, and it's defined with the syntax. There are two ways where you can create a volume, bind mounts and volumes. :/app Finally, we need to migrate the environment variable definitions using the environment key. services: app: image: node:18-alpine command: sh -c 'yarn install & yarn run dev' ports: - 127.0.0.1:3000:3000 workingdir: /app volumes:. Your 'working directory' for the compose file is just './'. Enter fullscreen mode Exit fullscreen modeĪs it is, once you start the containers, everything will work fine, you can save data on the database, you can read from it, etc.īut, the very moment you do docker-compose down, the containers will be removed by docker, and all the data will be gone!.Īnd that's probably fine with you as you don't need anything to persist, but in the other case, what you need to do is to use volumes. One advantage of Docker Compose volume definitions is we can use relative paths from the current directory. / for you current directory that the Docker-compose file is in.
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