You can see same data is present inside the container and in the volume.
Volume deletion is a separate process if you will not defined explicitly then volume will not get deleted But if you delete the volume then data will go away.Now when you run it again you should be able to see all the tables which you have created.Create some tables and then delete the container.You can access the database on the browser and you can see testdb1 database has been created.Now we will see how data will persist even if we remove the container and launch it again. Now you can run this file and can see the volume is created with the name cd Named-Volume/ĭocker-compose up -d How data will Persist? If you don’t declare your variable at the end then you will see the below errorĮRROR: Named volume “db_vol:/var/lib/mysql:rw” is used in service “db” but no declaration was found in the volumes section. You will see a random volume name is generated as shown below Now Let’s create a mysql container which uses Named volume to store the data We will launch a mysql and phpmyAdmin container which uses a docker volume so that all data will persist even if we remove the containerĬlone this repo for trying the below example db_vol:/var/lib/mysql Let’s create a mysql container which uses Anonymous volume to store the data This is the one which people uses in their production environment Named Volume - This will create a volume with the name you provided in your file.Anonymous volume– If you do not provide any name for your volume then a random name is generated.They are often a better choice than persisting data in a container’s writable layer, because a volume does not increase the size of the containers using it, and the volume’s contents exist outside the lifecycle of a given container.Volumes are the preferred mechanism for data persist.volumes - Volumes are stored in the Docker area and managed by Docker only.tmpfs mount - This works only for Docker on linux.This is temporary and only persist in the host memory.bind mount - which uses the filesystem of your local docker host machine to persist/store your data.volume - is the most preferred mechanism for persist the data.If you do not know about Docker, refer my docker article for the basic understandingĬheck out youtube video for this article Three types of storage is present in docker How we can persist the data using docker volumes? We will explore options for the data storage in docker.
In this blog, we will see what is docker volumes and why do we need to use volumes.
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