How to share docker data volumes

Shared data volumes allow multiple containers to access the same data. The steps include: creating a data volume, mounting the data volume to a container, and copying the same data volume to another container. Notes include: All changes to the container are immediately visible, with the same permissions, and compatibility. Example: Create a database file data volume, mount it to database and web containers, so that they can both access the database files.

How to share Docker data volumes

Introduction
In Docker, data volumes are used to persistently store data between containers and hosts. Shared data volumes allow multiple containers to access the same data.

Steps
In order to share a data volume, the following steps are required:

1. Create a data volume
Create a data volume using docker volume create create command. For example:

 <code>docker volume create shared-data</code>

2. Mount the data volume to the container
Use the -v ( --volume ) option to mount the data volume to the container. For example:

 <code>docker run -v shared-data:/data my-image</code>

3. Copy the same data volume to another container
mount the same data volume to another container by using the -v option again. For example:

 <code>docker run -v shared-data:/data another-image</code>

Things to note

• All container changes to data are immediately visible when sharing a data volume.
• Make sure all containers have the same permissions to the data volume.
• Different containers may use different data formats, so verify compatibility before sharing data volumes.

Example
Suppose there are two containers, web and database . To share a data volume containing a database file, you can do the following:

1. Create a data volume:

 <code>docker volume create my-data</code>

2. Mount the data volume to database container:

 <code>docker run -v my-data:/var/lib/db my-database-image</code>

3. Mount the same volume to the web container:

 <code>docker run -v my-data:/var/www/html my-web-image</code>

Both web and database containers will now be able to access database files stored in my-data data volumes.

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