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Check How to share data between Docker containers
Docker is a container platform, which is a standardized, software-defined, portable, virtualized, lightweight environment that allows software to run in isolation from other software running on the physical host machine. Docker is a defining component of the continuous development and integration aspect of software development. By providing a consistent runtime environment, Docker ensures that software behaves in the same way, regardless of the physical host machine it is deployed on.
While Docker containers are self-contained, they sometimes need to share access to data or store data on disk after the container exits. The data may be in the form of databases, log files, or user-generated data. Such data cannot be included in a Docker image configuration file, but must be available for your application to run as expected. Docker Volumes handles data sharing and persistence in Docker containers. Docker volumes can be created and attached to containers during container creation or later.
A container is a way to allow a program to run independently when it is moved from one environment to another. Containerization, on the other hand, is the process of packaging containers to make them easier to scale and improve their portability. With a Docker container, you can quickly develop and run your applications from within your environment.
How to share data between Docker containers
Create a container with data volume
To demonstrate how to share between two containers, you need to create a container (Container1) with a data volume (datavolume1) that you can share later.
- First, create a separate volume that you will share between two Docker containers:
- docker volume create –name DataVolume1
- Next, create a Docker container and name it Container1 with the data volume attached by running the following command:
- docker run -ti –name=Container1 -v DataVolume1:/datavolume1 ubuntu
- Next, create a file on the data volume and add text to it:
- echo “Share this file between containers” > /datavolume1/Example.txt
- Exit the container with the command: exit.
Create a new container and add it to the data volume
Next, create a new container (Container2) that will share files with Container1.
- Create Container2 and mount the volumes in Container1:
- docker run -ti –name=Container2 –volumes-from Container1 ubuntu
- Add text from Container2 to show that both containers can write to DataVolume1:
- echo “This will also appear in DataVolume1” >> /datavolume1/Example.txt
- To exit Container2 use the command: exit
Verify that you can share data between Docker containers
- Restart Container1 to check for data volume changes:
- docker restart Container1
- Confirm that both containers can read and write to the same data volume, and that the text you entered in Container2 appears in DataVolume1:
- cat /datavolume1/Example.txt
- If the text was successfully added to the data volume, the output should show the following:
- Share this file between containers
- This will also appear on DataVolume1
- To finish, exit the container with the command: exit.
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