Docker is an open-source containerization platform that allows developers to create and run applications in a portable and efficient manner. PostgreSQL, on the other hand, is an open-source relational database management system. In this article, we will discuss how to mount a Docker volume to a PostgreSQL container.
What is a Docker Volume?A Docker volume is a persistent data storage mechanism that can be used to share data between containers or between a container and the host machine. When a container is deleted, the data stored in a Docker volume is not lost.
Mounting a Docker Volume to a PostgreSQL ContainerTo mount a Docker volume to a PostgreSQL container, we need to follow a few simple steps. We assume that Docker and PostgreSQL are already installed on your system.
Step 1: Create a Docker Volume
To create a Docker volume, run the following command:
docker volume create my_volume
Step 2: Start the PostgreSQL Container
To start the PostgreSQL container and mount the Docker volume to it, run the following command:
docker run --name postgres -e POSTGRES_PASSWORD=mysecretpassword -d -v my_volume:/var/lib/postgresql/data postgres
In this command, we have specified the following parameters:
--name postgres: This specifies the name of the container.
-e POSTGRES_PASSWORD=mysecretpassword: This sets the password for the PostgreSQL user.
-d: This runs the container in the background.
-v my_volume:/var/lib/postgresql/data: This mounts the Docker volume
/var/lib/postgresql/datadirectory inside the container.
postgres: This specifies the name of the Docker image to use.
Step 3: Connect to the PostgreSQL Container
To connect to the PostgreSQL container, run the following command:
docker exec -it postgres psql -U postgres
This command will open the PostgreSQL command-line interface. You can now create tables and perform other database operations.
More ExamplesTo mount multiple Docker volumes to a PostgreSQL container, you can specify multiple
-vparameters in the
docker runcommand. For example, to mount two Docker volumes named
my_volume2, run the following command:
docker run --name postgres -e POSTGRES_PASSWORD=mysecretpassword -d -v my_volume1:/var/lib/postgresql/data1 -v my_volume2:/var/lib/postgresql/data2 postgres
You can also mount a Docker volume to a specific directory inside the container. For example, to mount the Docker volume
my_volume to the
/mydata directory inside the container, run the following command:
docker run --name postgres -e POSTGRES_PASSWORD=mysecretpassword -d -v my_volume:/mydata postgres
In this article, we have discussed how to mount a Docker volume to a PostgreSQL container. By following these simple steps, you can easily share data between containers or between a container and the host machine. Docker volumes provide a convenient way to store and manage persistent data in Docker containers.
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That's it for this post. Keep practicing and have fun. Leave your comments if any.