Configuring Storage in Docker
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Configuring storage in Docker refers to the process of creating and managing data stores used in containers. Storages allow you to save data between container launches, ensuring their safety and availability.
Why do I need to configure storage
Configuring storage in Docker allows you to manage and save data used in containers. This is important because containers are immutable by default and all changes made inside the container are lost after it is stopped or deleted.
It also makes it possible to save data between container launches, ensuring their safety and availability. This is especially useful for applications that require persistent data storage, such as databases or file systems.
In addition, it makes it easy to scale applications, since data can be shared between several containers or used as a shared resource for all containers.
In general, configuring storage in Docker provides reliable and flexible data management in containers, which makes them more convenient and efficient to use.
Storage Types
There are several types of storage in Docker:
- Volumes: special directories on the host machine or remote server that are mounted in a container. They provide permanent data storage and can be used for data exchange between containers.
- Bind mounts (bound mounts): a mechanism that allows you to mount a specific directory or file on the host machine into a container. This allows containers to access data on the host machine and share data between multiple containers.
- tmpfs mounts: a mount mechanism that allows you to create temporary file systems in memory. They are useful for storing temporary data that does not need to be saved between container launches.
Configuring storage in Docker allows you to manage and configure these types of storage, as well as specify which containers should use which storage. This makes it possible to store and access data in containers, and also provides flexibility and scalability of applications.
How to configure storage in Docker
The storage configuration in Docker can be done using the -v or --volume option when starting the container.
Here are a few ways to configure:
Linking a local directory to a directory in a container:
Creating and Using Docker Volume:
Using external storage, such as NFS or AWS EBS:
Using Docker Compose to configure Storage:
version: '3'
services:
myservice:
image: <image_name>
volumes:
- /path/to/local/directory:/path/to/directory/in/container
- <name_volume>:/path/to/directory/in/container
- <store_name>:<path_in_container>
When configuring storage in Docker, you can also use other options, such as --mount for more complex mounting scenarios, or --volumes-from to use storage in another container.
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