Volume in Docker is a way to store persistent data and is used for containerized applications. It allows the same container to be used multiple times with different application files or data, without having to build the image every time. Volume is a special type of directory that exists outside of the UFS file system and persists even if the container is deleted. Therefore, if an application needs to use the same data multiple times, volumes can be used to persist the data between usage.
Volumes can be used in a variety of ways. For example, they can be used to store and share configuration data between containers; they can also be used to store database files, allowing multiple applications to access the same data without needing to rebuild the image each time. Additionally, volumes can be used to share files between containers and the host machine, allowing users to manage files using their own operating system instead of the container’s operating system.
In addition to providing a means of sharing data, volumes also offer some additional benefits. First, because the data stored in a volume is outside of the UFS file system, it is not affected by changes made within the container. Therefore, any changes made will persist across multiple uses of the container. Secondly, volumes provide improved security, as the data stored in a volume can only be accessed by the user or group who created it. Finally, volumes are much faster than a traditional storage solution as they don’t require the operating system to read or write data from disk.
In summary, volumes provide an easy way to store data that persists across multiple uses of a container, as well as some additional benefits such as improved security and improved performance. They are a great way to share configuration data between containers, as well as to store database files that can be accessed by multiple applications.
