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37 lines
1.3 KiB
Markdown
37 lines
1.3 KiB
Markdown
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page_title: File Systems
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page_description: How Linux organizes its persistent storage
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page_keywords: containers, files, linux
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# File System
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## Introduction
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In order for a Linux system to run, it typically needs two [file
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systems](http://en.wikipedia.org/wiki/Filesystem):
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1. boot file system (bootfs)
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2. root file system (rootfs)
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The **boot file system** contains the bootloader and the kernel. The
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user never makes any changes to the boot file system. In fact, soon
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after the boot process is complete, the entire kernel is in memory, and
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the boot file system is unmounted to free up the RAM associated with the
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initrd disk image.
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The **root file system** includes the typical directory structure we
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associate with Unix-like operating systems:
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`/dev, /proc, /bin, /etc, /lib, /usr,` and
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`/tmp` plus all the configuration files, binaries
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and libraries required to run user applications (like bash, ls, and so
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forth).
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While there can be important kernel differences between different Linux
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distributions, the contents and organization of the root file system are
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usually what make your software packages dependent on one distribution
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versus another. Docker can help solve this problem by running multiple
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distributions at the same time.
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