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Red Hat Enterprise Linux 6.8 or newer is required for 300TiB XFS file system support on RHEL 6.x. The previous maximum supported XFS file system size in RHEL 6.7 and earlier was 100TiB. RHEL 5.1 Release Notes. To create an Ext3 file system larger than 8 TiB, you might need to use the mkfs.ext3 utility with 4K blocks and the -F option. XFS is a high-performance 64-bit journaling file system created by Silicon Graphics, Inc (SGI) in 1993. It was the default file system in SGI's IRIX operating system starting with its version 5.3. XFS was ported to the Linux kernel in 2001; as of June 2014, XFS is supported by most Linux distributions, some of which use it as the default file. What is FUSE?¶ FUSE is a userspace filesystem framework. It consists of a kernel module (fuse.ko), a userspace library (libfuse.) and a mount utility (fusermount). One of the most important features of FUSE is allowing secure, non-privileged mounts. This opens up new possibilities for the use of filesystems.

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OverlayFS is a modern union filesystem that is similar to AUFS, but fasterand with a simpler implementation. Docker provides two storage drivers forOverlayFS: the original overlay, and the newer and more stable overlay2.

This topic refers to the Linux kernel driver as OverlayFS and to the Dockerstorage driver as overlay or overlay2.

Note: If you use OverlayFS, use the overlay2 driver rather than theoverlay driver, because it is more efficient in terms of inode utilization.To use the new driver, you need version 4.0 or higher of the Linux kernel,or RHEL or CentOS using version 3.10.0-514 and above.

For more information about differences between overlay vs overlay2, checkDocker storage drivers.

Note: For fuse-overlayfs driver, check Rootless mode documentation.

Prerequisites

OverlayFS is the recommended storage driver, and supported if you meet the followingprerequisites:

Version 4.0 or higher of the Linux kernel, or RHEL or CentOS usingversion 3.10.0-514 of the kernel or higher. If you use an older kernel, you needto use the overlay driver, which is not recommended.
The overlay and overlay2 drivers are supported on xfs backing filesystems,but only with d_type=true Build yagi antenna wifi. enabled.
Use xfs_info to verify that the ftype option is set to 1. To format an xfs filesystem correctly, use the flag -n ftype=1.
Warning: Running on XFS without d_type support now causes Docker toskip the attempt to use the overlay or overlay2 driver. Existinginstalls will continue to run, but produce an error. This is to allowusers to migrate their data. In a future version, this will be a fatalerror, which will prevent Docker from starting.
Changing the storage driver makes existing containers and images inaccessibleon the local system. Use docker save to save any images you have built orpush them to Docker Hub or a private registry before changing the storage driver,so that you do not need to re-create them later.

Configure Docker with the `overlay` or `overlay2` storage driver

It is highly recommended that you use the overlay2 driver if possible, ratherthan the overlay driver. The overlay driver is not supported forDocker EE.

To configure Docker to use the overlay storage driver your Docker host must berunning version 3.18 of the Linux kernel (preferably newer) with the overlaykernel module loaded. For the overlay2 driver, the version of your kernel mustbe 4.0 or newer.

Fuse-xfs Mac Os X

Before following this procedure, you must first meet all theprerequisites.

The steps below outline how to configure the overlay2 storage driver. If youneed to use the legacy overlay driver, specify it instead.

Stop Docker.
Copy the contents of /var/lib/docker to a temporary location.
If you want to use a separate backing filesystem from the one used by/var/lib/, format the filesystem and mount it into /var/lib/docker.Make sure add this mount to /etc/fstab to make it permanent.
Edit /etc/docker/daemon.json. If it does not yet exist, create it. Assumingthat the file was empty, add the following contents.
Docker does not start if the daemon.json file contains badly-formed JSON.
Start Docker.
Verify that the daemon is using the overlay2 storage driver.Use the docker info command and look for Storage Driver andBacking filesystem.

Docker is now using the overlay2 storage driver and has automaticallycreated the overlay mount with the required lowerdir, upperdir, merged,and workdir constructs.

Continue reading for details about how OverlayFS works within your Dockercontainers, as well as performance advice and information about limitations ofits compatibility with different backing filesystems.

How the `overlay2` driver works

If you are still using the overlay driver rather than overlay2, seeHow the overlay driver works instead.

OverlayFS layers two directories on a single Linux host and presents them asa single directory. These directories are called layers and the unificationprocess is referred to as a union mount. OverlayFS refers to the lower directoryas lowerdir and the upper directory a upperdir. The unified view is exposedthrough its own directory called merged.

The overlay2 driver natively supports up to 128 lower OverlayFS layers. Thiscapability provides better performance for layer-related Docker commands suchas docker build and docker commit, and consumes fewer inodes on the backingfilesystem.

Image and container layers on-disk

After downloading a five-layer image using docker pull ubuntu, you can seesix directories under /var/lib/docker/overlay2.

Warning: Do not directly manipulate any files or directories within/var/lib/docker/. These files and directories are managed by Docker.

The new l (lowercase L) directory contains shortened layer identifiers assymbolic links. These identifiers are used to avoid hitting the page sizelimitation on arguments to the mount command.

The lowest layer contains a file called link, which contains the name of theshortened identifier, and a directory called diff which contains thelayer’s contents.

The second-lowest layer, and each higher layer, contain a file called lower,which denotes its parent, and a directory called diff which contains itscontents. It also contains a merged directory, which contains the unifiedcontents of its parent layer and itself, and a work directory which is usedinternally by OverlayFS.

To view the mounts which exist when you use the overlay storage driver withDocker, use the mount command. The output below is truncated for readability.

The rw on the second line shows that the overlay mount is read-write.

How the `overlay` driver works

This content applies to the overlay driver only. Docker recommends using theoverlay2 driver, which works differently. SeeHow the overlay2 driver worksfor overlay2.

OverlayFS layers two directories on a single Linux host and presents them asa single directory. These directories are called layers and the unificationprocess is referred to as a union mount. OverlayFS refers to the lower directoryas lowerdir and the upper directory a upperdir. The unified view is exposedthrough its own directory called merged

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