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Questions tagged [unionfs]

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Separate default configurations and my own changes with a layered FS : /Data/etc/ upper layer in RO and /etc/ lower layer in RW?

I wish to separate the default packages configuration files (/etc/), and the configuration files I edited e.g. in /Data/etc/ (normally should be /usr/local/etc/, but let assume /Data/etc/). This to ...
Denis Migdal's user avatar
0 votes
1 answer
58 views

How to instruct systemd to use a specific unionfs for /home

Context: Say I have two workplaces. Currently, I carry a laptop along, and have external HDs staying in these workplaces to hold backups. Now, I'm given the opportunity to have a desktop in both ...
L. Levrel's user avatar
  • 1,503
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0 answers
42 views

How make multiple files available as one, akin to symlinking?

Is there a way to take a list of files and make them available under a single name (in a read-only fashion)? Let's say I have: f1.txt f2.txt f3.txt And I would like to read sequentially through all ...
miku's user avatar
  • 673
0 votes
1 answer
621 views

How to make multiple NFS host directories appear as one on NFS client?

I have 6 Ubuntu VM's on one network. Five of them has 2 TB disks attached. I have created NFS directories for those disks and share them on the last VM that acts as a client and a server. How I can ...
risk_ltu's user avatar
  • 121
11 votes
1 answer
839 views

Has anybody heard of (a trick to make) a local hard drive based cache of NFS? (primarily in FreeBSD)

Problem: NFS can be slow, when starting binaries (e.g. /usr/bin) over NFS, such as in a network booted system. RAM buffer cache might not be sufficient to avoid slowness. Idea: it seems we should be ...
Gunther Schadow's user avatar
2 votes
0 answers
310 views

Using unionfs or similar as root file system in Linux?

After building Linux From Scratch several times I realized that package management is really a hard thing to do. After thinking for some time, I came across an idea. My idea is to install all packages ...
Akib Azmain Turja's user avatar
6 votes
1 answer
2k views

/etc/fstab - fuse-compatible alternative to nofail

I want to join several external usb-disks with mergerfs to one large data-storage. Because the disks might not be available at all times I added the nofail-option, to prevent errors during boot. This ...
Gedi Nixan's user avatar
9 votes
1 answer
2k views

Stackable file system that works like a cache

I am looking for a stackable file system (Like UnionFS, aufs, and OverlayFS) that works similar to bcache or lvmcache but on file level - not on block level: Reads will be done from top-layer. If the ...
Ole Tange's user avatar
  • 35.7k
1 vote
1 answer
712 views

Which (if any) union filesystems allow you to mount them without an underlying filesystem?

I am considering using a union filesystem, such as aufs, UnionFS or OverlayFS. I have a 138GB of Android source, to which I want to make minor changes and keep them under version control. My plan is ...
fadedbee's user avatar
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0 votes
1 answer
1k views

Hard links with MergerFS

If someone uses the command "cp -alr" on a directory located in a non-path preserving merged pool will it always create a directory on the same disk with all of its contents as hard links? For ...
Pusdeo Squirrel's user avatar
1 vote
1 answer
1k views

Mount fuse.mergerfs in udev script

I use a udev rule to recognize when a specific USB stick is plugged. When it's plugged in, a bash script is started which mounts some devices. That works very well after I did some changes to the ...
Biggie's user avatar
  • 243
1 vote
2 answers
1k views

Can aufs be used as fuse filesystem like unionfs-fuse?

I'm experimenting with different union/overlay filesystem types. I've found unionfs-fuse package in Ubuntu which allowed me to use unionfs mount command as non-root user. But it seems aufs, which is ...
Anwar's user avatar
  • 123
1 vote
2 answers
1k views

How safe is it to use unionfs in FreeBSD?

From man mount_unionfs: BUGS: THIS FILE SYSTEM TYPE IS NOT YET FULLY SUPPORTED (READ: IT DOESN'T WORK) AND USING IT MAY, IN FACT, DESTROY DATA ON YOUR SYSTEM. USE AT YOUR OWN RISK. BEWARE OF DOG. ...
Stilez's user avatar
  • 1,271
1 vote
1 answer
1k views

How to limit how much disk space a folder can use?

I have 2 hdd storage boxes I share with my linux server which has a SSD of ~500 GB. I want to merge the 3 folders into one and I'm using unionfs for that. I need it to download data on it. How can I ...
Freedo's user avatar
  • 1,265
31 votes
2 answers
21k views

Unionfs vs Aufs vs Overlayfs vs mhddfs, which one do I use

I have randomly been reading about union file system which enables a user to mount multiple filesystems on top of one another simultaneously. However, am finding trouble deciding on which one to use(...
David Okwii's user avatar
1 vote
2 answers
595 views

Recommended way combining smaller partition into One large directory

I have a particular partition on my server (/var) that's filling up in a few days. Am running a busy mail server and all user mails go here. However, now I need to increase the storage in order to ...
David Okwii's user avatar
2 votes
0 answers
183 views

chroot of entire filesystem, except for one file

I want to create a chroot for a command that I'll run, and I want the chroot to be completely identical to the "real" filesystem, except for one altered file. (Let's just assume that this is indeed ...
jwd's user avatar
  • 1,477
2 votes
0 answers
243 views

unionfs for cifs mounts

I want to merge some cifs mounts together. There are /extDrives/cifs_001 /extDrives/cifs_002 /extDrives/cifs_003 /extDrives/cifs_common cifs_common should show all content of cifs_00* Writes to ...
Rüdiger Gubler's user avatar
1 vote
1 answer
276 views

Mount unionfs (or aufs) branches fed from stdin?

Is it possible to feed the branch paths from stdin to the mount (or mount_unionfs) command, instead of supplying them as arguments or from a file? cat ~/dirs_with_photos.txt | mount -t unionfs I don'...
Sridhar Sarnobat's user avatar
3 votes
1 answer
3k views

Ubuntu 16.04 with read-only filesystem and writable layer

(This is a cross post from askubuntu, as I think here are more people to know how to get this working) I want to set up Ubuntu 16.04 like a live CD. This worked great in Ubuntu 12.04 but with 16.04 ...
Michael's user avatar
  • 1,673
3 votes
1 answer
457 views

overlay-filesystem that can differentiate between metadata and file content?

AFAIK with aufs when a file is touched (ie. only it's metadata changed, not it's contents), then the copy-on-write mechanism of the file system will copy the whole file into the r/w layer, essentially ...
Udo G's user avatar
  • 1,123
2 votes
0 answers
960 views

Is there a "supported" way in RHEL/CentOS 7 to union-mount a directory tree on top of an NFS mount point?

I have an NFS share containing almost 500 chrooted (s)ftp user's home directories. This NFS share is mounted on several FTP servers forming a highly available FTP cluster. I would like to enable ...
MattBianco's user avatar
  • 3,726
7 votes
1 answer
3k views

chroot with unionfs-fuse, can't access /dev/*

I have created the a chroot jail in combination with unionfs-fuse so that I don't need to install another system inside it. However, the resulting system's /dev entries are not readable.This is ...
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