Questions tagged [bind-mount]

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Creating bind mounts at Linux installation time

Generally, when we install a Linux distro (I'll use Ubuntu-like distro as an example, but can be any distro), we define partitions and mount points that will be applied to a disk, after we click on "...
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1answer
72 views

Why can I not bind a mount namespace to a file

I observe the following: As unprivileged user in shell No 1: user@box:~$ sysctl kernel.unprivileged_userns_clone kernel.unprivileged_userns_clone = 1 user@box:~$ unshare --mount --user nobody@box:~$ ...
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1answer
1k views

How to get mount information of host inside a docker container

I need the mountpoints of all disks attached to a host inside a docker container. The mount information is available in /proc/1/mounts file, but I cannot access that file on all OS. When I run the ...
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54 views

Is linux mount propagation asynchronous to the mount call?

I have two processes in different mount namespaces. They have a shared directory bind mounted to /mnt/share. The "master" uses MS_SHARED propagation for the mount, while the "slave" uses MS_SLAVE. ...
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25 views

Data partition and IntelliJ IDEA external file sync speed

I recently reconfigured the filesystem on my laptop so I can share my data with a second Linux. The Linux used in this matter is Fedora 28, 64-bit. My disks are now laid out like so: /dev/sda: /dev/...
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1answer
49 views

Mounting is slow after 4000 mounts

I have a need to create about 10,000 total bind mounts for various chroots. After about 3000-4000 mounts, it slows down significantly from 100/s to about 5-10/s. I'm assuming it's hitting some weird ...
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1answer
241 views

Mounting using alternate fstab file

I need to use an alternative fstab file for mounting a folder in another folder, like the command mount --bind /folder1 /folder2 I tried the command mount --fstab /pathToFile.fstab as stated in ...
3
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1answer
343 views

/etc/fstab fails to bind mount on boot, but running mount -a works correctly

I'm running a modified WD MyCloud (Gen 1) NAS with Debian 8 (Jessie) installed on it. Due to the nuances of the device, I can't resize the root partition, and am struggling with space on it. To ...
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1answer
69 views

Copy dir and its contents in RAM and backup on the original dir

I'd like to copy a dir and its contents in RAM, do my routines and periodically make some backups/sync on my original dir. So if I have a dir mydir/ with 2 files: $ ls mydir/ file1.tex file2.tex I ...
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47 views

Bind mounts within bind mounts

I am trying to bind mount one file over another file, then remove the file that is now hidden from access. I'm trying to go about this as follows: folder1# echo a > a folder1# echo b > b ...
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What exactly happens behind a bind mount? (Linux 4.x)

From the answer to What is a bind mount?, It is possible to unmount /some/where, in which case /else/where remains mounted. I checked the output of mount after performing a bind mount. The ...
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Bind mounted /var to /raid5/var and CentOS fails to boot

System Background: I am running CentOS 7 in a VM (in VirtualBox) on a host computer running Windows 10. My /dev/sda is on an SSD and then I have three 1TB HDDs /dev/sdb, /dev/sdc, and /dev/sdd ...
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1answer
89 views

Why do repeated bind mounts create entries for the source directory?

Why does a repeated bind mount create multiple entries in /proc/mounts? # md -p /mnt/test-mount/{source,target} # mount --bind /mnt/test-mount/{source,target} # grep test-mount /proc/mounts /dev/...
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1answer
35 views

How to See Bound Folders and Release Them

This morning I noticed someone had stuck a USB Drive in the back of the server. (I'll have to end that practice later). For some reason CentOS 7 mounted that disk /dev/sdc1 under /run/media//. I also ...
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2answers
62 views

Calculating directory size without subdirectories bind-mounted from the same device

I want to calculate a directory size with all its subdirectories. But I had made some of the subdirectories to mount from a mount point. (using mount -B/--bind) when I use du -hks the returned size ...
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1answer
330 views

How to tell systemd to create a bind mount when plugging in an automounted drive?

I have the following mount and automount units enabled for my external USB drive. Mount Unit: [Unit] Description=Time Machine Drive Mount Service [Mount] What=/dev/disk/by-uuid/some-uuid Where=/...
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1answer
832 views

Why can't I bind-mount “/” inside a user namespace?

Why doesn't this work? $ unshare -rm mount --bind / /mnt mount: /mnt: wrong fs type, bad option, bad superblock on /, missing codepage or helper program, or other error. These work ok: $ unshare -...
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46 views

Multiple network shares to single mount point?

How would I mount multiple network shares to single mount point? Example //10.50.154.6/data 42T 22T 21T 51% /mnt/data6 //10.50.154.7/data 8.1T 6.2T 1.9T 77% /mnt/data7 //10.50.154.8/...
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529 views

How to unmount a recursive bind mount - safely [duplicate]

Please take care that you have no unsaved work if you test this. I ran this command as an experiment, but how can I undo it without rebooting? # mount --rbind / /mnt What I have tried # umount /...
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1answer
105 views

Lazy unmount root jail drives

I have created a root jail containing rpm and yum (centos 7.5) to install some software on the original system. Workflow Mount sys, proc, dev to the root jail Mount root of the original system "/" ...
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2answers
121 views

Making a bind-mount take effect only in the context of the current process and its descendants

I have 2 files: /MyDir/a and /MyDir/MySubDir/b and am running a bash script, to which I want to add code to make file /a point to file /b, but only in the current process and its descendants. In ...
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1answer
393 views

Shadow bind mount in fstab

I have a custom, non-default Ubuntu installation, where I use my other Linux distro's boot manager (rEFInd). As such, I don't want Ubuntu to see my EFI partition, on the principle that it has no ...
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1answer
572 views

How to create a mount --bind when root does not have permission to access the source directory?

While trying to create a test environment using mount --bind I was surprised to find that it sometimes fails with permissions errors because root cannot access the source directory. This only appears ...
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1answer
353 views

How to exclude bind mounts from findmnt results list?

In a bash script I have the following lines: TARGETS="$(findmnt -n -v -t btrfs -o TARGET --list)" UUIDS="$(findmnt -n -v -t btrfs -o UUID --list)" I run this script on some servers (running Arch ...
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166 views

How do I mount a file on top of a broken symbolic link?

In preparation of a chroot I'm doing an mount --bind /etc/resolv.conf ${MOUNTPOINT}/etc/resolv.conf. I need this because the ${MOUNTPOINT} contains a broken etc/resolv.conf. However, mount is ...
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2answers
338 views

Meaning of statement that 'getcwd functions work correctly' in FreeBSD man page for mount_nullfs?

In FreeBSD, man mount_nullfs states that: The primary differences between a virtual copy of the file system and a symbolic link are that the getcwd(3) functions work correctly in the virtual ...
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1answer
1k views

bind mounting source to itself

What does mount --bind /dir1 /dir1 do? I've read https://www.kernel.org/doc/Documentation/filesystems/sharedsubtree.txt however it doesn't give a clear explanation. Looks like it is valid not only for ...
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1answer
605 views

why do Linux bind mounts disappear if the mount point's inode changes?

In summary: if you bind mount a file /tmp/a on top of /tmp/b in a new mount namespace, but then the inode of /tmp/b changes in the parent namespace, the bind mount disappears in the child namespace. I'...
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174 views

`umount -R` on bind mounts takes a non-neglible amount of time, why?

Why does umount -R take 0.2s to unmount this subtree of bind mounts? It only took 0.02s to mount the subtree, and 0.00s to change its propagation flags. (I was looking at cloning the current set of ...
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1answer
15k views

Editing /etc/fstab to permanently bind mount directory

I wish to make the following mount permanent: [michael@devserver ~]$ findmnt | grep public └─/home/jail/home/public/repo /dev/mapper/centos-root[/home/michael/testing/gateway/repo] xfs ...
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2answers
2k views

Mount --bind in the same filesystem move files as in the same filesystem

If I mount --bind /a in /b and if I mv /a/bigfile /b/ it will take a lot of type (if the origin file is big). This will actually copy the file and then delete from the origin instead of simple update ...
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1answer
492 views

How to unmount a mountpoint with rbind and rslave?

Trying to use a chrooted system via mount -B stage3 gentoo mount -t sysfs none gentoo/sys mount -t proc none gentoo/proc mount -R /dev gentoo/dev mount --make-rslave gentoo/dev unshare --fork chroot ...
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277 views

how could the df command show the right mounts?

Under redhat 7, given this fstab where a "bind mount" across file systems is defined: /dev/mapper/datab_vg-lv_db /appli/postgres xfs defaults 0 0 /appli/postgres/var /var/...
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2answers
104 views

Why are these mounts needed before updating initramfs?

After reading this answer on bind mount, I got the idea that a bind-mount in Linux is to reproduce part or an entire filesystem under another point in the directory tree. So when we write the ...
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2answers
2k views

Why can't I create a `hardlink` to a file from a “mount --bind” directory on the same filesystem?

Original Problem I have a file on one filesystem: /data/src/file and I want to hard link it to: /home/user/proj/src/file but /home is on one disk, and /data is on another so I get an error: $ cd /...
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75 views

Making root being bind mounted

I have XUbuntu and Arch on a laptop, I'm sharing /boot partition between these distros mounting it on /mnt/boot and bind-mounting /mnt/boot/xubuntu or /mnt/boot/arch onto /boot; it works fine even ...
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5answers
1k views

Link 2 existing files

I have 2 existing files : abcd and xyz. $ cat abcd abcd $ cat xyz xyz Now, when I try to softlink these files, I get this message : ln: cannot create xyz: File exists I do not want to use ln -sf ...
2
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1answer
378 views

ls -la doesn't display correct permission for a mount --bind folder

Please read the following steps to understand my problem, Execute following commands mkdir ~/src mkdir ~/destination sudo mount ~/src ~/destination --bind -o ro src folder has been bind mounted to ...
2
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1answer
626 views

Mounting two folders to corresponding directories within external volume?

I'm trying to mount /etc/folder and /var/folder to the same external volume UUID=xyz. This external volume already has subdirectories etc_folder and var_folder and has been formatted and available to ...
1
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1answer
1k views

Bind USB drive to home directory on demand

I was trying to attach specific USB drive to home folder of the user. I have installed vsftpd, but Kodi can't move on upper hierarchy. So he can't access /media folder, but FileZilla can. My USB is ...
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0answers
316 views

Debian install, mounting /var /tmp /home in the same partition

I'm making a new Debian install. I have a SSD and an HDD. My idea was to put /home, /var and /tmp on the same partition in the HDD, and the rest (/) in a tiny partition in the SSD. I followed this ...
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0answers
236 views

openvpn route-up script no mount permissions

I'm trying to mount a couple of nfs shares after my openvpn tunnel is up. Previously this worked on ubuntu 12.04 and ubuntu 14.04. I made a clean install with ubuntu 16.04 and can't get it to work. ...
3
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1answer
802 views

How can I automatically make ZFS filesyatems mount shared / rshared?

I have a number of ZFS sub-filesystems (so that I can granularly manage snapshots and ZFS options) like so: tank/media tank/media/pictures tank/media/pictures/photos tank/media/movies tank/media/...
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1answer
141 views

/root as bind mount?

I am migrating my system from Debian 32 bit to Debian 64 bit. It is installed on /dev/sda2, so I created /dev/sda3, installed the new system there, synched installed packages and configuration files ...
1
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1answer
294 views

find: fts_read: Permission denied through mount_nullfs

I have the following set-up: FreeBSD 10.3 with ZFS on root. A ZFS volume hierarchy (multiple volumes nested in each other, for lack of a better name) is duplicated using mount_nullfs in order to ...
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2answers
3k views

How is findmnt able to list bind mounts?

A lot of people keep saying that Linux does not keep information about bind mounts, so there is no way to get a list of them and their sources. Here are some examples: from one of the the comments ...
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0answers
1k views

CentOS 7 - Can't mount /var/tmp as bind

I'm working on a freshly installed CentOS7 with LVM. I want to bind mount /var/tmp to /tmp and added the following to /etc/fstab. /tmp /var/tmp none rw,nodev,noexec,nosuid,bind 0 0 ...
2
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1answer
424 views

use a different socket than /dev/log, system-wide

Is there a way to make a whole Debian (Jessie) installation use a different syslog socket than /dev/log (like, for example, /tmp/my-other-log) ? Reason: I'm running Debian Jessie in a chroot ...
4
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2answers
686 views

Mounting new filesystem affects non-recursive bind mounts?

It hasn't always behaved this way, but nowadays I get this inconsistent behaviour. Bind mounts don't copy existing mounts (unless you use --rbind), but new mounts (and unmounts) get copied ...
3
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0answers
231 views

Workaround for mount -bind behavior change between wheezy and jessie?

I recently upgraded a system from wheezy to jessie that makes use of bind mounts. But with the update the behavior of the bind mount has changed, and now acts as bind one filesystem will recursively ...