Questions tagged [root-filesystem]
The root filesystem (`/`) contains the kernel and utilities needed to boot a system.
177
questions
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31 views
How can “No Space left on device” cause failure execution of commands for its recovery? [on hold]
I mean suppose I have got this error when writing a file on the root disk. Why would my command execution ( for read ) be affected due to this.
If I try to read the file or filesystem information, I ...
0
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0answers
11 views
mmcblk mounted as 1 -> root=UUID fail finding rootfs
I just upgraded Linux kernel (from 3.10 to 4.14), and now mmcblk rootfs partition as mmcblk1 (while in the older kernel in mmcblk0).
I would have assumed that things should yet boot correctly from ...
0
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0answers
33 views
How do I create an ethernet device file in unix - debian based embedded systems?
In my root file system, I can see that I have a directory /sys/class/net/eth0/.
However, I want to create another interface /sys/class/net/eth1 and /sys/class/net/eth2.
How can I do so?
I am ...
0
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0answers
12 views
backup privileged data on remote servers without root ssh
I'm sufficiently new to Linux that I don't understand how to do what I think I want. If you think you know what I actually want, please tell me.
I would like to use Duplicity to backup privileged ...
0
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1answer
67 views
Linux permission denied
Every single command I run gives me permission denied as root, this happened shortly after I changed /etc/fstab and remounted ext4.
The only commands I appear to be able to run is echo and cd, not ...
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0answers
22 views
Got stuck in Emergency mode with ACPI Error
I am using ubuntu 16.04. I probably have done sth which damaged the system file. After reboot, I am stucked in emergency mode. The error is about ACPI like below. I am not sure what is wrong here. ...
-1
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2answers
30 views
Contents of /var/run persist across reboots
Does it mean my distro is broken (it's a custom distro for a board I'm using, it could easily be buggy)? Can I tweak this behaviour?
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1answer
47 views
move system partitions to different physical drive with different filesystem
My RHEL7 system is configured like this:
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 50G 18G 33G 36% /
/dev/mapper/rhel-home 504G 147G 357G 30% /home
/...
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41 views
How to configure embedded linux kernel so that the file system is visible on the host linux
I am using a powerpc, and after building and flashing the linux kernel on the device I can see the file system. But if I try to create a user or make any changes they get erased and resets to default ...
1
vote
1answer
502 views
Error when booting live-usb device
While booting a live-usb system, the following errors are returned:
Attempting to mount media /dev/sda2
[...] EXT4-fs (sda2): Unrecognized mount option "uid=1000" or missing value
[...] EXT4-fs (...
1
vote
2answers
80 views
Is it accurate to say that the Linux partition is “mounted” to the “/” directory?
Say we have a partition called /dev/sda2, in order to use this partition, we have to mount it to some directory, for example we can mount it to the /mnt/sda2 directory.
Now say that Linux is ...
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0answers
36 views
Why is / called root, but there's also a use called root? [duplicate]
So in a unix system, / is root. But the default admin is also root. So why do these two quite different things have the same name.
2
votes
1answer
58 views
Making space available to my main partition
I have a cloud hosting provider, I pay for 120GB but only get 50GB and I need to make this space available on my main partition (?).
My hosting provider has not been very helpful, below is my fdisk -...
2
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0answers
107 views
how is the boot directory of the EFI/ESP partition related to the boot directory of the root partition?
are the files inside these 2 directories mirror images of each other?
how are they related? for example the below command that i execute:
sudo cp -a initramfs-4.18.16-300.fc29.x86_64.img /boot/EFI/...
1
vote
2answers
361 views
Rootfs versus kernel confusion [closed]
I know that they are two different entities. Rootfs is a file system which describes how to store and access data. The kernel is actual code which executes.
However, isn't the kernel code stored ...
1
vote
1answer
283 views
VFS: Cannot open root device mmcblk1p1 or unknown-block(179,33)
I am trying to run Linux on custom board based on Nvidia TK1. When I try to boot the board from SD card, I get following error:
VFS: Cannot open root device "mmcblk1p1" or unknown-block(179,33): ...
0
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1answer
52 views
Moving / directory in linux
I installed ubuntu with dual boot alongside Windows 8. While partitioning I allocated 9.8 GB to the root directory of linux.Now i am short on space with only 700MB space remaining in this root ...
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0answers
171 views
Boot on aufs layered root file system
I would like to have a root file system composed of several aufs branches mounted on /.
My Linux is a custom one created using buildroot and deployed on a board with a SAMA5D2 processor.
The mmc of ...
1
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0answers
38 views
Switch root filesystem after copy
I currently have a script that copy the content of a microSD card to the eMMC of a BeagleBone Black. Once the copy is done, I would like to switch root filesystem for the eMMC and finish installing ...
1
vote
2answers
1k views
How does linux know where the rootfs is?
I'm trying to understand how the linux kernel knows where the desired rootfs is on boot.
I read this document:
https://www.kernel.org/doc/Documentation/filesystems/ramfs-rootfs-initramfs.txt
One ...
56
votes
1answer
3k views
Change permisions of a file with my cat's help
root@system:~# less myfile
-bash: /bin/less: Input/output error
The root filesystem is dead. But my cat is still alive (in my memory):
root@system:~# cat > /tmp/somefile
C^d
root@system:~#
He's ...
3
votes
1answer
284 views
How do you completely switch the root files system on Linux?
I am running my rootfs on a flash device (MTD device with UBIFS) - Note: it's a bitbake system so its not full-blown ubuntu or anything.
I want to be able to format that device and write a new rootfs ...
2
votes
2answers
147 views
Replace LUKS partition with ext4 partition with same contents
I have a LUKS (Linux Unified Key Setup) partition that contains the rootfs. I wish to replace it with an unencrypted ext4 partition containing the same rootfs. Having searched far and wide I've seen ...
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227 views
[dpkg: error: failed to open package info file /var/lib/dpkg/updates/0049 for reading: Input/output error]
I am trying to install qt4 dev. tools on bananapi. During installation half of the way, I got this error message:
dpkg was interrupted, you must manually run 'sudo dpkg --configure -a'to correct the ...
0
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2answers
92 views
Where should I put my source code? [duplicate]
I am using multiple tools developed by the suckless people which are not configured via a config file but via their source code (in this case C) and then simply installed through make install. So I am ...
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0answers
214 views
can't build busybox with musl [closed]
I tried a lot of different configurations with musl and busybox but i can't get it to work. Starting out i though that busybox would build /bin /usr /sbin and musl would give me /lib and magically ...
1
vote
1answer
352 views
Adding ZFS to a Preseeded Debian Installer
I'm looking to create an (internal, for legal reasons) preseeded debian (stretch) installer that will automatically create a root zpool from all available HDs instead of going through (whether ...
0
votes
1answer
39 views
Is it possible/practical to use a Linux server to authenticate Windows devices?
I am from a small concern and we are currently looking into getting a server purely for authentication and saving user data's. I do not want to push software to the devices or anything like that. I ...
3
votes
2answers
404 views
Where does kernel define the SD card naming index?
I'm running an embedded board that is booted from an SDCard. The location of the rootfs gets passed to the kernel via kernel parameters:
Kernel command line: console=ttyS0,115200 root=/dev/mmcblk0p2 ...
0
votes
1answer
59 views
What makes debian different from other variants given they have same kernel? [closed]
In the recent project we have been asked to create a debain based system for a SOC. Doing some gooogling I did find guides that point to ways to use yocto to create a debian system [1]. But then I ...
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0answers
132 views
du command shows larger size than nand erase block size in ubifs. How to check the exact size in ubifs?
I use UBIFS for rootfs.
I would like to check the size of each direcotries in /.
When I checked with du command, it shows larger than mtd size.
Would you tell me the way how can I check the correct ...
1
vote
0answers
150 views
Kernel Panic unable to mount rootFS when booting without initrd [closed]
I am trying to boot a linux kernel(version 4.14.13+) without initrd support. I compiled most of the modules required for PCI, filesystem and chipset driver with the kernel. I still get the Kernel ...
2
votes
1answer
307 views
Diskless Ubuntu - manpages fail
I've set up diskless client, but man does not work:
man: error while loading shared libraries: libmandb-2.8.3.so: cannot open shared object file: Permission denied
Root is mounted like this (mount):...
0
votes
2answers
283 views
What are limitations chrooted system? [closed]
Chroot allows us to change the root directory, or rather root directory of specific process. Now obviously this does restrict the process to the specified tree (unless it doesn't relinquish the ...
0
votes
1answer
363 views
Read-only filesystem - Considerations and Loss of Functionality
I'm creating an embedded system using Buildroot. Currently, my Buildroot configuration ensures the rootfs is remounted as read/write during startup. However I would like to remove this feature and ...
4
votes
1answer
2k views
When can Linux boot with a Read-Only Root Filesystem
I am working on a embedded Linux with u-boot as bootloader and systemd init system. The tools are limited to standard busybox.
While analyzing some problems, I figured out the root filesystem is read ...
0
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0answers
233 views
setcap settings do not reflect in getcap
root@localhost:~# setcap cap_net_raw+p /bin/ping
root@localhost:~# getcap /bin/ping
root@localhost:~# ls -l $(which ping)
-rwsr-xr-x. 1 root root 34752 Nov 8 2014 /bin/ping
root@localhost:~# ping ...
1
vote
2answers
82 views
Using a different directory than /usr as standard
Is there any possibility to use a different directory than /usr as the standard directory to install things? I am asking, since I got an Endless OS system where /usr is read-only, thus not being able ...
0
votes
1answer
238 views
I can't boot after add more space to /root ,
I think I do something wrong and made filesystem mess , please look that pic , I can't boot , it said emergency mode, please exit to the shell
And after I check the logs
It said my default.target ...
0
votes
1answer
3k views
root file system stays read-only
I am currently trying to start working with an embedded linux device (arm). When I am trying to install packages it fails saying that some /usr/... path points to a read-only filesystem.
By looking ...
0
votes
1answer
84 views
Copy a file via drag and drop to `/usr/local` [closed]
I have a file mathpass (without a file ending .*) in /home/patrick/Documents and want to copy it via drag and drop to /usr/local.
If I do so, a message Access denied. Could not write to. appears.
...
0
votes
1answer
39 views
Why is /boot empty on nfsboot nfs host, when files exist on booted client?
I am confused to say the least. Where are these files kept?
So, isc-dhcp server, providing network boot and tftp server records. A
tftp host providing an initrd and vmlinux image over pxelinux.0. An
...
1
vote
1answer
467 views
Updating root filesystem remotely in-place
Let's say one has only remote access (SSH) to an embedded Linux device and the goal is to upgrade the OS to a new version. The device has only one partition, but there's easily more than 50% unused ...
0
votes
1answer
47 views
How are Configuration Parameters 'written' on “Read Only” bootable Linux CD/USB, when plugged into any system?
I am trying to understand about the file system of bootable system on CD. For CDs which can only be written once, how exactly does system boot?
Aren't there any configuration parameters which need to ...
0
votes
1answer
123 views
Permission automatically resets to root after using chown
I've got a samba shared directory which previously was setup normally but I noticed not being able to connect to it anymore. Turns out that permissions were reset to root and whenever I try to change ...
0
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0answers
179 views
ACPI Volume Control (not brightness)
For some reason, upon upgrading to Ubuntu 16.04, my volume and brightness media controls are no longer registering as XF86 keys. I created an acpi event and action script for my screen brightness in /...
2
votes
2answers
2k views
Which filesystem should I use in an SD card on a NAS?
My NAS can hold several 3.5" hard drives and an SD card. I'm planning to boot and run a custom Linux system (based on Debian, built by me) from an SD card, and the 3.5" hard drives will be used for ...
1
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0answers
381 views
root partition on AIX is full i.e 100%usage [closed]
I have an AIX server and its root partition says 100% space used. There was only 2 GB initially allocated. I want to increase its size using chfs. I want to know is this is safe to increase the size ...
2
votes
1answer
971 views
Pass root file system by label to linux kernel
How can I boot the linux rootfs from u-boot passing rootfs partition by label ?
I'm using u-boot as bootloader and the card is a RedPitaya. The linux is a customized Linux based on the stable ubuntu ...
3
votes
2answers
2k views
Running QEMU with a root file system directory instead of disk image
In order to test the root file system i need to run QEMU with created disk image as root file system, the QEMU accepts -kernel which can be used for specifying kernel directly without deploying it ...
