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90 votes
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Would an executable need an OS kernel to run?

As someone who has written programs that execute without an OS, I offer a definitive answer. Would an executable need an OS kernel to run? That depends on how that program was written and built. ...
sawdust's user avatar
  • 17.9k
58 votes

Allow non-root process to bind to port 80 and 443?

I have a rather different approach. I wanted to use port 80 for a node.js server. I was unable to do it since Node.js was installed for a non-sudo user. I tried to use symlinks, but it didn't work for ...
noob's user avatar
  • 1,335
46 votes

How can I update the kernel in WSL2 kernel to latest release?

There are currently at least three ways to upgrade your WSL2 kernel: For recent Windows versions (Windows 10 21H2 and Windows 11), wsl --update is typically the best option, but realize that there is ...
NotTheDr01ds's user avatar
  • 23.2k
42 votes

Allow non-root process to bind to port 80 and 443?

Simplest solution : remove all privileged ports on linux Works on ubuntu/debian : #save configuration permanently echo 'net.ipv4.ip_unprivileged_port_start=0' > /etc/sysctl.d/50-unprivileged-...
soleuu's user avatar
  • 529
40 votes

Would an executable need an OS kernel to run?

The kernel is "just" more code. It's just that that code is a layer that lives between the lowest parts of your system and the actual hardware. All of it runs directly on the CPU, you just transition ...
Mokubai's user avatar
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33 votes

How to fix and prevent VirtualBox Kernel driver not installed

I met the same issue after VirtualBox upgrade to 5.2.6 r120293 Linux kernel version 4.14.13-041413-generic The following commands sequence helped for me: $ sudo apt install --reinstall virtualbox-...
Kirill Feoktistov's user avatar
26 votes

Obtain kernel config from currently running Linux system?

Regardless of the distribution, you can run: cat /lib/modules/$(uname -r)/build/.config Source: proc(5) man page (search for /proc/config.gz).
jgomo3's user avatar
  • 530
22 votes
Accepted

Which Linux kernel do I have in WSL?

While WSL2 is the default for new distributions that you install, it appears that your Ubuntu distribution was originally installed as WSL1. You can confirm this with: wsl.exe -l -v When running ...
NotTheDr01ds's user avatar
  • 23.2k
21 votes

Would an executable need an OS kernel to run?

It depends on the environment. In many older (and simpler!) computers, such as the IBM 1401, the answer would be "no". Your compiler and linker emitted a standalone "binary" that ran without any ...
Jamie Hanrahan's user avatar
20 votes

How can I update the kernel in WSL2 kernel to latest release?

For those, who can't update WSL kernel with wsl --update due to strict user update policy in their company, they can install a WSL-kernel manually. Read this Download the latest kernel from here: ...
Jura Herber's user avatar
18 votes

Problems with mounting HFS+ drives

For anyone else stumbling upon this question while looking for the same error message, note that there is another possible cause for this error. While the answer provided by mcy should work if the ...
lgpasquale's user avatar
17 votes

Guest additionals: Kernel headers not found for target kernel

On my CentOS 6 VM, the kernel development package was not installed, so I had to do: yum install kernel-devel This, however, created a mismatch between the kernel development version (2.6.32-754.31.1....
Kevin's user avatar
  • 275
15 votes
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How do I list my devices in GRUB?

There is your howto: https://www.linux.com/learn/how-rescue-non-booting-grub-2-Linux or here: https://askubuntu.com/questions/38082/how-do-i-manually-boot-from-the-grub-prompt-after-do-release-...
Jaroslav Kucera's user avatar
12 votes
Accepted

No OpenSSL sign-file signing_key.pem leads to error while loading kernel modules

In your linux kernel root folder that you're compiling go to the certs folder and run: openssl req -new -nodes -utf8 -sha512 -days 36500 -batch -x509 -config x509.genkey -outform DER -out signing_key....
Demon's user avatar
  • 236
11 votes

Obtain kernel config from currently running Linux system?

If you couldn't find kernel configuration in /boot/ nor in /proc/config.gz, you can try extracting this information from the kernel itself. Inside any kernel source code there is a script for ...
Ramast's user avatar
  • 211
11 votes
Accepted

How do I disable kernel logging into the systemd journal?

Good Linux/Sysadmin practice would recommend you go with something like fzbd's solution in which you're silencing the specific log you don't need to see rather than disabling kernel messages wholesale....
baelx's user avatar
  • 2,996
11 votes

How do I increase the max open files in macOS Big Sur?

/etc/sysctl.conf is no longer supported with Big Sur. To make persistent changes systctl can be issued on boot time using a launch daemon in /Library/LaunchDaemons/com.startup.sysctl.plist <?xml ...
Gerrit Griebel's user avatar
10 votes

How to save or export a custom Linux kernel configuration?

One option is: make savedefconfig which will create a file named defconfig in your current directory. You can now copy this file to arch/<architecture>/configs/my_defconfig (take care that the ...
gardarh's user avatar
  • 201
10 votes

CentOS yum -- pre-existing rpmdb issues

Root Cause Interruption in the up2date or yum update process caused the installation of multiple versions of the same package. Resolution If the system is Red Hat Enterprise Linux 5 or later, the ...
ramazan polat's user avatar
10 votes

How do I list my devices in GRUB?

The grub ls -l command will show all devices and partitions with their UUID-s. thanks to
gregn3's user avatar
  • 336
10 votes

How to fix and prevent VirtualBox Kernel driver not installed

$ sudo apt install --reinstall virtualbox-dkms && sudo apt install libelf-dev just this solved the same problem on my Kubuntu 18.4.2
Asklep's user avatar
  • 147
10 votes

Would an executable need an OS kernel to run?

I think many answers misunderstand the question, which boils down to this: A compiler outputs machine code. Is this machine code executed directly by a CPU, or is it "interpreted" by the kernel? ...
Artelius's user avatar
  • 1,226
9 votes
Accepted

How do I configure fsnotify's queue size/watch limit on OSX?

For anybody still wanting to do this, I ran this in Terminal in latest Mojave: sudo sysctl -w kern.maxfiles=524288 This change was related to Webpack not catching changes. My original limit was ...
Anriëtte Myburgh's user avatar
9 votes
Accepted

How to control CPU Usage of ntoskrnl.exe!MiWalkPageTablesRecursively

The quick answer: Give that routine less work to do. Which I think means either use less virtual address space at one time, or add more RAM. Details: First, the routine you're seeing, ...
Jamie Hanrahan's user avatar
8 votes

Compiling the Linux kernel, how much size is needed?

On my recent AMD64 build of 4.4.0-57 on Ubuntu 16.04, I needed about 14.5 GB of space for the build outputs. That seems a a lot and it seems that is mostly transiently needed files (e.g., .o files ...
BeeOnRope's user avatar
  • 1,069
8 votes

IPTables module ip_tables not found for root

TL;DR Update your kernel: sudo pacman -S linux Update your bootloader: bootctl --path=/boot install Reboot This morning I ran into this same problem when trying to configure iptables: [root@office-...
Matt Conway's user avatar
8 votes
Accepted

Reading version from vmlinuz using file command

Initial note My file -bL /vmlinuz returns: Linux kernel x86 boot executable bzImage, version 3.2.0-4-amd64 ([email protected]) #1 SMP Debian 3., RO-rootFS, swap_dev 0x2, Normal VGA ...
Kamil Maciorowski's user avatar
8 votes

How do I increase the max open files in macOS Big Sur?

I have used the following technique with success on Big Sur v11.6 So it seems that there are multiple settings at play here. The numbers returned by ulimit -Sn and ulimit -Hn for soft and hard per ...
PiersyP's user avatar
  • 263
8 votes

Which Linux kernel do I have in WSL?

While the default WSL version is set to 2, the WSL distribution you are running is WSL 1. It does not use a Linux kernel at all. WSL 1 (Windows 10): $ uname -a Linux db-d-18 4.4.0-19041-Microsoft #...
Daniel B's user avatar
  • 63.7k

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