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Questions tagged [linux-kernel]

The Linux kernel is the operating system kernel used by the Linux family of Unix-like operating systems. It is one of the most prominent examples of free and open source software.

The Linux kernel is the operating system kernel used by the Linux family of Unix-like operating systems. It is one of the most prominent examples of free and open source software.

The Linux kernel is released under the GNU General Public License version 2 (GPLv2) (plus some firmware images with various non-free licenses[citation needed]), and is developed by contributors worldwide. Day-to-day development discussions take place on the Linux kernel mailing list.

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Understanding buff/cache and tmpfs relationship on a read only filesystem with no swap

We have a really strange bug where a Yocto operating system running on a Raspberry Pi will 'lock up' because of disk IO wait. Scenario: operating system runs read only and has no swap there is a tmpfs filesystem for stuff the OS needs to write to…
jakew009
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Google Cloud Platform - Ubuntu Pro - Quota format not supported in kernel

I cannot get quota to work on Fresh copy of Ubuntu Pro mount -o remount / quotacheck -avugm quotacheck: Scanning /dev/root [/] done quotacheck: Checked 19045 directories and 94713 files quotaon -avug quotaon: using //quota.group on…
Donno
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How do routing rules from IPTables, IPVS, and NFTables get ordered from a precedent perspective, in the Linux kernel?

The Linux kernel has the ability to route traffic using nftables, iptables, and ipvs. Ive collected 3 related questions here, in order to generally ask the broader overall question of how precedence is determined with regard to kernel routing and…
jayunit100
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Linux: How to setup dns server via dnsmasq and connect a second machine with it?

Setup: I have two vms running: prime and second. On the prime dnsmasq is installed. What I need to accomplish: Setting a second(machine) so it connects and looks for domain names on the dns server. (aka ping to custom domain from second to the…
Auryn Vansteenkiste
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Influence source address selection to same destination with multiple interfaces

I have a system with two network interfaces, both connecting to same default gateway. I want to load balance the connections to the same destination IP made from the system across both interfaces and use source IPs from each. I want this solution to…
TheJoker
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kernel BUG at ./include/linux/skbuff.h:4470 leads Server to Hang

Server with linux version 5.5.0-050500-generic and OS version Ubuntu 20.04 LTS I have two interface which are connected to ovs bridge. As per normal flow packets are redirected to one interfcae to another on the bridge while pinging from external…
aldin
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Erroneous inode values when disabling 64bit

Recently the NAS we use has been switched from 32bit to 64bit inodes on a nfs mount. Unfortunately we have legacy code which does not play nice with this. After some panicked googling I came across this article, which has been very…
Stripy42
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How to build kernel with OpenVZ support

Is it possible to compile 5.x kernel with OpenVZ? There is a full-blown custom OS built on top of RHEL6 called Virtuozzo 7.0, but it uses only 3.10 kernel. I would like to build any newer kernel, preferably 5.x, or at least one they developed at…
Possible
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75% CPU wait and apt upgrade hanging

Recently I observed a relatively constant 7/8 (core) load on one of my servers. Looking with top, seems that CPU is constantly 75% waiting: Tasks: 401 total, 1 running, 400 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.0 us, 0.0 sy, 0.0 ni, 25.0…
jazzman
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How to investigate TCP memory leak

We are running a medium size AWS EKS cluster (~120 kubelet nodes) running mostly Go services. The services deployed in the cluster are quite busy, handling millions of calls per hour. Each kubelet runs on the same version of the standard Amazon…
milosgajdos
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How do I get the Current time in milliSeconds in a Shell script in buildroot environment?

MYENV=$(date +"%s%N") printf "Time:: %s\n" "$MYENV" or MYENV1=$(date +"%T%N") printf "Time:: %s\n" "$MYENV1" I tried above methods, they do work in regular linux but not working in buildroot. 1606718041%N is the output being printed. What does…
Pranay Gupta
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Is BBR congestion control available on my host or not

I have been looking into enabling bbr congestion control on some of our servers to test if they make any difference for our workloads. We are on Amazon Linux 2: # uname -a Linux ip-10-1-66-180.us-east-1.aws.dckr.io 4.14.173-137.229.amzn2.x86_64 #1…
milosgajdos
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How to build kernel-debuginfo from upstream kernel

box: centos7.5 x86_64 from upstream: tar xvfz linux-4.xx.xx make menuconfig ( set CONFIG_DEBUG_INFO=y) save .config make rpm-pkg output 3 rpm:kernel-xxx, kernel-devel-xxx, src.rpm but where is debuginfo and debuginfo-common rpm packages? How to…
CVN004
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How to configure linux routing to enable load balance between two interfaces?

I have these interfaces on my linux machine : eth0, vti1 and vti2. vti1 and vti2 were added after I configured libreswan IPSec. Now I want to distribute traffic through both these interfaces equally. How can I configure linux routing to achieve…
himanshu
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Enabling NUMA node in VM player custom Linux guest OS

I am trying to run DPDK helloworld example in a custom Linux distribution. I have installed custom Linux in a VMware player. The program is failed due to the fact the NUMA node is not supported. When I try to execute grep NUMA /boot/config-uname…
vijay
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