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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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Memory Hotplug in Linux is supported?

Does someone know, if the underlying hardware supports memory hotplug, in Linux is supported without reboot? Especially in Centos 6.x(x86_64). Thanks
etcshad0vv
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Centos iptables: No chain/target/match by that name

I had a CentOS6.7 with OpenVZ. Now, I just uninstalled OpenVZ and start using Plain CentOS6.7. Due to some difficulties for using cPanel in OpenVZ. I noticed one problem when install csf in my plain server. Error: iptables: No chain/target/match…
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CentOS 5.10 TCP Sequence Number

We have done a security check on a server and its come back with Linux Kernel TCP Sequence Number Generation Security Weakness. We are looking to correct this being flagged up on the check We are using CentOS 5.10 with kernel 2.6.18-371.9.1.el5
toza
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esxi 5 VMKernel and linux driver compatability mode

Many peoples around the web say, the esxi 5 kernel isn't based on linux kernel, but in the same times they say "ESX(i) includes a Linux driver compatability mode (drivers still have to be compiled specifically for ESXi)", so my simple question is,…
c4f4t0r
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How to check/set linux’s "security level"?

I got recommended here to check the kernel's security level—how can I print it out on a linux machine? (SLES?) If it’s set too low, how can I increase it? If I set it too high, can I ever set it back? How? Do you see a scenario where it makes sense…
Matthias Ronge
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RHEL4 - 2.6.9-55 TO UPDATE 8

I am having clearcase 7.0.1 application running on RHEL 4.0 (Paid & Unregistered)with the kernel version 2.6.9-55. When we ask the support redhat they said its not possiable because its not registered. As the patch of the clearcase need to be…
Sabeesh Thomas
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patch lists for Redhat linux 5.9 -64 bit

Can any one update the lists of kernel patches released for Linux 5.9 Redhat and what is the current patch level. Thanks Mohan
skmohan
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How to enable CONFIG_PREEMPT option in Linux kernel?

I am a new bee in Linux kernel programming, trying to work with an old kernel Linux 2.6.32 on x86_64. I want to enable the CONFIG_PREEMPT option in it but can not find information about how can I do it. I can compile a new kernel with my preferred…
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Where is the Linux source kept in a Rackspace Gentoo VPS?

I'm emerging udev and it complains it couldn't find the kernel sources under /usr/src/linux (there's nothing inside /usr/src/ indeed). As a result, it tries to take the version from the currently running kernel and messes up thinking it's an older…
agentofuser
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modprobe: FATAL: Module nf_conntrack_ipv4 not found in directory

TASK [kubernetes/node : Modprobe nf_conntrack_ipv4] ************************************************************************************* fatal: [node1]: FAILED! => {"changed": false, "msg": "modprobe: FATAL: Module nf_conntrack_ipv4 not found in…
VRK-TECH
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Connectivity issues with 127.x.x.x series

Asked this in network-engineering in stack exchange and was redirected here. I have a couple of servers with the below config server1: eno1: 127.15.0.1/16 scope global eno2: 5.0.0.1/24 server2: lo: 127.0.0.1/16 (it had /8. I changed the subnet mask…
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How to gather in a save, cheap and easy way high quality entropy on a Linux machine?

When no radioactive decay is available and good entropy is strongly advised for security reasons you experience a real problem. HTTPS connections consume a lot of entropy. If you have thousands of them per hour between machines low on good entropy…
Andreas Karatassios-Peios
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fsck -n /dev/nandb giving errors . how to solve fsck errors

I want to know how to solve this error? help me out!! INPUT "fsck -n /dev/nandb" OUTPUT fsck from util-linux 2.25.2 e2fsck 1.42.12 (29-Aug-2014) Warning! /dev/nandb is mounted. /dev/nandb contains a file system with errors, check forced. Pass 1:…
niranjan pawar
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How do you run a script when a kernel oops occurs?

I would like to run a custom script when a kernel oops occurs. Is this possible, and if so how?
Mark Raymond
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For php webserver, what is faster, 1x 24-core server or 3x 8-core servers?

Pricing at Dell, it seems I can either get a single R430 or 3x R220's. The R220's would have 4C/8T processors, giving 24 threads. The R430 would have 2x 6C/12T processors giving again 24 threads. For an CentOS 6 apache web server doing mostly…
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