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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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Commands to Upgrade Kernel on CentOS 7

My current kernel is 3.10.0-957.1.3.el7.x86_64. I got to know about this by using the command uname -r. Now I want to upgrade my kernel version to 3.10.0-1062.12.1.el7.x86_64. I used the below blog to upgrade my…
Subramanian Lakshmanan
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Nearly 100% disk utilization after upgrading to debian 10 without any reason

We recently upgraded our servers to debian 10. The setup is completely the same as with debian9 beside of course some new software packages. We are running the default kernel: $ uname -a Linux kt105 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u2…
Janning
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df -kh command in linux is showing 100% storage but df -i showing 18% storage why it is happening?

Output of df -kh [root@mavdu ~]# df -kh Filesystem Size Used Avail Use% Mounted on /dev/sda1 2.9G 2.9G 0 100% / devtmpfs 5.7G 0 5.7G 0% /dev tmpfs 7.7G 0 7.7G 0% /dev/shm tmpfs 7.7G 26M …
Ravi Patidar
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AMD Geode LX linux : how to instruct driver to enable flat panel?

Platform : PC/104 with AMD Geode LX CPU with integrated graphics. Buildroot framework, kernel 4.18.10. I am building a custom Linux system with Buildroot. Since I compiled the Geode LX frame buffer driver in the kernel (lxfb), I get a black screen…
dpeng
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How to enable IBRS when it is disabled?

I have been updating some servers to the latest patchlevels and wanted to check the security state regarding Meltdown, Spectre and Spectre-NG. Using the current V 0.39+ of the spectre-meltdown-checker I was astonished about my findings in a VM…
Nils
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When someone gains remote access to a server are there other ways to execute system commands other than the bash shell?

I am hardening a server and attempting to build a restrictive layer to a potential hacker even with root access to the server to do harm. If a user gains root or user access to the shell via say ssh, is there any other way for a user to access…
I'm Root James
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Diagnose Sudden Slowness on Linux

I have two identical Linux laptops (Core™ i7-4810MQ with 32GB RAM) both running Ubuntu 16.04. Running seemingly any command on machine 2 takes about 4-12 times as long as on machine 1, depending on the activity. This was noticed late last week while…
chadsgilbert
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Linux kernel build - dont change vmlinuz

When building an upstream kernel, /boot/vmlinuz and /boot/System.Map are updated to point at the newly installed kernel image. Is it possible to disable this behavior, perhaps by changing a config or Makefile parameter? I'm building the kernel like…
David Farrell
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Better stream performance when transparent hugepages are on

On rhel 7, when transparent hugepages are activated, I get a better stream benchmark performance than when transparent hugepages are off. Do you have any idea of a kernel parameter (or another thing) which could trigger this behavior ? I was…
user380763
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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…
KMG
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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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