Server Fault Stack Exchange
Server Fault Stack Exchange

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.

585 questions
0
votes
2 answers

How does GRE interface route packet to remote endpoint

I have the following topology which I configured to run a GRE tunnel between my Desktop and the wireless router. On the PC: ip link add l2gre0 type gretap remote 192.168.0.103 local 192.168.0.10 On the Router: ip link add l2gre0 type gretap remote…
Haswell
  • 113
  • 2
  • 8
0
votes
0 answers

Traffic Control - Searching clsact filters by parent ID

According to net, sched: add clsact qdisc you add filter on ingress and egress after adding clsact,e.g. ➜ tc qdisc add dev foo clsact ➜ tc qdisc show dev foo ➜ tc filter add dev foo ingress bpf da obj bar.o sec ingress ➜ tc filter add dev…
Maciek Leks
  • 121
  • 5
0
votes
0 answers

May I ask during runtime how to check the some kernel command line parameters which not set in the grub but have a default value?

I notice there are some kernel command line parameters like below, which from Manual: audit= [KNL] Enable the audit sub-system Format: { "0" | "1" | "off" | "on" } 0 | off - kernel…
superpear
  • 1
0
votes
0 answers

How does the mlx5 driver use the IOVA generated by IOMMU as DMA address?

I have enabled IOMMU on the physical machine. I expect the RDMA NIC to use the IOVA allocated by the IOMMU module for DMA after enabling IOMMU. However, in reality, the RDMA NIC does not use the IOVA for DMA： enter image description here I found…
kuao
  • 1
0
votes
0 answers

How do I fix amdgpu and amdgpu-dkms packages not installing?

I'm trying to install the amdgpu package and it throws a bunch of errors: Reading package lists... Done Building dependency tree... Done Reading state information... Done The following packages were automatically installed and are no longer…
Mach
  • 1
0
votes
0 answers

Cannot boot on Arch Linux after modifying kernel parameters with GRUB

Looking for a way to set my backlights on my laptop running Arch Linux (and Windows on a dual boot), I edited the /etc/default/grub file to change a kernel parameter. Here is what I changed: # before edition #…
Romain T-BIGOT
  • 1
0
votes
1 answer

How to find the cause of a server kernel panic?

Our high-load server is in kernel panic. How can we identify the cause and correct it? It is a Dell PowerEdge R940 with 256GB ram and 20TB disk array with the root in a SSD disk. Linux CentOs 7 system. Trying to reboot I just can get the next two…
user2309000
  • 21
  • 5
0
votes
1 answer

Why do some servers have /etc/sysconfig/kernel and others do not?

I spent some time looking into this and couldn't figure out why there are servers with and without /etc/sysconfig/kernel. What's particularly interesting is that we have some servers with the same underlying architecture (kernel and OS) that have…
hfranco
  • 585
  • 2
  • 9
  • 25
0
votes
0 answers

Exceed routing limit of 255 on Debian (any Kernel version)

I want to setup more than 255 GRE tunnels between 1 server and about "6000 other servers/aka proxies", method used is: sudo ip tunnel add gre1 mode gre local 149.5.175.220 remote 5.182.37.41 ttl 255 sudo ip addr add 10.0.0.2/30 dev gre1 sudo echo…
AlbertBrenaman
  • 1
  • 1
0
votes
0 answers

changing queue parameter nr_request on NVMe dev

We would like to use NVMes (SAMSUNG MZ1LB1T9HALS-00007) as a cache-tier in a Ceph System (17.2.0). The problem is that the stored data has a lot of small files and if hot-tiering is set to ~70% on the NVMes many slow-ops show up. Therefore, we…
pawel_winzig
  • 101
  • 2
0
votes
0 answers

VMware Host only networks: Hosts not receiving NULL/FIN/XMAS packets using PFsense router

Setup: 2 host-only ints each connected to a separate host on a separate network PFsense VM routing between 2 networks (implicit accept on both networks, no other rules) Can receive normal, syn,syn/ack,rst/ack, ACK, etc, essentially all the normal…
Jack
  • 1
  • 1
0
votes
2 answers

Can a Linux web server which hasn't been restarted for years be secure?

The content of /proc/uptime reports: 48973211.37 1627573879.70 48973211 seconds mean the server is up for 567 days without a restart. Since then many serious security fixes have been applied to the Linux kernel. Because my server was never…
zomega
  • 51
  • 4
0
votes
2 answers

How to debug Linux server reboots?

I have a Debian 10 server that keeps rebooting. journalctl offers possibility to list last boots: journalctl --list-boots -6 1ee519dc5bc24e88af75cc609ee32093 Mon 2023-02-06 21:02:02 UTC—Sun 2023-02-12 17:23:28 UTC -5 bb25fc752ac1428abb87bab15a3cea8b…
Tombart
  • 2,143
  • 3
  • 27
  • 48
0
votes
0 answers

ICMP Echo requests initiated from an interface inside VRF don't get ICMP echo replies

I have this setup, which is basically a linux server with one physical interface connected to another device. On this physical interface there is 2 VLANs, 100 and 200. In VLAN100 there is an IP address x.x.x.0/31 configured and enslaved into VRF…
Mohamed Kamal
  • 1
0
votes
1 answer

Injected packets using libPCAP library is not seen from python socket sniffer and netcat

I am using libpcap to transmit packets between two VETH pairs {veth1, veth1peer} and {veth2, veth2peer} and using each others peer to inject packets upwards to veth1 or veth2 and disabled "rp-filter" and enabled "accept_local" feature. I have a…
Mazin Roushdy
  • 1
1 2 3
…
38 39