Last call to make your voice heard! Our 2022 Developer Survey closes in less than a week. Take survey.

Questions tagged [kernel]

In computing, the kernel is the main component of most computer operating systems; it is a bridge between applications and the actual data processing done at the hardware level. The kernel's responsibilities include managing the system's resources (the communication between hardware and software components).

Filter by
Sorted by
Tagged with
0 votes
0 answers
19 views

GNU Linux Debian 11 (should work for Ubuntu too) - compiling latest kernel (Linux/x86 5.17.7) - results in Volume group "name-vg" not found

Dear internet & users & robots & AIs & other entities with access to digital, one fine day... decided to compile the latest currently available kernel under Debian 11. last time did ...
user avatar
0 votes
0 answers
17 views

kernel parameter - net.core.netdev_max_backlog , what happened when its too low

we want to understand what are the aspects when net.core.netdev_max_backlog kernel value is very low and not as recommended on our Linux RHEL machines , the value for this parameter is 1000 since our ...
user avatar
0 votes
2 answers
121 views

what's root cause of "A start job is running for Create Volatile Files and Directories"

Stuck at "A start job is running for Create Volatile Files and Directories" after reboot a server(Debian 9.5, 64bit), and solve by this "boot-stuck-at-a-start-job-is-running-for-create-...
user avatar
0 votes
1 answer
104 views

How to cleanup /usr/lib/modules and /usr/lib/x86_64-linux-gnu?

I executed the command apt autoremove but those folders persist. As the command "du -h -x --max-depth=1 /usr/lib | sort -hr | head -n 10" showed me, they are currently using almost 1G each: ...
user avatar
0 votes
0 answers
185 views

Stuck on "update-initramfs: Generating /boot/initrd.img-5.4.0-92-generic"

I have a problem with uninstalling packages on my server(20.04 LTS). When I run apt remove metricbeat receive this message: root@elk:/home/elk# apt remove metricbeat Reading package lists... Done ...
user avatar
0 votes
0 answers
30 views

Unable to get kernel log messages written to a specific log file on syslog server

I have a working rsyslog setup with CentOS as my server and I am using Kali as the client. I am able to use logger on Kali to send test log messages and see the log messages appear in the CentOS ...
user avatar
0 votes
1 answer
59 views

Debian kernel upgrade issue

I was checking my Debian 11 bullseye kernel if i have fix for Dirty Pipe vulnerability. Seems that kernel version 5.10.102 has the fix for that. Problem is that i cannot get upgrade for that kernel ...
user avatar
0 votes
1 answer
94 views

Debian: Kernel update using APT - reboot required to take effect?

Suppose I update the kernel of a running Debian system using apt-get upgrade linux-image-amd64 to a higher minor version number (e.g., 5.10.10 to 5.10.11). Do I have to reboot the Debian server in ...
user avatar
  • 4,957
0 votes
1 answer
47 views

only flush the write cache if there's no read activity

Normally the Linux Kernel flushes the write cache if a specified time limit is exeeded or the cache is full. This leads to stalling with HDDs since the writing process makes reading processes much ...
user avatar
  • 13
0 votes
0 answers
45 views

Server experiencing Kernel-Power Event 41, but only once every two weeks

I go to check on a client's servers once every two weeks as part of an IT contract. For the past month and a half, their secondary server will experience a sudden shutdown and generate the Critical ...
user avatar
  • 1
-1 votes
1 answer
72 views

How can I get my CPU to run at maximum speed by circumventing CPU scaling? [closed]

I am running CentOS 7 (7.9.2009) (kernel 3.10.0-1160.49.1.el7.x86_64) on a rather old laptop (Lenove T61) with a dual core CPU (Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz). The driver for CPU scaling ...
user avatar
  • 1
0 votes
0 answers
48 views

why bind mount(shared mode) doesn't work for fuse client?

Create juicefs Network mount(like NFS mount) in host machine juicefs mount -d redis://10.111.100.91:6379/0 /mnt/jfs-mount 2021/12/10 20:05:25.914969 juicefs[33027] <INFO>: Meta address: redis://...
user avatar
  • 113
1 vote
0 answers
79 views

what are the kernel messages about "Disabling DIF Type 2 protection" means

On our RHEL 7.2 server we saw a strange kernel messages with lines as: Disabling DIF Type 2 protection ***10DIGITS*** 512-byte logical blocks: (2.00 TB/1.81 TiB) Above messages are relevant for all ...
user avatar
4 votes
1 answer
2k views

Can't run docker-container 'failed to create endpoint frosty_varahamihira on network bridge'

When I try to run the hello-world docker image I get the following error: ubuntu@ubuntu:~$ sudo docker run hello-world docker: Error response from daemon: failed to create endpoint frosty_varahamihira ...
user avatar
1 vote
0 answers
61 views

needrestart keeps asking for rebooting on new kernel

I have removed obsolete kernel after new kernel was installed. Now I keep getting following message from needrestart over and over again: The currently running kernel version is 4.9.0-16-amd64 and ...
user avatar
0 votes
1 answer
134 views

No /dev/dri after upgrading to 21.04

Recently upgraded from 20.04 to 21.04, which installed kernel 5.11. Now it fails to start X with correct screen dimensions, due I assume to this in Xorg log: [ 23.307] (EE) open /dev/dri/card0: No ...
user avatar
  • 23
0 votes
1 answer
51 views

Is it possible to route packets using iptables only without enabling ipforwarding?

I'm wondering if it is possible to do routing using iptables only, without using ip_forwarding flag in kernel.
user avatar
0 votes
0 answers
234 views

How to increase the block size of an ext4 filesystem beyond the 4KB limit?

Is there a way I can increase the blocksize of my filesystem (ext4) beyond the 4KB limit? I want to increase the random read/write speed of my filesystem by increasing the block size but I can't go ...
user avatar
2 votes
0 answers
249 views

Changing your kernel in AWS appears to break boot sequence (grub config issue?)

Using Ubuntu 20.04 on AWS (ec2), I wanted to change my kernel from AWS to a generic one. When I try it the suggested way with changing the Grub Config, it stops the machine. This is because Jibri (...
user avatar
2 votes
2 answers
518 views

NFS4 + Kerberos does not work since 5.10 kernel

Since I updated to Debian Bullseye, nfs clients stopped working: # mount -vvt nfs4 -o sec=krb5 nfs11:/srv /mnt mount.nfs4: timeout set for Wed Sep 15 20:25:49 2021 mount.nfs4: trying text-based ...
user avatar
  • 298
1 vote
1 answer
488 views

Upgrading to debian 11 (from debian 10) not add the kernel in /boot/ (Dedibox Server)

I have make upgrade on my server and reboot the server to use the last kernel, but after reboot, the server just use the old kernel (4.19.0-16-amd64). In /boot/, I just seen files for kernel 4.19.0-16-...
user avatar
3 votes
2 answers
489 views

Tune Linux & Nignx to handle 10k Connections @10Gbps Server

I just got a new 10Gbps server with 8 CPU Cores, 64GB RAM and 1TB NVMe OS Centos 7.9 kernel 3.10.0-1160.36.2.el7.x86_64 also tried kernel-ml 5.13 SELinux is disabled. firewalld and irqbalance stopped ...
user avatar
  • 31
0 votes
0 answers
25 views

bpftrace: Trying to get IP's and ports on tcp_cleanup_rbuf()

I've hooked tcp_cleanup_rbuf() and I'm trying to get the IP and port information out of the skb queue. But it seems to be empty. Is that correct? Has it already been free'd at that point? Here is a ...
user avatar
0 votes
0 answers
127 views

Why does booting in debian freeze at /dev/sda1: clean

I need a new debian kernel to activate a module available only on version 5.13 and more. So I found a tutorial to configure, build and install it. After rebooting the computer and selecting through ...
user avatar
  • 59
0 votes
0 answers
86 views

rsyslog seems to be triggering sdhci dumps when writing in external storage

Acording what I read, rsyslog is usually used to process logs and send them to another locations, either local (external storage, specific partition, etc.) or remote (logging server, for example). ...
user avatar
3 votes
1 answer
599 views

Setting CPU frequency to hardware minimum limit - will it harm the hardware?

I'm running on a Intel Celeron N4120. I can easily set the CPU governor for all 4 cores to powersave using: for n in {0..3} do sudo cpufreq-set -g powersave -c $n done Now, using cpufreq-info I ...
user avatar
  • 33
0 votes
1 answer
108 views

Adding kernel config option to Ubuntu Server installation .iso

Is it possible to change the installation files in the .iso live image of Ubuntu Server, to add a certain kernel configuration option? My goal is to enable CONFIG_DMA_CMA, so the kernel is compiled ...
user avatar
  • 3
0 votes
0 answers
55 views

Lots's of ` kernel: [ ] output chain dropped: IN= OUT=enp0s31f6 ` in `/var/log/messages`

I already disble ipv6 in mypc debian 10 system,firewall is nftable. When I check /var/log/messages,lots of kernel: [ ] output chain dropped as below: Jul 13 11:03:14 mypc kernel: [ 8206.745775] ...
user avatar
  • 825
0 votes
1 answer
104 views

OpenVZ 7 memory leak

Looking for some assistance on a memory leak issue wherein the RAM consumption keeps gradually increasing day by day and within a span of 6 to 7 days, it reaches 100%. (I have to reboot then). Ram ...
user avatar
0 votes
1 answer
46 views

How to LTS for new Ubuntu users?

Hi I have some servers with not too terribly demanding requirements other than uptime. I'm new to Ubuntu, having just left CentOS after ten glorious years and many more prior to that. 20.04 LTS seemed ...
user avatar
0 votes
0 answers
51 views

Centos 8 CLI failed to start Switch root . “failed initrd-switch-root.service” [exit code]

I have Centos 8 Cli version installed , due to power off the OS starts directly in emergency mode without starting root user . I have attached screenshot here The OS is on VMware Hypervisor esxi 6.5 ...
user avatar
2 votes
0 answers
148 views

How to find out which kernel module opened a socket?

When I try to find the process for an opened socket using e.g. ss I get the following output: ❯ sudo ss -tulpen Failed to open cgroup2 by ID Failed to open cgroup2 by ID Netid State Recv-Q Send-Q ...
user avatar
  • 121
1 vote
1 answer
44 views

Incorrect # of Hugepages in `numstat`

I asked a similar question years ago. Now, my machine has four 1G hugepages and 256 2MB hugepages: # cat /sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages 4 # cat /sys/devices/...
user avatar
  • 235
1 vote
1 answer
1k views

ixgbe eth0: initiating reset due to tx timeout and ixgbe eth0: Reset adapter

Server interfaces are flapping sometimes. It happens randomly. We are getting below logs in dmesg and similar logs are being captured in syslog as well. OS: OS-Debian GNU/Linux 9 (stretch) 4.9.0-12-...
user avatar
0 votes
1 answer
160 views

Ubuntu /boot full

On an old server that still runs Ubuntu 16.04 the /boot partition is full, not with old kernels but with kernels that are all newer than the one that is running. I'm running 4.4.0-176-generic, and the ...
user avatar
  • 21
9 votes
4 answers
5k views

kube-proxy won't start in Minikube because of permission denied issue with /proc/sys/net/netfilter/nf_conntrack_max

After updating Arch Linux (sudo pacman -Syu) and restarting the system, Minikube fails to start because of kube-proxy. The logs show it was trying to modify /proc/sys/net/netfilter/nf_conntrack_max ...
user avatar
  • 211
0 votes
2 answers
65 views

OpenBSD NIC Cards Not Configured (Kernel Edit)

I have recently installed OpenBSD v6.8 on a SuperMicro server. During the initial installation I couldn't setup the NIC cards because I didn't have any IP Information. I assume this setup skip caused ...
user avatar
  • 1
1 vote
1 answer
60 views

Forcing `mount` to bypass nfs kernel limitations in relation to the nfs version

According to this answer https://serverfault.com/a/1062570/253400 there's the possibility that the installed software supports nfs version v4.2 but if the underlying kernel is not prepared, the mount ...
user avatar
0 votes
0 answers
90 views

Glusterfs: rpc actor failed to complete successfully

I have glusterfs service running over CentOS 6, an I can see those errors filling up the logs continuously: [2021-03-09 07:13:52.692995] E [rpcsvc.c:450:rpcsvc_check_and_reply_error] 0-rpcsvc: rpc ...
user avatar
  • 107
1 vote
1 answer
68 views

How can I best get the mpt2 drivers back in to Centos8 [for maas images and openstack ironic/image builder]

I need the mpt2sas drivers to get Centos8 to work with my servers. Thanks to them using the rhel nutered kernel the device id's have been removed and wont load with out using a dd disk. I have both ...
user avatar
  • 283
0 votes
0 answers
68 views

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, ...
user avatar
1 vote
1 answer
617 views

Is there a list of linux compatible RAID/HBA cards?

I purchased an LSI Logic HW RAID controller on ebay without doing much research and discovered the hell of 10-year old proprietary drivers and command line tools with no documentation. I'd like to ...
user avatar
0 votes
0 answers
72 views

general protection error stopping my prod container

I started having a general protection in the last days which results in my container restarting, thus, disrupting the service, whenever the general protection error happens, i can see in the ...
user avatar
  • 99
0 votes
0 answers
39 views

dmesg -T + how to expand dmesg info in order to verify history details

we have rhel 7.2 server from dmesg -T we see only the current date - Mon Jan 11 and not history dates as jan 10 , or less then jan 10 dmesg -T [Mon Jan 11 12:02:53 2021] Initializing cgroup subsys ...
user avatar
1 vote
0 answers
24 views

Bringing interface up without a cable (but bridged VMs)

I've set up a bridged network vm (i.e. virtual network hub, vm:192.168.1.2, host real network card: 192.168.1.1) There's no network cable. As I do not care for one on this host->vm setup. The vm ...
user avatar
  • 213
4 votes
1 answer
5k views

How to get the latest kernel package on AWS EC2

I manage some EC2 instances running Amazon Linux (not sure what version), which need security patches. A lot of software was patched well, but we have stuck on the kernel upgrade. We are unable to use ...
user avatar
1 vote
0 answers
160 views

Same sysctl kernel parameters for KVM host and guest

I need to set up a KVM guest with the following sysctl kernel parameters: net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 ...
user avatar
0 votes
1 answer
919 views

NFS fails to resolve hostname

I'm trying to create an NFS docker volume, however I'm unable to do so by hostname. I'm creating the volume with: sudo docker volume create --name foo_bar --driver local \ --opt type=nfs4 \ --opt ...
user avatar
2 votes
1 answer
271 views

In Debian-based script: how to determine if kernel changed and needs reboot?

How can we (more) easily determine if a kernel-change-reboot is required in Debian, other than doing this in a script (which is a bit cumbersome)? Ubuntu has /var/run/reboot-required and per our ...
user avatar
0 votes
0 answers
100 views

Ubuntu 18.04 upgrade does not find latest kernel

I have an 18.04 host,A, currently running the 4.15.0-124-generic kernel. The latest is 4.15.0-126-generic. host A had holds on linux-generic, linux-headers-generic, linux-image-generic so the kernel ...
user avatar

1
2 3 4 5
17