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
0answers
7 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 ...
-1
votes
0answers
18 views

Kernel patching prompts “Reversed (or previously applied) patch detected! Assume -R? [n]”

I am trying kernel patching for the first time. I am not sure the following is encountered with an error and if I am doing it correctly. But in all tutorials and videos shows, .patch extension files, ...
1
vote
1answer
22 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 ...
0
votes
0answers
58 views

enough free pages but high number of major page faults and page reclaimation

We find that for some servers io disk read is very high. We also notice that there are many major page faults on those servers. But we checked the /proc/zoneinfo, there are enough free pages. Here is ...
0
votes
0answers
20 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 ...
1
vote
1answer
21 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 ...
0
votes
0answers
25 views

rhel + how to disable CPU's on my machine

We have physical Linux machine with 16 cpus lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 16 We want to disable ...
0
votes
0answers
20 views

Modify a Ubuntu dkms file to Debian

Hi I was trying to install this kernel patch HP p410i. https://medium.com/@terryjx/enable-it-mode-on-hp-smart-array-p410i-raid-card-on-hp-dl380-gen7-servers-4e827eeb78ca On following this guide I was ...
0
votes
0answers
11 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, ...
0
votes
0answers
101 views

Why does install of nfs-kernel-server fail _AFTER_ an apt update && apt upgrade that includes a kernel upgrade?

Problem statement: Installation of nfs-kernel-server fails at service startup if done right AFTER an apt update && apt upgrade step that also includes a kernel update. I was trying to install ...
1
vote
1answer
88 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 ...
0
votes
0answers
23 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 ...
0
votes
0answers
28 views

unable to disable secure boot option in ubuntu 14

I have ubuntu 16 with kernel "4.15.0-96-generic" and "HP 406 G1 MT" machine. I am trying to install VirtualBox 5.0. and it is failing while installing the VirtualBox kernel module ...
0
votes
0answers
20 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 ...
1
vote
0answers
20 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 ...
3
votes
1answer
429 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 ...
0
votes
0answers
61 views

What is the cause of this system reboot?

I experience random system reboots on a Debian 10 machine. It seems to be about SATA connection and/or an SSD drive. The attached drive (one of the two) that comes up in logs is a 256GB Silicon Power ...
2
votes
0answers
66 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 ...
-1
votes
1answer
195 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 ...
1
vote
1answer
103 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 ...
0
votes
0answers
61 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 ...
0
votes
1answer
382 views

update kernel version that higher then next rhel update

we have rhel server with the following details kernel version - 3.10.0-327.el7.x86_64 more /etc/redhat-release Red Hat Enterprise Linux Server release 7.2 (Maipo) from dmesg we see many problems ...
1
vote
1answer
28 views

How to make Parent and children share same open file limit

When I have a parent process have a limit of 128 files i.e and I fork, the children will also have 128 files, and if that child forks we'd have another 128 totaling 384. My question is, is it possible ...
0
votes
1answer
24 views

is it ok to combine one machine with network driver ixgbe and other machine with network driver i40e

we have two rhel server redhat 7.6 and redhat 7.2 on the first server 7.2 , the network driver is driver: ixgbe on the second server rhel 7.6 the network driver is driver: i40e dose redhat Linux ...
0
votes
0answers
35 views

why there are missing rpms when installing the same rhel ISO on different machines

we have a very strange behavior after installing new machines with rhel 7.x ( FROM ISO INSTALLER ) we notice that rpm - libcgroup , isn't installed on the current new machines while before couple ...
0
votes
0answers
68 views

Linux Firewall mark classifier (tc-fw) not working after upgrade to Debian 9 - kernel 4.19

i have traffic shape with TC and everything work as i expected on Debian 8 kernel 3.16 . When i upgrade with new kernel 4.19 and Debian 9 the TC-fw and u32 classifying didn`t work . I marked packets ...
2
votes
1answer
456 views

Initial SYN timeout on linux

When establishing a TCP connection, what is the timeout for the first SYN packet sent? If no answer is received another SYN packet is resent (up to net.ipv4.tcp_syn_retries) with approximately ...
0
votes
1answer
147 views

Post kernel update: Only OVH's rescue kernel works - but why doesn't mine?

I just went through upgrading from Debian 9 to Debian 10 and I am having a weird issue. Probably not too weird to people that do more intensive sysadmin things, which is why I bring it here: During ...
0
votes
1answer
48 views

rhel + upgrade individual rpm's from rhel 7.1 to rhel 7.7 or batch upgrade of rpms

We have rhel 7.1 version server , with local repositories of rhel 7.1 ( with rpms’ from rhel 7.1 ) We want to replace the local repository with rpm’s of rhel 7.7 so we intend to Remove the local repo ...
0
votes
0answers
114 views

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 ...
0
votes
0answers
315 views

Ubuntu Server 20.04 freeze/unresponsive, kernel BUG: Bad page state in process

Server Information: Distributor ID: Ubuntu Description: Ubuntu 20.04.1 LTS Release: 20.04 Codename: focal today I noticed my new Server crashed/froze. It did not accept any ssh ...
0
votes
2answers
52 views

Is there anyway to prevent malicious virtual machines from crashing host machine?

I would like to know if there is anyway to ensure security of the host machine while hosting potentially malicious virtual machines. The host machine should never crash or be compromised no matter ...
2
votes
2answers
355 views

Why is IPv6 disabled upon reboot even after configuring sysctl.conf?

First of all it cracks me up how many articles are out there to force IPv6 OFF on linux servers. Come on folks, get with the new! :D root@hodor:~# lsb_release -a No LSB modules are available. ...
0
votes
0answers
720 views

My windows Task Schdulrer is raising this error “0xE0434352”

I have windows server 2012 R2, and i have some tasks inside Windows Task scheduler which use to work well, but yesterday they start to return this error 0xE0434352, as follow:- I checked the Event ...
0
votes
1answer
268 views

Upgrading CentOS 7.4 to CentOS 7.7

How do I upgrade CentOS 7.4 image to CentOS 7.7, and not CentOS 7.8? The latest kernel in the update repos is 7.8, but I cannot find a 7.7 kernel in the repos.
1
vote
0answers
50 views

Linux kernel version with (uname -r) does not show distribution version, where can I get the kernel source for this kernel?

I'm trying to compile a specific kernel module for my linux machine running on a hosted dedicated VPS. The VPS instance is running Ubuntu 20.04 64bit. In order to get the source code for the kernel I ...
1
vote
2answers
70 views

How to diagnose what Java process is doing in kernel space

We have a problem with one Spark (Java) application on our Hadoop cluster. When this workload gets scheduled on 3 machines in our cluster kernel space CPU usage gets a very high. Example recording ...
0
votes
0answers
43 views

Missing logs when SystemMaxUse is reached

i'm using journalctl for logging under kernel 4.9. Now when the SystemMaxUse is reached(currently 16 MB), all new log entries are written to /var/log/journal/../system.journal but are missing after ...
1
vote
1answer
29 views

kernel message, who knows what this means

kernel: [2427107.300793] traps: ATA-0 [27274] trap int3 ip:7f2c48115064 sp:7f2c22e9ad90 error:0 in VBoxDD.so[7f2c480ec000+155000] the message is recorded in the virtualbox host system when this comes ...
1
vote
1answer
67 views

What is the recommended fs.file-max value on redhat7

How to calculate fs.file-max? what is the recommended value for rhel-7 and how to calculate the correct value?
2
votes
0answers
128 views

Effective way to detect NAT network inside of Linux

In Ubuntu I need to detect if the Network ip address is a NAT system, (not need STUN ) I thought check the ip class range type like this: Check if IP address is in private network space But I saw ...
0
votes
0answers
142 views

Custom ubuntu image does not boot on GCE

I want to upload a custom image to GCP, to do so, I installed a Minimal ubuntu 18.04 x64 similarly as this video shows on virtualbox https://www.youtube.com/watch?v=YlcR6ZLebTM. I compiled on the ...
0
votes
1answer
255 views

Can Linux kernel support RSTP (802.1w)?

Last week, I ran Spanning Tree Protocol (STP) in Linux kernel successfully. Now, I am trying to support Rapid Spanning Tree Protocol (RSTP) in Linux kernel. I also found out some solutions in user ...
0
votes
0answers
69 views

flushing iptables causes kernel to hang

On a hypervisor host I have a scripts which uses iptables to setup all the firewall rules for allowing and passing connections across various fabrics and VMs. At the top of the script, I flush the ...
1
vote
0answers
383 views

TCP frequent drop packet

I use Centos 8.1, kernel version 4.18.0-147.8.1.el8_1.x86_64. These days we get frequent TCP packet dropped. When I use dropwatch I get this info: dropwatch> start Enabling monitoring... Kernel ...
0
votes
1answer
53 views

needs-restarting does not acknowledge the new kernel

Could somebody explain why my server has booted up using the latest kernel (v3.10.0-1127.10.1), yet the needs-restarting app says I still need to reboot to the new kernel? [user@domain ~]$ uname -r 3....
0
votes
0answers
33 views

Update Ububtu 16.04 kernel

I try to update Ubuntu kernel from 2.x to 4.x. I download new kernel and unpack it but when I want to upgrade it with this command sudo update-grub I get this error. root@server:~/4.11.2# sudo update-...
1
vote
1answer
220 views

pidstat: difference between task and process?

The pidstat command has options relating to tasks and others relating to processes (e.g. -C and -G). What's the difference?
0
votes
0answers
65 views

Run MongoDB with Unbreakable Enterprise Kernel (UEK) on Oracle Linux

I am running MongoDB v3.4.9 on Oracle Linux Server release 7.7 with the Unbreakable Enterprise Kernel (UEK) 4.14.35-1902.3.2.el7uek.x86_64 for testing purpose. UEK is not official supported on Oracle ...
0
votes
1answer
219 views

How to determine HugePages count?

I have a number of servers that we use as KVM hypervisor nodes. We want to enable hugepages and leverage this features for performance related matters. I have looked online on how to enable hugepages,...

1
2 3 4 5
16