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 ...
-2
votes
0answers
23 views
GRsec Kernel vs CloudLinux Kernel for Shared based web hosting [closed]
Is GRsec more secure with all of it's buffer overflow typw protections or does CloudLinux have it's edge with the CageFS?
0
votes
1answer
18 views
How to avoid syn cookies
I've got a (TCP) server that handles a big number of new connections per second (1000 - 5000). This causes syn cookies to be send:
kernel: possible SYN flooding on port 2710. Sending cookies.
Syn ...
0
votes
0answers
25 views
Troubleshooting Bug: Soft Lockup [migrated]
We're having some trouble here with "soft lockup"s in our /var/log/syslog. The system seems to freeze for 10-70 seconds, then comes back. This is affecting web serving and other key processes. It ...
0
votes
1answer
36 views
Debian and Kernel Versions
Debian is running 2.6.32-5. Recent kernels seem to have addressed some kernel soft lockup issues, I'd like to try them. Although... the patches don't seem to be in the Debian-stable repository.
# ...
-3
votes
0answers
106 views
1
vote
1answer
31 views
Compiling Linux kernel “correctly”
Recently I have come across a security module for the Linux kernel called Linux-VServer which allows you to virtualize many things and "partition" the OS to reduce the effects of a compromise. I was ...
1
vote
2answers
97 views
server running out of memory
the server is running out of memory and get to the point where it starts killing the process, the total PSS memory(actual memory used from the Resident memory) consumed by top using applications is ...
1
vote
2answers
60 views
Two server freezes with in two weeks
Two consecutive server freezes with in two weeks.
We are running ubuntu 11.04 64bit on Intel(R) Xeon(R) E5620 @ 2.40GHz with 48 Gb RAM on 2.6.38-13-generic kernel dedicated server.
after making ...
-1
votes
2answers
76 views
Can it be because of any Kernel Bugs?specifically spin lock
We are running ubuntu 11.04 with 2.6.38-13-generic kernel on
Intel(R) Xeon(R) CPU E5620 @ 2.40GHz with 48 GB RAM dedicated server with Hardware RAID.
top command output is showing many kernel ...
1
vote
1answer
54 views
What is oom-kiler and why is it happening ? Should I avoid it?
I have a server that is now having "invoked oom-killer" many times a day ! I never saw that and even after reading tons of forums on Internet I'm still puzzled : is it a big problem ? Why is it ...
0
votes
0answers
17 views
OpenAFS on OpenVZ guest
I'm trying to install and configure an OpenAFS server inside an OpenVZ container.
However, when running afs-newcell, it complains that the AFS client cannot be started. It says "AFS module ...
0
votes
4answers
84 views
rtl8139 driver in modern linux kernels - is it included?
I need to support the realtek rtl8139 network card - is this included in modern (> 3.0) linux kernels? do I have to load any modules or install anything?
1
vote
0answers
73 views
Ubuntu - random reboot since 3.0 kernel
I have an Ubuntu Server that is now upgraded to 12.04 LTS server. Ever since I've upgraded from 10.10 to 11.04, when the kernel went from 2.6.38 to 3.0.anything, my machine would constantly randomly ...
1
vote
1answer
55 views
Redhat Linux Kernel what does GA mean?
When Redhat release a new major version such as 5.3, 5.4,5.5 .. the kernels seem to be referenced as GA , what does GA stand for ?
example in this info doc
...
0
votes
0answers
32 views
which `install.sh` does `make install` use?
I am trying to learn what make install does in the context of building a custom kernel.
(reference: ...
0
votes
2answers
106 views
Compiling linux kernel - `make install` asks for LILO. Now what?
So I am following this guide to compile my custom kernel - http://library.linode.com/linode-platform/custom-instances/pv-grub-custom-compiled-kernel#sph_compile-and-install-the-kernel
So far so good, ...
2
votes
0answers
72 views
Learning how to build my own linux kernel [migrated]
Reference - http://www.linode.com/wiki/index.php/PV-GRUB#Building_Your_Own_Kernel
In order to work with Xen, a number of options that must be selected:
CONFIG_PARAVIRT_GUEST=y
CONFIG_XEN=y
...
1
vote
1answer
70 views
What could cause a sudden extreme increase in io load on my postgres database server?
I have a postgres server running since years and the load have been more or less constant (load average around 0.5-5). Yesterday it reached an average of 110!
It is a virtual server running Debian ...
1
vote
0answers
35 views
Find counts of ulimit quotas
So, we may have some sort of zainy leak in our software. We're using Mono and spawning many processes over the course of weeks/months. Eventually, we can't spawn anymore on our clients machines. It ...
0
votes
1answer
190 views
E: Sub-process /usr/bin/dpkg returned an error code (1)
I'm getting an error while trying to update the linux-image-2.6.32-5-amd64 package on Debian 6, x64.
Setting up linux-image-2.6.32-5-amd64 (2.6.32-41squeeze2) ...
Running depmod.
Running ...
2
votes
2answers
61 views
named gets killed
Every once in a while, my server will kill named. This gets logged:
Apr 16 17:00:08 li127-203 kernel: Out of memory: Kill process 15723 (named) score 38 or sacrifice child
Apr 16 17:00:08 li127-203 ...
2
votes
1answer
224 views
HP ProLiant Support Pack (PSP) creates multiple grub entries
After installing HP's PSP 8.73 on RHEL5 with a G7 Blade, I end up with 4 grub entries
1 The Standard RHEL
2 HP (choosen as default)
3 HP hpahcisr
4 HP mptlinux
I'm confused as to why I get all ...
0
votes
0answers
37 views
Atop shows problems with paging frequency
I have a debian server and when running "atop 1" the "PAG" row is nearly always red which shows an issue with the paging frequency. Here is an example
PAG | scan 10477 | stall 0 | ...
0
votes
0answers
47 views
FreeBSD - memory gap
I came across script that prints some memory informations and here is my output:
SYSTEM MEMORY INFORMATION:
mem_wire: 4133535744 ( 3942MB) [ 12%] Wired: disabled for paging out
mem_active: ...
0
votes
1answer
83 views
How to use Linux 3.3 BQL (Byte Queue Limits)? [closed]
How do I take advantage of the BQL (Byte Queue Limits) in Linux 3.3?
Do I just install the kernel?
Does it help with UDP traffic?
0
votes
1answer
51 views
net_device get_stats function, how to use? [closed]
I'm trying to write a linux kernel module to get stats from my NIC, I learned that a struct called net_device has a function called get_stats that returns a struct with a lot of statistics that I need ...
0
votes
0answers
121 views
Ubuntu 10.04 Server w/ root on LVM2, Cannot boot after kernel update
I am running an Ubuntu 10.04 Server with root on a md raid 5 / LVM2 volume. After a kernel update, boot hangs at initramfs saying it gave up waiting for root, "ALERT! /dev/disk/by-uuid/##..## does ...
8
votes
2answers
193 views
Linux Kernel Versioning: Debian Sid vs Ubuntu Precise
I have setup two machines:
On one machine I have installed Ubuntu Precise 12.04 beta and dist-upgraded to the latest packages.
On the other machine I have installed Debian Sid Unstable and ...
2
votes
0answers
235 views
Converting an EC2 AMI to vmdk image
I've come quite close to getting Amazon Linux to boot inside VirtualBox, thanks to this answer and these websites. A quick overview of the steps I've taken:
Launch EC2 instance with Amazon Linux ...
1
vote
1answer
113 views
Redhat Kernel patching advice
An audit has pointed out that a RHEL server I manage has not had the latest kernel patches applied. I'm confused about kernel patching and within RHEL in relation to RHEL dot releases i.e 5.2 , 5.3 ...
1
vote
1answer
197 views
Sporadic unspecific kernel panic
I'm experiencing seldom (so far about once a month) hard crashes on our ubuntu server 10.04 LTS box. The box itself is quite old (Dell PowerEdge 750 from 2004, Pentium4 2.8 GHz). I set up netconsole ...
2
votes
3answers
270 views
How to set shmall, shmmax, shmni, etc … in general and for postgresql
I've used the documentation from PostgreSQL to set it for example this config:
>>> cat /proc/meminfo
MemTotal: 16345480 kB
MemFree: 1770128 kB
Buffers: 382184 kB
...
0
votes
0answers
95 views
How to get Paged/NonPaged Memory limit in ProcessExplorer (Win 7, x64)
I'm trying to get the paged/non-paged kernel memory limit on my machine (Win 7, x64) with ProcessExplorer v15.13 but it keeps giving me "No Symbols" although I set up everything according to the ...
0
votes
1answer
130 views
Build kernel headers to compile R1Soft hcp module
I'm running a Xen based VM with CentOS 5, and my hosting provider pushes kernel version 2.6.37.6 from the host machine (so no pv-grub).
[root@dev ~]# uname -r
2.6.37.6
I'm trying to install the ...
0
votes
1answer
74 views
ASUS PIKE 6480 doesn't work with debian?
I have DIYed an 1U server with [ASUS Z8NA-D6] motherboard, PIKE 6480
extended RAID card, and four SAS hard disk. And I can find this extended card's module in the linux kernel called mvsas. But fail ...
1
vote
2answers
153 views
New kernel compilation on CentOS
I'm trying to compile and install kernel 3.2.9 for CentOS 5.6.
I compiled new kernel and installed kernel modules:
make && make modules_install
I also created new initrd image:
mkinitrd ...
1
vote
1answer
87 views
Under what circumstances will Linux ignore the route table when choosing the MAC address for an outbound frame?
While debugging a problem with the networking configuration for a set of virtual machines running under KVM, I discovered a circumstance where the kernel in the guest VM has decided to stamp the ...
1
vote
1answer
20 views
Linux group keyring (eg request_key and add_key)
I'm working on building an application that needs to use the group keyring to share some sensitive data between processes with different owners. Whenever I try to access the group keyring (e.g."@g") ...
0
votes
2answers
126 views
Kernel update without reboot [closed]
Possible Duplicate:
Reloading a kernel “live” in CentOS / RHEL 6
How can i update kernel on Centos without reboot .?
I found ksplice but it is not supported for Centos.
...
0
votes
1answer
90 views
How to start compiling Linux in a KVM virtual machine?
I want to learn more about the Linux kernel, which means I want to start compiling and testing my own kernel. I'm running Ubuntu 10.04 on my box, so I'll be using QEMU/KVM for virtualization.
I was ...
0
votes
0answers
37 views
Weird errors in system.log while trying to run .kext
UPDATE: I was looking in the wrong log file. The kernel log is /var/log/kernel.log. D'oh
First, I don't know if this is the correct place to put this question. Would Stackoverflow or Apple be better?
...
0
votes
1answer
67 views
Yum freezes on Running Transaction Check
Strace: http://pastebin.com/r8D39yLg Kernel:
2.6.18-274.12.1.el5.centos.plus #1 SMP Tue Nov 29 18:16:47 EST 2011 x86_64 x86_64 x86_64
GNU/Linux System: CentOS 5.7 64-bit
How to fix this ?
1
vote
1answer
117 views
Finding out TCP Initial Window segment size in linux
I run Centos
[user ~]$ cat /etc/redhat-release
CentOS release 6.2 (Final)
With kernel
3.0.4-x86_64-linode21
How do I check the TCP initial window size in my OS? I need to verify that the IW is ...
0
votes
1answer
129 views
iptables DNAT from loopback
I'm trying to understand the limitations of using iptables DNAT with loopback addresses. Consider we have an application which can connect only to 127.0.0.1; the obvious solution to make server and ...
1
vote
0answers
90 views
CentOS OpenVZ fail to boot after kernel update
After upgrading to latest OpenVZ kernel CentOS server won't boot. When i try go boot the latest kernel server is stuck at this point: (note that images are taken from virtual kvm)
...
1
vote
1answer
109 views
How can I find the cause of a system hang from the system logs?
I am running a Ubuntu 10.04 LTS in an Amazon EC2 instance.
The system suddenly became unresponsive. When I checked the log files I found the following errors in /var/log/syslog
Feb 22 04:10:01 ...
0
votes
1answer
93 views
yum install kernel source
I'm installing dahdi on my Fedora 15 machine and when I try to build, I receive the following error
You do not appear to have the sources for the 2.6.38.6-27.fc15.x86_64 kernel installed.
The ...
0
votes
3answers
416 views
How long does it take to fsck a volume?
We are running website which is currently serving 3-5 million page views. Our site is file sharing site and so it contains 250,000 files and few thousand symbolic links.
The hard disk is a 1500GB ...
0
votes
0answers
41 views
How long does it take FSCK to run [closed]
Possible Duplicate:
How long does it take to fsck a volume?
so,
we are running website which current serving few 3-5 million page view
our site is file sharing site and so its contain ...
0
votes
0answers
90 views
xen domU kernel panic with “alignment check” on 2.6.32-5-xen-amd64
I'm running 2.6.32-5-xen-amd64 on a domU with Debian stable and 6 vcpus. Without changing anything in the architecture 3 days ago it started throwing kernel panics on high load. I've researched online ...
