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 ...
0
votes
0answers
21 views
Wndows Azure: “Linux Integration Services for Hyper-V has been removed.”
When I am trying to yum update my centos in Windows Azure, the following appeared
Linux Integration Services for Hyper-V has been removed. Please reboot your system.
So I reboot it. But ...
0
votes
1answer
36 views
How to update/maintain a patched kernel?
If I patch my linux kernel with grsecurity, will I still be able to update my system with yum (or apt-get)?
Won't the updates available via yum be incompatible with my patched "non standard" version ...
1
vote
2answers
66 views
fix kernel on Xen Server hypervisor vps
I have a cloud server hosted at Rackspace, and they use Xen Server hypervisor. I was running Ubuntu 12.04, and really messed up by attempting to do a release upgrade manually.
The hypervisor ...
1
vote
0answers
20 views
High shmmax value in Redhat 6.3
We are using Redhat 6.3 with 30G RAM to host our Postgres server.
The (default) shmmax value is 68,719,476,736
In some forums I have read that having an shmmax value larger than the RAM causes ...
-1
votes
0answers
11 views
PID Capturing via LSM Hooks in Linux Kernel 3.2 [closed]
I am grabbing the LSM hooks in my own created module and showing into the securityfs psuedo filesystem which is showing correctly.
The path where these hooks are showing is
...
-1
votes
0answers
15 views
Forwarding information about status of virtual interfaces
I need to send message with information about status of virtual interfaces on eth interface, every time when that status is changed using command ifconfig (for example interface virt1 goes down).
How ...
0
votes
1answer
62 views
Multiple ethernet interface on one ethernet card
First I must say that I am new in linux and maybe I will ask trivial question.
My job is to create 8 ethernet interface to be visible in kernel, but all of them should send and receive data through ...
1
vote
0answers
24 views
Xen hangs on boot when scrubbing RAM
I have a CentOS 5 server I can boot into the stock kernel just fine, but when I try kernel-xen, it gets stuck here:
http://i.stack.imgur.com/wAI20.png
When I try adding no-bootscrub to the kernel ...
0
votes
1answer
88 views
How can I diagnose and fix frequent 100% cpu utilization from kernel?
I have an Amazon EC2 micro instance running an old 2.6.16 kernel. It runs postfix, apache, and mysql. During normal loads, it's load average is around 0.05, and it runs this way 95% of the time or so. ...
0
votes
1answer
47 views
RHEL 6.0 upgrading kernel from 2.6.32-71.el6.x86_64 to 2.6.32-358.2.1.el6.x86_64
[root@localhost ~]# rpm -ivh kernel-2.6.32-358.2.1.el6.x86_64.rpm
error: Failed dependencies:
bfa-firmware < 3.0.3.1 conflicts with kernel-2.6.32-358.2.1.el6.x86_64
[root@localhost ~]# rpm ...
3
votes
2answers
254 views
“Never take kernel updates” — Any truth to this?
So I am having a discussion with a coworker today, and he let something out that I thought was bizarre, as I'm getting ready to apply security updates to one of our production servers.
"You should ...
0
votes
1answer
156 views
Kernel 3.8, Apache2 with WSGI : INFO: task apache2 blocked for more than 120 seconds
We have upgraded our Kernel from 2.6.32 to 3.8.7 on a Debian system. We have a sharing with NFS to get the data for Apache2. And Nginx serves only static files as a proxy.
Since we have installed the ...
0
votes
0answers
53 views
How to fix inode errors and issues - CentOS
My server is keep crashing. It happens randomly every few days tough.
Today it happened while I was logged in trough SSH and it said:
Message from syslogd@ at Mon Apr 15 14:43:42 2013 ...
ns213921 ...
0
votes
2answers
36 views
Check my Kernel for SELinux Support
I want to know if the kernel i am running has support for SELinux. What commands would i use to check this ?
1
vote
1answer
63 views
Adaptec RAID array was not detected after updating the kernel?
Continue from this topic, the newer kernel booted successfully but it doesn't see my sdc - which is a hardware RAID array (level 10).
I'm sure the aacraid module is loaded:
# grep aacraid ...
1
vote
1answer
73 views
Kernel attempts to kill MySQL with sigkill
I'm running an Ubuntu server for MySQL.
Server info
Ubuntu 12.10
MySQL installed via apt
RAM: 512M
innodb_buffer_pool_size : 300M
There is no other memory intensive application running on this ...
1
vote
2answers
51 views
Kernel Configuration, Which Processor family?
Which processor family should I use for the cpu shown below for the best fit?
1
vote
2answers
38 views
Debian Squeeze Kernel
I'm running Debian Squeeze completely up to date on a machine. However when running uname I see that I'm on a very old kernel:
$ uname -r
2.6.32-5-amd64
Is this normal for Debian Squeeze?
Should I ...
1
vote
2answers
78 views
Increase FD limitation then SSH not working?
I'm using CentOS 6.3 64bit, and having trouble with increase FD limitation: SSH not working after changed the limitation, every-times I logged on my server, after typed password, then "connection ...
0
votes
0answers
100 views
CentOS 6 won't load default (new) kernel, loads (another) older one instead
I am having a weird issue with a CentOS 6 system.
I have upgraded the kernel twice now and when I reboot the system it still loads the older kernel. I also had a dc tech watch the screen as it ...
1
vote
1answer
61 views
Apache2 reload and System Crash
Reloading Apache2 caused Ubuntu 11.04 to Hang/Crash.
Load average was 32
CPU Cores:8
Model: Intel xeon E5620
RAM:16 GB
Kernel :2.6.38-13-generic
Apr 6 09:05:11 406852 kernel: [3715446.033031] ...
0
votes
1answer
58 views
Is tcp_keepalive application dependant on Linux?
According to http://tldp.org/HOWTO/TCP-Keepalive-HOWTO/index.html , the kernel keepalive function occurs at the OS level, and doesn't require an application to explicitly call it. However I also read ...
4
votes
3answers
243 views
Compiling kernel version >= 2.6.34 on CentOS 5: RAID set “ddf1_foo” was not activated?
I want to mount a Ceph FS on some CentOS 5 servers. Since the ceph-fuse failed with below errors:
# ceph-fuse --no-fuse-big-writes -m 192.168.2.15:6789 /mnt/ceph/
ceph-fuse[7528]: starting ceph ...
0
votes
2answers
203 views
Issue on yum update with kernel
--> Running transaction check
---> Package e2fsprogs-resize2fs-static.x86_64 0:1.42.3-3.el6.1.ovz will be installed
---> Package kernel.x86_64 0:2.6.32-358.2.1.el6 will be installed
--> ...
1
vote
3answers
194 views
CentOS 6: strange page allocation failure messages [duplicate]
I set up a new Server with CentOS 6.4 final as successor for an old mysql server and I'm facing some problems with it. From time to time mysql connections are being disconnected. Furthermore the ...
0
votes
1answer
39 views
Compile Kernel Debian Squeeze
Am newbie, and I'm trying on Debian Squeeze to upgrade/compile kernel for problem I'm having with Linux-Vserver. The instructions I'm trying to use start with "apt-get installlinux-source-2.6.32" and ...
1
vote
1answer
138 views
Linux server resend SYN ACK
I am troubleshooting a connection timeout problem between two Linux boxes, where it seems the ACK to SYN-ACK was lost on the server's stack.
The tcpdump is done on the server side.
The client got ...
1
vote
1answer
436 views
CentOS 6 Xen guest fails to boot after 'yum update'. Kernel?
I Seem to be having an issue with a Xen guest not booting after a yum update.
DomU Configuration:
#kernel = '/boot/solus-vmlinuz'
#ramdisk = '/boot/solus-initrd.img'
bootloader = ...
2
votes
1answer
54 views
firewall output flooding dmesg
I log all dropped packets using following iptables rule:
-A INPUT -j LOG --log-prefix "FW_DROP: " --log-level 7
and then in rsyslog.conf, I redirect this output to a separate file, so that my ...
1
vote
0answers
100 views
UDP socket receive buffer size change on RHEL6.3
Our system used to work on RHEL5.3 And the socket receive buffer size is 64k. And that works fine. We can get message size up to 64k on UDP socket.
But after system upgrade, it is running on RHEL6.3 ...
0
votes
2answers
141 views
Why does my server boot the old debian kernel?
I got a vServer with Debian installed (important because I have no idea of how Debian was installed and/or built). Output of ~# uname -r: 2.6.26-2-xen-amd64.
After execution of (first some other ...
0
votes
1answer
80 views
Linux Kernel Scheduling Algorithm [closed]
I intend to design a scheduler and dispatcher, that would handle context switching routines for the OS(Linux). We're planning to use the NPTL library to ensure 1-1 correspondence between kernel ...
8
votes
4answers
426 views
How can I troubleshoot high Kernel time?
I have unusually high Kernel time on my CPUs as shown in task manager.
What are some ways I can troubleshoot this?
0
votes
0answers
41 views
mpt2sas1: log_info(0x31120303): Disks dropped from RAID
In my syslog I get loads of:
Mar 1 11:20:07 franklin kernel: [72947.878407] Waking error handler thread
Mar 1 11:20:07 franklin kernel: [72947.878415] Error handler scsi_eh_1 waking up
Mar 1 ...
-1
votes
2answers
115 views
Is the latest kernel mainline release stable [closed]
Looking at kernel.org the latest mainline release is 3.8. Zhe site also states the latest stable release is 3.7.9.
Now looking at http://en.wikipedia.org/wiki/Linux_kernel inside the version history ...
-2
votes
1answer
67 views
btrfs balance kernel bug? [closed]
After getting a little annoyed with no space left errors when deleting files
I started a btrfs balance process and 2-3 times the following appeared.
Is this serious for my data or can I just ignore it ...
2
votes
3answers
102 views
How to install packages with APT without user interaction?
I have a script that downloads and replaces kernel headers in Debian squeeze.
function fixHeaders(){
#Replace the kernel headers from OVH with standard kernel headers...
aptitude -y install ...
0
votes
0answers
39 views
Initrd : how detect inside linuxrc what devices are connected
I want to detect inside the linuxrc script what device are connected to the PC in order to set the appropriate value for /proc/sys/kernel/real-root-dev and have the same initrd able to boot on ...
0
votes
0answers
77 views
kernel: e2label: sending ioctl 127c to a partition
This is the first time I've noticed the following:
kernel: e2label: sending ioctl 127c to a partition
With a search I've found:
https://lkml.org/lkml/2012/1/26/432 – it is a warning message ...
1
vote
1answer
190 views
Kernel Errors Present: EXT4-fs
Logwatch is giving me the following error:
WARNING: Kernel Errors Present
EXT4-fs (sda1): error count: 4 ...: 1 Time(s)
EXT4-fs (sda1): initial error at 1350482172: e ...: 1 Time(s)
EXT4-fs ...
7
votes
2answers
250 views
/dev/shm & /proc hardening
I've seen mention of securing /dev/shm and /proc and I was wondering how you do that and what it consists of doing? I assume this involves /etc/sysctl.conf editing of some kind right.
Like these?
...
3
votes
3answers
65 views
How to determine if a Debian upgrade updated the kernel
Let's say I have just done an aptitude safe-upgrade on a Debian system, but I was not paying attention so I did not notice if the kernel was updated or not.
How can I now determine if there was a ...
1
vote
2answers
110 views
How to differentiate intentional reboot and power failure from logs
One of my centos host rebooted recently unfortunately no monitoring was implemented
.
How can i find out what caused it to reboot.
i only have ssh access to it.
How can determine if the cause is due ...
-1
votes
2answers
244 views
Why does Centos 6 have an older kernel than Ubuntu 12.04 [closed]
Hi can some one help me in understanding this.
On Centos 6.2 its showing kernel as 2.6.32-220.el6.x86_64
whereas on Ubuntu 12.04 its showing as 3.2.0-23-generic.
3.0 kernel is one of the latest ...
2
votes
2answers
226 views
Xserve 10.6.8: Why do `net.inet.ip.forwarding` & `net.inet.ip.fw.enable` kernel sysctl settings stay enabled even disabling?
Very bizarre situation. I have inherited a few Xservers from a previous admin that I have been charged with cleaning up on various levels. I am familiar with settings in Ubuntu & am very ...
1
vote
2answers
94 views
Different uname -a results
I am working on a multi-server system for a client. All of the servers are fresh installs (although two were installed a couple of months ago, five a couple of days ago).
They are all supposed to be ...
0
votes
1answer
73 views
How to check a driver version in linux kernel update
How I can find an information about the driver version in linux kernel update for NIC:
Current:
# uname -r
2.6.32-279.2.1.el6.x86_64
-
# ethtool -i eth0
driver: e1000e
version: 1.9.5-k
...
0
votes
0answers
98 views
Installing Kernel for OpenVZ Centos
Can I install this kernel https://centos.mirror.netriplex.com/openvz/kernel/branches/2.6.27/2.6.27-repin.1/
on my Centos 5.9 server without any issues?
I really need something higher than my 2.8.18. ...
0
votes
1answer
121 views
Ubuntu 12.04 kernel issues [closed]
I'm running Ubuntu Linux 12.04 and the current kernel installed is Linux 3.2.0-23-generic on x86_64This is a fresh install of 12.04 as my older server had hardware issues. The problem I see now the ...
-1
votes
1answer
113 views
Network kernel issue dst overflow
I am currently having a issue with my server, apperently after awhile, my network will slowdown and later stop working. It shows this:
Dst overflow
My kernel is 2.6.18-308.8.2.el5.028stab101.1 #1 ...
