6
votes
0answers
145 views

Linux kernel 3.10.0-123.4.2 processes [flush] aren't present [migrated]

I am using CentOS 7 with "3.10.0-123.4.2.el7.x86_64" version, but I don't know why the kernel threads named flush aren't present in this kernel version. I tried to look in the kernel change log, but ...
6
votes
1answer
116 views

RHEL6 Keeping 1 old kernel and security

I have my RHEL 5&6 servers set to keep 1 old kernel after updates, I do this in case I need to recover the system for any number of reasons. My question is related to security of the system when ...
0
votes
3answers
185 views

Yum update problems on AWS with missing requirements and duplicate sendmail

I am running an AWS VM and tried: sudo yum update Result: Error: Protected multilib versions: sendmail-8.14.4-8.12.amzn1.x86_64 != sendmail-8.14.4-7.9.amzn1.i386 You could try using ...
2
votes
0answers
107 views

Redhat 6.4 configured to log Martian packets but is not logging ll header

I am trying to investigate the source of martian packets I have been seeing on several servers connected to the same subnet. The logging of martian packets has been enabled in /etc/sysctl.conf. ...
0
votes
4answers
99 views

Can 3.2 kernel KVM VMs run in a 2.6 kernel host

So I got a Redhat6.2 and going to install it on a new IBM x3650 m4 server. However I want use Debian because I'm more familier with it. Since x3650 doesn't support Debian(I've tried but no luck), I ...
2
votes
1answer
71 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
vote
0answers
264 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 ...
-1
votes
2answers
879 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 ...
3
votes
2answers
3k views

How to update from RHEL6.1 to RHEL6.2 ,not RHEL6.3

Now I'm using RHEL version 6.1, and would like to update to 6.2. If I use the command , yum update the OS version become 6.3. so I used the command below yum install kernel-2.6.32-220.23.1.el6 ...
1
vote
1answer
428 views

Hotplug area too small error

I have VM running under RHEL6, which is running under HyperV. It has a lot of important soft installed, but does not have suffocating workload (~10% CPU is used). It's been really unstable recently ...
3
votes
1answer
1k 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 ...
2
votes
1answer
934 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 ...
1
vote
1answer
356 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 ...
-3
votes
2answers
243 views

Error in Virtual box with RHEL 6

While using Virtual Box in RHEL 6 at the time of starting virtual OS getting following error. Help me to resolve this. Virtual Box version VirtualBox-4.1-4.1.8_75467_rhel6-1.i686 Operating System ...
4
votes
5answers
2k views

Reboot fails on RHEL 6.1 after kernel update on Amazon EC2

Everytime I start a new RHEL instance, I like to perform a yum update to start with the most up-to-date system. However, everytime I try to reboot the instance after that, the instance never goes ...
2
votes
1answer
339 views

Linux kernel module file size

I'm trying to update the kernel on a CentOS 6 machine with a vanilla 3.1.0-rc10 kernel. It seems to work, except the modules that get created are significantly larger in size than those that come ...
-1
votes
3answers
12k views

How do i view / enable kernel logs on centos / red hat linux? [duplicate]

Possible Duplicate: How do i view / enable kernel logs on an ec2 instance (amazon linux)? I've got a centos server that i'm playing around with TCP settings in the sysctl.conf to increase ...
0
votes
1answer
205 views

huge mem kernel advice RHEL4

I've been asked to investigate adding extra memory (> 16gb) to a RHEL 4 server and moving to a huge mem kernel. The server is used for Oracle RAC. Is it just a case of installing the hugh mem kernel ...
1
vote
2answers
467 views

Uninstalling old kernels from Redhat boot partition

Took over an older system and found that the /boot partition was 90% full. After some searching on the net I found that there are older kernels installed that's taking up disk space. Doing rpm -qa ...
1
vote
2answers
1k views

What can cause a kernel hang on redhat 4?

I've to solve a nasty problem on a ten machine "cluster": randomly one of these machine hang during an hard computation, sometime still ping sometime not. The problem was described me at the phone, ...
1
vote
2answers
3k views

RHEL 6 vs latest vanilla kernel differences?

What are the differences of the RHEL 6 kernel and the latest kernel.org one? I know RHEL is based on 2.6.32 with some features backported from newer kernels and that it also has other features that ...
0
votes
2answers
2k views

Kernel Panic - not syncing: attempted to kill init (for VM image from a physical machine)

I had a CentOS 5.4 x86_64 machine where I imaged the primary partition with the following command so that I could run it in a VM on my local machine for testing. #dd bs=1024 count=10482412 if/dev/sda ...
0
votes
1answer
585 views

Installing Linux kernel 2.6.25.14 on RHEL 5.4

I have to install Linux kernel version 2.5.25.14 on a RHEL 5.4 server because of drive compatibility issues. I follow the RedHat "Building a Custom Kernel" instructions running the following: $ ...
1
vote
1answer
5k views

How do I remove Xen kernel and put normal kernel on RHEL 5

I have 3 identical machines (hardware wise) that all have RHEL 5.3 installed. 2 of those machines have the Xen kernel and one doesnt. I cannot install nvidia drivers on the ones that have the xen ...
1
vote
3answers
6k views

shmmax setting in sysctl.conf not taking effect

We are running RHEL 4 Update 6 and I am going through an Oracle installation. As per the Oracle Installation Guide I am trying to update the shmmax value. As per the guide I have added the following ...
1
vote
3answers
979 views

ServeRAID 8-k linux kernel support: preferred distribution?

Setting up a new IBM x3650 server with a ServeRAID 8-k RAID controller (for running PostgreSQL), I'm hearing advice that I should go for Red Hat rather than Debian lenny (my intended distribution) ...
0
votes
2answers
116 views

kernel version before installing it?

I have redhat 4 with : Actual kernel-----------------------> 2.6.9-78.0.17.ELsmp new kernel available (up2date) --------> 2.6.9-89.x.xx. For some reason , i need the new kernel version number ...