All Questions
120
questions
-2
votes
1
answer
40
views
What important side effects causes on a RHEL system to disable user namespaces?
In order to mitigate a CVE issue I have on a list of servers, I came across this link from RHEL. Under the mitigation steps, there are two options, one is to blacklist a nfs_tables kernel module which ...
- 3,181
6
votes
1
answer
485
views
How can I confirm for sure that a CVE has been mitigated on a RHEL system?
I have this problem, I'm trying to see if a group of servers are vulnerable to the CVE CVE-2024-1086 so what I do in the server is rpm -qa --changelog kernel | grep 2024-1086, and I get this as output:...
- 3,181
0
votes
0
answers
45
views
Linux Redhat9: kernel warnings: user: probe of wq1.0 failed with error -95
I have linux Redhat 9 on intel x64 machine and I see following warnings during boot in dmesg:
user: probe of wq1.0 failed with error -95
user: probe of wq1.1 failed with error -95
user: probe of wq1....
- 1
0
votes
1
answer
65
views
CentOS 7.9 not reporting full version number after recompiling kernel
I needed to enable SCSI support in CentOS 7.9 so I followed the instructions here:
https://wiki.centos.org/HowTos(2f)I_need_the_Kernel_Source.html
to add SCSI support and recompile, which worked as ...
- 3
0
votes
1
answer
139
views
/boot/config missing for new kernel
I compiled the latest Linux 6.6.9 kernel from source and after installation, when I run cat /boot/config-$(uname -r), I get an error:
cat: /boot/config-6.6.9: No such file or directory. The config ...
- 11
2
votes
1
answer
868
views
The grub2-mkconfig does not propagate renamed root logical volume on RHEL 9
On the RHEL 9.3 I have renamed the logical volume (LV) /dev/lvm01/root to /dev/lvm01/root.vol. I did everything to make the new name correctly recognized:
changed /etc/fstab entry
reloaded systemd ...
- 9,822
0
votes
1
answer
68
views
CPU IDLE low as results of bad disks is it the case here
Low CPU IDLE can be caused by a variety of factors, including:Insufficient RAM or slow Hard Disk Drive
but in our RHEL server RAM memory have enough RAM but from dmesg we found couple errors about the ...
- 13.4k
0
votes
1
answer
35
views
Alert for centos7 kernel update
I would like to know how to set an alert on our monitoring tool, Whenever there is an update availbale for centos7 kernel version in Redhat site or in centos site..
0
votes
1
answer
379
views
RHEL 7.9 + microcode_ctl + warning in kernel messages
I want to share the following issue
after upgrading the security rpm's on RHEL 7.9 machines include update of microcode_ctl rpm
rpm -qa | grep microcod
microcode_ctl-2.1-73.15.el7_9.x86_64
we noticed ...
- 13.4k
1
vote
1
answer
1k
views
Linux Traffic Control (tc) not working without reboot
When trying to run
tc qdisc add dev $INTERFACE root handle 1: prio priomap 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
tc qdisc add dev $INTERFACE parent 1:1 handle 10: netem loss "${LOSS}"%
I ...
- 111
1
vote
1
answer
884
views
RHEL - keeping a specific kernel version, possible?
I was looking to keep a specific kernel version on my machine. To prevent it from being overridden or removed without having to grow or up the # of kernels the system keeps as my only solution as ...
- 11
0
votes
0
answers
239
views
how to exclude not important kernel messages that hide the real kernel messages lines
we have HP HW ( DL 380 G10 ) physical REDHAT machines. ( version 7.5 )
and as we can see the kernel messages are filled by the following messages about.
ACPI Error: Method parse/execution failed [\...
- 13.4k
0
votes
1
answer
32
views
how to verify when RAM memory was update on RHEL machine
we have VM machines (machines are RHEL 7.9), and recently machines RAM memory was update from 32G to 64G
is it possible to verify on which date? memory was update?
- 13.4k
-1
votes
1
answer
33
views
RHEL + kernel messages + how to identify if kernel message are indicated on a problem
we have old RHEL 7.2 server, and we notice about very strange kernel messages
not sure if below line defined a problem
[ffffea00a5a00000-ffffea00a5bfffff] PMD -> [ffff880015000000-ffff8800151fffff] ...
- 13.4k
0
votes
2
answers
895
views
how to identify if rhel 7 machine requires reboot after kernel update
as all know after kernel upgrade (on RHEL 7), reboot is necessary in order to update the kernel version
So after reboot we can verify the kernel version by uname -r
since we are using scripts for ...
- 13.4k