All Questions
53
questions
0
votes
0
answers
49
views
Centos 7 Increase CMA Size
I have a SBC module and it has Centos 7 with 3.10.0-1160.114.2.el7.x86_64 kernel version. I have to increase CMA size to 128MB which is default 4MB. I check my kernel menuconfig and DMA Contiguous ...
- 1
2
votes
2
answers
501
views
How to prevent Centos from recovery password in remount - Grub?
As you know, recovering the root password of CentOS is easy. You can enter 'E' in GRUB and try to remount. Is there a way to prevent any password recovery?
I want to limit all general ways of ...
- 37
0
votes
1
answer
142
views
Booting into Xen with grub2-mkconfig 2.03 on centos8 x86_64
Linux localhost.localdomain 4.18.0-394.el8.x86_64 #1 SMP Tue May 31 16:19:11 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
grub2-mkconfig (GRUB) 2.03
On my centos8, I have installed centos-release-...
0
votes
1
answer
476
views
CentOS Master Boot Record Overwritten
On my CentOS 7.7 box, I installed another drive and installed AlmaLinux 9. Things went wrong at that point. I thought I could just use the BIOS to choose which OS I wanted to load. Isn't the case ...
- 144
0
votes
1
answer
855
views
Adding new entry on the GRUB on CentOS Stream 8
I want to add new entry into grub2 menu on CentOS Stream 8
I set the following contents to
/etc/default/grub
GRUB_TIMEOUT=10
GRUB_TIMEOUT_STYLE=hidden
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /...
0
votes
1
answer
2k
views
CentOS 7 - Isolated cores are not isolated in practice
I have a pair of CentOS 7 servers (7.9.2009) with 8 physical CPUs each.
Out of those, I'm trying to isolate cores 4-8 (so 3-7 as the OS sees them).
I added the tag isolcpus=3-7 to /etc/default/grub ...
- 157
0
votes
0
answers
88
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How to make GRUB on HD boot a bootable USBDrive or from a `.iso` on USBDrive?
I'm currently struggling with a project where I need to make it boot from a bootable USBDrive using GRUB. (alternatively I could make a NTFS USBDrive with the raw .iso file) When I enter GRUB's ...
- 101
1
vote
1
answer
1k
views
Missing console output after grub
I'm trying to boot CentOs already installed on an appliance.
This appliance has only two input connectors:
1 USB port, where I plugged in a USB hub, to which I connected a keyboard
1 Male 9 Pin ...
- 111
2
votes
1
answer
468
views
CentOS 8 can't boot after cuda toolkit installation
[Lenovo LEGION laptop with dual boot - win10 and centos 8]
I was trying to run some YOLOv5 example on my laptop Tutorial#1, using pycharm.
to keep it under control I've generated an yolov5 conda ...
- 21
0
votes
0
answers
98
views
Moving to CentOS 7 from UBUNTU dual boot with Windows 10
I currently have a Dual boot OS (Ubuntu 18.04 and Windows 10). Due to the software I have to work on, I need to migrate to CentOS 7.
Is there any guide to migrate without corrupting the Windows 10 ...
- 101
0
votes
1
answer
2k
views
linuxefi causes "you need to load kernel first"
I am aware of the multiple questions regarding this matter but this one seems to be different. This is the Grub configuration our PXE boot server provides:
net_ls_addr
sleep -i 5
set retcode=$?
clear
...
- 337
1
vote
1
answer
6k
views
Grub randomly stopped working, modinfo.sh doesn't exist, proxy stops yum install from internet
So a couple days ago my Centos 7 installation just... decided to stop working.
I had left the computer on over a weekend. There were no issues with it before I left it. When I came back, the monitor ...
- 131
0
votes
1
answer
417
views
Dual boot CentOS7 with Windows 10: Can't boot into CentOS
I was using CentOS 7 and Windows 10 as a dual boot on system. Everything was working fine till I updated my BIOS using windows. I can't see CentOS on startup. I have changed my hard drive to legacy ...
0
votes
1
answer
549
views
CentOS7 fails to start without monitor
When I used Windows 7 on the same PC, I didn't have this problem. Now I can't start my server if monitor is not connected. When I turn it on without monitor, I can't hear HDD loading and also can't ...
- 1,551
0
votes
1
answer
853
views
change root password in CentOS 7 [duplicate]
I was reading about changing root password in CentOS 7. it's totally different from centOS 6.
change root password
I was wondering about the steps for example why should I change ro? what ...
- 766