Thursday, November 8, 2018

Fedora 29 : System Storage Manager tool.

This Linux tool comes with this intro:
System Storage Manager provides an easy to use command line interface to manage your storage using various technologies like lvm, btrfs, encrypted volumes and more.
Today I will show an easy way to fix the size of your size of the volume and the file system.
Fist you need to install it with dnf tool :
[root@desk mythcat]# dnf install system-storage-manager
Last metadata expiration check: 1:11:16 ago on Thu 08 Nov 2018 08:04:29 PM EET.
Package system-storage-manager-1.2-1.fc29.noarch is already installed.
Dependencies resolved.
Nothing to do.
Complete!
Use this command to fill up to 100%:
[root@desk mythcat]# ssm resize -s +100%FREE /dev/mapper/fedora-root 
Display the information about all detected devices, pools, volumes, and snapshots, see:
[root@desk mythcat]# ssm list
-------------------------------------------------------------
Device        Free       Used      Total  Pool    Mount point
-------------------------------------------------------------
Check the file system consistency on the volume ( this cannot be use with swap ).
[root@desk mythcat]# ssm check
You can read more about this tool here.

Monday, November 5, 2018

Fedora 29 : the new Fedora 29.

It has been announced for some time to launch Fedora.
Today I have appeared on the interface the possibility to change the old Fedora 28 to Fedora 29.
The interface appeared and I had to click the Download button and then the Install button.
The download process was fast. If you do not have enough disk space then the installation will not work.
After you click the Install button, the installation process will take care of the installation.
Finally, a reset of the distribution will start the new Fedora 29.
I have not found any irregularities or operating problems.
From now on, my posts, tests, and tutorials will be with Fedora 29.

Friday, November 2, 2018

Fedora 28 : Create a ISO image with stage2 and kernel ELF .

The tutorial for today solves the problem of creating an ISO image.
This image can be run and test with QEMU tool emulator like any ISO CDROM image.
You can build your kernel with any assembler and use this steps to test it.
I used the FASM assembly tool. Into my fasm folder I create these folders:
[mythcat@desk fasm]$ mkdir -p iso/boot/grub
You need a stage2 file known like: stage2_eltorito.
This file uses the El Torito is a specification for bootable CD using BIOS functions.
The GRUB supports the no emulation mode in the El Torito specification.
El Torito file booting begins by the Boot Record of the ISO 9660 filesystem at block address 0x11.
You can get this file from your Linux distro of you can find installed into old GRUB.
Put this file into grub folder:
[mythcat@desk fasm] cp /usr/lib/grub/i386-pc/stage2_eltorito  iso/boot/grub/
Use fasm tool with your kernel and use this commands to create the ISO file:
[mythcat@desk fasm]$ ./fasm kernel.asm 
flat assembler  version 1.73.04  (16384 kilobytes memory)
2 passes, 16756 bytes.
[mythcat@desk fasm]$ cp kernel.o iso/boot/kernel.k
[mythcat@desk fasm]$ cat > iso/boot/grub/menu.lst << EOF
> default 0
> timeout 1
> title fasm multiboot
> kernel /boot/kernel.k
> EOF
[mythcat@desk fasm]$ genisoimage -R -b boot/grub/stage2_eltorito -no-emul-boot -boot-load-size 4
 -boot-info-table -o mykernel.iso iso

I: -input-charset not specified, using utf-8 (detected in locale settings)
Size of boot image is 4 sectors -> No emulation
Total translation table size: 2048
Total rockridge attributes bytes: 920
Total directory bytes: 4096
Path table size(bytes): 34
Max brk space used 24000
241 extents written (0 MB)
Now you can test the result:
[mythcat@desk fasm]$ qemu-system-i386 -cdrom mykernel.iso
This is result of my kernel: