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RedHat10/TemplateVM.

1- Installation	2- Network	3- Firewall	4- Selinux
5- Logs	6- Certificates	7- PassphraseSSH	8- Sudo
9- GnomeShell	10- Volumes	11- Proxmox	12- Troubleshoots

10. Logical volume.

10.1 Increase the size of the var volume.

vgdisplay displays the available space on the logical volume group.
vgdisplay

Alloc PE / Size       5632 / 22,00 GiB  
Free  PE / Size       3302 / <12,90 GiB  

You have 12,90 G available for logical volumes.

Example:
/dev/vgl0/var needs +4G.

lvextend -L+4G /dev/vgl0/var
resize2fs /dev/vgl0/var
df -h

/dev/mapper/vgl0-var        7,8G    166M  7,3G   3% /var  

Refreshing the free space of the logical volume group.

vgdisplay

Alloc PE / Size       6656 / 26,00 GiB  
Free  PE / Size       2278 / <8,90 GiB  

You have 8,90 G available for logical volumes.

10.2 Reduce the size of the var volume.

To shrink a volume, you must unmount it.
This is impossible if this volume is in use by the system.

For me, shrinking is possible for :

• /var
• /var/log
• /usr/local
• /home
• /opt

For the root /, you must boot the VM from "live AlmaLinux".

Example:
/dev/vgl0/var reduce 4G.
If you have installed gnome-shell.
Restart without the graphical interface.
systemctl set-default multi-user.target.
Unmount the mount points /var and /var/log.
vi /etc/fstab
Put # before theses lines.

#UUID=d10a8cb2-4d06-482c-90de-b15caa1bba55 /var                    ext4    defaults        1 2  
#UUID=257c5685-02cd-466c-91e0-0d86280914b6 /var/log                ext4    defaults        1 2  

reboot

Check a Linux ext4 file system.
e2fsck -f /dev/mapper/vgl0-var
resize2fs /dev/mapper/vgl0-var 4G
lvreduce -L 4G /dev/mapper/vgl0-var

vi /etc/fstab
Delete # before theses lines.

UUID=d10a8cb2-4d06-482c-90de-b15caa1bba55 /var                    ext4    defaults        1 2  
UUID=257c5685-02cd-466c-91e0-0d86280914b6 /var/log                ext4    defaults        1 2  

systemctl daemon-reload

mount /dev/mapper/vgl0-var
mount /dev/mapper/vgl0-varlog

df -h

/dev/mapper/vgl0-var        3,9G    167M  3,6G   5% /var  

Refreshing the free space of the logical volume group.
vgdisplay

Alloc PE / Size       5632 / 22,00 GiB  
Free  PE / Size       3302 / <12,90 GiB  

You have 12,90 G available for logical volumes.

If you have installed gnome-shell.
Restart with the graphical interface.
systemctl set-default graphical.target
reboot

Useful command to kill processes on the volume.
fuser -kimuv /var/log
fuser -kimuv /var