Zypper is a command line package manager for installing, updating and removing packages as well as for managing repositories.
Month: April 2018
Rename existing screen sessions.
screen -S SESSIONNAME. When creating a new session, this option can be used to specify a meaningful name for the session. This name identifies the session for “screen -list” and “screen -r” actions.
If you already started a session and later decide to name it.
Enter to a command mode (Ctrl+a, :) and then type sessionname SESSIONNAME.
Creating virtual disks using dd and losetup.
To create an image file, in this case a “virtual disk”, use “dd” command. The below command will write zeros to a file of a specified size.
dd if=/dev/zero of=1GB_disk.img bs=1M count=1024
Once completed, a partition can be created using cfdisk or fdisk command. Then the filesystem should be created using mkfs.ext4
cfdisk 1GB_disk.img
Now, you can proceed to setup a loop device for you image. This requires the use of “losetup”. This command will assign an available loop device (-f option to find one) to the partition on the image, and show the name a loop device (–show option):
losetup -Pf --show 1GB_disk.img
If successful, you should be able to access the partition by mounting the image.
[root@s1 disk]# lsblk|grep loop
loop0 7:0 0 1G 0 loop /mnt/disk
[root@s1 disk]#
mount /dev/loop0 /mnt/disk
[root@s1 disk]# df -hP /mnt/disk/
Filesystem Size Used Avail Use% Mounted on
/dev/loop0 976M 46M 863M 6% /mnt/disk
[root@s1 disk]#
To remove a loop device just run:
losetup -d /dev/loop0