Situation: I want to re-use an external drive which already contains some data. So I will create a disk image on an external drive in case I need to copy that image back to the drive in the future. Solution: Normally, I just run dd to create an file.img when the disk is small, e.g. SD card. However, the drive capacity is 512GB. So a better option is to compress the image....
I’m trying to create an XFS filestem on a used disk, and got into a problem. Here is the error message: # mkfs.xfs /dev/sda1 mkfs.xfs: cannot open /dev/sda1: Device or resource busy So, let’s see if I can fix it. (Spoiler alert: I think I can, even though it’s not yet done at the time of this writing.) Let’s check the partitions of /dev/sda: # parted /dev/sda print Model: ATA ST1000LM014-1EJ1 (scsi) Disk /dev/sda: 1000GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Disk Flags: Number Start End Size File system Name Flags 1 1049kB 512GB 512GB ntfs 1 So, there is a partition (/dev/sda1) with 512GB in size, and its filesystem is ntfs....
It’s quite annoying when I know the command I can use to copy the content on a terminal to clipboard. I know, I can run man xclip, but I think it’s still easier for me to visit this page and see how to do it. For example, I want to copy the content of my ssh keypair, ed2559.pub, to clipboard, and here how it can be done: ➜ xclip -sel clip < ~/....
Well, I hardly need to activate or deactivate LVM volume groups. But when I do, I also hardly remember the command required to do that. So hopefully, I can refer to this post should I need to perform one of these tasks in the future. Since a volume group is activated by default when it is created, let’s start with a command to deactivate it. # vgchange -a n example_volume_group Like wise, to activate a volume group, use the following command:...
This is a short note on how to unlock admin account for FreeIPA. # kinit admin kinit: Client’s credentials have been revoked while getting initial credentials When too many incorrect password attempts are made, the admin account is locked out. To unlock it, perform the following on the FreeIPA server: # ldapmodify -x -D "cn=directory manager" -W Enter LDAP Password: dn: uid=admin,cn=users,cn=accounts,dc=example,dc=com changetype: modify delete: krbLoginFailedCount To process the modification enter Control-D....