The exam was 4 hour long. I managed to finish all questions in 3 hours. Fortunately, I found a mistake in the last hour. I think the EX415 exam wasn’t too difficult and pretty confident that I did well. The most difficult part: not knowing what I did wrong. Or how the marker scripts would like to see our answers. I suspected there was a mistake in a question, but who to ask since there is a NDA?...
In my previous blog post, Managing File System Encryption with LUKS, I showed how to create an encrypted partition (of disk) using LUKS. Today, I’d like to show you how we can change the passphrase on this LUKS encrypted partition and keeping this passphrase (key) in the same slot. While I’m writing this blog post, I cannot remember how to do this, and I’m going to try to figure this out without doing the Google search....
Last year, I already wrote a blog post about the same topic: Configure Encrypted Storage With LUKS, and I had used fdisk to create a disk partition. In this post, I’ll use parted to achieve the same thing. I’m going to perform this operation on a server called servera on a disk device /dev/vdb. First, let’s verify that vdb is available and has no partition: [root@servera ~]# parted -l ... Error: /dev/vdb: unrecognised disk label Model: Virtio Block Device (virtblk) Disk /dev/vdb: 1074MB Sector size (logical/physical): 512B/512B Partition Table: unknown Disk Flags: Use parted to create a partition on vdb using the whole disk....
While preparing for my Red Hat Gluster Storage Administration exam (EX236), I got stuck at a section of configuring IP failover with CTDB Clustered Trivial Database) for Samba. The problem is that I coudldn’t get the ctdb service running on my home lab running CentOS 7 and a newer version of ctdb. This problem occurs on the following platform and package version: CentOS Linux release 7.7.1908 (Core) ctdb 4.9.1-6.el7 # systemctl status ctdb ● ctdb....
I’m currently preparing for the Red Hat Certified Specialist in Security: Linux exam (EX415). One of the exam objectives is about storage encryption using LUKS. Here’s my note learning about LUKS. It’s not meant to be a guide which you should copy and paste and run it on your production system. Suppose I have a new disk (/dev/vdb) attached to my server and I’d like to use it as an encrypted storage using LUKS....