This note is, again, for me to remind myself in case I couldn’t recall how to do this in the future. To remove a storage domain from the cluster, use the following steps: Click Storage -> Domains Click on the name of the storage domain to open the details view Click on the Data Center tab Click on Maintenance button, then click on OK The Detach button becomes active, click on it. Click on Remove Reference: ...
On Fedora based system, whenever I need help writing a cron task and confused which field is minute, hour, day,..etc, I usually check the /etc/crontab file. ❯ cat /etc/crontab SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin MAILTO=root # For details see man 4 crontabs # Example of job definition: # .---------------- minute (0 - 59) # | .------------- hour (0 - 23) # | | .---------- day of month (1 - 31) # | | | .------- month (1 - 12) OR jan,feb,mar,apr ... # | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat # | | | | | # * * * * * user-name command to be executed Recently, I found an online cron scheduler editor - crontab.guru. It can be used to create a new task expression, or we can use it to verify the existing cron schedule expressions that we have. ...
Another month, another Red Hat exam has been ticked off the list. This time, it’s about the Red Hat Virtualization, a technology based on oVirt. The code name of the exam is EX318, and as rumours has it, it’s one of the easiest Red Hat exams; I can’t agree more. The exam’s duration is 3 hours; it’s a hand-on closed book exams. The exam is based on Red Hat Virtualization version 4.3. ...
I like to keep the firmware running on all my devices up to date. New firmware is released to do to main things: fixing bugs and feature enhancing. Today, I just found out that the modem/router provided by my ISP is running and out of date firmware. The installed firmware is NF18ACV.NC.AU-R6B016.EN released on 2018/05/14. There have been a few new versions of firmware released between then and now, with the latest version being: NC2-R6B021 released on 2020/11/26. ...
I have a FreeIPA server with the following information: FreeIPA server: utility.lab.example.com FreeIPA realm: LAB.EXAMPLE.COM FreeIPA domain: lab.example.com I want to add 2 normal users: User Login: rhvadmin, First Name: RHV, Last Name: Admin, Password: CentOS123^ User Login: normaluser, First Name: Normal, Last Name: User, Password: CentOS123^ [root@utility ~]# ipa user-add rhvadmin --first RHV --last Admin --password Password: CentOS123^ Enter Password again to verify: CentOS123^ --------------------- Added user "rhvadmin" --------------------- User login: rhvadmin First name: RHV Last name: Admin Full name: RHV Admin Display name: RHV Admin Initials: RA Home directory: /home/rhvadmin GECOS: RHV Admin Login shell: /bin/sh Principal name: rhvadmin@LAB.EXAMPLE.COM Principal alias: rhvadmin@LAB.EXAMPLE.COM User password expiration: 20201204121711Z Email address: rhvadmin@lab.example.com UID: 1829600001 GID: 1829600001 Password: True Member of groups: ipausers Kerberos keys available: True [root@utility ~]# ipa user-add normaluser \ > --first Normal --last User --password Password: CentOS123^ Enter Password again to verify: CentOS123^ ... The rhvadmin will be asked to change the password on its first login. To prevent this from happening, we can change the user’s password with kpasswd util. ...