A Technical I.T./DevOps Blog
Problem scenario
You want to run some firewall-cmd commands. You see the flag –remove-port. Will it allow or block the given TCP/UDP port?
Answer
It will block connectivity on the port.
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Continue reading “Does Removing a Port with firewall-cmd Allow or Block Connectivity?”
Question
Given the obsolescence of information technology topics, should you hold on to study guides and books for years later as an investment?
Answer
Possibly. Sometimes one book that was published in 2010 can list for over $1,000. This book is RHCSA/RHCE Red Hat Linux Certification Study Guide (Exams EX200 & EX300) 6th (sixth) edition Text Only Paperback by Michael Jang.
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Continue reading “Should You Save Old I.T. Certification Study Guides?”
Problem scenario
You want to run some firewall-cmd commands. You see the flag –add-port. Will it allow or block the given TCP/UDP port?
Answer
It will allow connectivity on the port.
…
Continue reading “With firewall-cmd Does Adding a Port Allow or Block Connectivity?”
Problem scenario
You want to retrieve lines from a log file with the word “failed”. How do you do this with Python?
Solution
Assuming the log file is named “auth.log”, this will work:
log_reader = open(‘auth.log’, ‘r’)
for line in log_reader:
lower_line = line.lower()
if lower_line.find(“failed”) != -1:
print(line) …
Problem scenario
You are trying to remove curl with dnf or yum commands. You cannot do it because dnf or yum requires curl. What should you do to reinstall curl?
Solution
Prerequisites
You need make installed. If you need assistance with this, see this posting.
Procedures
Manually back up then delete curl.
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Continue reading “How Do You Force the Reinstallation of curl?”
Problem scenario
You have a web page with a table. It uses HTML and Javascript. You want only a sub-portion of the rows to be displayed and allow the user from the front-end to click a drop down menu to see more results. What should you do?
Possible Solution #1
Have two blocks in the .html file. Have the top one define a function that accepts a parameter and filters the table results if/when called.
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Problem scenario
You want to install a feature rich screen capture video software program that can record via a camera too. What do you do?
Solution
Prerequisite
Install snap: sudo dnf install snapd
sudo snap install obs-studio
# If you are using Fedora 32, run this command:
sudo dnf install http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-32.noarch.rpm
# If you are using a different version of Fedora, …
Continue reading “How Do You Install Open Broadcast Studio on Fedora Linux?”
Problem scenario
You try to run obs (Open Broadcaster Studio Software) on Fedora, but you get a message like this:
/var/lib/snapd/snap/obs-studio/1195/usr/bin/obs: error while loading shared libraries: libQt5Svg.so.5: cannot open shared object file: No such file or directory
What should you do?
Solution
Run this command:
sudo dnf install qt5-qtsvg …
Continue reading “How Do You Troubleshoot the Error Message “libQt5svg.so.5 cannot open”?”
Problem scenario
The built-in camera of your laptop or desktop is not working. What should you do?
Possible Solutions
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Continue reading “How Do You Troubleshoot a Computer Camera That Is Not Rendering Images?”
Problem scenario
You have installed Open Broadcaster Software. You know want to run the GUI application. What do you do?
Solution
From a terminal window, run this command:
sudo find / -name obs -type f
Run the file that is found as a command.
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