A Technical I.T./DevOps Blog
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.
…
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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Problem scenario
You are designing a Flask application with Python running some long-running processes. You want to handle the requests asynchronously. The individual requests will have a duration of more than one hour. What is the recommended way of handling this?
Solution
Use a task queue like Celery or RQ (Redis Queue).
Sources:
https://stackoverflow.com/questions/42790362/how-to-handle-long-sql-query-in-flask
Problem scenario
You want to extend Kubernetes’ functionality. You want to use CustomResourceDefinitions. You can view API resources by running “kubectl api-resources”. You want to add to the list. How do you use a CRD?
Solution
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
name: contintexamples.continualintegration.com
spec:
group: continualintegration.com
names:
kind: ContintExample
plural: contintexamples
listKind: ContintExampleList
singular: contintexample
scope: Namespaced
versions:
– name: v1
# Each version can be enabled/disabled by Served flag. …
Continue reading “How Do You Use Custom Resource Definitions in Kubernetes?”
Question
When you have high availability of servers, you have seen diagrams with a “sink” server. What does the word “sink” signify?
Answer
A sink, homophonic with “sync”, is a secondary server in a cluster or replication configuration. That is, there is a primary server that is actively processing transactions of databases or registering changes to files. This primary server may replicate changes over to a secondary or sink server.
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Problem scenario
From a Python command line, you get this message:
Traceback (most recent call last):
File “”, line 1, in
ImportError: No module named ‘pandas’
What should you do?
Solution
Prerequisite
You need pip to be installed. If you need assistance, see this posting.
Procedures
Run one of these commands:
pip install pandas
pip3 install pandas …
Continue reading “How Do You Troubleshoot “ImportError: No module named ‘pandas’”?”