A Technical I.T./DevOps Blog
Problem scenario
When you open a terminal or log into a Linux server, you see a message like this:
“mount: /foobar: must be superuser to use mount.”
You suspect some bash script is running every time you log in. What should you do?
Possible solution #1
If you are running a Red Hat server, go to /etc/profile.d/.
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Problem scenario
You run a website business. Where do you go to get an understanding about legal policies? You want to learn more about how to comply with Amazon’s Affiliate Marketing program’s policies. What do you do?
Solution
You can try termly.io for general policy information assistance. For Amazon’s Affiliate Marketing program specifically, see this external posting.
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Continue reading “Confused about Legal Policies for your Small Business?”
Problem scenario
You try to run an obs command. You get errors like these:
var/lib/snapd/snap/obs-studio/1195/usr/bin/obs: /lib64/libcurl.so.4: no version information available (required by /var/lib/snapd/snap/obs-studio/1195/usr/bin/obs)
/var/lib/snapd/snap/obs-studio/1195/usr/bin/obs: symbol lookup error: /var/lib/snapd/snap/obs-studio/1195/usr/bin/obs: undefined symbol: obs_get_module_lib
What should you do?
Solution
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Problem scenario
You try to run a DNF command, but you get stymied with errors like these:
Fedora 32 foobar (From SomeCompany) – x86_64 0.0 B/s | 0 B 00:00
Errors during downloading metadata for repository ‘fedora-somecompany-foobar’: – Curl error (77): Problem with the SSL CA cert (path? access rights?) for https://mirrors.fedoraproject.org/metalink?repo=fedora-somecompany-foobar-32&arch=x86_64 [error setting certificate verify locations:
CAfile: /etc/ssl/certs/ca-certificates.crt
CApath: /etc/ssl/certs]
Cannot prepare internal mirrorlist: Curl error (77): Problem with the SSL CA cert (path?
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Problem scenario
You have a white screen in the web browser. Why is the website just white when using HTML?
Possible Solution #1
Are the font and background color the same? If the font is set to be white, that may be the problem. HTML has hexadecimal codes for the font and background color; you can view them here: https://htmlcolorcodes.com/
Possible Solution #2
Is there a misspelling in the URL and the ultimate web page?
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Question
Is there a difference between an IAM role and an IAM access key?
Answer
Yes. To summarize this article, IAM users are for humans and IAM roles are for AWS components (such as S3 buckets and EC-2 instances). As a less significant difference, you do not rotate IAM roles (according to this medium.com post).
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Continue reading “Is There a Difference between an IAM Role and an IAM Access Key?”
Question
You have seen “MSK” in an article on the public cloud. Does the “K” stand for “Key”? What does MSK stand for?
Answer
MSK stands for “Managed Streaming for Kafka”. It is an Amazon product.
“Amazon Managed Streaming for Apache Kafka (Amazon MSK) is a fully managed service that enables you to build and run applications that use Apache Kafka to process streaming data.
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Problem scenario
You are using an Android phone. When you get new voicemails, there is no indication. What should you do?
Possible solution
Go to the settings in your phone (possibly through a sprocket/gear symbol). Go to Apps -Voicemail. Click on “Force stop” in the lower right hand corner. Allow it to stop. Then click “Open.” This may work.
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Continue reading “How Do You Get the Voicemail Indicator Icon to Work on an Android Phone?”
Problem scenario
You support an existing application and its servers. It is experiencing slowness as the users are complaining about its performance. What are some potential root causes of this slowness?
Possible Solutions
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Continue reading “What Can Cause an Application to Run Slowly?”
Question
You have heard about VPCs and subnets. What are the differences between these two?
Answer
A subnet is a subdivision of a network. Internal to an enterprise network, you may divide the network into different addresses with gateways, routers, bridges and subnet masks. The subnet mask (in CIDR (classless inter-domain routing) notation may be /28, /24, /10 etc.
A VPC ordinarily has its own NACLs and firewalls associated with it;
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Continue reading “What Is The Difference between a VPC and a Subnet?”