A Technical I.T./DevOps Blog
Problem scenario
You try to start the Docker service (e.g., with sudo systemctl start docker). You get this error: “Failed to start docker.service. Unit docker.socket is masked”
What should you do?
Possible solution #1
sudo systemctl unmask docker.socket
sudo systemctl unmask docker.service
This solution was adapted from this blog.
Possible solution #2
Uninstall Docker.
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Continue reading “How Do You Fix “Failed to start docker.service. Unit docker.socket is masked”?”
Problem Scenario
You have some rectangular icon image files that are advertisements. You want to post them for your advertiser in your WordPress website. What should you do?
Possible Solution #1 (if you can provide CSS code)
1. Log into WordPress
2. Appearance -Themes
3. Find which theme is active and click “Customize”.
4. Click “Additional CSS”
5.
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Continue reading “How Do You Place Advertisement Banners in Your WordPress Website?”
Problem scenario
You want to know about the FHS in Linux. You see the /media directory (aka partition). What usually goes into /media?
Answer
CD-ROMs, DVD-ROMS, floppy disks etc. It is an optional directory that some Linuxes don’t have. Page 212 of CompTIA Linux+ Complete Study Guide (by Roderick W. Smith published in 2010) by Sybex has more information
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Continue reading “What Typically Goes into /media in Linux?”
Problem scenario
You run java commands but you get the error “/usr/bin/java no such file or directory.” What should you do?
Possible Solution #1
Reinstall Java.
Possible Solution #2
You may have deleted a linked file. To find the destination file, run this:
sudo find / -name java -type f
Based on the results,
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Continue reading “How Do You Troubleshoot “/usr/bin/java no such file or directory”?”
Problem scenario
You want to learn what signals your Linux server has (such as hang-up, interrupt, stop, kill etc.). How do you list the signals that are available to you?
Solution
Run this command:
fuser –list-signals …
Continue reading “How Do You Know What Signals Your Linux Server Supports?”
Problem scenario
You have heard about type 1 and type 2 companies. What are the differences?
Solution
We think that they are modes rather than types.
Gartner uses a word called “bimodal” to describe different patterns in the I.T. industry. Mode 1 refers to highly regulated environments whereas mode 2 refers to experimental, bleeding-edge environments. Thus a financial institution with private records would be an example of a mode 1 business.
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Problem scenario
You want your entire hard disk to have encryption. You want to install Ubuntu Linux with partitions. What do you do?
Solution
Follow these directions, but make sure the second partition (with GRUB) uses 80 MB. To do this, mentally find this command “sgdisk –new=2:0:+2M $DEV” here:
https://help.ubuntu.com/community/Full_Disk_Encryption_Howto_2019
When you get to that command,
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Problem scenario
You are using WordPress and you want to change the icon that your website has (e.g., in a tab of a web browser). How do you change the website’s icon when you use WordPress?
Solution
1. Log into WordPress
2. Appearance -Themes
3. Find which theme is active and click “Customize”.
4. Click “Site Identity”
5.
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Problem scenario
You have heard of bottom-up programming and top-down programming. How are the two types different?
Solution
A bottom-up programming approach involves composing small sub-solutions into a bigger whole solution. There is an integration of components to make a whole with bottom-up programming. This method can be difficult to create the final, coherent product.
A top-down programming approach involves decomposing a big problem into smaller fragments.
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