A Technical I.T./DevOps Blog
Problem scenario
You want to install Rust on Linux (e.g., SUSE, Debian/Ubuntu or CentOS/RHEL/Fedora).
Solution
sudo curl –proto ‘=https’ –tlsv1.2 -sSf https://sh.rustup.rs | sh
Choose “1” and press enter.
2. Run this command:
source $HOME/.cargo/env …
Continue reading “How Do You Install Rust on Any Distribution of Linux?”
Problem scenario
You seem to have two versions of a website being hosted. When you log into WordPress and make changes, they aren’t taking effect. You notice that the website you have is duplicated with one older version and one newer version. Both are hosted. You use a VPN or proxy tunnel website and find differences in your website. You want to consolidate these. How do you find out what is going on?
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Problem scenario
You are running EKS in AWS. You get this message “Warning FailedScheduling … default-scheduler no nodes available to schedule pods”. How do you troubleshoot it?
Solution
Verify your nodes are healthy with this command: kubectl get nodes
If you are using EKS, you may need to create nodes. Here is a command to do that (but replace “foo” with the name of the EKS cluster that you have,
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Question
How is a process different from a daemon in Linux?
Answer
A process subsumes a daemon. A daemon is a process that runs for a long period of time (e.g., the duration the server is on). It may require no interaction with a user. A logging process or a web service like Nginx are examples of daemons.
This answer was paraphrased from page 34 of The Linux Programming Interface.
…
Continue reading “How Is a Process Different from a Daemon in Linux?”
Problem scenario
You have read about decorators in object-oriented programming and in Python. Is there a disambiguation of what a decorator is?
Solution
In object-oriented programming, inheritance allows for an object to change from its class at compile time (according to page 201 of Programming Interviews Exposed). In OOP, the decorator pattern is a structural design pattern (according to the inside of the front cover of Design Patterns) and is a way to modify an object in OOP at run-time (according to page 201 of Programming Interviews Exposed).
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Problem scenario
You want all the emails in your gmail account to be saved. You want the text of the messages searchable, and you want to save the attachments. How do you do this?
Solution
…
Continue reading “How Do You Save All the Emails in Your Gmail Account Locally?”
Problem scenario
You run “vagrant up”, but you get one of the following error messages:
The box you’re attempting to add doesn’t support the provider
you requested. Please find an alternate box or use an alternate
provider. Double-check your requested provider to verify you didn’t
simply misspell it.
If you’re adding a box from HashiCorp’s Vagrant Cloud, make sure the box is
released.
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Problem scenario
You run a grep command but it fails. You get a message about “memory exhausted.” What should you do?
Solution
Possible Solution #1
If you are comparing two files line-by-line, try reversing the order of the file arguments for the grep command. For example try these two versions:
grep -f a.txt b.txt
grep -f b.txt a.txt
If the file in the left argument is smaller,
…
Continue reading “How Do You Fix the Error “grep: memory exhausted”?”
Terraform: Up & Running: Writing Infrastructure as Code by O’Reilly Media
Terraform Cookbook: Efficiently define, launch, and manage Infrastructure as Code across various cloud platforms by Packt Publishing
Infrastructure as Code: Managing Servers in the Cloud by O’Reilly Media
Learning DevOps: The complete guide to accelerate collaboration with Jenkins, Kubernetes, Terraform and Azure DevOps by Packt Publishing
Terraform: Up and Running: Writing Infrastructure as Code by O’Reilly Media
HashiCorp Certified: Terraform Associate Practice Test
The Terraform Book by Turnbull Press
Problem scenario
You are running Vagrant to create a VM on Oracle VirtualBox. You are given a prompt after your “vagrant up” command:
“Which interface should the network bridge to?”
No option seems to work. You have used a variety of different names, GUIDs, syntaxes, etc. What should you do?
Solution
Use “1)” or “2)” or any of the integer values listed above the question.
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