A Technical I.T./DevOps Blog
Problem scenario
You want to set up Apache Kafka with a single broker just to test out. How do you do this on any distribution of Linux?
Prerequisite
You must install Zookeeper. If you need assistance, see this posting.
You may want to install screen because this solution will rely on it; you could open duplicate terminals instead of using the screen command.
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Continue reading “How Do You Set Up Apache Kafka on Any Distribution of Linux?”
Problem scenario
You want to create an AWS S3 bucket using the AWS CLI. What do you do?
Solution
Prerequisite
This assumes that you have installed the AWS CLI. If you need assistance, see this posting.
Procedures
Run a command like this but replace “foobar” with the unique name of an s3 bucket that other people will see.
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Continue reading “How Do You Create an AWS S3 Bucket via the AWS CLI?”
Problem scenario
You have heard of namespaces in programming, DNS, AWS, operating systems, and in the context of managing containers. You want to see the disambiguation of of this term insofar as computing is concerned. What are namespaces in I.T.?
Overview
Names can be bound to different spaces (or subsystems), and this binding varies depending on the technology. Namespacing helps facilitate locally unique identification/resolution of names.
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Problem scenario
You have a non-business project (e.g., a non-commercial, non-professional, non-work-related project). You need to combine individual JPEGs and PDFs into one PDF. How do you do this?
Solution
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Continue reading “How Do You Merge Three Files (.jpegs and PDFs) into One PDF?”
Problem scenario
Without creating a hard or soft link of a file, how do you set an environment variable for every user after every reboot?
Solution
JAVA_HOME=/usr/bin/java
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JP Morgan is viewing Bitcoin more favorably according to this Forbes article. If you would like to learn more about Bitcoin, you may want to see this article. If you want to buy Bitcoin or a variety of cryptocurrencies, try Changelly.
If you want to receive free cryptocurrency by just learning more, try Coinbase; it is ideal for Americans.
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Question
What is a second generation configuration management tool?
Answer
Page xiii of The DevOps Handbook refers to John Willis characterizing Luke Kanies’ thoughts on configuration mangaement as “second generation CM.” But according to https://www.cmcrossroads.com/article/cm-generations-and-vision-future there are four generations of CM. This may or may not be compatible with what John Willis hand in mind,
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Problem scenario
You used a .json file and the AWS CLI to configure customized metrics. When you go to the GUI you do not see the graphs. The commands that were run with the .json file completed without errors or problems. How do you get the web console to show the metrics you configured for various AWS components?
Possible Solution #1
CloudWatch metrics are not all necessarily graphed.
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Continue reading “What Do You Do If CloudWatch Metrics Are Not Showing Up in the Dashboard?”
Problem scenario
You run an aws ec2 command and you get use the –filters flag with Name=VolumeId (consistent with the casing that you see in other AWS CLI contexts). You receive a message about “the filter VolumeId” being invalid. What should you do?
Solution
Use “volume-id” instead of “VolumeId”.
In general we find that the syntax of the name itself,
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Continue reading “How Do You Troubleshoot “The filter VolumeId” is invalid?”
Problem scenario
A user has no access to a VPC from her workstation. What are three ways a user can be given access to resources in a VPC?
Four Possible, Independent Solutions
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