A Technical I.T./DevOps Blog
Problem scenario
You want to use an Azure pipeline. You want it to perform a build. What should you do?
Solution
Prerequisites
i. You must have a supported code versioning system with certain files. As of 10/7/19 the options are Azure Repos Git, Bitbucket Cloud, GitHub, GitHub Enterprise Server, other Git repositories or Subversion. If you follow steps 1 through 4 of How Do You Build a Java Program with Maven?
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Continue reading “How Do You Create a Build Pipeline in Azure?”
Problem scenario
You want a program to test if two words are anagramous with each other. You want the test to be case insensitive. How do you write a program that will interactively prompt the user for two different words and test if they are anagrams?
Solution
Use this Python 3 program (and it will interactively prompt you to enter two words):
word1 = input(“Enter one word: “).lower()
word2 = input(“Enter a second word: “).lower()
wL1 = list(word1)
wL2 = list(word2)
wL1.sort()
wL2.sort()
if (wL1 == wL2):
print(“The two programs are anagrams!”)
else:
print(“The two words are NOT anagrams!”)
It will not work with Python 2.
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Continue reading “How Do You Write a Python Program to Test If Two Words Are Anagrams?”
Problem scenario
You want to use Maven to build a Java program from source code. The code is in at least two different .java files. How do you run Maven to compile a .java file?
Solution
Prerequisites
This assumes that you have installed Maven. If you need assistance, see this posting.
Procedures
1.
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Continue reading “How Do You Build a Java Program with Maven?”
Problem scenario
You want to deploy the Spring framework with Docker. How do you do this?
Solution
Warning: The last step in this is not a security “recommended practice.” Only follow these directions (with sudo docker run…), if the server is not that important or you are in a very secure network. One published book says you can use “sudo docker …” as long as the server is not in production (page 43 of Docker Up and Running).
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Continue reading “How Do You Install Spring Framework with Docker?”
Problem scenario
You have a multi-node Hadoop cluster running Hadoop version 3. You run this command: hdfs dfsadmin -report
You receive an error that includes this message: “failed on connection exception: java.net.ConnectException: Connection refused; “
What should you do?
Potential Solution
Run these three commands:
bash /usr/local/hadoop/sbin/stop-dfs.sh
hdfs namenode -format
bash /usr/local/hadoop/sbin/start-dfs.sh
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Question
What is a Secret in Kubernetes?
Answer
It is a ConfigMap with sensitive data that is encoded in Base64 text. What is a ConfigMap? It is a .yaml with a special format. There is always a “data:” section that is part of the YAML definition of a ConfigMap. The key-value pairs in the “data” section will have keys that appear in regular text;
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Problem scenario
You run this command: kubectl get svc
You receive this:
” could not get token: NoCredentialProviders: no valid providers in chain. Deprecated.
For verbose messaging see aws.Config.CredentialsChainVerboseErrors”
What should you do?
Solution
Install and configure the AWS CLI. If you need assistance with this, see this posting.
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Question
In Kubernetes you have heard of these things: service, deployment, HPA, pod, ingress, secret, configmap, and node. What are they?
Answer
Click on the relevant question for its answer:
What is a Secret in Kubernetes?
What is a ConfigMap in Kubernetes?
What is a Deployment in Kubernetes?
What is an Ingress Resource in Kubernetes?
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Problem scenario
You want to use Azure’s Kubernetes PaaS offering using the GUI. What do you do?
Solution
1. Sign into the Azure portal.
2. Click on “Services” on the left.
3. Click on “Containers”.
4. Click on “Kubernetes services”.
5. Click “Add”.
6. Fill out the required fields.
7. Click the “Review + create” button.
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Continue reading “How Do You Deploy AKS (Azure’s Kubernetes) Using the GUI?”
Question
AWS’s Five Pillars of Well-Architected Framework recommend monitoring as a component of three of the pillars (operational excellence, reliability and performance efficiency).
There is no question that monitoring is important inside or outside of a public cloud. What patterns or traits might a good centralized monitoring system have (consistent with some phrase as “best practices”)?
Answer
Here are 15 characteristics of good monitoring.
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Continue reading “What Are the Recommended Practices of Monitoring?”