A Technical I.T./DevOps Blog
Problem scenario
You want to create your own Dockerfile. You also want to invoke reserved words such as FROM, RUN, COPY, WORKDIR, ADD, and LABEL. You want to then create a Docker image from it. You want to ultimately create a working Docker container from that image. How do you do all of this?
Solution
1. In a given directory,
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Problem scenario
You run a Maven command but you get this:
“Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Could not find artifact com.sun:tools:jar:1.8.0 at specified path /usr/lib/jvm/java-8-openjdk-amd64/jre/../lib/tools.jar:
You are running Ubuntu or Debian Linux. What should you do?
Solution
Run this: sudo apt install default-jdk
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Problem scenario
You are using a web browser and some items in a list are indenting where you do not want them indented. How do you make them line up with the other items in the list without indentation?
Solution
Bitbucket’s rendering of a text file does an auto-indent for natural numbers (with no sub-numbering scheme). If you have this in a file,
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Continue reading “How Do You Change the Indentation of the GUI-Rendering of a File in Bitbucket?”
Problem scenario
You run a Maven (mvn) command. But you receive an error like this:
[INFO] Scanning for projects…
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Malformed POM /home/jdoe/b/gs-maven/initial/src/pom.xml: Unrecognised tag: ‘dependency’ (position: START_TAG seen …\n \n \n … @17:17) @ /home/jdoe/b/gs-maven/initial/src/pom.xml, line 17, column 17
@
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project org.springframework:gs-maven:0.1.0 (/home/jdoe/b/gs-maven/initial/src/pom.xml) has 1 error
[ERROR] Malformed POM /home/jdoe/b/gs-maven/initial/src/pom.xml: Unrecognised tag: ‘dependency’ (position: START_TAG seen …\n \n \n … @17:17) @ /home/jdoe/b/gs-maven/initial/src/pom.xml, …
Problem scenario
You are trying to set up SonarQube for the first time. You run this command:
bash /opt/sonarqube/bin/linux-x86-64/sonar.sh console
You see this error:
“jvm 1 | java.nio.file.AccessDeniedException: /opt/sonarqube/temp/conf/es/elasticsearch.yml”
What do you do?
Solution
Make sure that the user who is running the command has the ability to execute files in the /opt/sonarqube/ directory (or wherever the destination is that you are installing Sonarqube).
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Continue reading “How Do You Get around The AccessDeniedException Error with SonarQube?”
Problem scenario
You run a command like this:
gcloud container clusters get-credentials standard-cluster-1 –region us-central1-a
But you receive one of the following messages:
“Fetching cluster endpoint and auth data.
ERROR: (gcloud.container.clusters.get-credentials) ResponseError: code=403, message=Request had insufficient authentication scopes.”
ERROR: (gcloud.projects.describe) User [123456789-compute@developer.gserviceaccount.com] does not have permission to access projects instance [123456789] (or it may not exist): Request had insufficient
authentication scopes.
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Problem Scenario
You are using Jenkins and its Credentials plugin. You are not sure if the syntax of the username and password are correct. You think that there may be a wrong username or password. You want to see how things look as they are used in a pipeline job. The console output shows the credentials as “****”. What should you do?
Solution
Warning: this is not a recommended practice.
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Problem scenario
You want to install Tiller to complement Helm. What should you do?
Solution
Prerequisite
Install and configure Helm with Kubernetes. If you need assistance with this, see this posting.
Procedures
Run this command:
helm init
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Problem scenario
You want to use Azure’s PaaS for Kubernetes without using a web UI. What do you do?
Solution
Warning: this will cost money. This will create resources in Azure.
Prerequisites
i. You have the Azure CLI installed. If you need assistance with this, see How Do You Install the Azure CLI on a Debian/Ubuntu Linux Server?
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Problem scenario
You want to generate 10,000 random numbers in a tuple. That is, you want a tuple with 10,000 numbers. The numbers can be chosen at random. How do you do this?
Solution
See this posting first and follow it: How Do You Generate 10,000 Random Numbers in a list in Python?
See this posting second and follow it: How Do You,
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Continue reading “How Do You Generate 10,000 Random Numbers in a Tuple in Python?”