A Technical I.T./DevOps Blog
Problem scenario
A user in Azure DevOps cannot approve releases to a given environment. The permissions are correct; the user is a member of the relevant custom security group in the project. Why can’t the user approve the deployment to an environment?
Solution
Can the user go to the Azure DevOps organization? Can the user also see the project? The organization subsumes a project,
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Continue reading “Why Cannot a User Approve a Release Pipeline to an Environment?”
Problem scenario
The nodes in a Kubernetes cluster are not working. What should you do?
Possible Solution #1
Run this command: kubectl get nodes
For the node that is not healthy, assuming its hostname is called “foobar”, run this command: kubectl describe node foobar
Possible Solution #2
If you have pods and no nodes (which could be the case),
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Problem scenario
You are trying to run a Hadoop job. You get this error:
“java.io.IOException: Stream closed at java.base/java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:442)”
What should you do?
Solution
Is the “python” command recognized as such? You may need to install Python or link the python3 binary to be in a typical location where env variables would look for it (e.g., /usr/bin/python).
Here are commands that could help you:
whereis python3
sudo ln -s python3 /bin/python
If you need help installing Python,
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Problem scenario
You are using GitHub Enterprise. You want to see the details of a user’s permissions (e.g., when it was created or before someone modified the user’s ability to control repos). What do you do?
Solution
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Problem scenario
Using a MacOS, you are trying to run a command (e.g., a “java” command) from the Terminal utility (character prompt). You get the message “No Java runtime present”, and the command fails. What should you do?
Solution
Using the GUI, download the .dmg file from here.
Once it is downloaded, double click it. Follow the menu steps (Continue ->
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Continue reading “How Do You Solve the MacOS Command Line Error “No Java runtime present…”?”
Problem scenario
You want to rotate AWS IAM keys across a unique set of different AWS accounts. Regular rotation is a recommended practice for securing your AWS resources (per this Amazon posting). Just as passwords can be brute-forced and defeated through exhaustive attempts, access keys could be randomly generated and attempted via a malicious person or program; rotating the access keys can make hacking your AWS resources tremendously more difficult.
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Continue reading “What Are Eight Ways of Rotating AWS IAM Keys?”
Problem scenario
You are searching GitHub for a file by its name. But for some reason it is not showing up in the results. What should you do?
Solution
Use the “filename:” option in the search terms before the name of the file you are looking for.
org:coolorgname filename:rio.yml
For some reason this “filename:” option returns more results. (This solution is supported by https://stackoverflow.com/questions/18991908/is-it-possible-to-search-for-a-particular-filename-on-github.)
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Continue reading “How Do You Find a File by Name in GitHub (when it is not otherwise showing up)?”
Problem scenario
You want to install the inspec gem. What do you do?
Solution
Run this:
gem install inspec
(Taken from https://mitre-inspec-developer.netlify.app/installation/linuxinstall.html )
Does the inspec-bin command work? This may be a newer version that is already installed.
If you installed Ruby with root, which is not recommended according to https://stackoverflow.com/questions/24706277/error-sudo-gem-command-not-found, you may need to use “sudo” before the gem command.
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Continue reading “How Do You Install “inspec” with gem from the Command Line?”
Problem scenario
You run a kitchen or molecule command. It fails with an error about ports. What should you do?
Solution
Find what other machines are running in your VPC. This error message seems to be relevant to Vagrant (because if you google it, you will see Vagrant-related postings). If you are using Vagrant, run this command: vagrant global-status
If you are not using Vagrant,
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Problem scenario
There is a process listening on a TCP port on your Linux system. How do you end it?
Solution
Assuming you want to terminate the process 5555, this is how you would find the PID:
sudo lsof -i :5555
To kill the process, the output of the above command will show you a PID. Run this command where 111222333 is the PID number you found above:
sudo kill -9 111222333 …
Continue reading “How Do You Terminate a Process Listening on a Given TCP Port?”