A Technical I.T./DevOps Blog
Problem Scenario
You have some GKE standard clusters that you want deleted. You try to delete them, but they do not go away. What should you do?
Solution
Root cause: Kubernetes clusters are self-healing. They are acting as they were designed. Once the instance group is deleted, you will be able to delete the instances via the web UI or via Google’s Cloud Shell.
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Continue reading “How Do You Delete VM Instances from GCP That Pertain to GKE?”
Problem scenario
You have two Linux servers in AWS, and each one has the same flavor (i.e., same amount of RAM and same number of processors). One is Ubuntu and another is SUSE. These commands will create working containers in Ubuntu:
docker run –name name1-mongo -d mongo
docker run –name name2-mongo -d mongo:2
This command will not create a working container in SUSE:
docker run –name name2-mongo -d mongo:2
The container that is created will never start.
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Continue reading “Why Would a MongoDB Container Work on an Ubuntu Host but Not a SUSE Host?”
Problem scenario
Many Azure commands are failing. You installed the Azure module. But commands related to “Azure Storage” all return “not recognized as the name of a cmdlet, function, script file or operable program.”
You see messages like this:
New-AzureStorageAccount : A parameter cannot be found that matches parameter name ‘ResourceGroupName’.
At line:4 char:25
+ New-AzureStorageAccount -ResourceGroupName “contIntGroup” -AccountNam …
+ ~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [New-AzureStorageAccount], …
Problem scenario
To trigger a Jenkins build after code is inserted into a Bitbucket repository, I have two options. I can use a Bitbucket plugin in Jenkins and do the configuration there. Or I can create a webhook in Bitbucket.
I tried both with a great deal of troubleshooting. But neither worked, and there was no error message. I found nothing in the logs. The triggering event clearly happened.
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Problem scenario
You have a Weebly website. You want a partial back-end back up of your website. What should you do?
Solution
1. Go to your Weebly Editor.
2. At the top, go to “Settings”
3. Scroll down to “Archive”
4. Enter your email address and click “Email Archive”
5. The email with have a link to download a portion of the website.
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Continue reading “How Do You Take a Partial Back Up of Your Weebly Website?”
This is a list of books focusing on message queuing solutions other than RabbitMQ. For RabbitMQ, see this link.
AMQP PREDICTIVE ANALYTICS REPORT by Gerard Blokdijk
ActiveMQ in Action by Bruce Snyder, Dejan Bosanac and Rob Davies
Code Connected Volume 1: Learning ZeroMQ by Pieter Hintjens
Programming WebSphere MQ with JAVA by Kunal Jaggi
ZeroMQ: Messaging for Many Applications by Faruk Akgul
ZeroMQ: Messaging for Many Applications by Pieter Hintjens
Updated 8/1/21
Problem scenario
An Ansible playbook appears to run with no errors or explicit failures. But the playbook is not working as you expect. There is no message indicating what could be wrong. What should you do to troubleshoot it so the intended effect(s) will happen?
Tips and Possible Solutions in Nearly Random Order
1. When you run the ansible-playbook command,
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Problem scenario
You prefer Python to Ruby for certain tasks, and you want to have a way of testing your configuration management tools. You want to use Testinfra to accomplish this (https://testinfra.readthedocs.io/en/latest/). You want to install Testinfra to test it out. What do you do?
Solution
Prerequisites
i. You must have pip3 installed on the server.
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Continue reading “How Do You Use Testinfra (the Python module)?”
Problem scenario
You have seen Python functions defined using the self keyword. You want to test it out. How do you do this?
Solution
First of all, self is NOT a keyword in Python. Yes, you should probably use the word “self” when it is invoked. This is a well-accepted convention. It may be an unwritten rule. But you do not need to use the word “self”.
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Problem scenario
You have some .eml files (e.g., emails from a web-based email account) that you want to view. How do you display them for free?
Solution
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