How Do You Troubleshoot the Kubernetes Problem “connection to the server localhost:8080 was refused”?

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One of the following applies (with #1 being related to Kubernetes anywhere and #2 only being relevant to running Kubernetes in GCP).

Problem scenario #1 (any Kubernetes)
You run a command like this: kubectl get svc

You get an error like this: The connection to the server localhost:8080 was refused – did you specify the right host or port?

What should you do?

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How Do You Troubleshoot a kubectl Command That Returns “The connection to the server localhost:8080 was refused – did you specify the right host or port?” when using AWS and EKS?

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One of the following problems pertains to you.

Problem scenario #1
You have a kubectl server. You created some new EKS clusters. How do you get the kubectl server to interface, control or manage the new EKS clusters.

or

Problem scenario #2
You are running EKS. You run this command:

kubectl get cluster-info

But you receive this message: “The connection to the server localhost:8080 was refused – did you specify the right host or port?”

What should you do?

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What Is Knowledge of Branching Strategies?

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Problem scenario
You are preparing for an interview for a job (build/release engineer or DevOps engineer) where a requirement is “knowledge of branching strategies.” There are different patterns, models, paradigms, workflows and even philosophies associated with branches in repositories. What is knowledge of branching strategies in the context of code versioning systems and the CI/CD pipeline?

Solution

***Updated in January of 2022.***

Background
Open source projects may have different branching strategies from enterprises developing in-house proprietary software.

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How Do You Troubleshoot the Ansible Playbook Error Associated with “[Errno 2] No such file or directory”?

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Problem scenario
When running an Ansible playbook using the java_cert module you receive an message “[Errno 2] No such file or directory”. How do you fix this?
(If you were using a file linking step in the playbook and not the java_cert module, see this posting.)

Solution
Use the “executable” attribute of the java_certs module (https://docs.ansible.com/ansible/latest/modules/java_cert_module.html) to specify the full path of the keytool file.

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What Are The Advantages of a Service over an Ingress in Kubernetes?

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Problem scenario
You have read that Ingresses have benefits compared to Services. You know the two are different for routing external traffic to reach a Kubernetes pod. When would you want to use a Service instead of an Ingress?

Possible Answers

  1. When you want to direct traffic to Pods based on a selector and not an IP address. Ingresses use IP addresses*,

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How Do You Find if Your EC-2 Servers Are in a VPC?

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Problem scenario
You want to know if your EC-2 servers are in a VPC or not. What do you do to determine if your EC-2 servers are in a VPC?

Possible Solution #1
To use the web console, see this external posting.

Possible Solution #2
This is a programmatic, character-based solution.

Prerequisite
This assumes that you have installed the AWS CLI.

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