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// Receiver arguments: https://tour.golang.org/methods/1
// Factory patterns:
// https://www.sohamkamani.com/golang/2018-06-20-golang-factory-patterns/
// https://stackoverflow.com/questions/49712313/golang-factory-method

package main

import "fmt"

type Instrument struct {

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Taints, tolerations and node affinity : the e-magnetism of Kubernetes Nodes in the Kube Scheduler

We can think of Node Affinity as analagous analogus to magnetic attraction;

We can think of Node Taints as the complement of that (magnetic repulsion);

We can think of the determinant of a Node's eventual location as being "up to the Kube scheduler.

That's why we'll often have an effect of NoSchedule for nodes we'll want an exception of sorts for.

• See Scheduling/Eviction: Taints and Tolerations.

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How to keep VSCode's Go Extension from removing Go imports while developing

We would think this would be enough for VSCode's Go Linter/formatter, but nopes:

{
  "editor.formatOnSave": false,
}

We instead need to do this:

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Open Source Reading Material

• https://steveklabnik.com/writing/the-culture-war-at-the-heart-of-open-source
• https://steveklabnik.com/writing/what-comes-after-open-source

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Kubernetes envtest

A testing environment for Kubernetes

Note: Everything mentioned here is also in the Controller Runtime's pkg envtest docs.

envtest can run on a local control plane, or an existing cluster.

• To start up a local control plane, envtest spins up a local instance of control plane binaries. These would be, etcd and kube-apiserver. It's available as a package under controller-runtime.
• Alternatively, an existing cluster can be used to run envtest, by loading up CRDs and client config.

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Debugging Kubernetes Flow Chart

Not sure of the source of this

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• https://dave.cheney.net/practical-go/presentations/qcon-china.html

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How to calculate probability

Counting Distinct Objects

Combinations and Permutations

Combinations: Order Doesn't Matter

$$ C = \frac{n!}{(n-r)!r!}$$

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Python Handbook

Intended audience: relatively experienced software engineers who don't know Python (yet).

Python lambdas

Python isn't a "functional" language, but it has adopted some FP methods around 1994.

A function in Python:

def identity(x):

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core.autocrlf (man git-config)

core.autocrlf
   Setting this variable to "true" is the same as setting the text attribute to "auto" on all files and core.eol to "crlf".
   Set to true if you want to have CRLF line endings in your working directory and the repository has LF line endings.            This variable can be set to input, in which case no output conversion is performed.

e.g., CRLF false for EOL in Github POSIX/Windows cross-platform development.