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Listing all container images being used in kubernetes cluster

Getting all images referenced in pod specs:

kubectl get pods -A -o json  |
  jq -r '[.items[].spec | (.initContainers // empty | .[].image), .containers[].image] | unique | sort | .[]'

Getting all images cached on nodes:

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Vim web search using movements to select the search text

With the vim code below, you can perform a web search (Google in the example).

Typing v2wss will visually select 2 words and then open a google search with those 2 words. Typing ss2w will perform the same as above, but in normal mode.

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Opening JIRA issues from vim

Did you ever want to open a JIRA issue from vim, so you copied the jira issue name, opened the browser, opened JIRA then pasted the issue id into the search, then clicked on the search result?

That sequence above is terribly tedious!

With the vim script below, you just position your cursor on top of the ticket id, then hit gj and boom! Issue is opened in your browser!

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Inspecting Kubernetes JWT tokens

Start a cluster with a dummy workload

kind create cluster
kubectl apply -f cli.yaml
kubectl apply -f discovery.yaml

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mitmproxy on MacOS with Keychain integration

Root certificate generation

You need to get a root certificate in place for mitmproxy. The easy way to do that is to just run mitmproxy and exit. The certificate can then be found at ~/.mitmproxy/mitmproxy-ca.pem.

Putting the root certificate into the MacOS Keychain

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The simplest terraform version manager script you've ever seen

These two scripts provide the bare-minimum version-manager capability for terraform.

Installation:

1. Put both files somewhere on your PATH
2. chmod +x on both files to make them executable

Usage:

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provider "github" {
  # using environment variables:
  # GITHUB_ORGANIZATION
  # GITHUB_BASE_URL
  # GITHUB_TOKEN
}

data "github_team" "team" {
  slug = "test-team"
}

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provider "github" {
  # using environment variables:
  # GITHUB_ORGANIZATION
  # GITHUB_BASE_URL
  # GITHUB_TOKEN
}

resource "github_team" "team" {
  name = "test-team"
}

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The Terraform group_by you've been missing

I'm playing around a lot nowadays with Terraform 0.13 and I found a really interesting feature and that's the ... symbol (also called an ellipsis) to be used with for expressions.

The operator can be used for group_by operations.

Example

We have a list of entries. The list contains employee/manager/project triplets.

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CamelCase <--> snake_case conversion with jq

tl;dr

I provide you with 3 jq lib functions that will help you in converting between snake_case and CamelCase.

The interface

I want to change keys in my json from camelcase to snake_case.