• Simplifying Input Parameters in Pulumi and AWS CDK Libraries

    2 min read

    Pulumi AWS CDK input parameters string pointers

    Some libraries require you to use string pointers or custom objects for some input parameters, notable examples are Pulumi and AWS CDK. If we only need to provide some static value for it can be annoying to use.

    16/05/2023

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  • Operator-SDK: Set custom fields for kubectl get

    2 min read

    Kubernetes Operator-SDK CustomResourceDefinition additionalPrinterColumns get fields

    When writing a custom Kubernetes operator using operator-sdk we might want to change the fields are show when running kubectl get:

    $ kubectl get example
NAME   AGE
demo   4h20m

    To do so, we'll need to add the additionalPrinterColumns field the the CustomResourceDefinition, but since we are using operator-sdk to take care of this, we'll need to use some annotations in the resource definition file.

    15/05/2023

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  • Deploying Cloud Resources with Pulumi and LocalStack

    2 min read

    Pulumi AWS LocalStack golang

    Pulumi is a powerful infrastructure as code tool that allows developers to deploy and manage cloud resources using familiar programming languages. However, when it comes to using Pulumi with LocalStack, there are some changes that need to be made to make Pulumi be able to reach LocalStack.

    25/04/2023

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  • How to Change the Scope of a Kubernetes API Resource with Operator-SDK

    2 min read

    Kubernetes API Resource Operator-SDK CustomResourceDefinition Namespaced Cluster Scope

    When creating a new API resource using the operator-sdk we can use the namespaced flag to make it Namespaced:

    $ operator-sdk create api --group group \
                          --version v1 \
                          --kind Example \
                          --resource \
                          --controller

    Or in the cluster scope:

    $ operator-sdk create api --group group \
                          --version v1 \
                          --kind Example \
                          --resource \
                          --controller \
                          --namespaced=false

    Maybe because we forgot to add the flag or because we have changed our mind, we don't need delete the object to change the scope of it, let's see how.

    05/04/2023

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  • go get: Add a module from a private GitHub repository

    2 min read

    GitHub private repository go get

    If you try to add a golang module that is on a private repository you'll get an error similar to this:

    $ go get github.com/pet2cattle/golang-demo
go: downloading github.com/pet2cattle/golang-demo v0.0.0-20220925191817-0b4b7026fa7f
go: github.com/pet2cattle/golang-demo@v0.0.0-20220925191817-0b4b7026fa7f: verifying module: github.com/pet2cattle/golang-demo@v0.0.0-20220925191817-0b4b7026fa7f: reading https://sum.golang.org/lookup/github.com/pet2cattle/golang-demo@v0.0.0-20220925191817-0b4b7026fa7f: 404 Not Found
        server response:
        not found: github.com/pet2cattle/golang-demo@v0.0.0-20220925191817-0b4b7026fa7f: invalid version: git ls-remote -q origin in /tmp/gopath/pkg/mod/cache/vcs/75d68059a7355b978972dea177e930262ce90abe410680b8db8a45a587e02c26: exit status 128:
                fatal: could not read Username for 'https://github.com': terminal prompts disabled
        Confirm the import path was entered correctly.
        If this is a private repository, see https://golang.org/doc/faq#git_https for additional information.

    26/09/2022

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From pet to cattle
Treat your kubernetes clusters like cattle, not pets