Fabian Lee : Software Engineer

Ubuntu: fixing apt NO_PUBKEY errors by converting deprecated keyring to signed-by attribute

January 15, 2023
Categories: Linux

If apt update throws warnings about invalid signature verification and NO_PUBKEY, you may need to migrate from using the deprecated system keyring to using a ‘signed-by’ attribute in your apt repo definition file. Here are examples of errors you might see when doing an ‘apt update’. W: An error occurred during the signature verification. The … Ubuntu: fixing apt NO_PUBKEY errors by converting deprecated keyring to signed-by attribute

Jekyll: exporting a WordPress blog to a static Jekyll site on Ubuntu

January 5, 2023
Categories: Linux

If you have ever considered moving from WordPress to the Jekyll static site generator, you can preview this migration by running jekyll on your local Ubuntu host. This will allow you to assess whether you can find suitable replacements for the WordPress plugins you have come to rely upon, validate your content syntax, and tweak … Jekyll: exporting a WordPress blog to a static Jekyll site on Ubuntu

Kubernetes: export a clean yaml manifest that can be re-imported

June 6, 2022
Categories: Kubernetes

It is easy to export the full manifest of an object from a Kubernetes cluster, but it will have extraneous accounting fields that not only make it hard to visually assess and compare to its original form, but can also cause a re-apply to fail. Using a combination of the jq and yq utilities, we … Kubernetes: export a clean yaml manifest that can be re-imported

Kubernetes: alternative to export for removing internal fields from yaml

January 26, 2022
Categories: Linux

The ‘export’ flag in kubectl was deprecated in 1.18, but you still need a way to dump the yaml of Kubernetes objects, often for the purpose of reapplying changes. The problem with doing a simple ‘get’ using a yaml output like below is that additional internal accounting attributes like ‘selfLink’, ‘creationTimestamp’, ‘uid’, will be present … Kubernetes: alternative to export for removing internal fields from yaml

Kubernetes: ReadWriteMany (RWX) NFS mount using static volume

January 11, 2022
Categories: Containers

If you have an external NFS server and want to share that volume in RWX mode (ReadWriteMany), the most basic way is to manually create the persistent volume and persistent volume claim. In this article, I will show you how to manually create a pv (persistent volume) representing an external NFS, and persistent volume claim … Kubernetes: ReadWriteMany (RWX) NFS mount using static volume

Git: cloning a git repository from one location to another

June 18, 2021
Categories: Development

Most Git providers-as-a-service have administrative functions for renaming, moving, and even importing repositories from other provider URLs. However, it is also valid to perform these operations manually by repointing the origin and then pushing all commits and tags to a new repository URL. # make sure all changes are pushed first git push # check … Git: cloning a git repository from one location to another

Kubernetes: copying a secret from one namespace to another

April 9, 2021
Categories: Containers

If you need to copy a secret from one namespace to another, you will get an error because the ‘namespace’ is still embedded in the yaml and cannot be overridden with the final apply. By using a sed replacement as a filter, you can do a quick transformation and get your desired result. Below is … Kubernetes: copying a secret from one namespace to another

Ruby: Copying gems to hosts with limited internet access

October 14, 2018
Categories: Linux

In a production environment, it is common to have restricted internet access on production hosts. This means that using the standard ‘gem install’ and pulling gems from the rubygems.org repository directly on that host is not an option. What is needed is a way to use an internet-connected development host that matches the target production … Ruby: Copying gems to hosts with limited internet access

VMware: Exporting from Oracle VirtualBox/Vagrant to vCloud Director

November 30, 2016
Categories: DevOps

Oracle VirtualBox as a virtualization engine paired with Vagrant provides a cross-platform virtualization-agnostic workflow for Linux, Windows, and MacOS. It is light enough to allow a developer to setup, test, and tear down virtual infrastructure as part of a unit test. You may find yourself in a position where you have built a VM in … VMware: Exporting from Oracle VirtualBox/Vagrant to vCloud Director

Ubuntu: Using Fiddler to analyze Chrome/Firefox network capture

October 3, 2016
Categories: Linux

The prevalence of the long chains of firewall and reverse proxy solutions present in production infrastructure (and made even more popular with the dynamic routing introduced with containers) has made analysis of the end-user side of the network exchange a critical tool in troubleshooting. Fiddler has long been a solid tool for both proxy capture … Ubuntu: Using Fiddler to analyze Chrome/Firefox network capture