Justyn - I Am Justyn

Renumber all windows in tmux

If you have a large number of windows open in tmux, it can be a pain when deleting some of them as the numbers are no longer consxistent. You could have 20 windows open, but the next window you create will be #2 because

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Install ZSH 5.8 on CentOS 7

Quick instructions for compling ZSH from source. Note that this is essentially just download/configure/make/make install. Look in https://www.zsh.org/pub/ for the most recent version if 5.8 is not the version you're looking for. cd /usr/src wget

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Sort ZFS filesystems by snapshot size

Quick one-liner to sort ZFS filesystems by the amount of space used by their snapshots.

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Install Emacs 28 (with Native Compilation) on CentOS 7

Instructions for installing Emacs 28 on CentOS 7, and also enabling the new Native Comp feature recently merged in. Note that this is similar to compiling Emacs 27, but requires extra dependencies to enable native compilation. At the time of this writing, there is

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Compile Emacs 27 on CentOS 7

Quick instructions for installing Emacs 27 on CentOS 7 since it doesn't seem to be available in any popular yum repositories. Install dependencies: # Note: This installs dependencies for X11 as well. Change this and the ./configure below if you don't want any X11 deps

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Migrate Kubernetes PVC to another PVC

Recently I have been testing different storage backends (like Rancher Longhorn, Rook, NFS, etc.) for Kubernetes. Since I'm switching pretty frequently, I needed a simple way to migrate or copy data from one pvc to another. Make sure both PVCs are created and have

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Completely reset local git repo

Note: These commands can easily cause data loss. Please do not run them if you do not understand what they do. Even if you do understand, make a backup just in case. If you need to wipe out all of your local changes: Use

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Delete a kubernetes pod stuck in 'Terminating' state

Occasionally you may run into a pod that is hung in Terminating state. Sometimes this pod may be on an unresponsive node or just doesn't exist anymore, but the kube api server doesn't know yet. To forcefully terminate the pod, I run through these

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Delete all pods in a Kubernetes Namespace

Quickly delete all pods (or other resources) in a Kubernetes namespace.

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Copy a Kubernetes secret to a different namespace

Kubernetes secrets are only accessible in the namespace they're created in. A quick one-liner to copy a secret from namespaceA to namespaceB is: kubectl get secrets <secret_name> --export --namespace=<namespaceA> -o yaml | kubectl apply --namespace=<namespaceB> -f

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Copy files/directories from one Kubernetes pod to another Kubernetes pod

Recently I have been experimenting with different ways to handle storage in Kubernetes; this usually requires me to rsync data from one storage backend to another. My goto solution was to mount both storage backend PVs in the same pod and use rsync, but

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Quickly check for broken links using wget

As part of migrating this website from Hugo to Ghost, I wanted to quickly check what links are broken so that I can fix them. wget isn't the best tool for the job, but it does offer a pretty quick sanity check. Using the

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Upload files to Nextcloud using curl (and webdav)

I recently had the need to upload a bunch of PDF files from a linux server to my Nextcloud instance. Nextcloud doesn't currently have a headless linux client, but WebDAV is available by default. Uploading a single file is as simple as: curl -T

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Deploy Varnish as a cache server in Kubernetes

kustomization.yaml file: --- apiVersion: kustomize.config.k8s.io/v1beta1 kind: Kustomization resources: - deployment.yaml - service.yaml configMapGenerator: - name: varnish-config files: - default.vcl Varnish deployment.yaml: --- apiVersion: apps/v1 kind: Deployment metadata: name: dev-justynio-ghost-varnish-deployment labels: app: ghost-varnish domain: dev.

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Enable caching using nginx-ingress

proxy_cache_path needs to be configured globally for the nginx-ingress-controller, which means creating or updating the nginx-configuration config map: --- apiVersion: v1 kind: ConfigMap metadata: labels: app: ingress-nginx name: nginx-configuration namespace: ingress-nginx data: http-snippet: "proxy_cache_path /tmp/nginx_cache levels=1:

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Enable (force) Dark Mode in Ghost's default Casper theme

I did not realize that Ghost's default theme, Casper, has a Dark mode for the longest time. By default, it is only enabled if the local OS has dark mode enabled and the browser exposes that information. Note: If you're using Capser 4.x,

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Increasing the max post/upload/body size in nginx-ingress

There's a proxy-body-size option that can be configured via an annotation on ingress objects. This option maps to client_max_body_size in the nginx configuration. edit: There is now an actual client-max-body-size annotation. --- apiVersion: extensions/v1beta1 kind: Ingress metadata: name: some-ingress annotations:

windows

Using a Yubikey for GPG in WSL (Windows Subsystem for Linux) on Windows 10

Previously, I wrote about using bash (WSL) on Windows 10. I've changed some of my setup since then, but still use something similar for when I'm developing on a Windows machine. Until recently, I have been disappointed with the lack of gpg support in

finances

Automatically Sort and Align Ledger Transactions in VIM

One of my goals for 2018 is to track all of my finances using plaintextaccounting. For now, I am using ledger-cli and vim. I won't go into detail on how to use ledger or plaintextaccount in this post, but wanted to share a quick

home automation

How to restart Home Assistant docker container automatically on failure

Intro Quoting from the website: "Home Assistant is an open-source home automation platform running on Python 3. Track and control all devices at home and automate control." I've been using Home Assistant for a while now, and it quickly grew on me

windows

Using Bash (Windows Subsystem for Linux) on Windows 10

I recently reinstalled my main desktop computer, and decided to finally give "Bash on Windows 10", or the "Windows Subsystem for Linux", a real try. I'm hoping it will get rid of my need for Putty/WinSCP as well as

scripts

Monitoring PiHole with Telegraf and Influxdb

I recently installed Pi-hole on a spare Raspberry Pi 3. Pi-hole essentially blocks most advertisements from devices on a network, by running dnsmasq with a custom set of hosts to block. Before Pi-hole, I was using dnsmasq with a hosts list generated by a

projects

Random MAC Address Generator

You can view the original tool here. This script will generate a random MAC address for your use. If you select a Vendor, it will generate a random MAC within the address range owned by that vendor. The Random option will only generate random

projects

RemoteBashRC.sh

What is it? edit: I've experimented with different ways to do this, and will likely make an update post describing a new method. I used to work for a dedicated server hosting company. So naturally, we dealt with lots of servers every day, and

plesk

Rebuild missing SSL certificates from Plesk database

I’ve had to deal with errors similar to this occasionally on Plesk servers: root@cent:# apachectl -t Syntax error on line 55 of /var/www/vhosts/domain.com/conf/13449678050.31729500_httpd_ip_default.include: SSLCertificateFile: file '/usr/local/psa/var/certificates/