reference – Jessitron

Testing an OpenTelemetry Collector deployed as a Daemonset in Kubernetes

September 9, 2023September 8, 2023

TL;DR: skip to this readme for the easiest path When you’re running applications in Kubernetes, and you’re using OpenTelemetry for observability, then one recommended practice is to run the OpenTelemetry Collector on each node in your cluster. Then each of your applications can send telemetry data (traces, metrics, logs) to that local collector. To run …

Setting up ALB Access Logs in EKS using Terraform

April 27, 2023April 21, 2023

My objective is to troubleshoot 502 errors in my load balancer. The first step is to set up access logs. That says to create an S3 bucket, create a policy for it, and then configure the load balancer. I refuse to do this in the console; I’m using terraform to create resources and kubernetes to …

How to search for requests (vs all events) in Honeycomb

February 25, 2023February 25, 2023

Have you ever looked at someone else’s Honeycomb query and thought “what’s up with ‘trace.parent_id does not exist’? Or wondered how Honeycomb’s home screen counts Total Requests? This is totally confusing. Here, I made a video about how to do it and why it works like that.

bash: get the directory this script is in

February 21, 2023February 21, 2023

${BASH_SOURCE%/*} This is useful when you want to read a file that’s in the same directory as the current script, for instance. $BASH_SOURCE holds the current script, including a path. That could be a relative path or a full path. % says “strip off a glob from the end of the value, the smallest glob …

Book Review: Software Design By Example

February 21, 2023February 20, 2023

People can “learn to code” on so many websites, in little in-browser environments. Sites instruct on the basics of ‘for’ loops and ‘if’ statements. In advanced courses, learn algorithms and data structures. Writing toy programs is eminently teachable. Writing useful programs is something else. And writing them well is a mysterious art. Greg Wilson‘s new …

Make https work on gRPC in Rust: load a root certificate into the TLS config

November 2, 2022November 2, 2022

Why is this so hard? To send gRPC messages in Rust, one uses the tonic library. If you’re sending to an https endpoint, you’ll need to provide a ClientTlsConfig. By default, you’ll get a very distrustful one. Here’s the error message: the grpc server returns error (The service is currently unavailable): , detailed error message: …

Run the OpenTelemetry Collector in Kubernetes for Front-End Tracing

September 9, 2023August 22, 2022

TL;DR: Run the OpenTelemetry Collector helm chart with –values=values.yaml pointing to the values.yaml in this gist. Use kubectl get services to find the collector’s URL. The rest of this blog post walks through the whole process of setting this up. This will teach you the why and how of each step, so that you can adjust it to your needs. There’s also …

Jessitron’s favorite git aliases

February 3, 2021June 2, 2020

so I can find them here later: Fast-forward merge Some people like to git pull, but I never do. That brings new stuff from origin and then merges. I always do these do steps separately: git fetch and then either merge or rebase. The easy case, when I don’t have any local-only commits, is to …

PowerShell equivalent of find

March 1, 2021April 23, 2020

TL;DR: gci -r -fi <filename-pattern> My favorite use of find in bash is to find files whose name matches a pattern. For instance, find all the jar files under this directory: bash# find . -name ‘*.jar’ In PowerShell, there’s a program called “find” but it ain’t the same program. Short Answer Instead, use Get-ChildItem. The …

PowerShell for `rm -rf`

March 12, 2020March 12, 2020

TL;DR – Remove-Item -Recurse -Force <path> On linuxy systems, rm -rf <path> means “remove this path and everything under it, dammit.” If the files aren’t writeable, but you own the files, it deletes them anyway. In PowerShell, rm is aliased to Remove-Item, but it doesn’t accept -rf. Windows Terminal> rm -rf fooRemove-Item : A parameter …