raynix 筆記

raynix 筆記

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  • How to Regulate Egress Access in Kubernetes with Istio

    Usually I don’t mind to give pods unlimited egress access, ie. the pods I deployed can access the whole internet if it needs to. However when the pods take input from users it’s a whole different story. For example, running some sandbox applications such as an online Python learning environment, the workload can be abused […]

    March 30, 2022
    Opensource, Systems Admin
    egress, istio, kubernetes
  • Flyway Container, MySQL and SSL/mTLS

    Flyway is a handy utility to manage database schema migrations. Very similar to the schema migration mechanism in Ruby on Rails or Django, but Flyway is a standalone tool. So it’s best suited for some project which doesn’t have database schema management yet. I needed to use Flyway for a project I worked with, the […]

    March 4, 2022
    Opensource, Systems Admin
    Flyway, mysql, SSL
  • Bill Shock: The Real Cost of Tesla Model 3 After 1 Year

    Bill Shock: The Real Cost of Tesla Model 3 After 1 Year

    VicRoads timely reminded me that it’s time to renew my Tesla Model 3’s registration(rego), so it’s been a year already. I think it might be interesting to calculate the real cost of owning a (Tesla) EV. I also put imaginary figures of my previous diesel BMW there for an unfair comparison. Tesla Model 3 Previous […]

    February 26, 2022
    Emerald Dreams, Energy Efficiency
    Tesla
  • Some Field Test with Google Cloud Run

    Recently I got a chance to migrate on-premise applications to GCP(Google Cloud Platform), and ran the apps in containers via Cloud Run. Here are some pros and cons that I think about the fully managed Cloud Run. Pros: Very easy to get started. As long as the app can run in a container, it can […]

    February 15, 2022
    Systems Admin
    Cloud Run, Google Cloud
  • Some Tips for CKA Exams

    I’ve passed my CKA exam on my first attempt, it’s not hard because it’s the entry level certificate for Kubernetes but still a good preparation is necessary even for someone already experienced in Kubernetes. First of all, the exam is fully hands-on: every question requires a set of commands done in a terminal provided in […]

    January 18, 2022
    Emerald Dreams
    kubernetes
  • Passing Environment Variables to Terraform with RegExp

    In a Terraform template, an input variable can be used to set some configuration point for a resource, such as In some scenario the input variable can get its value from an environment variable in the shell where terraform runs. It looks like This is handy where there is just a few variables. If there […]

    December 17, 2021
    Opensource, Systems Admin
    regex, Terraform
  • Share Environment Variables in GNU Make

    I think writing up a cheat sheet for GNU Make and environment variables before Christmas is a good idea, right? In GNU Make, by default a single line runs in its own shell. ie. We can use backslash to fake multi-line like this: With .ONESHELL directive multiple lines in one target run in a same […]

    December 14, 2021
    Opensource
    bash, GNU, linux, Make
  • My Last Dota 2 Game

    I started playing Dota 2 in 2014 because: It was a fun game Can run natively on Linux I picked it up again when the lock down started in 2020, and played quite a lot in the following months. Until I thought I have had enough Dota, because: The game was getting more complicated and […]

    November 17, 2021
    Games!
    dota
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