raynix 筆記

raynix 筆記

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  • Home Battery, Worth Buying?

    During the lockdown days in 2020, I got A Tesla Powerwall 2 + Backup Gateway 2 combo installed by Natural Solar. The total cost was A$14,000. “Is it worth buying?” or “Would it pay for itself?” those were the question I got asked a lot. With a full year’s data from 2021, I think I…

    May 11, 2022
    Energy Efficiency
    Clean Energy, PowerWall, Tesla
  • Blog Deployed With Jsonnet, Grafana Tanka and ArgoCD

    It’s been a year since I did the ‘Hello World’ with Jsonnet and Tanka, then I made a simple side-loader container to install Tanka as a plugin to ArgoCD and finally deployed an httpbin container with ArgoCD + Tanka + Jsonnet. However since Jsonnet wasn’t used in my work, those things were shelved afterwards. Recently…

    May 2, 2022
    Opensource, Systems Admin
    jsonnet, kubernetes, tanka
  • Easy Kubernetes Secret Integration with ExternalSecrets

    Easy Kubernetes Secret Integration with ExternalSecrets

    In a Kubernetes cluster, A Kubernetes Secret is a resource type to hold sensitive data for the apps to use, such as an API key or database password. Secrets are namespaced so if I have RBAC access to a namespace, I can pretty much see all the secrets there, as the secrets are only base64…

    April 29, 2022
    Opensource, Systems Admin
    ExternalSecret, kubernetes
  • Installation of Fedora 36 on Dell XPS 13 9380

    Installation of Fedora 36 on Dell XPS 13 9380

    I happened to have acquired a used Dell XPS 13 9380, which is a nice little ultrabook with Intel 8th gen i7 CPU, 16GB memory(not upgrade-able), 512GB nvme SSD and a beautiful 13″ 4k screen. It has Windows 10 installed. Of course I have no intention to continue to use the stock Windows 10. At…

    April 16, 2022
    Hardwares, Opensource
    Dell, Fedora, linux
  • Better Resilience for Kubernetes Pods

    I happened to notice that all 3 pods serving this blog in my Kubernetes cluster were allocated to a same node. I thought Kubernetes will try its best to shuffle pods of a deployment into different nodes by default but guess I expected too much. Note the knode3 below Have you spotted the problem? In…

    April 11, 2022
    Opensource, Systems Admin
    kubernetes
  • 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
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