raynix 筆記

raynix 筆記

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  • Ansible, Packer and Configurations

    I use Ansible as provisioner for Packer, to build AMIs to be used as a base image of our development environment. When Ansible is used by Packer, it’s not quite intuitive whether it’s using the same ansible.cfg when I run ansible-playbook command in a terminal. Here’s how to make sure Ansible in Packer session will…

    November 17, 2018
    Systems Admin
    ansible, packer
  • Don’t Panic When Kubernetes Master Failed

    It was business as usual when I was upgrading our Kubernetes cluster from 1.9.8 to 1.9.10, until it isn’t. From AWS console I can see the new instance for the master is running and the old one has been terminated. There’s 1 catch though, the IP yy.yy.yy.yy is not the IP of the new master…

    October 24, 2018
    Opensource, Systems Admin
    AWS, kops, kubernetes
  • Run Google Lighthouse in Docker Container

    Thanks to my Colleague Simon’s suggestion, I was introduced to Google Lighthouse, an opensource nodejs framework to use Google Chrome to audit a website’s performance. I like Lighthouse because: opensource good portability can run as CLI command or as a nodejs module Here’s a sample Dockerfile to have a container ready to run Lighthouse with…

    October 13, 2018
    Opensource, Web Design
    docker, google lighthouse, web performance
  • Use Python to Check Difference between Directories Recursively

    I needed to track differences between software release packages, so that if anything changed dramatically, eg. some file missing or much smaller than expected, I can then get a notification to review the new potentially flawed package. I found that filecmp.dircmp class in Python is spot on for this job. Here’s my snippet to compare…

    September 15, 2018
    Systems Admin
    diff, Python
  • Upload Limit in Kubernetes Nginx Ingress Controller

    According to https://github.com/nginxinc/kubernetes-ingress/issues/21#issuecomment-408618569, this is how to lift the upload limit in Nginx Ingress Controller for Kubernetes after recent update to the project: apiVersion: extensions/v1beta1 kind: Ingress metadata: name: test-project-ingress namespace: test-project-dev annotations: kubernetes.io/ingress.class: dev nginx.ingress.kubernetes.io/proxy-body-size: 200m spec: rules: – host: test-project.dev.com http: paths: – path: / backend: serviceName: test-project servicePort: 80 And for now…

    September 15, 2018
    Systems Admin
    ingress, kubernetes
  • Auto Scaling in Kubernetes 1.9

    I updated my Kubernetes cluster from 1.8 to 1.9 recently, the upgrade process is very smooth, however the auto-scaling part seemed to be failing. Below are some notes on how I troubleshoot this issue. First to ensure I have both kops and kubectl upgraded to 1.9 on my laptop: Install kubectl 1.9: curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.9.10/bin/linux/amd64/kubect…

    August 29, 2018
    Systems Admin
    kubernetes
  • Command Line Recording Goes SVG

    Term To SVG is lovely little utility to record a terminal session into a .svg animation. And below is a recording of how I installed termtosvg myself on Arch Linux.

    August 27, 2018
    Free software, Opensource
    CLI
  • Manage AWS EBS Snapshot Life Cycle with Lambda

    The timing is not so great. The AWS Data Lifecycle Manager has been announced but I can’t wait for its release. So I decided to use AWS Lambda to do some snapshot lifecycle management. First a role for Lambda having full access to snapshots can be created via the console. To create snapshot with Python…

    August 10, 2018
    Systems Admin
    AWS, Lambda, Python
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