• helm: Set a value using the CLI options

  1 min read

  
  

  Sometimes it comes handy to be able to set values using options instead of having to create a values files. Setting a value is quite trivial:

  helm install argocd argo/argo-cd -n argocd --set 'server.ingress.enabled=true'
  

  But how do we setup an array variable?

  02/01/2023

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• Synthetic ClusterRole or Role using an aggregationRule

  2 min read

  
  

  Having a Role or ClusterRole giving permissions to different apiGroups for different reasons makes it difficult to track and, later on, to maintain. By splitting the permissions on logical groups allows us to give predefined groups of permissions to the actual Role.

  13/12/2022

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• Adding a comment on a Pull Request using Github Actions

  2 min read

  
  

  As part of a CI/CD pipeline involving GitHub Actions we might want to be able to add a comment to the PR to notify the user about something:

  name: demo_add_comment_pr
  on:
    pull_request:
      types: [opened, ready_for_review]
    push:
      branches:
        - '**'
        - '!main'
      paths:    
        - cluster-resources/**
        - tests/**
    workflow_dispatch:
  
  (...)
  

  12/12/2022

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• Create a JSON object using a cli tool: jq

  1 min read

  
  

  We can define jq tool as what's sed but for JSON data: We can use it for multiple purposes, for example to create a valid JSON object.

  Let's assume we want to create a JSON containing a multi-line string, we can simulate it like follows or just use some file with cat:

  $ echo -e "multi\nline"
  multi
  line
  

  07/12/2022

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• nmap: List only open ports while scanning

  2 min read

  
  

  While scanning using nmap a network for a specific port (using the -p option), it can be confusing toe get a list of hosts that are alive with either closed or filtered ports while we only care for open ports:

  $ sudo nmap -sS 10.12.16.0/24 -p 8123
  Starting Nmap 7.80 ( https://nmap.org ) at 2022-12-04 18:18 CET
  Nmap scan report for _gateway (10.12.16.1)
  Host is up (0.0010s latency).
  
  PORT     STATE  SERVICE
  8123/tcp filtered polipo
  MAC Address: CD:44:F0:F4:22:44 (Unknown)
  
  Nmap scan report for 10.12.16.10
  Host is up (0.00020s latency).
  
  PORT     STATE SERVICE
  8123/tcp open  polipo
  MAC Address: DC:A6:33:77:AA:BB (Raspberry Pi Trading)
  
  Nmap scan report for 10.12.16.33
  Host is up (0.00046s latency).
  
  PORT     STATE  SERVICE
  8123/tcp closed polipo
  MAC Address: B8:27:EB:8D:99:11 (Raspberry Pi Foundation)
  
  (...)
  
  Nmap done: 256 IP addresses (15 hosts up) scanned in 1.78 seconds
  

  05/12/2022

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