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Technotes for future me
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Last updated on 2 May 2025
Published on 31 Mar 2025
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Proxmox
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Proxmox after install
Containers
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Containerd
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How to run and manage containers using ctr
How to use nerdctl if you are familiar with Docker CLI
How to work with container images using ctr
Portworx
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Portworx cheatsheet
Harbor
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Harbor
Helm
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Helm
Kubernetes
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Kubernetes cronjob
How to trigger a Kubernetes cronjob manually
ConfigMap
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Mounting a ConfigMap to an Existing Volume in Kubernetes
Updating a ConfigMap
Scheduling
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nodeSelector and nodeAffinity
PodAffinity
Taint and Tolerations
Kubernetes: Evenly Distribution of Pods Across Cluster Nodes
Canary testing
Life Cycle Management
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Kubent
Kubernetes rollout history and rollback
Network Policies
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Kubernetes Network Policy Recipes
Kubernetes Network Policies
Role Based Access Control RBAC
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Creating A Kubernetes Service Account To Run Pods
Kubernetes Role Based Access Control RBAC
Authorization
Kubernetes namespace deleting stuck in Terminating state
kubectl error: You must be logged in to the server (Unauthorized) – how to fix
Backup and Restore Kubernetes ETCD database
Clean up old containers and images in your kubernetes cluster
Kubernetes CheatSheet
Kubernetes Pod Security Policies explained
Kubernetes copy data between pvc
Kubernetes pvc deleting stuck in Terminating state
Easy way to change namespace in Kubernetes
Pull an Image from a Private Registry
Check PVC usage
Kubernetes NodePort vs LoadBalancer vs Ingress
externalTrafficPolicy
Quota's, Limits and Resources
Upgrade Kubernetes
Volumes
Generate TLS Secret for kubernetes
Update cluster DRAFT - NOT TESTED
Kubernetes
Docker
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GoLang: Using multi-stage builds to create clean Docker images
Docker
Docker CMD vs ENTRYPOINT
Docker Swarm
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Docker: determining container responsible for largest overlay directories
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Nexus database restore
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Python 3.11, pip and (breaking) system packages
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Using VSCode over SSH
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Demo
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WSL
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Running Docker on WSL2 without Docker Desktop
Go
Testing
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Siege
Curl
Bash
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Source
Level up your shell history with Loki and fzf
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Snippets
Redis
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Redis
Network
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dnsdiag
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AppArnor
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Apache
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Splunk
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Splunk
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Terraform
Virtualization
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Quemu
KVM
LXC
Vagrant
VirtualBox
Jenkins
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Jenkins dump credentials
Jenkins DSL seed job
Send messages via mail and Slack
Jenkins Environment variables
Jenkins
Jenkins docs
Jenkins pipeline DSL
JenkinsX
Jinja
Script to automaticaly install plugins in Jenkins.
Jenkins create git webhook
Jenkins use git submodule with declarative pipeline
Jenkins create git pipeline
Jenkins sources
Monitoring
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Alertmanager
Netdata
Node exporter
Prometheus
Test
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Chapter 1
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Chapter 1-1
Chapter 1-2
Chapter 1-3
Chapter 1-4
Chapter 2 (weighted)
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Chapter 2-3 (weight: 10)
Chapter 2-4 (weight: 20)
Chapter 2-2 (weight: 30)
Chapter 2-1 (weight: 40)
Chapter 3 (hierarchized)
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Chapter 3-1
Chapter 3-2
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Chapter 3-2-1
Chapter 3-2-2
Chapter 3-2-3
Chapter 3-2-4
Chapter 3-3
Chapter 3-4
Sample Document
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Build-in Shortcodes
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Table of Contents
Template
Performance Test
Blaataap
test
Ansible
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Running Ansible through SSH Jump / Bastion Host
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Ansible course notes
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Ansible remove line from file
Ansible roles
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Ansible set permissions of file
add iptable rule
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Ansible check if port is listening
Ansible execute a role with condition
Ansible fail if condition fails
Ansible force ansible version
Ansible idempotently change file attributes
Ansible patch single package
Ansible patching or using forked version ansible galaxy role
Ansible pipelining
Ansible register shell output
Ansible run playbook
Ansible with items key and value
Better CLI experience
Cheatsheet
Cloning private GitHub repositories with Ansible on a remote server through SSH
Certificates
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Certificates Kubernetes
SAN Certificates
Show Certificate info
Certificates
Git
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Quickly import your ssh public keys from Github with ssh-import-id
Unfork a repo on GitHub
Clean up old git branches
Compare encrypted git files
Git errors and how to solve them
How to compare two git branches
Show current git branch with colors in Bash prompt
Git tips
GitHub SSH auth
Linux
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Ubuntu
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How to Enable Minimize on Click on Ubuntu
Split a file in blocks and do something with each block
Hot add memory
How to convert JPG to PDF in Linux
Create Password Protected ZIP in Linux
awk
sed
Find
Memory
Base64 encode/decode
Network NMCLI
Cron
tping ping with a timestamp
Killall
SELinux
Systemctl
wget
Boot CentOS/RHEL in single user mode
Auditd
DBUS
Debian
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FFMPEG
Filesystem
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IPMI
JQ
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Screen vs TMUX
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Systemd
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vi
vi2
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Safer bash scripts
dd
Empty mailq
Empty mailq
Firewall
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Logging
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Mount
NTP
pgrep
Restart ELK stack
Sar issue
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Screen
Swap
Puppet
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Hiera
Mcollective
Puppet
Parameters
Puppet Duplicate Resources with PuppetDB
Ubuntu
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Always connect VPN Ubuntu 19.10
Pulse Audio Bluetooth codecs
Varnish
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Varnish Cheat sheet
Varnish Purge
varnishlog
Markdown
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