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https://github.com/harisekhon/harisekhon

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# Hari Sekhon's GitHub

[![GitHub Profile Views](https://komarev.com/ghpvc/?username=your-github-username&color=blue&label=GitHub+Profile+Views)](https://github.com/HariSekhon)
[![GitStar Rank](https://img.shields.io/badge/GitStar%20Rank%20by%20Repo%20Stars-Top_0.01%25-blue?logo=github)](https://gitstar-ranking.com/HariSekhon)
[![GitRoll Rank Globally](https://img.shields.io/badge/GitRoll%20Rank%20Globally-Top_2%25-blue?logo=github)](https://gitroll.io/profile/u5eNfjd3L4KXzBVekMrxkLvCEmYt2)
[![GitRoll Rank UK](https://img.shields.io/badge/GitRoll%20Rank%20UK-Top_5%25-blue?logo=github)](https://gitroll.io/profile/u5eNfjd3L4KXzBVekMrxkLvCEmYt2)
[![GitRoll Language Breakdown](https://img.shields.io/badge/GitRoll-Language%20Breakdown-blue?logo=github)](https://gitroll.io/profile/u5eNfjd3L4KXzBVekMrxkLvCEmYt2/languages)
[![GitRoll TechStacks Breakdown](https://img.shields.io/badge/GitRoll-Tech%20Stack%20Breakdown-blue?logo=github)](https://gitroll.io/profile/u5eNfjd3L4KXzBVekMrxkLvCEmYt2/stacks)
[![StarCharts](https://img.shields.io/badge/Star-Charts-blue?logo=github)](https://github.com/HariSekhon/DevOps-Bash-tools/blob/master/STARCHARTS.md)
[![My LinkedIn](https://img.shields.io/badge/LinkedIn%20Profile-HariSekhon-blue?logo=data:image/svg%2bxml;base64,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)](https://www.linkedin.com/in/HariSekhon/)

![Original Repos](https://img.shields.io/badge/Repos-37-blue?logo=github)
![Stars](https://img.shields.io/badge/Stars-12443-blue?logo=github)
![Forks](https://img.shields.io/badge/Forks-3340-blue?logo=github)
![Followers](https://img.shields.io/badge/Followers-1947-blue?logo=github)

![Total Lines](https://img.shields.io/badge/Total%20Lines-563772-blue)
![Total Man Years](https://img.shields.io/badge/Total%20Man%20Years-94%20years%209%20months-blue)
![Total COCOMO Cost Estimate](https://img.shields.io/badge/Total%20COCOMO%20Cost%20Estimate-$12,800,287-blue)

[![CI/CD Builds](https://img.shields.io/badge/CI%2FCD%20Builds-730-blue?logo=circleci)](https://harisekhon.github.io/CI-CD/)
[![CI/CD Systems](https://img.shields.io/badge/CI%2FCD%20Systems-23-blue?logo=circleci)](https://harisekhon.github.io/CI-CD/)

[![Codacy](https://app.codacy.com/project/badge/Grade/f86efb3e0a6a4f2886c7b28c4b0159ca)](https://www.codacy.com/gh/HariSekhon/HariSekhon/dashboard)
[![CodeFactor](https://www.codefactor.io/repository/github/HariSekhon/HariSekhon/badge)](https://www.codefactor.io/repository/github/HariSekhon/HariSekhon)
[![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=HariSekhon_HariSekhon&metric=alert_status)](https://sonarcloud.io/dashboard?id=HariSekhon_HariSekhon)
[![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=HariSekhon_HariSekhon&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=HariSekhon_HariSekhon)
[![Reliability Rating](https://sonarcloud.io/api/project_badges/measure?project=HariSekhon_HariSekhon&metric=reliability_rating)](https://sonarcloud.io/dashboard?id=HariSekhon_HariSekhon)
[![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=HariSekhon_HariSekhon&metric=security_rating)](https://sonarcloud.io/dashboard?id=HariSekhon_HariSekhon)
[![Vulnerabilities](https://sonarcloud.io/api/project_badges/measure?project=HariSekhon_HariSekhon&metric=vulnerabilities)](https://sonarcloud.io/summary/new_code?id=HariSekhon_HariSekhon)

[![GitHub Profile](https://img.shields.io/badge/GitHub-HariSekhon-2088FF?logo=github)](https://github.com/HariSekhon)
[![GitLab Profile](https://img.shields.io/badge/GitLab-HariSekhon-FCA121?logo=gitlab)](https://gitlab.com/HariSekhon)
[![Azure DevOps Profile](https://img.shields.io/badge/Azure%20DevOps-HariSekhon-0078D7?logo=azure%20devops)](https://dev.azure.com/harisekhon/GitHub)
[![BitBucket Profile](https://img.shields.io/badge/BitBucket-HariSekhon-0052CC?logo=bitbucket)](https://bitbucket.org/HariSekhon)

[![DockerHub](https://img.shields.io/badge/DockerHub-harisekhon-blue?logo=docker&logoColor=white)](https://hub.docker.com/u/harisekhon/)
[![GitHub Pages](https://img.shields.io/badge/GitHub-Pages-2088FF?logo=github)](https://harisekhon.github.io/CI-CD/)
[![Netlify](https://img.shields.io/badge/Netlify-site-00C7B7?logo=netlify)](https://harisekhon.netlify.app/)
[![Markdown](https://github.com/HariSekhon/HariSekhon/actions/workflows/markdown.yaml/badge.svg)](https://github.com/HariSekhon/HariSekhon/actions/workflows/markdown.yaml)

## About Me

20 Year IT veteran with many domain specialities. GitHub addict.

💬 Ask me about: DevOps, Cloud, Data, Coding, APIs...

✉️ Contact me on [LinkedIn](https://www.linkedin.com/in/HariSekhon/):

[![My LinkedIn](https://img.shields.io/badge/LinkedIn%20Profile-HariSekhon-blue?logo=data:image/svg%2bxml;base64,PHN2ZyByb2xlPSJpbWciIGZpbGw9IiNmZmZmZmYiIHZpZXdCb3g9IjAgMCAyNCAyNCIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48dGl0bGU+TGlua2VkSW48L3RpdGxlPjxwYXRoIGQ9Ik0yMC40NDcgMjAuNDUyaC0zLjU1NHYtNS41NjljMC0xLjMyOC0uMDI3LTMuMDM3LTEuODUyLTMuMDM3LTEuODUzIDAtMi4xMzYgMS40NDUtMi4xMzYgMi45Mzl2NS42NjdIOS4zNTFWOWgzLjQxNHYxLjU2MWguMDQ2Yy40NzctLjkgMS42MzctMS44NSAzLjM3LTEuODUgMy42MDEgMCA0LjI2NyAyLjM3IDQuMjY3IDUuNDU1djYuMjg2ek01LjMzNyA3LjQzM2MtMS4xNDQgMC0yLjA2My0uOTI2LTIuMDYzLTIuMDY1IDAtMS4xMzguOTItMi4wNjMgMi4wNjMtMi4wNjMgMS4xNCAwIDIuMDY0LjkyNSAyLjA2NCAyLjA2MyAwIDEuMTM5LS45MjUgMi4wNjUtMi4wNjQgMi4wNjV6bTEuNzgyIDEzLjAxOUgzLjU1NVY5aDMuNTY0djExLjQ1MnpNMjIuMjI1IDBIMS43NzFDLjc5MiAwIDAgLjc3NCAwIDEuNzI5djIwLjU0MkMwIDIzLjIyNy43OTIgMjQgMS43NzEgMjRoMjAuNDUxQzIzLjIgMjQgMjQgMjMuMjI3IDI0IDIyLjI3MVYxLjcyOUMyNCAuNzc0IDIzLjIgMCAyMi4yMjIgMGguMDAzeiIvPjwvc3ZnPgo=)](https://www.linkedin.com/in/HariSekhon/)

🔍 Secondary Expertise in:

- 🧑‍🤝‍🧑 Sociology
- 💰 Economics
- 📉 Demographics
- Private message me on [LinkedIn](https://www.linkedin.com/in/HariSekhon/)
for the answer to The Root Cause of Western Decline 📉
- as well as excellent resources on everything from jobs & money, to relationships & divorce, to emigration & taxes

## Public Open Source Stats

This does not include any private repos such as my corporate work eg. where most of my Pull Requests and many of my
commits went.

This only includes my public open source repos:

![GitHub Stats](https://github-readme-stats.vercel.app/api?username=HariSekhon&theme=ambient_gradient&show_icons=true&include_all_commits=true&hide=contribs,prs&custom_title=Hari+Sekhon%27s+Public+Open+Source+GitHub+Stats)

[Top Ranked by UK commits](https://github.com/gayanvoice/top-github-users/blob/main/markdown/public_contributions/united_kingdom.md)

## Core Public Repos

GitHub's limit of 6 pinned repos is far too low - these are what I consider my core open source public repos:

### Knowledge

[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Knowledge-Base&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Knowledge-Base)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Diagrams-as-Code&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Diagrams-as-Code)

### DevOps Code

[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=DevOps-Bash-tools&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/DevOps-Bash-tools)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=DevOps-Python-tools&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/DevOps-Python-tools)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=DevOps-Perl-tools&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/DevOps-Perl-tools)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=DevOps-Golang-tools&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/DevOps-Golang-tools)

### Containerization

[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Kubernetes-configs&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Kubernetes-configs)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Dockerfiles&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Dockerfiles)

### CI/CD

[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=GitHub-Actions&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/GitHub-Actions)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Jenkins&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Jenkins)

### Databases - DBA - SQL

[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=SQL-scripts&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/SQL-scripts)

### DevOps Reloaded

[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=HAProxy-configs&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/HAProxy-configs)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Terraform&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Terraform)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Packer&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Packer)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Ansible&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Ansible)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=TamperMonkey&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/TamperMonkey)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Environments&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Environments)

### Monitoring

[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Nagios-Plugins&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Nagios-Plugins)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Nagios-Plugin-Kafka&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Nagios-Plugin-Kafka)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Prometheus&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Prometheus)

### Templates

[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Templates&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Templates)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Template-repo&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Template-repo)

### Spotify

[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Spotify-tools&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Spotify-tools)
[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=Spotify-playlists&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/Spotify-playlists)

The rest of my original source repos are
[here](https://github.com/HariSekhon?tab=repositories&q=&type=source&language=&sort=stargazers).

Pre-built Docker images are available on my [DockerHub](https://hub.docker.com/u/harisekhon/).

## Tech

I've worked on far too many technologies to list, but
here is a shortlist of some of the more still popular ones you might recognize:






Linux




macOS




bash




Python




Git




Groovy




Go






Docker




Kubernetes




CI/CD




GitHub




Jenkins




MySQL




PostgreSQL






AWS




GCP




Microsoft Azure




Terraform




Ansible




redis




Cassandra






Prometheus




Grafana




Elasticsearch




Apache Spark




Apache Kafka





Neo4J




Vault




## Cocomo - Estimates of Man Years & Costs

### Repos




















































































































































































































































































































































































































































































































































































































































































































































































### Totals

![Total Lines](https://img.shields.io/badge/Total%20Lines-563772-blue)
![Total Man Years](https://img.shields.io/badge/Total%20Man%20Years-94%20years%209%20months-blue)
![Total COCOMO Cost Estimate](https://img.shields.io/badge/Total%20COCOMO%20Cost%20Estimate-$12,800,287-blue)

What have I done... I should have founded a company... 😂

## How the Hell, Bro

I get asked this a lot.

How the hell did this crazy guy write all these thousands of programs and scripts...




Well... honestly, unless I have something specific to do, this is me 👉

... often even at midnight.

I am simply not a man of moderation. The few things I care about in life I do a lot.

Even crazier,
the first decade of my career I released almost nothing because GitHub didn't exist when I started,
so I have even more code stuck in private repos that I maintained and migrated over years in Subversion,
then Mercurial, then Git, but have no time to go back to QA and release.





codecat

Writing the above I suddenly got curious enough to quickly rustle up a new
[Golang program](https://github.com/HariSekhon/GitHub-Graph-Commit-Times)
to generate this graph of my public repo commit times to see when I'm most active.

Generated by [HariSekhon/GitHub-Graph-Commit-Times](https://github.com/HariSekhon/GitHub-Graph-Commit-Times):

![GitHub Times Graph](https://raw.githubusercontent.com/HariSekhon/GitHub-Commit-Times-Graph/main/graph.svg)

The TL;DR takeaway from the above graph is don't bother me in the mornings, I take a while to warm up 😉.

I also dip a bit around midday and 9pm as I need to eat once in a while... and sleep a few hours in the very early AM.

![](https://hit.yhype.me/github/profile?user_id=2211051)


oreilly_book_choosing_by_github_stars

## Star History

![Star History - if this graph hasn't loaded please refresh the page](https://api.star-history.com/svg?repos=HariSekhon/DevOps-Bash-tools,HariSekhon/DevOps-Python-tools,HariSekhon/DevOps-Perl-tools,HariSekhon/DevOps-Golang-tools,HariSekhon/Nagios-Plugins,HariSekhon/Dockerfiles,HariSekhon/Kubernetes-configs,HariSekhon/HAProxy-configs,HariSekhon/SQL-scripts,HariSekhon/GitHub-Actions,HariSekhon/Jenkins,HariSekhon/Templates,HariSekhon/Knowledge-Base,HariSekhon/Diagrams-as-Code&type=Date)

I just found out why my
[DevOps-Bash-tools](https://github.com/HariSekhon/DevOps-Bash-tools)
repo stars went vertical in the graph above.
GitHub themselves showed it at the top of their Trending repos page:



GitHub Trending


baby yoda gasping over GitHub stars

## Gantt Chart of GitHub Repos Active Dates

Generated by:
[HariSekhon/GitHub-Repos-MermaidJS-Gantt-Chart](https://github.com/HariSekhon/GitHub-Repos-MermaidJS-Gantt-Chart)

```mermaid
%%{ init: {
"topAxis": true,
"logLevel": "debug",
'theme': 'dark',
'themeVariables': {
'activeTaskBkgColor': '#0000ff',
'activeTaskBorderColor': 'lightgrey',
'critBorderColor': 'lightgrey',
'doneTaskBkgColor': 'grey',
'doneTaskBorderColor': 'lightgrey',
'taskBkgColor': 'black',
'taskBorderColor': 'black',
'taskTextColor': 'white',
'taskTextDarkColor': 'white',
'taskTextLightColor': 'black',
'todayLineColor': 'red'
}
}
}%%
gantt
dateFormat YYYY-MM-DD
title Repositories Gantt Chart
Nagios-Plugins : active, 2012-12-30, 2020-12-31
lib : active, 2012-12-30, 2015-12-31
DevOps-Perl-tools : active, 2012-12-30, 2020-12-31
Spotify-tools : active, 2012-12-30, 2020-12-31
SQL-keywords : active, 2013-08-13, 2020-12-31
spark-apps : done, 2015-05-25, 2020-04-02
lib-java : active, 2015-05-31, 2016-12-31
DevOps-Python-tools : active, 2015-10-27, 2020-12-31
pylib : active, 2015-10-27, 2020-12-31
Dockerfiles : active, 2016-01-17, 2022-12-31
DevOps-Bash-tools : active, 2016-01-17, 2025-04-30
Nagios-Plugin-Kafka : active, 2016-06-07, 2017-12-31
HAProxy-configs : active, 2018-06-08, 2022-12-31
DevOps-Golang-tools : active, 2020-04-30, 2024-09-22
Spotify-Playlists : active, 2020-06-29, 2024-09-22
SQL-scripts : active, 2020-08-05, 2025-04-30
Kubernetes-configs : active, 2020-09-16, 2025-04-30
Templates : active, 2019-11-25, 2025-04-30
TeamCity-CI : active, 2020-12-03, 2022-12-31
Terraform : active, 2021-01-18, 2025-04-30
Jenkins : active, 2022-01-17, 2024-09-23
GitHub-Actions : active, 2022-01-17, 2025-04-30
CI-CD : active, 2022-03-25, 2023-12-31
GitHub-Actions-Contexts : active, 2022-08-17, 2022-12-31
Diagrams-as-Code : active, 2023-04-14, 2025-04-30
Template-Repo : active, 2023-04-15, 2025-04-30
Packer : active, 2023-06-02, 2024-09-21
Vagrant-templates : active, 2023-06-12, 2024-09-21
Knowledge-Base : active, 2023-11-22, 2025-04-30
HariSekhon : active, 2024-08-14, 2025-04-30
GitHub-Commit-Times-Graph : active, 2024-09-07, 2024-09-08
GitHub-Repos-MermaidJS-Gantt-Chart : active, 2024-10-02, 2024-10-03
Prometheus : active, 2024-10-08, 2025-04-30
Ansible : active, 2024-10-08, 2025-04-30
```

[![Readme Card](https://github-readme-stats.vercel.app/api/pin/?username=HariSekhon&repo=GitHub-Repos-MermaidJS-Gantt-Chart&theme=ambient_gradient&description_lines_count=3)](https://github.com/HariSekhon/GitHub-Repos-MermaidJS-Gantt-Chart)

## Gantt Chart of my Experience

This should give you some idea of my long evolution having reached the level of lead engineer and architect
by the mid-to-late 2000s.

```mermaid
%%{ init: {
"topAxis": true,
"logLevel": "debug",
'theme': 'dark',
'themeVariables': {
'activeTaskBkgColor': '#27ae60',
'activeTaskBorderColor': 'lightgrey',
'critBkgColor': 'blue',
'critBorderColor': 'lightgrey',
'doneTaskBkgColor': 'grey',
'doneTaskBorderColor': 'lightgrey',
'excludeBkgColor': '#eeeeee',
'gridColor': 'lightgrey',
'taskBkgColor': 'black',
'taskBorderColor': 'black',
'taskTextClickableColor': 'white',
'taskTextColor': 'white',
'taskTextDarkColor': 'white',
'taskTextLightColor': 'black',
'taskTextOutsideColor': 'white',
'todayLineColor': 'red'
}
}
}%%

gantt
title Hari Sekhon's Technology Skills & Experience
dateFormat YYYY-MM-DD

20+ years of Skillz to Pay the Billz : 2002-06-01, 2025-04-30

section Operating Systems
Linux : crit, 2002-12-01, 2025-04-30
Windows Active Directory : done, 2003-01-01, 2009-11-10
%%Redhat Linux : active, 2002-12-01, 2025-04-30
%%Debian Linux : active, 2003-01-01, 2025-04-30
%%Gentoo Linux : done, 2004-06-01, 2009-11-10
%%Ubuntu Linux : active, 2006-06-01, 2025-04-30
%%Alpine Linux : done, 2016-01-01, 2025-04-30
Mac : active, 2010-02-01, 2025-04-30

section Coding
Coding : crit, 2002-12-01, 2025-04-30
Bash : active, 2002-12-01, 2025-04-30
Python : active, 2005-11-01, 2025-04-30
APIs : active, 2006-06-01, 2025-04-30
%%VBScript : done, 2005-05-01, 2009-11-01
Perl : active, 2009-11-13, 2025-04-30
Git : active, 2012-06-01, 2025-04-30
%%Ruby : done, 2009-11-13, 2013-01-31
Java : active, 2013-01-13, 2025-04-30
%%Jython : done, 2013-01-13, 2015-12-31
%%JRuby : done, 2013-03-01, 2013-08-31
%%Scala : done, 2014-01-01, 2015-12-31
Golang : active, 2015-06-01, 2025-04-30
Groovy : active, 2016-01-01, 2025-04-30

%%section Build Systems
%%Make : active, 2006-06-01, 2025-04-30
%%Maven : active, 2013-02-01, 2025-04-30
%%SBT : active, 2014-01-01, 2025-04-30
%%Gradle : active, 2014-06-01, 2025-04-30

%%section Version Control Systems
%%Subversion : done, 2005-11-13, 2012-06-01
%%Mercurial : done, 2011-06-01, 2013-06-01
%%Git : active, 2012-06-01, 2025-04-30
%%GitHub : active, 2012-12-31, 2025-04-30

section Networking
Networking : crit, 2004-03-01, 2025-04-30
%%VPNs : active, 2006-06-01, 2025-04-30
%%Cisco - IOS / NX-OS : done, 2004-03-01, 2025-04-30
%%Juniper - Netscreen / SSG / SRX / ScreenOS / JunOS : done, 2007-01-01, 2013-01-18
%%Netgear : done, 2005-01-01, 2012-12-31

section Load Balancers

section Security
Security : crit, 2004-10-01, 2025-04-30
%%Kerberos : active, 2006-06-01, 2025-04-30
%%LDAP : active, 2006-06-01, 2025-04-30

section DevOps
DevOps : crit, 2005-11-11, 2025-04-30

section Data
Data : active, 2005-11-11, 2025-04-30
%%Data Validation : done, 2006-06-01, 2025-04-30
%%Data Science : done, 2013-01-18, 2025-04-30

section Architecture
Architecture : crit, 2005-11-11, 2025-04-30
Web-Scale Architecture : active, 2009-11-01, 2025-04-30
MicroServices : active, 2018-10-01, 2025-04-30
Diagrams-as-Code : active, 2023-04-14, 2025-04-30

section Databases (RDBMS)
Databases (RDBMS) : crit, 2004-01-01, 2025-04-30
SQL : active, 2004-01-01, 2025-04-30
Microsoft SQL Server : done, 2004-01-01, 2005-10-31
Oracle : done, 2005-11-01, 2009-09-10
MySQL : active, 2007-01-01, 2025-04-30
PostgreSQL : active, 2008-01-01, 2025-04-30

section Web & CDNs
Web : crit, 2005-01-01, 2025-04-30
APIs : active, 2006-06-01, 2025-04-30

Load Balancers : active, 2009-07-01, 2025-04-30
%%LVS : done, 2009-01-01, 2009-11-11
%%Foundry - ServerIron XL / 4G : done, 2009-10-13, 2011-11-31
%%F5 BigIP : done, 2010-06-01, 2013-01-18
%%HAProxy : active, 2018-04-01, 2025-04-30
%%Kong : active, 2023-03-01, 2025-04-30
%%Traefik : active, 2023-03-01, 2025-04-30

Web-Scale Architecture : active, 2009-11-01, 2025-04-30
CDNs : active, 2009-12-01, 2025-04-30
%%UlraDNS : done, 2009-11-01, 2012-06-31
%%Cotendo : done, 2012-06-01, 2013-01-13
%%Cloudflare : active, 2020-08-20, 2025-04-30
MicroServices : active, 2018-10-01, 2025-04-30

section Virtualization & Containerization
Virtualization : crit, 2005-01-01, 2025-04-30
%%VMware ESX, ESXi, VirtualBox : done, 2005-01-01, 2017-02-16
%%Vagrant : active, 2013-01-01, 2023-12-31
Containerization : crit, 2014-06-01, 2025-04-30
Docker : active, 2014-06-01, 2025-04-30
Kubernetes : active, 2018-09-01, 2025-04-30
MicroServices : active, 2018-10-01, 2025-04-30
ArgoCD : active, 2021-01-01, 2025-04-30

section IaaC & Configuration Management
Configuration Management :crit, 2006-01-01, 2025-04-30
Puppet Config Mgmt : done, 2008-09-01, 2014-02-18
Ansible : active, 2014-06-01, 2025-04-30
IaaC :crit, 2008-01-01, 2025-04-30
Terraform :active, 2019-09-01, 2025-04-30
%%Terraform Cloud : active, 2021-09-01, 2022-09-31
%%Kickstart : active, 2008-01-01, 2025-04-30
%%Preseed : active, 2009-01-01, 2025-04-30
%%AutoInstall : active, 2023-01-01, 2025-04-30

section CI/CD
CI/CD : crit, 2010-06-01, 2025-04-30
Jenkins : active, 2010-06-01, 2025-04-30
Travis CI : done, 2014-05-01, 2023-05-08
CircleCI : done, 2019-09-01, 2021-12-31
BuildKite : done, 2019-09-01, 2021-12-31
GitHub Actions : active, 2019-09-01, 2025-04-30
%%GitLab : active, 2019-09-01, 2022-12-31
%%Azure DevOps : done, 2019-09-01, 2022-12-31
%%Bitbucket : done, 2019-09-01, 2022-12-31
%%Concourse : active, 2019-11-01, 2020-03-20
%%TeamCity : active, 2020-08-20, 2021-02-31
CloudBuild : active, 2020-08-20, 2023-09-30

section Monitoring
Monitoring : crit, 2006-06-01, 2025-04-30
Nagios : active, 2006-06-01, 2019-07-31
OpenTSDB : done, 2016-09-01, 2019-07-31
Grafana : active, 2018-01-01, 2025-04-30
Prometheus : active, 2018-06-01, 2025-04-30
%%Pingdom : done, 2020-08-20, 2023-09-17
%%Datadog : done, 2022-08-20, 2023-09-17

section Big Data
Big Data : crit, 2009-11-13, 2019-07-31
Hadoop : done, 2009-11-13, 2019-07-31
%%HDFS : done, 2009-11-13, 2019-07-31
%%MapReduce : done, 2012-06-01, 2019-07-31
Cloudera / Hortonworks : done, 2012-08-01, 2020-03-20
Hive : done, 2013-01-18, 2019-07-31
HBase : active, 2013-02-01, 2019-07-31
Impala : done, 2013-04-01, 2015-06-30
Spark : active, 2014-01-01, 2019-07-31
Kafka : active, 2014-01-01, 2019-07-31
Apache Drill : active, 2014-06-01, 2018-12-31

section NoSQL
NoSQL : crit, 2009-11-13, 2025-04-30
HBase : active, 2013-02-01, 2019-07-31
%%MongoDB : done, 2013-06-01, 2013-12-31
Cassandra : active, 2013-08-01, 2025-04-30
Couchbase : done, 2013-11-01, 2024-03-01

section Caching
Caching : crit, 2009-11-31, 2025-04-30
Memcached : done, 2009-11-31, 2025-04-30
Redis : active, 2013-03-01, 2025-04-30

section Cloud
Cloud : crit, 2012-09-01, 2025-04-30
AWS : active, 2012-09-01, 2025-04-30
GCP : active, 2018-09-01, 2025-04-30
Azure : active, 2020-08-01, 2025-04-30

section Search
Search : crit, 2013-03-31, 2025-04-30
Elasticsearch : active, 2013-03-31, 2025-04-30
%%LogStash : done, 2013-03-31, 2025-04-30
%%Fluentd : crit, 2018-03-31, 2025-04-30
%%Kibana : crit, 2013-03-31, 2025-04-30
SolrCloud : done, 2013-04-01, 2024-03-01
```

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