Faster ‘vagrant up’ with apt/deb Package Proxy

Create virtual machines faster by caching deb packages. Use squid-deb-proxy on host OS, then add an apt.conf.d/ config file to make guest OS apt-get use your proxy. Following these notes requires fluency with command line, sudo, daemons and vagrant.

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200 Lines of Code Saves 20 000 EUR

My student Joram Puumala wrote a program to automatically configure routers. The CEO of NDC Networks, Markus Ahonen: “NDC is expecting to deliver over 5000 routers during 2018, so the calculable savings in direct effort are significant. Especially as handling … Continue reading

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Naughty Questions and Easy Way to Forest – Apps for Android

Hurt your leg, baby in the cart and you still want to go walking in the woods? Moving with a wheelchair? Old? If you are based in Helsinki, check out HelpostiLuontoon.fi. My students Jenni Saarinen, Elina Rajuvaaara and Kristina Lindfors … Continue reading

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Configuration Management Course Awards 2017: Most slaves: Tommi, most OSes: Matias

Tommi Timonen had the most slaves, a total of 1478 computers. He had 20 physical computers running many virtual computers each. Congratulations Tommi! Tommi also took second place with his previous setup of 639 computers. Third place was Tatu Erkinjuntti … Continue reading

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Automaticaly Build Penetration Testing Environment – Kali, Metasploitable, Vagrant

My student Toni Jääskeläinen developed a PenTest environment that can be set up automatically. Based on my idea, it’s distributed as a single Vagrantfile. Using pentest tools requires special care and skill, as even mistakes with some of these tools … Continue reading

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Automation of Router Configuration with Python & SSH

My student Joram is automating router configuration for NDC Networks. Joram configures Advantech B+B routers for NDC’s clients. The configuration is done using custom built Python Paramiko SSH script. The routers are configured for clients of NDC, an 8 person … Continue reading

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Tommi’s 639 Puppet Slaves

My student Tommi tested Puppet with 639 slaves. Tommi is running some 20 physical computers with about 30 virtual computers each. Tatu has 263 slaves – on a single physical machine with a huge swap file. Who will get 640 … Continue reading

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Top Configuration Management Systems – Puppet vs Salt vs Ansible vs Chef

The leading configuration management systems compared: Puppet, Chef, Ansible, Salt. My students Joona, Jori, Eero and Jarkko gave a presentation and demonstrated each system. ArcticCM provisioned and configured a couple of Linux desktops and servers, and also configured some Windows … Continue reading

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Provision Multiple Virtual Puppet Slaves with Vagrant

For testing, it’s convenient to provision many virtual slave computers to your master. This Vagrant file installs two virtual computers and automatically configures them as slaves to a puppetmaster in a predefined IP address. Advanced stuff warning: Using this sample … Continue reading

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Multiple Virtual Computers in Minutes – Vagrant Multimachine

You can install multiple virtual computers in minutes. This example shows how to install two Ubuntu 16.04 virtual machines and configure SSH – in a couple minutes.

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Aikataulu – Monialaprojekti Infra pro4tn001-5 – kevät 2018 – 10 op

English: Complete a project with a company as a client. Work with students from different tracks and backgrounds. Course in Finnish. Tee projekti yritysasiakkaalle ryhmässä, jossa on opiskelijoita eri aloilta.

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Aikataulu DigiStartUp digt4tn024-3 – keväällä 2018 – molemmat 1p ja 2p – 10 op

English: Create your own digital product and find paying customers. Real customers, actual money. Course is in Finnish. Luo digitaalinen tuote ja hanki sille maksavia asiakkaita. Siis oikeita asiakkaita, joilta saa oikeaa rahaa.

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Aikataulu – Linux palvelimet ict4tn021 7-ti ja 6-to – alkukevät 2018 – 5 op

English: Learn to manage your own Linux server – in 8 weeks. Beginners welcome. Student feedback excellent 4.7 out of 5. Course is in Finnish. Aloita nollasta. Opiskele 8 viikkoa ja hallitset omaa Linux-palvelinta. Opintojakson suoritettuaan opiskelija: Osaa hallita Linuxia … Continue reading

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Aikataulu – Linuxin keskitetty hallinta – 3 op, vanha OPS – loppusyksy 2017 p5 – Puppet

Control 10 computers. Or 100. Or 1000. Use Puppet, the tool used by US Gov (security baseline), Mozilla, Google (laptops and desktops) and Wikipedia. Just write what you want (idempotency). Control almost everything with one system (single source of truth). … Continue reading

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Starting with JavaScript – Arrays, for..of, F12 console

JavaScript gets you to results easily. It’s the native language of web pages. You can create and sell Android Apps easily by packaging your HTML and JavaScript with PhoneGap/Cordova. All popular (1000+ installs) cell phone apps in my courses have … Continue reading

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Initial Testing and Tries on MySQL Socket Authentication

MySQL has some initial support for passwordless socket authentication, but based on by very brief and initial testing, it does not seem to be ready for prime time yet. If you want socket authentication, PostgreSQL does socket authentication out of … Continue reading

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Simpler Puppet Manifests – Resource Defaults and Manifest Ordering

Tips to make your Puppet manifests shorter and easier to read. Resource defaults: If I say ‘package’, of course I want it installed. Services are usually running and enabled at boot. Manifest ordering: Top-down, so I don’t have to ‘require’ … Continue reading

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Apply Puppet Resources Top Down – ordering=manifest – Order without Require

By default Puppet manifest ordering is arbitrary. You either have to use require a lot or apply your modules twice. But there is an easy fix: $ sudoedit /etc/puppet.conf [main] ordering = manifest # …

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Aikataulu – Palvelinten hallinta ict4tn022-3 – 5 op, uusi OPS – loppusyksy 2017 p5

Control 10 computers. Or 100. Or 1000. Use Puppet, the tool used by US Gov (security baseline), Mozilla, Google (laptops and desktops) and Wikipedia. Just write what you want (idempotency). Control almost everything with one system (single source of truth). … Continue reading

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Arvioitava laboratorioharjoitus – Linux palvelimet ict4tn021-5 torstai – alkusyksy 2017 – 5 op

This is the evaluated lab exercise for Linux Server Administration course, 50% of grade. Student had a Live USB stick and an empty computer, and he could use the public Internet. No other tools were allowed. Course feedback was excellent … Continue reading

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Arvioitava laboratorioharjoitus – Linux palvelimet ict4tn021-4 tiistai – alkusyksy 2017 – 5 op

This is the evaluated lab exercise for Linux Server Administration course, 50% of grade. Student had a Live USB stick and an empty computer, and he could use the public Internet. No other tools were allowed. Course feedback was excellent … Continue reading

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Acute 0.2.2 – Integrate Help Commands to Single Interface – pydoc3, puppet describe and man in GoldenDict

Access all documentation commands and dictionaries trough a single interface. Acute(1) suppresses output if it’s just “documentation not found”, so your interface stays clean. With GoldenDict and acute, you can see real time queries to help commands along offline programmer’s … Continue reading

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Print Special Characters as Backslash Escapes – Python3 One-liner with Unicode Support

Let’s find that weird or invisible character that breaks your code $ echo “Hello in Finnish: Päivää”|python3 -c ‘import sys; s=sys.stdin.read(); print(s.encode(“unicode_escape”));’ b’Hello in Finnish: P\\xe4iv\\xe4\\xe4\\n’

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Commands in GoldenDict – Offline Dictionary of man, grep, pupppet help and your commands

NEW: There is a new, better version of this article and program. Add Python reference, man pages and your own commands to dictionary. This example shows how to add commands as dictionaries to GoldenDict. Commands show information for the exact … Continue reading

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pydoc3 str – Python Reference in Your Command Line – Airplane & Cottage Entertainment

You can read Python documentation offline with pydoc3. It’s installed automatically with Python, and it always shows documentation for the version of Python you have installed. $ pydoc3 str You can see reference for a library ‘pydoc3 re’ or a single … Continue reading

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