Quick Fix for Useless Salt Warning – Add “file_ignore_glob: []” to /etc/salt/master

Some versions of Salt give you a useless warning on every run. The problem is easy to fix.

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Run Salt SLS File Locally – sudo salt-call –local state.apply foo

What if I just want to run a single SLS file (salt state) once? Save your state to /srv/salt/foo.sls and apply it $ sudo salt-call –local state.apply foo This masterless setup is just for quick testing. In production, you would use … Continue reading

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Salt States – I Want My Computers Like This

Describe how you’d like your computers, and Salt will configure them. For example, I want Apache web server, with PHP and user homepages, on all my computers whose name starts with ‘web’. To say the same in jargon: write your … Continue reading

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Salt Quickstart – Salt Stack Master and Slave on Ubuntu Linux

You can control a thousand computers with Salt. And this is how you install Salt. Slaves, the controlled computers, can be anywhere: behind an NAT, behind a firewall, on an unknown address. And still you can control them. Only the … Continue reading

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Aikataulu – Palvelinten hallinta ict4tn022 4-ti 5-ke 5 – loppukevät 2018 5p

Control 10 computers. Or 100. Or 1000. Just write what you want (idempotency). Control almost everything with one system (single source of truth). In plain text (infrastructure as code, versionable). My current research area is configuration management systems: I gave … Continue reading

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Arvioitava laboratorioharjoitus – Linux palvelimet ict4tn021-6 torstai – alkukevät 2018 – 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. Student feedback was excellent: … Continue reading

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Arvioitava laboratorioharjoitus – Linux palvelimet ict4tn021-7 tiistai – alkukevät 2018 – 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. Student feedback was excellent … Continue reading

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Penetration Testing Course – Autumn 2018

I will teach the new penetration testing course. Name: Penetration Testing – Tunkeutumistestaus Code: ict4tn027-1 Teaching language: Finnish Location: Computer lab pa5004, Haaga-Helia, Pasila, Helsinki Time: Autumn 2018

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Arvioitava laboratorioharjoitus – Linux palvelimet ict4tn021-8 maanantai – alkukevät 2018 – 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. Student feedback was 4.7 … Continue reading

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My Book in Design Museum

My book, Getting Started with Sensors, is on display in Design Museum. Visit Design Museum (fi: Designmuseo) in Korkeavuorenkatu 23, Helsinki. Thanks for taking & sending me the photos. I have co-authored the book with Kimmo Karvinen.

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“IoT Rapid Prototyping Laboratory Setup” published in the International Journal of Engineering Education

Your first Internet of Things prototype in four days? Yes, even beginners successfully built IoT systems from their own ideas. International Journal of Engineering Education published an article I co-authored with Kimmo Karvinen. The article explains BotBook method in the … Continue reading

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Translate Titles on Wikipedia – Firefox Addon

Add links to English and Finnish translations on Wikipedia. Add-on for Firefox. Download from official Firefox Add-ons site. The rest of this article is “making of”, interesting if you want to learn to write your own Firefox extensions. I wrote … Continue reading

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Suricata IDS on Ubuntu – Easily with apt-get, oinkmaster and systemctl

Suricata is a modern intrusion detection system (IDS). It sniffs your network traffic and logs suspicious packets. Suricata uses Snort rules, so you can have a lot of them for free. Rules are installed automatically with OinkMaster. This article shows … Continue reading

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Message of the Day on Ubuntu – sudoedit /etc/motd; chmod ugo-x /etc/update-motd.d/*

Message of the Day (motd) is displayed when you log in with ssh. You can use plain text message of the day in /etc/motd also in Ubuntu. Disable scripts in /etc/update-motd.d/ to get rid of extra stuff. When automatically configuring … Continue reading

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Creating Legacy Boot Xubuntu USB – UnetBootin and bootable FAT32 partition

Xubuntu Linux can boot from USB disks, even without installing to hard drive. It supports both BIOS and UEFI boot. For most USB sticks, you can just use UnetBootin after taking the USB from the package.

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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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