Functional architecture
Elixir
Posted on March 14, 2023
| 5 minutes
| 948 words
| Iulian Costan
A functional architecture design with a "functional core" layer for business logic, then a "state servers" layer for state management and finally an "imperative shells" layer for side-effects.
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Personal VPN server
Linux
Posted on February 28, 2023
| 3 minutes
| 596 words
| Iulian Costan
I was not a big fan of traditional VPN services (which are highly centralized and slow) until Wireguard has arrived and was merged into Linux Kernel; a VPN for this century, peer to peer with state of the art cryptography.
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Risk-adjusted performance metrics
Finance
Posted on January 27, 2023
| 4 minutes
| 690 words
| Iulian Costan
You can easily double the investment and also double your return right? Not really… read on to see a few metrics that I use.
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Wildcard SSL certificate
Linux
Posted on December 19, 2022
| 6 minutes
| 1097 words
| Iulian Costan
Self-generated certificate is good for bootstrapping purpose but sooner than later we need a valid SSL certificate for all services (IMAPS, HTTPS, DoT etc).
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5kW off-grid photovoltaic system
DoItYourself
Posted on November 17, 2022
| 2 minutes
| 305 words
| Iulian Costan
DoItYourself photovoltaic 5kW off-grid system with components, references, specifications, materials, cost breakdown by each component and more.
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Annapurna circuit - the aftermath
Trekking
Posted on October 31, 2022
| 4 minutes
| 797 words
| Iulian Costan
Here is day by day itinerary with trekking information, cost for food/drinks/accommodation and also a few DOs/DONTs…
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Firewall, monitor, ban. Repeat.
Linux
Posted on September 7, 2022
| 4 minutes
| 718 words
| Iulian Costan
Having an internet facing public server requires a bit of monitoring and security to keep bad actors out.
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Annapurna circuit - the training
Trekking
Posted on August 17, 2022
| 3 minutes
| 431 words
| Iulian Costan
Here is the 4-week training plan for Annapurna Circuit, a bit different than Gasherbrum2 training plan for a few reasons:
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Annapurna circuit - the gear
Trekking
Posted on August 8, 2022
| 3 minutes
| 628 words
| Iulian Costan
Here is the final gear list for Annapurna Circuit keeping in mind that we will experience multiple climates:
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Personal DNS server
Linux
Posted on August 1, 2022
| 6 minutes
| 1113 words
| Iulian Costan
After personal Email server the next thing to setup is a Domain Name Server (DNS) server for costan․ro domain with DNSSEC, TLS and everything in between.
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