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Ethereum mining on Ubuntu

/ Sven Boesiger / Blockchain

Due to the attractive price of Ethereum these days is decided to start mining the cryptocurrency once more – after some experience with Bitcoin back in 2013. I calculated this morning that at a price of 220 CHF/ETH, I end up with 0.06 CHF profit/h (that is mining-revenue minus hourly energy costs). Mining on Ubuntu […]

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Moving Ethers to a Local Linux Ethereum Wallet

/ Sven Boesiger / Ubuntu

In the light of the massive surge in the price of Ethereum (ETH) in the last weeks I wondered if my online wallet provider was in fact buying the digital currency for me. I didn’t feel that sure, since betting on a burst of the bubble anytime soon could yield massive profits for these online […]


RSync Support on Zyxel nsa325-v2 NAS

/ Sven Boesiger / NAS

Unfortunetly the Zyxel nsa325-v2 NAS doesn’t anymore support rsync capabilities out of the box. It can be reinstalled though (even on the latest firmware 4.80) with the help of the ffp package. To be able to use it I added a file called “web_prefix” containing the following line into the admin/zy-pkgs folder: Afterwards I […]


MongoDB: Too many open files under Ubuntu 15.04

/ Sven Boesiger / MongoDB, Ubuntu

Lately I had troubles with MongoDB after my database exceeded 2TB and started to constantly complaining about “too many open files“. In order to fix this issue I appended the following lines to “/lib/systemd/system/mongodb.service”: [Service] # Other directives omitted # (file size) LimitFSIZE=infinity # (cpu time) LimitCPU=infinity # (virtual memory size) LimitAS=infinity # (open files) […]


Decypher Salted OpenSSL Files with C++

/ Sven Boesiger / C++

I like my encrypted files salty: Especially when stored in the cloud this add protection against rainbow table attacks. Usually I encrypt my files therefore with: openssl aes-256-cbc -salt infile -out outfile It took my quite a while to figure out how to open these files in C(++). The following lines show how to open […]