Copy SSH private key to Termux

Thu, 22 Aug 2024 08:40:10 +0200

Termux is a beautiful terminal emulator Android app. As I am working mostly on the command line I wanted to be able to do the same on phone. And most importantly in a case of emergency where I don’t have access to my computer I want to able to access my servers and run some commands. This requires to setup existing SSH private keys in the Termux.

I haven’t found a good tutorial that explains how to do this. It’s actually very easy.

First you need to able to access your private key file from your phone. In my case I uploaded the file id_ed25519 to my private Nextcloud. On my phone I access the file and choose Termux to open the file.

Termux then shows this dialog:

You choose Open Directory. The file is saved in ~/download.

Before we move the file to the correct location. Make sure that you have installed the openssh package.

apt update && apt upgrade
pkg install openssh

This will create the ssh folder in your home directory and provide the ssh command.

You can then move the file.

Now you can access your server using the private ssh key.

Note that you cannot change the username in Termux and therefore need to provide the username on the server in the ssh command.

My Dogecoin experience part 1 - Mining Hardware

Thu, 08 May 2014 09:24:46 +0000

Based on a internet meme and funded as a joke the Dogecoin crypto currency is getting really serious about their business.

Just for fun I’ve bought some computer hardware to mine some doges.

Here’s a list of hardware I’ve bought in case you’re also interest in this crypto currency mining stuff.

Digitec is my local retailer in switzerland, the type of hardware is almost the same.

Hardware

GPU

Cgminer is the simplest and most effective miner to use. That’s why you should buy a AMD GPU.

MSI Computer Corp. Video Graphics Card R9 270 GAMING 2G
This is a good GPU with an average performance. A good thing to start.
Amazon $184
Digitec 186.–

CPU

Processing speed of the CPU makes no difference for mining. We just need something that can run the operating system. Plus this CPU is actually good because it uses less power.

AMD Sempron 145 Processor (SDX145HBGMBOX)
Amazon $30

AMD Athlon II X3 455 (AM2+, AM3, 3.30GHz, Unlocked)
Digitec 67.-

CPU Cooler

Arctic Freezer 13 PRO (120mm)
Digitec 48.-

Power Supply

SeaSonic Platinum SS-860XP2 Power Supply
This is a really high quality power supply. The main benefit this has over other power supplies that are a little cheaper, is that the energy efficiency is much better than what others recommend (Being Platinum Rated). This will mean your electricity is much cheaper, and over the long run it will pay for itself.
Amazon $180
Digitec 200.–

Cooler Master V850 - 850W Power Supply with Fully Modular Cables and 80 PLUS Gold Certification
Amazon $169
Digitec 187.-

Motherborad

ASUS M5A97 R2.0 AM3+ AMD 970 SATA 6Gb/s USB 3.0 ATX AMD Motherboard
This motherboard is a good choice for being cheap and able to handle the 3 graphics cards (Up to 4 actually). But you will need powered extenders.
Amazon $88

ASUS M5A99X EVO R2 (AM3+, AMD 990X, ATX)
Digitec 138.–

Hard Drive

Just big enough for the OS. Since we are just using it for mining this will be fine.

ADATA USA Premier Pro SP600 2.5-Inch 64 GB SATA III MLC Internal Solid State Drive ASP600S3-64GM-C
Amazon $49
Digitec 57.-

Ram

All we need is 4gigs or so of ram. RAM has no impact on mining, we just need enough to run the OS. You might be able to pick up a stick for slightly cheaper, but this one is good and more consistently in stock.

Kingston Hyper X Blu 4 GB 1600MHz DDR3 Non-ECC CL9 Desktop Memory (KHX1600C9D3B1/4G)
Amazon $49

Corsair XMS3 (1x, 4GB, DDR3-1333)
Digitec 44.–

Riser Cables for Graphics Cards

The motherboard has 2 PCI-Express x16 and 2 1x slots. So you can go with 2 PCIE “1x-16″ risers and 1 PCIE “16x-16x” Riser or vice versa. I went with 1- x16 riser and 2 x 1 to 16 riser to reduce power usage through the motherboard. It is important for the 1x to 16x ones are powered, so that your motherboard isn’t overloaded. Risers are also necessary to help disperse heat.

Qody PCI-E Extension Cable: 1X to 16X (powered)
Amazon 5$

Micro SATA Cables - PCI-E Express 16X Riser Card with Flexible Cable
Amazon 8$

Case

Most miners go with a simple milk crate to hold their components.

Sterilite 16929006 Storage Crate, Black
Amazon $12

Wireless Card (optional)

Make sure the wireless card is PCI, not PCIE, so if you want to add another graphics card later, you won’t be using a PCIE slot by your wireless card.

TP-LINK TL-WN951N Wireless N300 Advanced PCI Adapter, 2.4GHz 300Mbps, Include Low-profile Bracket
Amazon $28

TP-LINK TL-WN851ND, n300 (PCI) Digitec 22.-

Software

I’ll recommand to install a Windows 7. Everything else required is opensource.

Source

http://www.minedogecoin.com/building-a-nice-dogecoin-mining-rig-for-1000-dollars/
http://www.minedogecoin.com/top-graphics-cards-in-stock/

Get the latest version of this list here: https://gist.github.com/447c906e16c2c8be5719

Crypto on Janik von Rotz