Build your own Ethereum Mining Rig, part 2: Linux Setup

In this second installment of our DIY Ethereum mining guide, we’ll look at how to install and configure Linux to setup your rig as an automated, remotely-manageable appliance. Don’t be dissuaded if you’ve never used Linux before—our step-by-step guide makes it simple!
Why Linux over Windows? First, it’s free—and saving ~$100 on the operating system is a big plus when you’re trying to maximize profitability. Other reasons include lesser hardware requirements (Linux is perfectly happy running from a USB stick plugged into ancient hardware!), simpler remote administration capabilities, and oftentimes better stability. The downside of running Linux is that video driver support isn’t on the same level as Windows, and things like GPU undervolting are trickier (but still possible via BIOS mods).
If you missed the hardware portion of our guide, make sure to check it out first. Otherwise, read on.

Build an Ethereum Mining Rig, part 2: Linux Setup

The following is heavily adapted from my original 2013 Litecoin mining guide, updated for the latest Xubuntu LTS version, the new AMDGPU-PRO drivers, and necessary ethereum mining software. If you’re a bit nervous because you’ve a complete Linux newbie, don’t be. Simply follow the step-by-step instructions exactly as they’re written, and you’ll be fine. Even if you’ve never done anything like this before, you should be up and running in roughly an hour.

Step 1: Configure BIOS settings

Before we even get to Linux, let’s take a minute to make sure that your mining computer’s BIOS settings are in order. Power on your computer, and press the “delete” key a few times immediately after power on. You should end up in the BIOS configuration area. Do the following, then save & exit:

Change power options so that the computer automatically turns itself on whenever power is restored. The reason for this is two-fold: first, it’ll make sure that your miner automatically starts up after a power outage. Second, it makes powering the computer on much easier if you don’t happen to have a power switch connected to the motherboard.
Make sure that your USB stick is first in the boot-up order (you may need to have a USB stick attached).
Disable all components that you don’t plan to use. This may save a little bit of power, and since your miner will likely be running 24/7, it’ll add up. For me, that meant disabling onboard audio, one of the SATA controllers, the USB 3.0 ports (I only had a 2.0 USB stick), the Firewire port, and the serial port.
If you’re running a lot of GPUs (4+), additional tweaks might be necessary to ensure that they’re all recognized by the OS. Exact tweaks vary by motherboard, but setting the PCIe speed to Gen1 is usually a good place to start. No need to change anything now, but make a mental note that you may need to come back and play around a bit if all of your GPUs don’t show up in the OS later.

Step 2: Install Xubuntu Desktop on your miner

Xubuntu is a lightweight version of Ubuntu, a popular Linux distribution. Most other distros should work just fine, but be aware that the GPU drivers require the presence of Xorg, which means server distros that don’t have a GUI will not work properly.

Xubuntu 16.04.2 is the latest LTS release at the time of this guide, so that is what I recommend you use. You can download it here.
You’ll need to either write the installation ISO image to a USB stick (highly recommended), or burn it to a DVD. If you use a DVD, you’ll need to temporarily hook up a DVD drive to your mining rig for the installation (make sure you temporarily enable your SATA controller if you disabled it in step 1!).
Once you have the installation media prepared, you’re ready to install Xubuntu to your miner’s boot device (whether it’s an SSD, mechanical harddrive, or another blank USB stick). Boot using your new installation media (make sure it’s first in your miner’s BIOS boot order list). The Xubuntu installer should appear.
Follow the prompts, and make sure to click the “auto-login” box on the last step of the installer (otherwise, all of the default options are fine).
When the installation is complete, you should automatically boot into the Xubuntu desktop. Make sure to remove your installation media.

Step 3: Install SSH and package updates

At the Xubuntu desktop, press CTRL+ALT+T to open a terminal window.

Install SSH by typing:
```
sudo apt-get install openssh-server
```

With SSH installed, you can unplug the keyboard/mouse/monitor from your miner, and complete the rest of the installation from your desktop computer. Simply download Putty onto your desktop, run it, and enter the IP address of your mining rig (type ifconfig at the Xubuntu terminal to find your miner’s address if you don’t know it—it will probably look like 192.168.0.x). That should bring up a remote terminal session to your miner, which is more or less just like sitting at the keyboard in front of it.
If you plan to manage your mining rig remotely over the internet, you’ll need to forward port 22 on your router to your miner. Make sure that you use a strong Xubuntu password!
Setup should be pretty quick from this point, as now you can simply copy text from this webpage (highlight it and press CTRL+C) and then paste it into your Putty session by simply right-clicking anywhere inside the Putty window. I highly recommend that you complete the remainder of the guide in this manner, as it eliminates the risk of typos!

Install package updates by typing (or copying & pasting via right-click into Putty) the following commands:
```
sudo apt-get dist-upgrade
```

Step 4: Install AMDGPU-PRO drivers

Next up, we’ll install AMD’s video drivers. I tested several versions and found that the latest release (17.10 as of 6/9/2017) gives the best performance. So that’s what we’ll use.

Type the following commands (press “enter” and wait for the operation to complete at the end of each line):

cd ~/Downloads
wget --referer=http://support.amd.com https://www2.ati.com/drivers/linux/ubuntu/amdgpu-pro-17.10-414273.tar.xz
tar -Jxvf amdgpu-pro-17.10-414273.tar.xz
cd amdgpu-pro-17.10-414273
./amdgpu-pro-install -y

Some of these steps may take a minute or two to complete. When the installation is complete, type the following:
```
sudo usermod -a -G video $LOGNAME
sudo reboot
```

The second command will reboot your rig, which will cause you to immediately lose your SSH (Putty) connection. Wait a few seconds to give the computer a chance to boot, and then re-establish a new connection via Putty, and re-login.

Step 5: Install Ethereum software

Next up, we’ll install the Ethereum software that will let us create a new wallet address. We’ll need this to store the coins we receive from mining.

Type the following to install the necessary ethereum packages:

sudo add-apt-repository ppa:ethereum/ethereum
sudo apt-get update
sudo apt-get install ethereum geth

Now it’s time to create your Ethereum wallet address:
```
geth account new
```

You’ll be prompted to enter a password, and then to confirm it (use a strong password!). The output will be a long string between two curly braces { }. That’s your new wallet address—make a note of it (highlight it within Putty to copy it to your clipboard).
Important: The combination of the password you just used to create this address *and* the associated encrypted key file is what gives you control over your new wallet address. If you lose either of these, you’ve also lost control of your wallet and all of the coins associated with it—and there is literally nothing that anyone will be able to do to help you. Remember your password, and keep multiple backups of your key file(s)!
Your key file(s) are stored in the ~/.ethereum/keystore directory. Copy the entire /keystore folder someplace safe to backup your wallet (I’ll cover backups in detail in a later section of this guide).
If you ever forget your wallet address, you can type geth account list to see your addresses and the location of their key files.

Step 6: Install Claymore’s Ethereum miner

There are several options as far as mining software, and I’ve experimented with all of the popular ones. I think Claymore’s miner is the best option, even if it does have two fairly significant downsides: it’s closed-source, and it’s not free (~1% of your mining time benefits the creator of the miner).
Two alternatives are the stock ethereum miner (ethminer) and Genoil’s fork of the stock miner. They’re both open-source and free, but they have pretty crippling downsides.
The stock ethminer is much slower than Claymore’s miner (by a margin of over 5% on my test rig). In addition, ethminer creates the Ethereum DAG file on disk instead of in GPU memory, which is slow and uses a lot of space (and if you’re running off a USB stick, all those writes may eventually wear it out).
Genoil’s fork seems to be nearly as fast as Claymore’s, and it doesn’t use physical disk space for the DAG, but it’s not stable (at least not for me). It often crashes, especially on startup (whereas I have yet to see a single crash on Claymore’s miner after nearly a week of full-time mining). The author abandoned development months ago, so improvements are unlikely.
So, explanation aside, here is how to setup Claymore’s miner:

First return to your downloads directory and grab the latest version (9.5 as of 6/9/2017):

cd ~/Downloads
wget https://github.com/nanopool/Claymore-Dual-Miner/releases/download/v9.5/Claymore.s.Dual.Ethereum.Decred_Siacoin_Lbry_Pascal.AMD.NVIDIA.GPU.Miner.v9.5.-.LINUX.tar.gz

Then create a new directory for it, and unpack it there:

sudo mkdir /usr/local/claymore95
sudo tar -xvf Claymore.s.Dual.Ethereum.Decred_Siacoin_Lbry_Pascal.AMD.NVIDIA.GPU.Miner.v9.5.-.LINUX.tar.gz -C /usr/local/claymore95

Then let’s head over to the installation directory and create a startup script:
```
cd /usr/local/claymore95
sudo chmod u+s ethdcrminer64
sudo nano mine.sh
```
Nano will open a new blank text file; enter the following into it:
```
#!/bin/sh
export GPU_MAX_ALLOC_PERCENT=100
./ethdcrminer64 -epool us1.ethermine.org:4444 -ewal YOUR_WALLET_ADDRESS.Miner01 -epsw x -mode 1 -tt 68 -allpools 1
```
Where it says YOUR_WALLET_ADDRESS, use the address you created in step 5 (you’ll need to put “0x” in front of it). The “Miner01” following your address can be changed to any friendly label that you want to give your miner (only important if you plan to run multiple rigs). It’s easiest to copy the last line from my guide into something like notepad, then replace YOUR_WALLET_ADDRESS with your actual address there, and then copy the finished line into putty via right-click to get everything into nano without typos.

Save the file and quit nano by pressing CTRL+X and then answering (Y)es to save the changes, then enter the following to give your new script execute permission:
```
sudo chmod +x mine.sh
```

Note that I’m using ethermine.org as the mining pool here. It’s a fairly typical ETH pool that seems to have good reliability, but feel free to pick your own pool. Most don’t require registration, and simply payout to whatever wallet address you supply whenever a certain threshold is met (usually whenever you accumulate 1+ ETH). Assuming you stick with ethermine.org, you’ll be able to check on your miner’s status by going to this URL after you start mining: https://ethermine.org/miners/[YOUR WALLET ADDRESS]

Now is a good time to test things. You can fire up your miner by typing:
```
./mine.sh
```

You should see the Claymore miner start up. It’ll take a minute or two before it actually starts mining, but it should get there eventually. When you see a scrolling log of outputs that includes non-zero hashrates (expect hashrates in the low to mid 20s for unoptimized GPUs), you’re good to go. If the script fails to start, or you see errors, make sure that you’ve created the script exactly as outlined in the guide.
Press CTRL+C to exit the miner when you’re satisfied that it’s working.

Step 7: Create auto-start scripts

We’re almost done! We want to set up our rigs automatically start mining whenever the rig is powered on. That way, we keep mining losses to a minimum whenever a power outage occurs, and we don’t have to worry about manually starting it back up in other situations.

First, install screen:
```
sudo apt install screen
```
Then type the following to create a new script in your home directory and open it in nano:
```
cd ~
sudo nano miner_launcher.sh
```

Enter the following text into the editor (substitute your actual Xubuntu username for YOUR_XUBUNTU_USERNAME where necessary!):

#!/bin/bash
DEFAULT_DELAY=0
if [ "x$1" = "x" -o "x$1" = "xnone" ]; then
   DELAY=$DEFAULT_DELAY
else
   DELAY=$1
fi
sleep $DELAY
cd /usr/local/claymore95
su YOUR_XUBUNTU_USERNAME -c "screen -dmS ethm ./mine.sh"

Save and quit nano (CTRL+X), and then type:
```
sudo chmod +x miner_launcher.sh
```
Now we need to call our new script during startup; we do that by adding it to /etc/rc.local. Type the following to open /etc/rc.local in nano:
```
sudo nano /etc/rc.local
```
Add the following text, right above the line that reads “exit 0” (substitute your own username!):
```
/home/YOUR_XUBUNTU_USERNAME/miner_launcher.sh 15 &
```

Then save and quit out of nano (CTRL+X).

Step 8: Create an alias to easily check on the Claymore miner process

We’re essentially done at this point, but you’ll probably want to manually SSH into your miner from time to time to manually check on your hashrates & GPU temperatures, etc. Creating an alias will make that easy.

Type:
```
sudo nano .bashrc
```
Scroll to the end of the file, and then add this text above the line that reads “# enable programmable completion…”
```
alias miner='screen -x ethm'
```
Save and quit out of nano.

That’s it—you’re done! You’ll probably want to run a full test now. The easiest way to do that is to close your Putty session and power down your miner. Turn it back on and the following should happen:

Your miner should boot into Xubuntu. This may take up to a minute, depending on the speed of your boot device (it’ll be much faster on an SSD).
15 seconds after Xubuntu has loaded, the Claymore miner will automatically start and begin mining. You might notice the fans on your GPUs spin up a bit when this happens.
You should be able to SSH into your miner at any time and type miner to monitor the miner’s process. To close the screen (but keep the miner running), press CTRL+A, then CTRL+D.
If you ever need to start the Claymore miner manually (because you quit out of it, or kill it, etc), simply type ~/miner_launcher.sh

Output from a single budget RX 470 at stock settings running Claymore’s ETH miner. You should see something like this when connecting to your rig via SSH and running your “miner” alias.

Congratulations—you have your own headless linux ethereum miner!

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