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Headless Ethminer (nVidia) Setup Guide

Cian Johnston, July 2017

A couple of weeks ago, I decided I should put my gaming rig to work crypto mining. I did not expect to make any significant profit on this, it was more of a fun project to set up. However, there were a large number of tutorials and guides already out there, and many were more than a year out of date.

This guide assumes the reader already has a crypto wallet set up, is comfortable with Linux and the command line, and knows how to use Google if they run into problems.

The end result is an Ubuntu 16.04 LTS headless server running CUDA ethminer via systemd.

Hardware

Following mining and findings performed on EVGA GeForce GTX 1070 SC GAMING Black Edition Graphics Card cards.

First run nvidia-xconfig --enable-all-gpus then set about editing the xorg.conf file to correctly set the Coolbits option.

# /etc/X11/xorg.conf
Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"

How to use a Ceph (or S3) bucket for WordPress uploads

Listed below are the steps I took to use Ceph object store for WordPress media without a plugin. It works by mounting Ceph (or an AWS S3) bucket as a network device on the file system via s3fs and using wp-content/uploads/ as the mount path.

Since s3fs is POSIX compatible, it means you can still access (and manage) the media within wp-content/uploads/ over SFTP/SSH as if they are natively there.

WP-CLI commands such as wp media import and wp media regenerate also still work.

Although your media is being stored and fetched from a network storage bucket, your web server can still resolve all the requests to wp-content/uploads/ on the local filesystem like normal.

This means that image URLs do not have to be rewritten and will use the core format you're used to over HTTP https://mysite.com/wp-content/uploads/cat.jpg and any absolute filesystem paths in PHP that may exist `/path/to/wp-content

compile ffmpeg for arm https://github.com/fiorix/ffmpeg-arm
create youtube 'live event'. get rtmp url + session id
run this:

raspivid -o - -t 0 -vf -hf -fps 30 -b 6000000 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/<SESSION>

you can tweak -b and -fps to your liking. the settings above work well for 1080p. by not specifying width or height we get the full 1920x1080 resolution from the raspi camera

	#!/usr/bin/python3
	#######################################################
	# Python rsync Backup script
	# Sebastian Kraft, 24.06.2013
	#
	#######################################################

	#-----------------------------------------------------
	# Config

	#!/bin/bash
	yum -y update
	yum -y install httpd mod_ldap mod_authnz_external mod_ssl openssl
	sed -i 's/^SELINUX=.*/SELINUX=disabled/g' /etc/sysconfig/selinux
	setenforce 0
	systemctl stop firewalld
	systemctl disable firewalld
	chkconfig httpd on
	systemctl start httpd
	yum -y install subversion mod_dav_svn

	#!/bin/bash

	# cool_gpu2.sh This script will enable or disable fixed gpu fan speed
	#
	# Description: A script to control GPU fan speed on headless (non-X) linux nodes

	# Original Script by Axel Kohlmeyer <[email protected]>
	# https://sites.google.com/site/akohlmey/random-hacks/nvidia-gpu-coolness
	#
	# Modified for newer drivers and removed old work-arounds

	#!/bin/bash

	# cool_gpu2.sh This script will enable or disable fixed gpu fan speed
	#
	# Description: A script to control GPU fan speed on headless (non-X) linux nodes

	# Original Script by Axel Kohlmeyer <[email protected]>
	# https://sites.google.com/site/akohlmey/random-hacks/nvidia-gpu-coolness
	#
	# Modified for newer drivers and removed old work-arounds

	#!/bin/bash
	# Install Spark on CentOS 7
	yum install java -y
	java -version

	yum install wget -y
	wget http://downloads.typesafe.com/scala/2.11.7/scala-2.11.7.tgz
	tar xvf scala-2.11.7.tgz
	sudo mv scala-2.11.7 /usr/lib
	sudo ln -s /usr/lib/scala-2.11.7 /usr/lib/scala