This post talks about how you can install Linode Longview on Fedora 28. Why doesn’t the standard instructions work? It turns out that you cannot just install Linode Longview on Fedora 28 as it isn’t a supported operating system. When running the automatic install script the following error will appear. Failed to synchronize cache for
This post builds on the third step to create a Raspberry Pi Cluster Node to store our configuration settings in a config file. Here we move all the configuration settings in our script into a useful .cfg file using the python ConfigParser.
I am going to upgrade our previous Raspberry Pi backup script that previously used Secure Copy to one that uses rsync. The primary reason for this is that rsync will only copy new or changed files over. This post goes through the reasons why you might want to use rsync instead of scp when performing a
This post builds on the second step to create a Raspberry Pi Cluster Node to create a hello world application across two different scripts. Here we will create a socket connection between the two and use it to send a message to the master.
Today I will be improving the basic script used to backup my Raspberry Pi’s so that it compresses the files after they have been copied. This will allow me to store several backups instead of having a single copy stored on my computer. This assumes you have followed the first tutorial to create a Raspberry
This post describes how you can upgrade Raspbian Jessie, version 8, to Raspbian Stretch, version 9. Raspbian Stretch was recently released and while they recommend installing from fresh you are able to upgrade the versions. Here I follow the steps of upgrading the Raspberry Pi’s in my cluster including some of the common problems that
This post walks you through the process of installing the Raspberry Pi OS, Raspbian, with VirtualBox. I am going to use this at times to test my software running on the OS that the Raspberry Pi Cluster runs.
I was looking to add shared folders to my Fedora VM but during mounting them there was an error. The error “access denied” appeared each time I attempted to mount the volume. This post explains why this happens and what you can do to fix it.
For my cluster project I will add a new user to each Raspberry Pi. This is so the user I use for all other systems will be the same on the Raspberry Pi’s. This post describes how to add another user to Raspbian OS.
Now I have the power supply and built the stacking system I can show off the clusters initial state. Every Raspberry Pi in the cluster Here are the 7 initial Pi’s that are to become part of the cluster. Each have been given a codename to designate its position in the cluster. The Raspberry Pi designed “M” will be
I want to be able to access my Raspberry Pi Cluster and log onto any node without entering a password. To do this I can set up as passwordless SSH key. Generating a SSH Key To generate a SSH key you can use the command ssh-keygen. Once you have ran this you will get the
The Raspberry Pi doesn’t come with its own power supply so you need to decide how to power it. The recommendation from the Raspberry Pi website is that they have “found that purchasing a 2.5A power supply from a reputable retailer will provide you with ample power to run your Raspberry Pi”. After doing some research
Something I want to do with my Raspberry Pi Cluster is mount a hard drive and share it like a windows share. To do this I am going to set up Samba on a Raspberry Pi. Installing the required packages To run samba as a service we need to install a couple packages. Running the
Here I suggest some recommended steps to install Raspbian on top of their install guide. Choosing an OS for the Raspberry Pi One of the main ways to install a Raspberry Pi OS is to download a disk image called NOOBS. This lets you choose to easily install a number of different OS’s. If you want to
If when running vcgencmd on a raspberry pi you get VCHI initialization failed then you need to add the video group to your user. The vcgencmd tool requires you have this group role so without it, it will give VCHI initialization failed. To add the user group to your user you can run: sudo usermod -aG
It appears newer linux sshd configs (fedora 22) by default include a smaller set of key exchange based mechanisms that they have turned on. This means that it gives errors saying it is unable to connect to the server. To fix this you need to enable some of the older key exchange mechanisms, Adding this line
Installing via the normal route didn’t work and meant I couldn’t easily resize the screen. Doing the below allowed me to use the resize easily. Install rpmfusion on fedora run `sudo yum install akmod-VirtualBox VirtualBox-guest` run `cd /usr/src/akmods` run `sudo rpm -ivh VirtualBox-*.rpm` Once this was installed, rebooting will give you access to shared folders and fullscreen mode
How to add a user to a group in Linux usermod -a -G Its a simple as that. So for me adding the user “chewett” to the user “vboxusers” i run the command usermod -a -G vboxusers chewett The -a flag means that the new group is appended, without it you will overwrite your current
To find the location of GeoIP for PHP you can ssh into the server and use the “find” command. find / -iname GeoIP.dat Will return a list of file paths where the file with this name is found. In my case I found: /usr/share/GeoIP/GeoIP.dat /usr/local/share/GeoIP/GeoIP.dat /opt/geoip/share/GeoIP/GeoIP.dat In my case the bottom link was the one
Vim is a wonderful command line text editor with syntax highlighting and everything you could ask for provided you turn on the functionality. Recently i was shown that it was also show trailing whitespace with a quick addition to the .vimrc file. All you need to do is add the following: set list set listchars=tab:→\
If your computer is recent and has an i3/i5/i7 intel core and a Nvidia graphics card it likely uses Optimus technology. This smart piece of software turns off the power-hungry Nvidia graphics card and runs most programs on the integrated intel graphics chip. In laptops this can save a lot of power. However this solution
Windows 7 has a really nice feature that lets you tile a window to the left or right of the screen, allowing easier placement. This is normally activated with the Windows-(left, right, up down) Arrow key combination. I had searched how to do this with XFCE for a while and today after upgrading to Fedora
After i installed Fedora 18 XFCE i found that it by default doesnt show the icons on the application menu. I normally navigate it by checking the images and not reading the words, so this inconvenienced me. On checking the properties I found that “Show icons in menu” was checked but it did not seem to
A IRC client lets you connect to a IRC server enabling you to join chatrooms on that server. IRC servers do not by default store logs while you are not logged in. This can be annoying if you wish to keep informed of whats going in on the chatroom. One solution to this is to never
During Christmas I got a raspberry pi and I have been waiting to start playing around with it for ages. Finally I decided to order the remaining pieces for it such as the power cable and SD card. Since I didn’t have a HDMI TV around I decided to plug it into the router and