Docker is a very useful containerisation platform. I use it so much that I regularly fill up /var/lib/docker with old images and get out of disk space errors. Unfortunately Docker has no automatic garbage collection mechanism to clean up unused images. I wrote a simple shell script which I run from time to time.
August 1, 2016
July 15, 2015
A simple configuration to regular check all local disks for errors. Any problems will go to syslog/journald as well as being emailed to root.
July 1, 2015
Many years ago Internode started offering IPv6. This is proper dual stack IPv6 with a /56 block of addresses. I get 256 subnets, each with 2^64 addresses. Awesome! I signed on for the trial immediately and got it working without too much difficulty. The documentation wasn’t great though, so here’s how I my setup works today.
June 15, 2015
Once upon a time there was a tool called deborphan. It finds orphaned packages which could be removed from the system. You can maintain a list of ‘keepers’ to stop it suggesting removal of things that you want.
I wanted to extend this to work with the builtin “auto-installed” flag that aptitude stores for all packages. I also wanted it to work with Arch Linux.
July 25, 2014
Guest post by lemnisca.
I’ve recently started getting into Linux wireless programming for work. I am a fairly experienced C programmer but don’t know much about kernel development so this is a new adventure for me. What I found was that while there is a lot of information available about how it all works — indeed, since it’s open source, one can at least in theory have complete information about the functioning of the system — there is not much in the way of an introduction. There’s no broad explanation of how it all works for someone completely new to the system. The documentation that does exist is largely focused on documenting individual functions, structs, etc. and is more of a reference for those already familiar with the system. I quickly found myself lost in a sea of source code, chasing down chains of function calls with no real feel for how the whole thing is put together. So I’ve decided to share what I’ve learnt, in the hopes that it might help someone else in the future.
April 7, 2014
About a year ago when I first bought my Bluray drive for Linux I had a simple requirement. I wanted to be able to put a disc in, then with some graphical tool select a track and have it start playing. It turns out nothing on Linux can do this.
March 24, 2014
A small Python script to connect to the internet over Bluetooth DUN (dialup networking) using my Nokia Symbian phone and my Linux laptop.
This was written on Arch Linux but should work elsewhere too. It uses bluez5 to enable bluetooth, rfcomm to create the serial port and wvdial to create the PPP connection and manage routes/DNS. Many newer phones use Bluetooth PAN instead of DUN so this method won’t be applicable.
Once upon a time this all worked automagically with NetworkManager. Since bluez5 it fails with this error:
Method "Connect" with signature "s" on interface "org.bluez.Serial" doesn't exist
Apparently we’re supposed to use the new Serial.ConnectFD DBUS API instead.
January 16, 2014
My latest project was to have wireless audio streaming from my Symbian mobile phone over Bluetooth to a a new set of speakers. I used PulseAudio, Bluez5 and Arch Linux running on a Raspberry Pi. It all works really well. I can connect/disconnect from the phone and everything is automatically started on boot. I’m enjoying it now as I type this.
Thanks to Greg & Helen for the Christmas present! :)
January 1, 2013
After upgrading my file server from Ubuntu 10.04 Lucid to Ubuntu 12.04 Precise I had a few problems with Samba. Mac OS X 10.6 clients were very very slow. A 1MB file would take several minutes to transfer completely, making browsing photos and general use impractical. Windows (Vista and 7) clients could not connect at all, the file server did not appear in the browse list and typing the name manually did not work either. Unsurprisingly, Linux Samba clients worked perfectly.
July 23, 2012
I use rdiff-backup to keep a copy of the latest version of all my files and compressed differential backups going a year in the past. This works great except when I have a GNOME login and a ~/.gvfs directory. These are special FUSE directories that root user cannot even enter or even lstat(), which causes an annoying error to be emailed to me every night.
I finally got sick of this and have hacked a solution, I’m not proud of it, but it’ll make the emails stop!
$ curl -L --silent https://delx.net.au/code/rdiff-shutup.patch | sudo patch --backup -p0