Matthew's Weblog » Linux Misc

Myth Ubuntu Fixing

Matthew — Fri, 09 Jan 2009 04:34:24 +0000

So we had a power outage at our house, and I had to shut down my Myth backend server for the duration, and decided to try and fix its sometimes-spotty NIC at the same time. Every so often I got a completely dead response so trying to scp something there was painful… so I swapped the hardware. Unfortunately, when it came up, the machine realized the card was a new one (3c905, they’re still astoundingly reliable) and complained. First it told me it was the wrong MAC address, then it gave up and assigned it eth1. Unfortunately, all my settings were bound to eth0 and when I changed the /etc/network/interfaces to reference eth1 instead, some parts still didn’t work… mysql complained, and mvpboot just was unwilling to do anything.

Bad news.

I finally found a thread about replacing a NIC in (I think) Ubuntu 8 but when I tried the solution, the file they referred to (

/etc/udev/rules.d/70-persistent-net.rules

) didn’t exist. Back to Google.

Next I found an older forum exchange about ubuntu 6.06 NIC replacement breaking the network, and I was able to find that file:

/etc/iftab

and in it was the old MAC address. Commented the line out, restored the settings to be eth0, rebooted, and bingo I’m back in business. Wish I had found it last night…

Holy MVPMC Moly

Matthew — Mon, 29 Oct 2007 02:53:42 +0000

Wow, I was putting together my MythTV machine and it was OK until I had to get my remote front-end working. Because of the WAF, I selected a small machine – the Hauppage MediaMVP. What I didn’t recognize was that the documentation for getting it running… umm… stinks. Or at least is severely misleading (http://www.mvpmc.org/ mvpmc-HOWTO-singlehtml.html, not linked so you don’t try and use it. I should have noticed when it used software 13 versions old.). Or is really hard to find. So here’s my trials and tribulations and fixes, for anyone who is doing it.

Add to Ubuntu (Feisty Fawn) to get the mvpmc code loaded:

apt-get install atftpd tftp
mkdir /tftpboot
chmod a+rwx /tftpboot
export TFTPBOOT=/tftpboot
cd /tftpboot/
wget http://downloads.sourceforge.net/mvpmc/dongle.bin.mvpmc-0.3.3?modtime=1169 586056&big_mirror=0
ln -s dongle.bin.mvpmc dongle.bin.mvpmc-0.3.3
ln -s dongle.bin.mvpmc-0.3.3 dongle.bin.mvpmc

but then I was shocked to find that while the config files for inetd were created, there was no inetd. So…

apt-get install xinetd tcpd
apt-get install nfs-common nfs-kernel-server
cd /etc
e exports
ls /media/hdb1/mythtv/recordings/
/etc/init.d/nfs-kernel-server start
/etc/init.d/nfs-common start
update-rc.d nfs-kernel-server defaults

and then it wouldn’t read the config file. Time to add the setting to have xinetd use inetd.conf…

e /etc/init.d/xinetd
add in flag: -inetd_compat

I learned that the instructions on mvpmc.org are pretty specific to the first generation of the machine, the H1. However, those aren’t made any more… and once I got into trouble, each piece turned out to be challenges with the version. I’ve got an H3. For that, you need a special service that whispers magic incantations into the ear of the MVP. It also needs a significantly different guide… and after searching and searching (has VLC notes for future) and searching (supersweet detail, enough to choke on and more, which also gave me the link to…) I finally stumbled across on http://mvpmc.wikispaces.com/ and started getting more progress on MythTV setup… well, almost…

e mvpboot.pl

and I then went spelunking into mvpboot.pl and mvprelay.c -

perl -MCPAN -e shell
install Net::Interface
apt-get install initrd-tools gcc
dd if=dongle.bin.mvpmc-0.3.3 of=dongle.bin.ver bs=1 count=40 skip=5

So once again I’m thrilled by Debian/Ubuntu and their dependencies… as well as the prompts (when you run a nonexistent program, Ubuntu now suggests packages to install that provide the command you’re trying to use… very cool). But I hate how I rely on them, because I thought once I actually installed GCC that it would work. I finally was googling and found I was still missing one big piece:

apt-get install build-essential

and now all the compilation stuff worked and Perl was happy. Argh!

I then started fighting my drive definitions… I had partitioned my three drives in a marvelous way, redundancy for the OS and big space for the media:

Mirrors on drive 1 and 2:

100mb – /boot

2gb – swap

28gb – /

One big XFS drive (3) for media:

400gb – /media

except it appears Ubuntu uses /media for its mount space, and somehow my brain didn’t register that. So when the folder was there, I thought it would have my big space… but no. Fought with fstab a while and eventually got it so the last drive moved to /mediafiles and all started working.

Now the shiny stuff. MVPMC can stream music from a central server, too…

apt-get install slimserver

and it didn’t work that well when I put it in. All I could get was a statement from Live365 that I wasn’t logged in. Shockingly, when I went to the SlimServer instructions and did some basic configuration it worked. Who’da thunk it? I also had to chmod 777 to get it to read the media… I’ll clean that up later.

Other MythTV bits:

apt-get install mythweb mythmusic mythvideo mythplugins ogle mplayerapt-get install vlc videolan-doc

Followed the instructions on setting up vlc. It also said I needed mpslave to use aacPlus or Real Audio streams… right now I don’t need that bad enough to do the work. It’s not working yet, so I’ll have to poke it more later.

What remains? Glad you asked…

For some reason the network connection is running at 10mb Half Duplex. Since it happens with other computers on that drop I think it’s a switch or wire problem.
mplayer on my mvpmc only shows streaming radio successfully from live365 and the other XML is having parsing errors.
slimserver is cataloguing AAC files from iTunes but not playing them, even the unencrypted ones
I have to set up playlists and my local radio stations as m3u links so we can use them also… should be easy, just has to be done…
I want to get the ReplayTV and Filesystems menu items to not display, which should be doable according to the commandline argument writeup but it somehow isn’t.
Live TV isn’t running yet (but we almost never watch live TV so I don’t care much)
Get VLC working
Clean up the /mediafiles/music chmod 777 hack
Oh yeah, and getting it working with remote systems so I can drive the other two TVs. I’m going to see if I can get my hands on an AppleTV to get a richer interface for the Myth frontend and still have iTunes playback work for the stereo… that might be better for music playing. Not to mention then it will have HDMI or composite video which would be very good if we upgrade our TVs anytime in our life… sigh.

MythTV begins…

admin — Sat, 27 Oct 2007 23:17:52 +0000

so I tried putting together a media server earlier in the year (late last year?) and never quite got it going. Now, it’s up and running. I fragged the previous build and installed Ubuntu Feisty Fawn (7.04) and all the issues I had previously run into pretty much were just handled naturally. I had only one problem when I followed the community setup guide and that was that somehow I missed the significance of the Channel Frequency table selection… so when I started recording things, all I got was static and the server only recognized the VHF channels (2-13). Thankfully, I wasn’t the first to have an issue like this so I googled and found a discussion on what to do when you only see local channels. ‘us-cable’ is your friend!

Now, we’re recording. Next, remote playback on a small, wife-acceptable device.

Apache Magic

Matthew — Mon, 15 Oct 2007 03:43:30 +0000

More quick reference links to apache goodness: mod-rewrite and virtual hosts overview. Next step, hooking up the rewrite so my old-format links with multiple blogs point to the new-format post URLs. sigh.

Wordpress is simple, but it still isn’t psychic.

And I also found that Redhat has a nice overview of named for those of us still learning BIND.

The cost of Free Windows

Matthew — Tue, 21 Aug 2007 17:28:49 +0000

So an interesting contrast in articles yesterday… one column on how Windows Is Free, due to the widespread sharing and ineffectiveness of the registration process, and another column on Software Copyright and Role Models – the impact of software sharing on ethics, morals, and society. The intertwining thread is the Law of Unintended Consequences, where people’s actions have far wider ripples than they anticipate. It really stopped me in my tracks.

I have, in the past, observed unlicensed software being installed. Sometimes, because my own hands were acting on the copied CD. I’ve found it much easier to be in compliance recently because of MSDN access, but now I have kids. I want them to have a computer to use and to play on, and many of their games are Windows-only. Now I have to consider how to move forward.

I’ve purchased computers in the past with Windows installed on them, then blitzed it in order to install Linux. Now I feel like I should have a floating license for that Windows OS, but is that actually fair? I know it’s not legal according to the contracts, but what is really fair? And what do I do to show the kids that I really believe in doing what is right? I work in software development, for goodness sake… you’d think I wouldn’t be conflicted at all.

But all I have are questions right now… no answers.

(At least my Macs are legal, with no questionmarks!

Technorati Tags: Windows, Mac, Linux, ethics

Digital Storage Alternatives

Matthew — Wed, 30 May 2007 23:34:57 +0000

I’m really interested in ZFS but I don’t want to use OpenSolaris and would rather not use BSD, though I will in a pinch. As an alternative the Slashdot discussion suggests using OpenFiler (CentOS-based appliance).

Hmmm…

More MythTV stuff

Matthew — Wed, 30 May 2007 23:13:35 +0000

Good links in this discussion theoretically about MythDora 4.0 that actually ranges far and wide…

Linux packaging

Matthew — Wed, 23 May 2007 00:12:07 +0000

A quick article about the problems of Linux packaging (specifically the cross-distribution incompatibilities and the multiple option confusion), which is really only interesting because of its reference to a writeup of Conary, a package manager with revision control built in. That addresses my major gripe which is that you can’t roll back a package (RPM, DEB, etc) to a previous state and that is ridiculous in this day and age! Even Windows OS patches have uninstalls that revert back to how the system was before… and they even work more often than not!

I wonder how it will tie in with another distro than rPath Linux…

Ensuring system continuity

Matthew — Wed, 16 May 2007 00:02:03 +0000

So a couple of alternatives from a Slashdot thread about systems with settings under revision control – Puppet, which appears to actually make changes as well as track them, and cfengine [which I believe just tracks them but I'm not 100% sure and can't get to the site from work].

multi-person machines

Matthew — Thu, 10 May 2007 18:40:22 +0000

the discussion links to howto setup machines that can drive multiple heads as well as LTSP-type stuff for thin clients.