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 slmingol posted this in tips & tricks on May 14th, 2013, @ 5:31 pmBackground
UEFI looks to be a major pain in the @$$, but like it or hate it everyone in the Linux community will need to learn to navigate it. Here’s a list of useful UEFI resources that I’ve come across as I’ve started to get smarter about how to deal with this beast.
Solution
Wikipedia
Ubuntu Docs
AskUbuntu
Rodsbooks.com
Misc.
NOTE: For further details regarding my one-liner blog posts, check out my one-liner style guide primer.
slmingol posted this in package management on April 2nd, 2012, @ 8:59 am
Background
If you do any software development work that requires the use of subversion then you may have heard of rabbitvcs. It’s one of the best subversion clients that integrates well with nautilus, under GNOME. I’d been running into an issue however where it wouldn’t allow me to perform a comparison of my checked out working directory and the subversion repository. I was running into this with version 0.14.2.1-3 on my Fedora 14 laptop.
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| % rabbitvcs diff WebDataInterface.java@105 WebDataInterface.java@112
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/rabbitvcs/ui/diff.py", line 322, in <module>
diff_factory(options.vcs, pathrev1[0], pathrev1[1], pathrev2[0], pathrev2[1], sidebyside=options.sidebyside)
File "/usr/lib/python2.7/site-packages/rabbitvcs/ui/diff.py", line 304, in diff_factory
return classes_map[vcs](path1, revision_obj1, path2, revision_obj2, sidebyside)
KeyError: 'unknown' |
So I thought I’d try out version 0.15.0.5, which appears to be the latest. However I couldn’t find an up to date RPM for Fedora 14, I only found this one for Fedora 16.
Solution
I downloaded the Fedora 16 SRPM and rebuilt it for Fedora 14. I’m providing the RPMs on my yum repository for others that may need them.
The SRPM is available here.
References
NOTE: For further details regarding my one-liner blog posts, check out my one-liner style guide primer.
slmingol posted this in tips & tricks on March 15th, 2012, @ 8:59 am
Background
I recently wanted to download a podcast that was being served via a RTMP stream. RTMP (Real Time Messaging Protocol) was initially a proprietary protocol developed by Macromedia for streaming audio, video and data over the Internet, between a Flash player and a server. Macromedia is now owned by Adobe, which has released the specification of the protocol for public use.
Here’s how I was able to download the RTMP stream to a .flv file and convert it to a .mp3 file. Read on for the details.
Solution
step #1 – download the stream
I used the tool rtmpdump to accomplish this. Like so:
NOTE: the tool rtmpdump was available in my Distro’s repository
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| # I was able to get the rtmp url from looking at the page's source!
% rtmpdump -r rtmp://url/to/some/file.mp3 -o /path/to/file.flv
RTMPDump v2.3
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
INFO: Connected...
Starting download at: 0.000 kB
28358.553 kB / 3561.61 sec
Download complete |
step #2 – convert the flv file to mp3
OK, so now you’ve got a local copy of the stream, file.flv. You can use ffmpeg to interrogate the file further and also to extract just the audio portion.
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| % ffmpeg -i file.flv
....
[flv @ 0x25f6670]max_analyze_duration reached
[flv @ 0x25f6670]Estimating duration from bitrate, this may be inaccurate
Input #0, flv, from 'file.flv':
Duration: 00:59:21.61, start: 0.000000, bitrate: 64 kb/s
Stream #0.0: Audio: mp3, 44100 Hz, 1 channels, s16, 64 kb/s |
From the above output we can see that the file.flv contains a single stream, just audio, and it’s in mp3 format, and it’s a single channel. To extract it to a proper mp3 file you can use ffmpeg again:
…. Continue reading → [one-liner]: Download an RTMP Stream & Convert it to an MP3 File via the Fedora/CentOS Command Line »»
slmingol posted this in package management on March 12th, 2012, @ 7:40 am
Background
I just came across this nifty little tool called yum-builddep, which is part of the yum-utils package. It can be a really big time saver if you need to build source RPMS (SRPMs). What does it do? yum-builddep, installs all the RPM dependencies required to build a given SRPM.
Solution
Installation is a snap, it’s just part of the yum-utils package on Fedora & CentOS.
Once installed you can use it like so:
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| # on my Fedora 14 system
% yum-builddep sox
...
Dependencies Resolved
===========================================================================================
Package Arch Version Repository Size
===========================================================================================
Installing:
flac-devel x86_64 1.2.1-6.fc12 fedora 605 k
gsm-devel x86_64 1.0.13-2.fc12 fedora 13 k
ladspa-devel x86_64 1.13-6.fc12 fedora 18 k
libao-devel x86_64 1.0.0-2.fc14 updates 33 k
libid3tag-devel x86_64 0.15.1b-10.fc13 fedora 9.3 k
libsamplerate-devel x86_64 0.1.7-2.fc12 fedora 8.3 k
libsndfile-devel x86_64 1.0.25-1.fc14 updates 140 k
libtool-ltdl-devel x86_64 2.2.10-3.fc14 fedora 166 k
pulseaudio-libs-devel x86_64 0.9.21-7.fc14 updates 302 k
wavpack-devel x86_64 4.60.1-1.fc14 updates 50 k
Installing for dependencies:
ladspa x86_64 1.13-6.fc12 fedora 34 k
pulseaudio-libs-zeroconf x86_64 0.9.21-7.fc14 updates 26 k
Transaction Summary
===========================================================================================
Install 12 Package(s)
Total download size: 1.4 M
Installed size: 8.6 M
Is this ok [y/N]: |
Notice it’s determining what libraries and other RPMs are required to BUILD sox from source, not just what is needed to install sox. Here’s another example, probably more consistent with how most people will end up using yum-builddep, where you’ll use it as an aid in rebuilding a SRPM package.
…. Continue reading → [one-liner]: Using yum-builddep to Speed Up the Building of SRPMs on Fedora & CentOS »»
slmingol posted this in tips & tricks on March 7th, 2012, @ 8:50 am
Background
Never heard of this app before, easyLife, but it purports to simplifying the installation of the extras that you typically will need on your Fedora system, (i.e. Java, Nvidia, Skype, Adobe Flash, Fonts, etc.). It works like other apps have in the past, Automatix & Ultamatix, on Ubuntu, and Fedora Frog just to name a few.
Solution
easyLife provides an easy installation method for the following 3rd party software on Fedora:
- Sets “sudo” command up for your regular user;
- Configures RPMFusion repository for extra and non-free software;
- Installs Flash Player plugin;
- Installs all kinds of Codecs (h264,divx,xvid,mp3 etc);
- Installs nvidia and ati drivers;
- Installs Skype;
- Installs Sun Java and Sun Java Plugin for Firefox;
- Integrates Sun Java with system-switch-java;
- And many others…
Installation is dead simple.
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| # download the latest version
% curl -L 'http://sourceforge.net/projects/easylife-linux/files/latest/download?source=files' 2> /dev/null > easylife_latest.rpm
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 59384 100 59384 0 0 41328 0 0:00:01 0:00:01 --:--:-- 80575
# install the rpm
% su -c "rpm -Uvh easylife_latest.rpm" |
And here’s what easyLife looks like once you fire it up.
 easyLife Main Window References
NOTE: For further details regarding my one-liner blog posts, check out my one-liner style guide primer.
slmingol posted this in tutorials on March 5th, 2012, @ 9:01 am
Getting Started
A while back I setup a 1TB hard drive for backing up my primary file server. That 1TB drive was setup in a software RAID, a RAID 1 mirror to be exact. However I opted at the time to only add the one drive to the RAID, mainly because I only had just the one. Well I finally got around to getting a 2nd 1TB drive and needed to add it as another member of the RAID. These are the steps that I used to accomplish it.
Preexisting RAID
Now before we get started here’s what the RAID setup looks like. NOTE: Throughout this article I’ll be making use of the command mdadm. This command is the primary tool for managing a software RAID under Linux. Also notice that my RAID is identified by /dev/md0. Typically the software RAIDs are identified as /dev/mdX, where X is a number.
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| # Existing RAID setup
% mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Wed Dec 16 22:55:51 2009
Raid Level : raid1
Array Size : 976759936 (931.51 GiB 1000.20 GB)
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Raid Devices : 1
Total Devices : 1
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Sun Feb 19 04:22:02 2012
State : clean
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
UUID : 1f1b36fd:ce3d589e:6a89fc71:2e8f3e64
Events : 0.222
Number Major Minor RaidDevice State
0 8 33 0 active sync /dev/sdc1 |
Nothing amazing here. We have 1 device, the RAID is clean and the RAID device is /dev/sdc1.
Installing the 2nd HDD (Hard Disk Drive)
The next step was to power down the system, install the 2nd HDD, and reboot. Once the system detected the new drive I confirmed that it was detected cleanly by the Linux kernel.
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| # visually inspect the dmesg log
% dmesg
...
...
### drive #1 (existing HDD)
ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata5.00: ATA-8: Hitachi HDS721010CLA332, JP4OA3MA, max UDMA/133
ata5.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 31/32)
ata5.00: configured for UDMA/133
...
...
### drive #2 (newly added HDD)
ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata6.00: ATA-8: Hitachi HDT721010SLA360, ST6OA31B, max UDMA/133
ata6.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 31/32)
ata6.00: configured for UDMA/133 |
Good so the hardware was detected by the kernel. Now let’s see if the kernel was able to assign a device handle to the newly installed HDD.
…. Continue reading → How to Add a New Hard Drive to a Linux Software RAID (CentOS & Fedora) »»
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May 14th, 2013, @ 5:31 pm |
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