Re: [Discuss] Ubuntu USB Drives appending _ to folder

[Nuno Sucena Almeida]

On 06/20/2012 09:52 AM, John Abreau wrote:
> Whenever this happens, the old directories will be on the root filesystem.
> I suppose your script could check for that.
> 
> mount | grep ' on /media/Nagios_Backup' | cut -d' ' -f3
> 
> will return the directory with the prefix "Nagios_Backup" that is actually
> in use as a mount point.

A few additions:
the command 'mountpoint -q' to check the mount mount might be useful
(On ubuntu 12.04 it's on the initscripts package). A lazy umount can
also help (umount -rl).
I would setup a fixed mount point, instead of relying on automount,
using the UUID= or LABEL= on the fstab, see the blkid command.
I have something like the following to backup the whole system to
another raid disk system. You can improve it by using rsnapshot instead.
Regards,
Nuno

fstab, change where needed:
UUID=put_here_the_blkid_uuid_for_the_usb_drive /backup/system ext4
noauto,relatime,errors=remount-ro0   2


simple script:
#!/usr/bin/env bash

BACKUP=/backup/system

function cleanup {
# lazy umount, remount read-only if fails
umount -rl ${BACKUP}
}

trap "cleanup" exit

echo "* begin $(date)"
mountpoint -q ${BACKUP} || mount ${BACKUP}
rsync -axhhS --stats / ${BACKUP}
rsync -axhhS --stats /boot/ ${BACKUP}/boot/
echo "* end $(date)"


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Re: [Discuss] Mentor Graphics

[Nuno Sucena Almeida]

On 06/21/2012 12:02 PM, Drew Van Zandt wrote:
> Does anyone on the list work for Mentor Graphics, or have a contact who
> does?  I'm interested in teaching a real PCB design tool at the Artisan's
> Asylum.

I have a friend that worked for Mentor Graphics for 3 years, but left a
year ago. I'll contact him and let you know if he's still in touch with
someone.
Cheers,
Nuno

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Re: [Discuss] No Wav or Video sound on Fedora 17

[Nuno Sucena Almeida]

On 07/04/2012 10:05 AM, Jerry Feldman wrote:
> I installed fedora 17 a while ago and I am not getting sound from
> YouTube, Movie Player (wav), or VLC.
> However I do get sound from some applications as well as from Google talk.
> 
> Googling for a fix has not achieved any results. It is
> 

Since it seems you are using pulseaudio, install pavucontrol and check
if you are sending the stream to the correct hardware output. Also see
if any of the outputs is muted.
Cheers,
Nuno


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Re: [Discuss] No Wav or Video sound on Fedora 17

[Nuno Sucena Almeida]

On 07/05/2012 07:18 AM, Jerry Feldman wrote:
> No outputs are muted. The earphones were shown at 100%. I removed the
> earphones to use internal speakers, and no output.

After you start vlc, do you see its stream within pavucontrol and does
the VU meter bounce when there's audio being played?
From the vlc Audio settings you can set the output module, which one do
you have? I can choose between default,alsa,pulseaudio,oss and others, I
have it currently set at "Default", but you can try pulseaudio to see if
it works for you.

Nuno

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Re: [Discuss] No Wav or Video sound on Fedora 17 Solved

[Nuno Sucena Almeida]

On 07/05/2012 07:52 PM, Jerry Feldman wrote:
> The issue was that the sound configuration was not set. Something stupid
> and simple. VLC worked fine when I manually set the output device.

Jerry,
That's great that you got it to work for you. I wasn't a fan of
pulseaudio either, but when I started using a usb headset for
voip(ekiga) and skype I realized how convenient it is to be able to
switch the individual application in/out stream to specific devices,
using a GUI configuration tool.
Unfortunately with so many configuration settings (application audio
in/out settings, stream volume, stream hardware output/input, hardware
volume, hardware mute, etc) it can be a bit daunting to understand how
everything works together, coming from the oss/alsa simpler world.
Cheers,
Nuno

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Re: [Discuss] Moving servers from NIS to LDAP

[Nuno Sucena Almeida]

On 07/11/2012 02:57 PM, Bill Bogstad wrote:
> That sounds like a lot of extra latency for looking up simple things
> (i.e UID -> username mappings i.e. "ls -l").  I don't know if local
> caching is included the standard LDAP/NSS setup, but I would check
> myself to be sure.
> 
> Good Luck,
> Bill Bogstad

You can setup a local ldap slave replication server, which would also be
convenient if the external network goes down. For the migration, a
mapping file and script to update uids/guids would probably work just fine.
Cheers,
Nuno

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Re: [Discuss] hosts.equiv

[Nuno Sucena Almeida]

On 09/14/2012 09:51 AM, Dan Ritter wrote:

When you run rsync, pass it "-e ssh -i/home/jdm/.ssh/rsync.key"


Or setup your .ssh/config with something like:

Host remotehostnickname
HostName remotehostname
User remoteusername
IdentityFile ~/.ssh/rsync_id_rsa

Nuno

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Re: [Discuss] [Slightly OT] Streaming video services?

[Nuno Sucena Almeida]

On Thu, Nov 29, 2012 at 12:15:06PM -0500, Shirley M?rquez D?lcey wrote:
> One downside of Amazon is that they don't support high definition
> streaming to PCs; only to the Kindle Fire and to supported media
> streaming boxes. And annoyingly, they don't support streaming to
> non-Kindle Android devices at all, though they offer it to the iPad

I have a HP TP running cyanogen (android 4.x) and can watch Amazon
prime with no problem at all.

Nuno

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Re: [Discuss] [Slightly OT] Streaming video services?

[Nuno Sucena Almeida]

On 11/30/2012 03:01 PM, Shirley Márquez Dúlcey wrote:

web version with Flash?


Yes, I'm using the web version.

Nuno

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Re: [Discuss] Returned to the NVIDIA fold

[Nuno Sucena Almeida]

On Wed, Jan 09, 2013 at 11:33:50PM -0800, Rich Braun wrote:
> electric power: I'm measuring 29 watts idle, 33 watts during TV playback.  If
> only one could make the Shuttle product work (with the D2700's internal GPU),

Did you check the nvidia settings for the GPU clock ? Usually you can
choose between 'adaptative' and 'maximum performance'. In your case,
the former might be more appropriate, since it will reduce GPU speed
and by consequence power consumption when not needed.

regards,
Nuno

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Re: [Discuss] Ripping Audio Cd then copying to Android

[Nuno Sucena Almeida]

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On 01/12/2013 11:08 AM, John Abreau wrote:
> I've always used Grip to rip my CDs to WAV files, mainly because it

Why use WAV when FLAC is lossless, open-format and takes less space?

cheers,
Nuno


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Re: [Discuss] Ripping Audio Cd then copying to Android

[Nuno Sucena Almeida]

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On 01/12/2013 02:05 PM, John Abreau wrote:
> Because FLAC is not the intermediate file format that Grip writes to during 
> the first phase of ripping a CD. Why does it matter that the temporary files 
> which I delete after transcoding to FLAC are not themselves FLAC files?

- From your post it seemed that you permanently stored the WAV files, to
later convert to flac,ogg,etc only when needed, not as a temporary file
format, hence the question.

Cheers,
Nuno

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Re: [Discuss] ftdi chipset and linux

[Nuno Sucena Almeida]

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On 01/17/2013 07:52 AM, Scott Ehrlich wrote:
> From a chipset compatibility standpoint, what do people know about
> ftdi and linux?   I know I could always visit the ftdi page, but
> anyone with practical knowledge here would be great.

I've seen ftdi devices being uses for make different projects and never
heard of drivers issues:

http://www.ftdichip.com/Drivers/VCP.htm
"All FTDI devices now supported in Ubuntu 11.10, kernel 3.0.0-19
Refer to TN-101 if you need a custom VCP VID/PID in Linux"

http://www.ftdichip.com/Drivers/D2XX.htm
http://www.ftdichip.com/Drivers/D2XX/Linux/ReadMe-linux.txt
"
FTDI do not release the source code for libftd2xx.  If you prefer to
work with source code and are starting a project from scratch, consider
using the open-source libFTDI.
"

http://www.intra2net.com/en/developer/libftdi/
"
libFTDI is an open source library to talk to FTDI chips: FT232BM,
FT245BM, FT2232C, FT2232D, FT245R and FT232H including the popular
bitbang mode. The library is linked with your program in userspace, no
kernel driver required.

libFTDI works perfectly with Linux, Windows, MacOS X and BSD variants
thanks to libusb.
"

regards,
Nuno

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Re: [Discuss] Suse sed question

[Nuno Sucena Almeida]

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On 08/28/2013 05:23 PM, David Kramer wrote:
> files as binary.  Its taking all the input files, which are in DOS format,
> and converting them to POSIX line endings, which is causing our source

Don't know about that particular case, but maybe you could use the
todos/fromdos tools instead?

regards,
Nuno

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Re: [Discuss] NVidia 2 screen problem

[Nuno Sucena Almeida]

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On 09/10/2013 10:40 PM, David Kramer wrote:
> - Switching desktops switched both screens, so if I was watching
> mythfrontend on the TV and wanted to switch to another desktop on my
> monitor, the TV would switch away from mythfrontend too.  In order to
> fix that, I then had to configure mythfrontend to run in a window
> slightly smaller than the screen so I could get window decorations so I
> could then tell it to appear on all desktops, but it looked like crap
> not being full screen, and it was a lot of work to set that up each time

I'm using twinview with 2 monitors and an nvidia card. Using the xfce4
window manager, and running vlc on the left monitor, I can set the vlc
window to 'always visible on workspace', which will make it visible in
all workspaces when I switch to them . I tried to put vlc in fullscreen
(pressing f) which will remove all decorations and it still worked, ie,
would move when switching workspaces.

> - When I would launch new windows on my monitor, they would often appear
> on the TV.  This is especially true of new Chrome windows.  The problem
> here is when I'm not watching mythfrontend. my TV is usually turned off,
> so I don't see those windows.  I could not find a way to tell the app or
> X to stay on the one screen.

You can make your desired monitor as the primary monitor using the
nvidia configuration tool. The other is to configure your window manager
to open new windows on the screen that has the mouse, which also works
for me. Just tried with chrome too...

regards,
Nuno

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Re: [Discuss] NVidia 2 screen problem

[Nuno Sucena Almeida]

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On 09/15/2013 08:48 AM, Nuno Sucena Almeida wrote:
> all workspaces when I switch to them . I tried to put vlc in fullscreen
> (pressing f) which will remove all decorations and it still worked, ie,
> would move when switching workspaces.

f works with vlc, since it's an internal shortcut, but alt-f11 (from
xfce4) works with any application.

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Re: [Discuss] ssd's in linux

[Nuno Sucena Almeida]

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On 11/08/2013 06:15 AM, Stephen Adler wrote:
> I'm thinking of upgrading my linux system by adding an SSD drive to use
> as my system disk. Has anyone done this? Any pros and cons regarings
> using SSD's? I'm more intrested in the cons. I'm worried about the life

I've been using a SSD for operating system and a HDD for /home for about
a year on a desktop computer. Running latest linux distribution and
didn't run into any issues (yet). The speed improvements are amazing. I
make regular backups of /home , reinstalling the o.s. is not a big deal
if the SSD fails for any reason.

I mount my / with
ext4relatime,discard,errors=remount-ro

hdparm reports it as:
Model=M4-CT128M4SSD2

regards,
Nuno

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Re: [Discuss] ssd's in linux

[Nuno Sucena Almeida]

-BEGIN PGP SIGNED MESSAGE-
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On 11/08/2013 07:51 AM, Nuno Sucena Almeida wrote:
> a year on a desktop computer. Running latest linux distribution
> and didn't run into any issues (yet). The speed improvements are
> amazing. I

forgot to mention. I don't have any disk swap.

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Re: [Discuss] Mail loop advice?

[Nuno Sucena Almeida]

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On 11/13/2013 08:08 AM, Daniel Barrett wrote:
> Limitations: I don't have root access to my (shared) server: it's a
> cpanel-based account. My ISP is not willing to change its global email
> setup (say, to autodelete all email matching a pattern I provide) for
> fear of impacting its other customers.
> 

Probably it's overkill: get a host somewhere, say your home if your ISP
doesn't block port 25 (or something like EC2 , linode, prgmr, etc),
setup a minimal email system there with no message size limitations and
configure your DNS to point your domain and MX over there.

regards,
Nuno

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Re: [Discuss] Hello. and AMD loan?

[Nuno Sucena Almeida]

On 01/12/2014 11:54 AM, Stuart Conner wrote:
> I'm getting tired of "distribution
> upgrades" breaking things.

If you stick with debian stable / ubuntu LTS , it shouldn't break things
when you upgrade. arch/gentoo on the other hand, with continuous
updates, I don't recommend those if you want stability.

regards,
Nuno

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Re: [Discuss] Time Daemons

[Nuno Sucena Almeida]

On 01/12/2014 01:18 PM, jbk wrote:
> So I've noticed on my latest install of Fedora 20 that it uses 'chrony'
> for time synchronization. Is there any need to use NTP?

>From http://chrony.tuxfamily.org/introduction.html it seems its major
feature is that it deals better with intermittent connections to
upstream ntp servers.

cheers,
Nuno

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Re: [Discuss] first time build of GIT server

[Nuno Sucena Almeida]

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On 01/30/2014 11:23 AM, John Malloy wrote:
> What site should I use for the  git clone   ?

I think that if you are asking these kind of questions, a
more thorough reading about git is in need, unless you want to have
frustrated developers/users down the line.

I recommend the Pro Git book , available online , ebook
and print at:

http://git-scm.com/book

For hosting, I also recommend gitlab, already mentioned
by someone else in this thread:

http://gitlab.org/

For my personal projects/docs/etc I've been using
gitolite + gitweb for a few years, having migrated from
svn and before that cvs. It's fairly straightforward to
setup, but even the gitlab guys moved away from it.
I'll eventually move to gitlab when I have the time.

cheers,
Nuno

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Re: [Discuss] Discuss Digest, Vol 32, Issue 36

[Nuno Sucena Almeida]

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On 01/31/2014 12:26 PM, Stuart Conner wrote:
> If you're handy, You could try to recover by transplanting the platters
> into a similar HDD chassis and reading an image with a tool like dd.
> This is what the pros do usually.

You probably want to do that in a clean room and copy the EEPROM
calibration information though. Even if you go that way, you might also
want to use something like https://www.gnu.org/software/ddrescue/ . I
remember there was a conversation thread about this in the past...

cheers,
Nuno

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Re: [Discuss] bluetooth epilogue

[Nuno Sucena Almeida]

On 02/17/2014 12:36 PM, Stephen Adler wrote:
> I hope this info is of use to the blu community... :)
> 
> Cheers. Steve.

I got the bluetooth adapter in the link below a few months ago and have
been running it on linux with no issues. The audio quality is also very
good, but I'm no audiophile. It has two modes, one where the mic is
activated and the other for hi-fi listening, which can be set using
pavucontrol for example. The range depends on the quality of the antenna
of the bluetooth adapter on your desktop/laptop.

regards,
Nuno

http://dx.com/p/s1-bluetooth-v3-0-stereo-audio-receiver-239067


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Re: [Discuss] network issue

[Nuno Sucena Almeida]

I'll add a few things:

- if using mixed gigabit/megabit switches or network cards, make sure
the ethernet cable is in good condition and that the computer/switch is
able to negotiate the speed. I've seen issues with this in the past, use
the already mentioned ethtool and look for out of place values and link
status.

- if it's a cheap router/switch, some models share two ethernet jacks
between the wan and lan for the same port: when the wan port is
connected, the lan or even both jacks won't work anymore. Testing that
same port and cable with another computer and knowing the router/switch
model would be helpful.

- also mentioned, use 'tcpdump -n -A -XX -i eth0' to look for bootpc
requests.

regards,
Nuno


On 03/14/2014 09:24 AM, Kevin D. Clark wrote:
> 
> [dhcp problems]
> 
> How about typing:
> 
>   date
>  
>   ifconfig eth0
> 
>   sudo ethtool eth0
>   (or perhaps "sudo mii-tool eth0")
> 
>   ethtool -i eth0
> 
>   ps -elf | grep dhcp
> 
>   sudo tcpdump -v -i eth0 \
>   'arp or icmp or udp port 67 or udp port 68' \
>   >/tmp/capture.txt &
> 
>   ifdown eth0
> 
>   ifup eth0
> 
>   ifconfig
> 
>   ps -elf | grep dhcp
> 
>   ls -l /etc/resolv.conf
> 
>   cat /etc/resolv.conf
> 
>   sudo ping -b 255.255.255.255
> (press control-c after ~5 seconds...)
> 
>   ping www.google.com
> 
>   fg
> 
>   cat /tmp/capture.txt
> 
> 
> Regards,
> 
> --kevin
> 


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Re: [Discuss] Quick question regarding Linux interpreter.

[Nuno Sucena Almeida]

On 03/27/2014 02:08 PM, Jerry Feldman wrote:
> I have a number of Python scripts that need Python 2.6.2 on RHEL 5. So,
> I point the script to a version of Python I have installed on our

I thought that virtualenv was supposed to address these dependencies issues?

http://www.virtualenv.org/en/latest/

regards,
Nuno

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Re: [Discuss] Linux file systems

[Nuno Sucena Almeida]

On 03/28/2014 07:16 AM, Jerry Feldman wrote:
> I'm a fan of btree file systems going back to the 1970s. IBM used it on
> their mainframes (VSAM) back then.

It seems that btrfs is now good enough for a famous social platform:

http://beta.slashdot.org/story/199975

regards,
Nuno

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Re: [Discuss] Upgraded to Ubuntu 14.04...can't connect to wifi with rtl8723ae driver

[Nuno Sucena Almeida]

On 04/26/2014 05:27 PM, Randy Cole wrote:
> Anybody got any ideas?

Increasing the module logging level (if possible) and showing the kernel
log messages (e.g. dmesg) would be helpful.

cheers,
Nuno

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Re: [Discuss] Yahoo and Exim4 configuraiton

[Nuno Sucena Almeida]

On 05/16/2014 11:53 AM, Richard Pieri wrote:
> Not a misconfiguration per se. exim4's TLS key exchange wants at least
> 1024 bits of prime number by default but Yahoo is using fewer bits than
> that. You can change this in your local exim4 config with the
> TLS_DH_MIN_BITS setting (a value of 512 should work for Yahoo).

Unfortunately it's not only yahoo, a few (ton?) of other providers have
the same issue, since I ran into this same problem some time ago. Add to
that the crappy cryptos that yahoo, google et al fall back to, it almost
seems that the email encryption is just for show...

Nuno

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Re: [Discuss] Qemu PPC with Virt-Manager

[Nuno Sucena Almeida]

On 06/23/2014 08:20 AM, Anthony Gabrielson wrote:
> Error: Cirrus VGA not available 

Don't if it helps, but you can try to run with another graphics card
emulation ?

qemu -vga std

(and others, see qemu man page)

regards,
Nuno
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Re: [Discuss] vnc

[Nuno Sucena Almeida]

On 08/24/2014 01:09 PM, Richard Pieri wrote:
> Right tool for the job and all that.
> 
> That said, I'd avoid using OpenVPN. I don't like X.509. I want X.509 to
> die in a fire. I want it to die painfully and permanently and never
> bother anyone ever again. For Linux to Linux I'd use Layer 3 tunneling
> over SSH using sshuttle to handle the heavy lifting.

I use sshuttle for a very particular situation, but the way it works,
with a few hacks, looks much less cleaner than OpenVPN. I've been using
OpenVPN for many years without trouble, either at Layer 2 or Layer 3,
and the network configuration is much more clear than the magic that
sshuttle does. Why the dislike of X.509 ?

Coming back to the topic, if not using XDMCP, one can use x11vnc to
direct to the login screen, by passing the auth parameter, something
like this:

sudo x11vnc -ncache 10 -auth /var/run/lightdm/root/:0

The auth parameter argument can be found by looking at the running X:

ps ax | fgrep -- -auth

regards,
Nuno

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[Discuss] Debian Commercial Support ?

[Nuno Sucena Almeida]

Hi,
which company do you recommend that would provide support for Debian ?
This is to be used in (single/dual) server (x86_64), development
desktops (x86_64) and product embedded systems (x86 / x86_64 / ARM) for
a multi-national (my employer) with HQ in the US.
The only thing I seem to find is the
 webpage.
We have preference for debian based systems and are considering a few
distributions (ubuntu,rhel,suse,wind river,etc), but would need some
kind of guaranteed and lasting commercial support.

thank you!,
Nuno

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Re: [Discuss] nginx reporting

[Nuno Sucena Almeida]

On 10/26/2014 02:54 PM, Robert La Ferla wrote:
> What’s an easy to setup reporting tool for nginx that shows page views, 
> errors, where users are coming from, browser version, etc… ?
> 
> Thanks,
> Robert

Hi,
depending what you need, awstats might do.

http://www.awstats.org/

regards,
Nuno

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Re: [Discuss] Linux project - WX

[Nuno Sucena Almeida]

On 02/10/2015 02:10 AM, Rich Braun wrote:
> aviation software. But it actually comes from the days of telegraph machines:
> in Morse code it is .-- -..-

-. .. -.-. .  --- .-- - --- , thank you!

As you mention, weather stations hardware is still a bit on the
expensive side, so for now I make do with temperature+humidity DHT22 and
the barometric pressure sensor BMP180.

cheers,
Nuno

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Re: [Discuss] pulse files in /tmp on RHEL 6

[Nuno Sucena Almeida]

On 03/11/2015 03:18 PM, John Abreau wrote:
> find /tmp -type d -name pulse\* -newer foo -print0 | xargs -0 rm -rf

find bla -exec command {} +;

find bla -delete

Nuno

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Re: [Discuss] Mythbuntu on VMWare slow

[Nuno Sucena Almeida]

On 03/20/2015 07:14 AM, Edward Ned Harvey (blu) wrote:
> Did you go into BIOS and enable the virtualization tech, such as vt-x, and 
> vt-d? 

Suggest to also start from here, from what I've seen, most computers
come with these settings disabled.

Nuno

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Re: [Discuss] RTOS- Real Time Operating System in Automotive such as QNX Neutrino and VxWorks®

[Nuno Sucena Almeida]

On 04/19/2015 03:18 PM, sikou jackson wrote:
> QNX Neutrino

For QNX 6.6.0 you can register for a 30-day trial and download BSPs for
your hardware. The documentation is also available online.

Trial:
http://www.qnx.com/products/evaluation/

BSPs:
http://community.qnx.com/sf/sfmain/do/viewProject/projects.bsp

Documentation:
http://www.qnx.com/developers/docs/660/index.jsp

regards,
Nuno

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Re: [Discuss] all Debian package source files browsable online

[Nuno Sucena Almeida]

On 04/26/2015 12:41 PM, Tom Metro wrote:
> full source code can be browsed
> online

great to know!

Nuno

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Re: Google topper: Linux robotics

[Nuno Sucena Almeida]

On Saturday, February 12, 2011 09:44:09 am Mark Woodward wrote:
> This morning, I googled for "linux robotics" and my site,
> www.linuxpcrobot.org was at the top of the results. Now, I do have an
> amount of pride in it, for what its worth, but come on now, you'd think
> Amazon or IBM would be ranked higher.
> 
> Anyway. Cool.

I missed your presentation, but your website looks very good. When do 
you plan to put the video online? 
Thanks,
Nuno
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Re: Ubuntu CPU scaling ignoring me more than my daughter does

[Nuno Sucena Almeida]

On Sunday, March 06, 2011 11:42:58 PM David Kramer wrote:
> What else can I try?

As a temporary measure you can try to disable power saving from the computer 
BIOS ?
I did a quick search and found the following bug


and from comment #12 onwards:


"
To see if you have the same problem, do a:
$ cat /sys/devices/system/cpu/cpu0/cpufreq/bios_limit
In my case, anything less than 240 means the workaround is necessary. To 
implement it, just add "processor.ignore_ppc=1" to the 
GRUB_CMDLINE_LINUX_DEFAULT paramenter in /etc/default/grub, and then run:
$ sudo update-grub
Reboot.
"

regards,
Nuno

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Re: Android Tablet

[Nuno Sucena Almeida]

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On 04/06/2011 12:41 PM, Hsuan-Yeh Chang wrote:
> Do you think this may be a feasible idea?  Thanks!

If you want to try something like that, go to http://boot.kernel.org/ .

You can also test it by using qemu to run the dsk in a VM

regards,
Nuno

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Re: ubuntu 11.04 problems

[Nuno Sucena Almeida]

On 05/05/2011 11:12 AM, dan moylan wrote:
> as root i did an adduser mem (wife) and rebooted.  again
> trying moylan, i was returned to the loging screen.  trying
> mem, it went off into never never land.  rebooted and went
> back in as root, all ok.

Is your home partition full or do you have quotas set up and it's
full/grace period expired? Sometimes that can be the reason for these
"strange" errors, as you can't write to the disk. One other thing to
check is if the uid/guid are correct.

btw, hi neighbor, I'm on 35 :)

Nuno

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Re: [Discuss] To catch a thief

[Nuno Sucena Almeida]

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On 07/28/2011 07:48 AM, Doug wrote:
> Has anyone setup a motion detection
> camera for the home?

I don't recommend honey pot, but you can try the 'motion' webcam
application.

It has motion detection, save to image/video, upload to remote server
and other goodies. It works fairly well. Debian/ubuntu comes with it
(apt-get install motion)

http://motion.sourceforge.net/

regards,
Nuno
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Re: [Discuss] sed and ANSI sequences

[Nuno Sucena Almeida]

On Thu, Oct 13, 2011 at 03:00:04PM -0400, David Kramer wrote:
| PS: I did see one working example at
| 
http://travelingfrontiers.wordpress.com/2010/08/22/how-to-add-colors-to-linux-command-line-output/
| sed ''/crit/s//$(printf "\033[31mCRITICAL\033[0m")/g''
| 
| However, it relies on the printf command, which means (1)launching another 
process and 2) not
| using sed's buffers, so I can't have a series of sed operations in one 
command.

I use something similar to this, also running an external command (echo). 
Here's an example, using the -e
sed command argument

function getinfo()
{
DEV="$1"
WHAT="$2"
REGEXP="s,.*${WHAT}:\([0-9.]\+\).*,\1,p"
ifconfig ${DEV} | sed -n -e "$(echo ${REGEXP})"
}

AFAIR I went through the same issues and apparently you cannot directly pass
variables to sed. If you feel thank you can do the same with (g)awk
instead, you can pass variables to it.
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Re: [Discuss] Virtual hosting provider

[Nuno Sucena Almeida]

On 10/27/2011 12:43 PM, Dave Peters wrote:
> Any suggestion for virtual hosting server provider? blueHost? Hostmonster, 
> Godaddy, inmotion or networksolutions?

I've been using http://prgmr.com/xen/ for about a year and have been
happy with it. It's a small operation, the owner is the author of "The
Book of Xen" and it's in CA. At some point I think they were co-lo at
he.net, but I'm not sure that's still the case.
Nuno

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Re: [Discuss] OT: what is this cable for?

[Nuno Sucena Almeida]

On 11/01/2011 09:27 PM, Dan Kressin wrote:
> Anybody recognize this cable configuration?  Male DB15 (two rows - 8/7) to 
> 50pin Centronics.  Ribbon cable w/ two (the name escapes me ..) "ring things" 
> to usually used to fight inductance..  The only DB15 connectors I'm familiar 
> with are for old Mac monitors, PC joysticks, and.. well I guess that's it.  
> Serial would have been 9 or 25..



Seems to be a Nortel Nortel Network Cable - 50 Pin Mini-Centronics (M) -
DB-15 (M)

Nuno

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Re: [Discuss] 4-Bay NAS

[Nuno Sucena Almeida]

On 02/02/2012 08:38 PM, Richard Pieri wrote:
> I'm shortly going to be in the market for a 4-bay NAS box for my home storage.

I got a intel ss4200-e a few years ago and I'm happy with it, it has 4
sata bays, gigabit ethernet, many usb ports, serial console, eSata and a
IDE for a booting device. I installed ubuntu 11.10 server edition and it
runs quite fast and quiet, although I have it most of the time in sleep
mode to save energy, waking daily up with a bios clock (RTC) interrupt
to rsync/rsnapshot or Wake-On-LAN (WOL) when I need to access it from
other computers.



It's out of production and the current price is a bit steep but if you
can find a cheap used one I can recommend it.
I wouldn't buy it for more that $150 since nowadays you can build a
better and more powerful machine for less, as Mark recommended.

regards,
Nuno

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Re: [Discuss] Raspberry Pi launch imminent

[Nuno Sucena Almeida]

On 02/27/2012 12:07 PM, Kurt Keville wrote:
> sold out in a day if their servers can handle it

I think it will be sold out in an hour, with the same caveat :) $25/$35
for a linux computer with gpio , usb , ethernet , video output and other
goodies is too good to let it pass.
The partially closed firmware is a slight issue, but nobody really owns
the firmware/microcode of their other gadgets/chips anyway.
As long I can run gcc and poke at the hardware the rasperry seems to be
a nice contender to other HW platforms.

Nuno

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Re: [Discuss] web file download

[Nuno Sucena Almeida]

On 02/28/2012 07:09 PM, Stephen Adler wrote:
> under the surface

Just a quick suggestion, that can be used for any protocol, is for you
to use tcpdump to capture the traffic from another application and then
use wireshark to analyze it.
It comes with many high-level protocol analysis, including handshaking,
etc. It's fairly trivial to capture and analyze http traffic that way.
You can also check the http RFC.

Cheers,
Nuno

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Re: [Discuss] text-screen login?

[Nuno Sucena Almeida]

On 04/18/2012 10:30 AM, R. Luoma wrote:
> For some for the recent distros (e.g. ubuntu)
> I am having difficulty figuring out how to kill
> the GUI login and have the old-fashion
> text-terminal-like login screen.
> 
> Does anyone have helpful advice
> on how to set up a freshly installed
> linux-based system to start with
> a text-screen login
> 
> Thanks,

Quick googling:
http://www.techienote.com/2012/01/disable-gui-boot-in-ubuntu-11-10.html

Basically you need to use update-rc.d to remove the 'lightdm' (for new
ubuntu distributions) graphical login links from the system startup.
All the rest from that tutorial is to disable the ubuntu graphical
splash at boot.
Which distribution are you using, do you know which gui login interface
is installed?

Nuno
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Re: [Discuss] [kind of off topic] noise canceling headphones

[Nuno Sucena Almeida]

On 10/30/2015 11:31 AM, Rich Pieri wrote:
> Beyerdynamic DT770 Pro, KRK KNS-8400, and Brainwavz HM5 with Shure
> SRH1540 earpads

Hi Rich, how would you compare these 3 ? Right now my solution to block
human speech at work is to have in-ear earmuffs + bose qc15. I also
tried Peltor h10 and they seem to work better blocking general noise and
voice, but after a few hours they start being uncomfortable.

thanks,
Nuno

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Re: [Discuss] Experiences virtualizing: Linux hosted in Windows vs Windows hosted in Linux

[Nuno Sucena Almeida]

On 11/13/2015 07:10 PM, John Abreau wrote:
> When I do need to run Windows, its performance in a VM is abysmal, so I
> stick with dual-booting for performance reasons.

I run linux guest on linux host and sometimes windows guest on linux
host and don't see much performance difference, I usually assign 8GB RAM
for desktop guests. Make sure you have (intel) VT-x and optionally VT-d
enabled on your bios. I use both linux kvm (qemu) and virtualbox. More
of the former for servers and the latter for desktops.

Nuno

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Re: [Discuss] Experiences virtualizing: Linux hosted in Windows vs Windows hosted in Linux

[Nuno Sucena Almeida]

On 11/14/2015 03:17 AM, John Abreau wrote:
> My laptop's BIOS doesn't provide any hardware virtualization options.

If that's the case, it probably doesn't have hardware virtualization
support and would explain the performance issues. There's a few ways you
can check for their availability...What CPU does it have ? What year is
the model. Check the output of /proc/cpuinfo, kvm-ok, etc.

regards,
Nuno

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Re: [Discuss] Delivering mail to folders

[Nuno Sucena Almeida]

On 01/31/2016 04:35 PM, David Kramer wrote:
> like Dovecot wasn't showing my "inbox" from /var/mail/

I would recommend you to use Maildir instead of mbox and dovecot + sieve
as LDA.

regards,
Nuno

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[Discuss] blu dns misconfiguration ?

[Nuno Sucena Almeida]

Hi,

it seems there's some DNS misconfiguration on a BLU server:

~$ host 216.235.254.231
231.254.235.216.in-addr.arpa domain name pointer minerva.blu.org.

~$ host minerva.blu.org
Host minerva.blu.org not found: 3(NXDOMAIN)

This is the hostname being used for mailing list SMTP deliveries.

regards,
Nuno

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Re: [Discuss] blu dns misconfiguration ?

[Nuno Sucena Almeida]

On 03/26/2016 09:29 AM, Jerry Feldman wrote:
> minerva was an old host that was replaced. The PTR still has that. I
> thought that JABR added a minerva cname

John,

could you take a look at this (add cname) or change the smtp delivery
hostname ? In the current state it gets blu emails refused if the smtp
mta checks for reverse dns.

thanks,
Nuno

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Re: [Discuss] blu dns misconfiguration ?

[Nuno Sucena Almeida]

On 03/29/2016 02:24 AM, John Abreau wrote:
> I added the CNAME several days ago. It should have propagated globally
> by now.

Hi, it's working now, thanks,

Nuno

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Re: [Discuss] Simplest HTML hosting for a 9-year-old engineer?

[Nuno Sucena Almeida]

On 04/10/2016 01:53 PM, Daniel Barrett wrote:
> I also have a separate shared hosting account with ~20 of my domains,
> but if I gave him a SFTP login there, he'd have write access to all of
> my files, not just his own little web site.

You can create a chrooted sftp account that only has access to its own
web corner. Also, use ssh keys to keep it more secure, not passwords.

regards,
Nuno

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