Suares & Co Open Source Solutions
Suares & Co Open Source Solutions
Suares & Co Open Source Solutions
Minister Adriaens ontvangt de Eerste Curacao Open DVD tijdens Software Freedom Day 2009
(foto: Max Martina) Op 19 sept 2009 werd Software Freedom Day voor het eerst op Curacao gevierd.
Suares & Co: De open source expert van Curaçao
en de Antillen.
- GNU/Linux (Ubuntu, CentOS, Red Hat)
- Web services (websites, webdevelopment, webdesign)
- Email services (zelf beheren van emailadressen)
- Mailinglijsten (publiceer of discusieer)
- Database driven websites (content management)
- Content Management Systeem 'QwikZite'
- Goedkope oplossingen voor non-profits en scholen
- Terminal Servers (LTSP, hergebruik oude hardware, Win4Lin)
- Firewalls (Gibraltar, Untangle)
- Webapplicaties in PHP en Ruby on Rails
- Cursus Linux & Cursus Programmeren
- Office Pakket 'OpenOffice.org'
Vanaf 2002 aktief in de Nederlandse Antillen (Curacao, Bonaire).
Suares & Co levert de service voor 725 domeinnamen, 30 statische websites, meer dan 200 database driven websites (incl. QwikZites), 70 mailinglijsten (samen meer dan 10.000 unieke abonnees) en ruim 1100 email-gebruikers (281 unieke email-domeinen), in de Antillen en in Nederland.
Suares & Co werkt samen met Kuki & Ko in Curaçao en met Jan Veuger Internetdiensten in Nederland.
Kunnen wij ook iets voor U doen !? Neem dan via e-mail contact met ons op, of bel +5999 678 00 60.
- Ace Suares speelde een rol in de door de Curacao Tourist Board in de VS getoonde commercial: 'Letters' op YouTube
- Suares & Co beheert de website voor Open Curacao: OpenCuracao.com
- Download verslag enquête Open Source Seminar 2008 hier!
- Moodle Hosting voor E-learning? Klik hier
- Ons cursusaanbod vindt u hier
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Zentyal/Ebox, slowness, and WDxxEARS Advanced Format
10-02-2011- Zentyal (formerly named Ebox) is an Ubuntu based Small business server that is easy to configure and in my opnion a real breakthrough in Ubuntu-based small business servers. Unfortunately, I had a bit of bad luck (or lack of information) when I installed my first two servers for clients on Curaçao. The server was very, very slow, up to the point where a simple ssh login took 2 minutes and in one case the install halted halfway. I spent many hours trying to troubleshoot the problem and meanwhile I had to revert to webmin or some other solution.
- The problems are described in the following posts on the Zimbra forum:
http://forum.zentyal.org/index.php?topic=3697.0
http://forum.zentyal.org/index.php?topic=4212.0
http://forum.zentyal.org/index.php?topic=3968.0
http://forum.zentyal.org/index.php?topic=3427.0
http://forum.zentyal.org/index.php?topic=4273.0
and most notably
http://forum.zentyal.org/index.php?topic=5724.0 - Unfortunately, the forums didn't help much. After many days of frustration, I decided to buy support, which cost 390 EUR. I've never paid for support before in my life and I hope I don't have to do it again. Although the team at Zentyal did their best to help me, they didn't really succeed. Finally, after swapping out all hardware except the harddisks, I bought a new harddisk, although there where no harddisk errors reported and SMART status was okay.
- Then it hit me like a brick. I typed in the model number of my Western Digital Caviar Green WD10EARS and what do you think - hundreds of posts about how this harddisk uses Advanced Format and how that gives loads of problems. Google for yourself: any WD of the EARS series has this problem. My new disks where of the EADS series and after copying all the data (which took ages) and reinstalling the server, the server was flying! Normal load, normal speed, everything was fine.
- The problem lies in the alignment of sectors on the EARS drive. More information on the Advanced Format can be found here and here.
- After I repartitioned the EARS drives by hand, I installed a new server with these disks, and the server was as fast as it should be. Wrong alignment of the EARS drives really really slows all disk I/O down.
- Newer versions of parted should detect AF automatically and so I hope the Zentyal team will put the newer version of parted into their installer. Also, when giving support, a simple
hdparm -i /dev/sd?|grep EARS
would make the problem clear right away. A pity that the team at Zentyal didn't know that and I hope this information will be integrated in their knowledgebase. - All in all, I find Zentyal a great product that really fills a niche in the small business server market. I am happy with the server now that the slowness problems have been solved.
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Ebox 1.4 and HP Color LaserJet 2600N
01-09-2010- Follow instructions here: ubuntuforums.org, except the last step.
$ wget -O foo2zjs.tar.gz http://foo2zjs.rkkda.com/foo2zjs.tar.gz
$ tar zxf foo2zjs.tar.gz
$ cd foo2zjs
$ make
$ ./getweb 2600n # Get HP LaserJet 2600n .ICM files
$ sudo make install
$ sudo make cups
Now go to Ebox -> Printer Sharing -> Add Printer
And go find the HP -> Color Laserjet 2600N. It will now have a driver (foo2hp). The next page you can select stuff:
"Color Mode" = Color
"Bits Per Plane" = 2
"ICM Color Profile" = (something like hpclj2600n-0.icm)
- Follow instructions here: ubuntuforums.org, except the last step.
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Firefox on LTSP as Local Apps (Thin Client, Ubuntu)
20-07-2009
Firefox as Local App on Ubuntu Jaunty 9.04
LTSP: The possibility of running Local Apps on the Thin Client is part of Ubuntu since Jaunty (9.04). The most obvious choice is to run Firefox (inlcuding Adobe Flash) locally. As you might have experienced video (f.e. on YouTube or Vimeo) can be very slow on the thin client because the content gets decoded on the server and video is sent uncompressed over the network to the thin client. Kind of defeats the whole purpose of Flash. (Rant: Flash should be open sourced, it's a PITA on Ubuntu 64bit!)
On the Edubuntu website, it's advertised that it's very easy to install firefox as a local app. Well. It's kind of easy. See www.edubuntu.com/Download. In fact, my lts.conf looks like this:
$ cat /var/lib/tftpboot/ltsp/i386/lts.conf
# Global defaults for all clients
# if you refer to the local server, just use the
# "server" keyword as value
# see lts_parameters.txt for valid values
################
[default]
X_COLOR_DEPTH=16
LOCALDEV=True
SOUND=True
NBD_SWAP=True
SYSLOG_HOST=server
#XKBLAYOUT=de
LDM_DEBUG=no
LDM_DIRECTX=True
LOCAL_APPS_MENU=True
DNS_SERVER=10.0.0.1
#SCREEN_02 = shell
SCREEN_07 = ldm
By the way, I tried 'locate lts_parameters.txt' but found nothing.
alkisg on #ltsp says:zcat /usr/share/doc/ltsp-server/lts-parameters.txt.gz | less
So it's with a dash not and underscore. Someone should file a bug. Why not you!?
What I had to do to get firefox and flash installed:
sudo -s
chroot /opt/ltsp/i386
apt-get install firefox flashplugin-installer
exit
ltsp-update-image
exit
Firefox but no internet...
Firefox worked right away as local app. Not very fast (my thin client is not a powerhorse, that's what thin clients supposed to be: lean and mean, cheap, low RAM, etc. Be advised that Firefox and Flash need RAM and CPU and everything. No Pentium I with 64 MB that normally works fine as a thin client!
Okay, now how about some browsing? Sorry, you need to do a lot of things to make that possible. After some searching and with help of the kind people in #ltsp, I found this: wiki.ubuntu.com/ThinClientHowtoNAT
Dazzling uh?
My network has a firewall/squid proxy. The proxy is on 10.0.0.1:3128. My LTSP server is on 10.0.0.2 on the LAN side and on the Thin Client side it's 192.168.0.1. The thin clients are in the range 192.168.0.200 - 250, it's a seperate LAN (standard setup by the way).
Now can't I skip the whole ipforward and NAT? The NAT stuff is not that complicated but it opens a whole range of possibilities to get from the Thin Client LAN to the other LAN.
Maybe redir (a TCP redirector) will help? It's helped me many times, when migrating servers for example. Say your old POP3 server is on 1.2.3.4 and the new on on 1.2.3.5. After you changed your DNS there will be a period of time (up to 4 days with our local braindead provider) before all the DNS changes have propagated. Simply install redir on the old server and redirect all TCP traffic for port 110 to the new server. No one will notice any service outage, great!!!
So here's what I did:
sudo apt-get install redir
sudo redir --laddr=192.168.0.1 --lport=3128 --cport=3128 --caddr=10.0.0.1 --bind_addres=10.0.0.2
Here is an explanation of the options to redir:
--laddr: the local address of the LTSP server on the Thin Client side
--lport: arbitrary, but 3128 is the standard.
--cport: it's the port my squid proxy runs on by default
--caddr: the address of the firewall/proxy on the LAN
--bind_addr: the address of the LTSP server on the LAN side.
Be sure to make sure to ensure that redir is not quitting on you, it does that often, build some stuff around it that it will always restart.
The funny thing is that,after you told firefox to use 192.168.0.1:3128 as a http proxy, it also doesn't moan about not being able to resolve DNS. (See https://bugs.launchpad.net/ubuntu/+source/ltsp/+bug/348305 and https://help.ubuntu.com/community/UbuntuLTSP/LocalAppsResolvConf)
Of course it only works for http on port 80, but there are probably ways to make it work for https and other ports too. Is https really proxy-able? Hmm. Anyway, for simple requirements this is sufficient, and maybe Ubuntu 9.10 will have the NAT stuff all automated, that would be nice then this post will be absolutely obsolete. That'd be nice :-)
Oh, flash does give me sound but no image, but I guess that's some other problem.
See also https://wiki.ubuntu.com/ThinClientProxyRedirect
- 03-07-2009 ClamAV on Dapper
- 21-06-2009 Converting an Access database to mysql with mdbtools
- 14-05-2009 Zimbra, Kmail, Maildir convert, Kaddressbook imports and other Annoyances
- 11-04-2009 Installing Scalix 11.4 on Ubuntu 8.04 Hardy (32bit)
- 10-04-2009 Site slow after installing gzip compression: Transparent gzip and zlib.output_compression in PHP and Content-Length
- Presentatie: Google Everything
- 30-03-2009 GOsa, Gonicus, openldap and ubuntu 8.10 (gosa2)
- 16-03-2009 Linux Cursus Diverse Bedrijven
- 15-03-2009 Zimbra, Kmail, Maildir convert, Kaddressbook imports and other Annoyances
- 28-02-2009 Linux Cursus Fatum NV
- 06-02-2009 Interview Radio Hoyer
- 04-02-2009 Presentatie Curacao ICT Network
- 31-12-2008 Linux Cursus Directie Financien Nederlandse Antillen
- 31-12-2008 Linux Cursus E-commerce Park
- 11-12-2008 QwikZite drie keer genomineerd voor Innovatieprijs 2008
- 09-12-2008 Fatum Curaçao overweegt Open Source
- 13-11-2008 A big Linux advocate on a small island
- 01-11-2008 Open German Ministry
- 01-11-2008 SolarNetOne - Internetwork on Solar Energy
- 25-10-2008 Creating a hunspell dictionary for use as spellcheck in Open Office
- 23-10-2008 Open Amsterdam
- 09-10-2008 Verslag enquete Open Source
- 16-08-2008 CSS-only inline inplace edit (no javascript) in Ruby on Rails
- 15-08-2008 Using AJAX and link_to_remote with tabnav widgets in Ruby on Rails.
- 07-08-2008 Fixing plone-site on Ubuntu 8.04 Hardy
- 07-08-2008 Removing sendmail dependencies from spamass-milter on Ubuntu Dapper when using postfix
- 24-07-2008 Monitoring X Traffic with xmon on Ubuntu
- 23-06-2008 Thin Can DBE61 from Artecgroup on Hardy LTSP
- 18-06-2008 Avoiding Xgl on Ubuntu Hardy LTSP thin clients
- 13-06-2008 AMS-IX bouwt internet exchange op Curacao
- 29-05-2008 Eerste OLPC op Curacao
- 23-05-2008 Installing Ubuntu 5.10 Breezy as Virtual Machine with qemu or kvm
- 24-03-2008 IBM Lotus Forms (Formerly Workplace Forms, PureEdge)
- 14-03-2008 ltsp-build-client and apt-mirror
- 14-02-2008 Adding a second hard disk to winxp under qemu on ubuntu linux.
- 14-02-2008 Trouble with raid and lvm on Ubuntu Dapper
- 28-10-2007 Installing jEdit on Ubuntu
- 22-02-2006 auth_ldap for Apache 1.3: a patch to allow anonymous binds to work properly.
- QwikZite is een door Suares & Co ontwikkeld Content Management System, gericht op individuen en kleine organisaties die wel veel informatie te bieden hebben maar geen kennis van het opzetten van een website. QwikZite is flexibel en nodigt uit tot het actueel houden van uw site.
