31 Mag 11 liborient: A simple LGPLv3 linux C library proof of concept
Today i posted to the orientdb mailinglist and I’ve written about liborient, my very first orientdb C library implementation.
We are searching for new developers to join. This is what I putted to the list.
Hi all.
I’m making an attempt to write a proof of concept, simple, LGPLv3
OrientDB C library for linux.
The library is written in best effort, so don’t kill me if you see bad
code for now…
As a starting point, there is already a very first implementation of
some simple binary protocol methods.
For those there are interested, this is the API that it’s just (it
seems…) working with the latest OrientDB SVN version:
http://www.tuxweb.it/temp/apishot/liborient/liborient_8h.html#func-members
You can view development code here:
http://svn.tuxweb.it/cgi-bin/viewvc.cgi/liborient/trunk/main/liborient/src/
INSTALL:
1) Install the latest GNU autoconf, automake and libtool
2) svn co http://svn.tuxweb.it/SVN/projects/liborient/trunk/main/liborient
3) cd liborient
4) ./autogen.sh
5) ./configure –prefix=/tmp/liborient
6) make
7) make check
8) make install
Warning: this is a very first proof of concept implementation that I
started to study OrientDB. Do not use it in production environments.
Even if I think “the scalable way”, I’m a Linux SysAdmin and not a
full time developer, so may be the API is not well designed and the
code is ugly.
We need people that write code. If you are interested, please join in
and contribute.
This is a sample C program that links liborient… and works 🙂
http://svn.tuxweb.it/cgi-bin/viewvc.cgi/liborient/trunk/main/liborient/test/single_orient.c?view=markup
<snip>
orientdb *oh;
o_conh *och;
unsigned long cid;
// create a new liborient handler
oh = orient_new();
// setup library debug level to “ORIENT_DEBUG”
orient_debug_setlevel(oh, ORIENT_DEBUG);
// setup debug callback
orient_debug_sethook(oh, &your_debug_function);
// preparing to open a new binary connection handler for orientDB
och = orient_prepare_connection(oh, ORIENT_PROTO_BINARY, “localhost”, “2424”);
// setting admin credentials
orient_set_credentials(oh, och, ORIENT_ADMIN, “root”, “pippo”);
// setting user credentials
orient_set_credentials(oh, och, ORIENT_USER, “reader”, “reader”);
// create the real connection with orientdb server
cid = orient_connect(oh, och, timeout);
// open the database “demo”
orient_dbopen(oh, och, cid, “demo”, timeout);
// get the DB size
dbsize = orient_db_size(oh, och, cid, timeout);
// get the total number of records
records = orient_db_countrecords(oh, och, cid, timeout);
// close the database
orient_dbclose(oh, och, cid, timeout);
// free library stuff
orient_free(oh);
</snip>
Any thoughts?
Ciao, Dino Ciuffetti.
18 Mag 11 orientdb svn build
OrientDB is a fast, scalable, open source object / graph database server written in Java.
After more than 20 years of RDBMS predominance it’s now time to switch to non relational database systems, specially where scalability and query response time are two fundamental things to achieve a better user (web or not) experience.
So, how to get up and running quickly with orientdb?
Here we will build on a linux system the latest development version from source in no time: the simple way ™.
First thing to do is to download JDK Java Standard Edition 6 from http://www.oracle.com/technetwork/java/javase/downloads/index.html.
Please note that you will need the JDK and not JRE.
After that you will need Apache Ant. Download it from here: http://ant.apache.org/bindownload.cgi.
# cd /opt
# tar jxf apache-ant-1.8.2-bin.tar.bz2
Installed? Good. Now install subversion (svn). You can install it for example using your favorite distribution specific package manager, for example if you are using debian or ubuntu you could use apt-get utility, like that:
# apt-get update; apt-get install subversion
You have now to create a directory where you like on the system and begin to download the OrientDB development snapshot:
# mkdir /home/dino/orientdb-source
# cd /home/dino/orientdb-source
# svn checkout http://orient.googlecode.com/svn/trunk/ orient-read-only
When finished cd to orient-read-only.
You have now to set your JDK and ANT bin directories into your PATH system variable. You can do it by this way:
# export PATH=/opt/apache-ant-1.8.2/bin:/opt/jdk1.6.0_25/bin:$PATH
You can now begin to compile orient source code.
# ant clean
# ant
# ant test
# ant install
Ok. If compiled successfully, you now have to startup orient for the first time.
# cd /home/dino/releases/1.*-SNAPSHOT/bin
# chmod 754 *.sh
# ./server.sh
Ok. Now stop it with CTRL+C and modify the configuration file as you like:
# cd ../config
# vi orientdb-server-config.xml
The first thing to configure, if you need to publish the service on your network/internet, is the bind address. For example, to bind on any ip on the system: <listener ip-address=”0.0.0.0″ port-range=”2424-2430″ protocol=”distributed”/>
The second parameter to change is the root password: <user name=”root” password=”pippo” resources=”*”/>
Now start orientdb again:
# cd /home/dino/releases/1.*-SNAPSHOT/bin
# nohup ./server.sh 1>/dev/null 2>/dev/null &
You should now have done.
Connect your browser to http://127.0.0.1:2480/ and begin to play with your brand new orientdb studio web console:
host: localhost
user: writer
password: writer
database: demo
You can find open and solved issues here: http://code.google.com/p/orient/issues/list
Subscribe yourself to the orientdb users mailing list service: http://groups.google.com/group/orient-database, and enjoy!!
15 Mag 11 How to cleanly install apache httpd webserver from source
Apache is a great piece of software and it’s very powerful. You can here find how to install apache web server, “The right and quick way” ™ 🙂 Apache will be compiled with modules support.
We begin downloading source code from httpd.apache.org official website.
Important: for security reasons download apache only from the official website or by your distribution vendor (redhat, debian, etc)!
Important: choose the right version for you, but if you can pick the last stable version of 2.2.X.
You can then untar your fresh apache source distribution and beginning to play with configure:
tar jxvf httpd-2.2.??.tar.bz2
cd httpd-2.2.??
./configure –with-included-apr –with-expat=builtin –prefix=/your_apache_installation_path –enable-mods-shared=most –enable-ssl –enable-proxy –enable-proxy-connect –enable-proxy-http –enable-proxy-balancer
Here we are going to compile apache with most of its modules compiled as shared objects and obviously with the shared object support enabled.
May be that the configure process will not find something. If so, remember to download and install the development version of the needed library. I always use the development package of the distribution (ex. libssl-dev, openssl-devel, etc).
If the configure process fails because of a dependency (development!!!) library not found but you already installed it, it means that the apache building tool does not find it.
Sometimes, in not standard environments (hpux, etc) apache will not find the openssl dev library but it’s installed. For example if apache fails a dependency check on openssl, you can fix the problem passing the argument –with-ssl=/ssl_path to configure.
If the configure pass, you have to call:
make
If the make process pass without problems, you have to execute:
make install
If you have problems compiling apache, most probably the problem is that you failed to install building prerequisites: development libraries, or the building tool cannot find where they are installed. If the configure fails you can take a read on config.log or reading the configure file (it’s a generated shell script) searching for the reported error and finding the cause by yourself (wrong path of the library?). If the failing stuff fires on compiling (make) you have to find the problem going to the source directory reported by the make utility and searching for the source file that it’s failing. You may require a patch, may be you caught a apache bug or may be your compiling chain is not clean.
I have to go now, let me know if you have problems.
Ciao, Dino.
01 Apr 11 Setting VirtualBox guest bios time offset
Hi.
If you have a guest VirtualBox VM with the system clock out of sync with your host system, and when you try to set the guest system time manually it get automatically setted out of sync, you may want to run this command on your host system:
VBoxManage modifyvm <vm_name> –biossystemtimeoffset <time offset in ms>
Hope you get out of this trouble quickly. That took me hours to debug it!!
05 Mar 11 Great event, great day
Today was one of the most productive day of the year for me. Codemotion event was great, full of great talks, good new ideas and tech staff demistified.
Great speech on orientdb and nosql by Luca Garulli and very good talk by Alessandro Nadalin: “REST in peace”, the RESTful + ESI correct usage.
08 Feb 11 NuvolaBase.com, the OrientDB on the Cloud
So this is finally there. NuvolaBase.com (alpha release) has been published yesterday at UIM-GDB in Barcelona by Luca Garulli, the OrientDB author.
I am really excited as TuxWeb cofounder for joining our technical collaboration with him for the alpha realization of this project.
I personally cover all the system administration and low level stuff.
– dAm2K!!
07 Set 10 N4g10s monitoring system
Server Room – AD 2034
Sys techie 01A2B: Hey boss, we just had a complete network crash! It seems our main router got down 3 seconds ago, and the main network branch red blinks on our N4g10s monitoring system!!
Network Boss: Uhh… that’s strange, because it’s coupled with a network HA backup. Go upstairs to the router cabinet and check immediately!
Sys techie 01A2B: Ok boss. I’m going… …
Network Boss: what’s up?
Sys techie 01A2B: Hey boss, the two routers have been stolen!! The cables are detached and unlinked, no routers present here!!
Network Boss: mmmhhh… I’m getting there. Wait.
Sys techie 01A2B: .. Hey boss the routers are there now!! That was the cleaning lady! She thought there was time to clean the routers from dust…
Network Boss: ok ok, re create links, please. I’m going to handle angry users now… And get up and running quickly!
[A Angry User]: Hey, I am experimenting a network problem! What’s up?
Network Boss: Which network problem? There is not a network problem. Please retry.
[A Angry User]: mmhh… very strange, it now works! Sorry, that was a false negative. May be a client Winblows problem. Thank you.
Network Boss: Please double check next one. Hi man.
24 Ago 10 Why do not host sites from your own home
I would not recommend you to host sites that way, you have to be sure that your ISP give you public IP(s) and setup your router to port forward ports 80, 443, 53, and so on.
There are other problems too:
1) if you want to host more than one site with SSL you must have one public IP for each SSL site or use different SSL ports for each site, because name virtualhosting with SSL is not possible;
2) dsl lines are not designed to be stable. The connection can go down and make your site not visible. This is a major problem if you make the mistake to have your own DNS server on it!! The ISP assigned public IP address can change more than one time a day and you have to sync the DNS zone each time.
3) dsl ips are putted into DNS based blacklists zones. You may not be reached from various HTTP proxy servers around the world. For the same reason you cannot send mails, for example originated from your sites.
4) adsl lines are asymmetric (unbalanced for download). You have few kbytes per second in upload, that is just what you need to publish web sites, so this can be a problem when you have just more than 3 users.
5) you probably have problems with High-Availability and Load-Balancing on domestic hardware and you may have blackouts.
6) DNS subsystem may need primary and secondary DNS servers.
The best way (imho) is to use services like slicehost where you have a HA virtual server slice running linux, public IP addresses, free primary and secondary DNS hosting service, large public bandwidth, disk space… and not last your own root password that you can use to have maintenance on your own server for your own.
https://manage.slicehost.com/customers/new?referrer=af57db3020e04bb27352e271753a7a18
26 Mar 10 Il tuo server linux personale
Se quello che hai sempre cercato e’ avere il tuo personalissimo server linux up and running 24 ore su 24, SliceHost e’ l’opzione giusta per te.
Questa meravigliosa azienda americana (in Italia purtroppo certe cose ce le sogniamo alla grande!) ha sviluppato un sistema automatico con interfaccia web in grado di fornirti in tempo reale per pochi dollari al mese una tua personalissima macchina virtuale con cui potrai realizzare e gestire il tuo server linux in tutta tranquillita’.
Banda e connettivita’ internazionale a internet non sono un problema e potrai scegliere tra vari tagli di offerte pronte per te.
Se sei interessato, dai un’occhiata al sito https://manage.slicehost.com/customers/new?referrer=af57db3020e04bb27352e271753a7a18 e affiliati anche tu.
Avrai la possibilita’ di scegliere la distribuzione linux che piu’ ti aggrada e il tuo server linux personale sara’ in piedi in pochi secondi.
Noi di TuxWeb lo stiamo utilizzando con successo per gestire i siti internet di alcuni nostri clienti.
Ciao, Dino – http://www.tuxweb.it/
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