This article is just a continuation of my first article about my experience with mobile broadband Internet on a Linux system. To cut the long story short a current network managers are trying to do a pretty good job by establishing a Mobile Broadband connection in a Plug & Play manner, however, they are not always successful to do so and user ends up with frustration and full hands of debugging and guessing what might went wrong instead of spending time with intended work.
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Automatic HTML form submission using WWW::Mechanize
Here is a short tip on how to automatically submit a HTML form using a Linux command line and perl script. For this example we would need a WWW::Mechanize perl module and some basic PHP website. Let’s start with simple PHP website. The website will consist of two files:
form.php:
<form action="submit.php" method="post"> First Name: <input name="fname" type="text" /> Last Name: <input name="lname" type="text" /> <input type="submit" /> </form>
Joomla content management system Docker image deployment and usage
About
The automated build docker Joomla content management system (CMS) image “linuxconfig/joomla” can be used to instantly deploy Joomla CMS on your docker hosts.
Configuration
The Joomla CMS application runs on Debian GNU/Linux system featuring Apache web server, MariaDB ( MySQL ), database and PHP5. A new docker container based on “linuxconfig/joomla” will expose port 80 which can be linked to the docker host port for an immediate Joomla web site access and configuration.
Configured MySQL users:passwords:
- root:”empty password”
- admin:”pass”
Configured MySQL databases:
- joomla
Exposed ports:
- 80
Deployment
Below command will download and create a new docker container called joomla and link local host system port 80 with container’s exposed port 80.
# docker run -d --name=joomla -p 80:80 linuxconfig/joomla
Choosing the right Linux File System Layout using a Top-Bottom Process
July 31, 2009
By Pierre Vignéras
Abstract:
As you may probably know, Linux supports various filesystems such as ext2, ext3, ext4, xfs, reiserfs, jfs among others. Few users really consider this part of a system, selecting default options of their distribution’s installer. In this article, I will give some reasons for a better consideration of the file-system and of its layout. I will suggest a top-bottom process for the design of a “smart” layout that remains as stable as possible over time for a given computer usage.
Introduction
The first question that you may ask is why are there so many file-systems, and what are their differences if any? To make it short (see wikipedia for details):
- ext2: it is THE Linux fs, I mean, the one that was specifically designed for linux (influenced by ext and Berkeley FFS). Pro: fast; Cons: not journalized (long fsck).
- ext3: the natural ext2 extension. Pro: compatible with ext2, journalized; Cons: slower than ext2, as many competitors, obsolete today.
- ext4: the last extension of the ext family. Pro: ascending-compatibility with ext3, big size; good read performance; cons: a bit too recent to know?
- jfs: IBM AIX FS ported to Linux. Pro: mature, fast, light and reliable, big size; Cons: still developed?
- xfs: SGI IRIX FS ported to Linux. Pro: very mature and reliable, good average performance, big size, many tools (such as a defragmenter); Cons: none as far as I know.
- reiserfs: alternative to ext2/3 file-system on linux. Pro: fast for small files; Cons: still developed?
There are other file-systems, in particular new ones such as btrfs, zfs and nilfs2 that may sound very interesting too. We will deal with them later on in this article.
So now the question is: which file-system is the most suitable for your particular situation? The answer is not simple. But if you don’t really know, if you have any doubt, I would recommend XFS for various reasons:
Resetting Vodafone USB mobile broadband device with usb_modeswitch
First time I used my vodafone USB mobile broadband device on my Fedora Linux system it worked perfectly . However, after couple minutes I got disconnected I was not able to connect again even when the blue light on the Vodafone USB mobile broadband device was making a clear blue blinking signal that network was found and all I need to do is to just connect. Eventually after many attempts to make an Internet connection I had reseted it with a usb_modeswitch command to make it working again. It is not guaranteed solution but its worth to try.
If you are in the same situation you may also try to reset your Vodafone USB mobile broadband device. To do that we first need vendor and product ID in a hexadecimal form. To get this information execute:
$ lsusb
Find by IP – Perl IP to location Example
In the next few lines we are going to describe a process of how to retrieve and geographical information from an IP address . For this we will use a MAxMind Perl API module. This company also provides a data file GeoLiteCity which is free but is less accurate than the paid version. As for a preparation part first we need to download a GeoIP perl module and data file:
$ cd $ mkdir GeoIP $ cd GeoIP $ wget http://geolite.maxmind.com/download/geoip/api/perl/Geo-IP-1.38.tar.gz $ wget http://geolite.maxmind.com/download/geoip/database/GeoLiteCity.dat.gz
While in the GeoIP directory the next step is to extract both packages:
$ tar xzf Geo-IP-1.38.tar.gz $ gunzip GeoLiteCity.dat.gz
It should be pointed out that this article assumes that your are running some distribution of Linux with PERL interpreter.