Before we talk about what is a sticky bit let’s start by explaining why do we need it. For example we have a directory /var/share somewhere on the filesystem with a full access for all permission groups that is owner, group and any, thus all permission bits are set to “on” drwxrwxrwx:

# ls -ld /var/share/
drwxrwxrwx. 2 root root 4096 Mar  5 11:02 /var/share/

From the above, we can see that any user have read, write and execute permissions to the /var/share directory. Next, in our scenario we have two users named user1 and user2. Since everybody now have an access to /var/share directory, our user1 can navigate to this directory and simply create any arbitrary file:

user1@localhost ~]$ cd /var/share/
[user1@localhost share]$ touch file1
[user1@localhost share]$ ls -l file1 
-rw-rw-r--. 1 user1 user1 0 Mar  5 11:08 file1
[user1@localhost share]$

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The assigned swap memory can be disabled by using swapoff command. You can list all currently mounted and active swap partition by a following linux command:

# cat /proc/swaps
Filename                                Type            Size    Used    Priority
/dev/sda6                               partition       2047996 0       -1
/swap                              file            104857596       0       -2

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About

The automated build docker lamp image “linuxconfig/lamp” can be used as a testing and also as a production environment for a dynamic PHP applications. It comprises of Debian GNU/Linux, Apache webserver, MariaDB a community-developed fork of the MySQL relational database management system and PHP scripting language.

Deployment

The deployment of “linuxconfig/lamp” docker image is a fairly simple procedure. Let’ start by creating a sample PHP website with a MariaDB connection handle:

<?php
$dbh = mysqli_connect('localhost', 'admin', 'pass');
if (!$dbh) {
    die('Could not connect: ' . mysqli_error());
}
echo 'Connected successfully to MariaDB database';
mysqli_close($dbh);
?>

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To improve memory management on your Raspberry PI you may need to add an additional swap space. In this config you will learn how to add additional swap memory to your Raspberry PI with Raspbian.

First, you need to create a swap space eg. 500MB

dd if=/dev/zero of=/swap bs=1M count=512

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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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Abstract

This article will start with installation of OpenCV on Debian 5.0 ( Lenny ). Later a reader will be guided through a number of examples on how to use OpenCV to display an image, play a video and use camera to capture the video input stream.

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This config will describe a procedure to login to SMTP server using AUTH DIGEST-MD5 CRAM-MD5 encryption authentication method via telnet. First, we need to install all prerequisites:

# apt-get install telnet sasl2-bin

Before proceeding, you may need to install telnet if not already present. Using telnet command we will connect to SMTP server. The sasl2-bin package contains gen-auth command which we will use to generate our BASE64 encoded response to server’s authentication challenge. Lets’ start by using telnet command to connect to our server:

$ telnet 10.1.1.11 25
Trying 10.1.1.11...
Connected to 10.1.1.11.
Escape character is '^]'.
220 mail.localhost.localdomain ESMTP Postfix (Ubuntu)

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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

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