It happens that sometimes you need to access a remote box which supports ssh key authentication. Recently I was trying to reproduce a bug related to SSH public key authentication, so here I would like to share some of my experience.

There will be no explanation of the public key authentication itself here, rather the actual setup and steps to have a public key auth for Windows(client) -> Linux(server) working. Why Windows you would ask? Because interactions for Linux->Linux and for Mac OS X -> Linux simply work using the Unix way, while for Windows you may need some extra actions to do.

Setup

What I had at endpoints:

• Linux –

Ubuntu 11.04, sshd is set up to deny password auth.
Windows – well, it is an XP SP3 i386 box. MySQL Workbench 5.2.34+ is installed

First of all I created an encrypted pair of RSA keys, …

I hope everyone is enjoying summertime, at least in the northern hemisphere. I’m about to head out to the pool, but before I go, here is a summary of this week’s blog posts.

1. Introduction to Perl interface for Monitis API
Monitis announces a simple way to access its API through Perl, a high-level, general-purpose, interpreted, dynamic programming language. This post demonstrates some examples for using the API with Perl and describes some of the benefits of the programming language. The source can be found on our Github page.

2. 101 Tips to MySQL Tuning and Optimization …

getopts
The getopts command simplifies the task of validating and parsing command line options and arguments for your shell scripts.

Syntax:

getopts <optstring name> [arg...]

Example:

Step1: First I define all my option holding variables.

ListFiles=0
MoveFiles=0
email=""

Step2: While loop.

The following while statement loops through all the options and sets them to the corresponding variable. getopts returns true while there are options to be processed. The argument string, here "lme:h", specifies which options the script accepts. If the user specifies an option which is not in this string, it will go into * section which will display a help to use this script with examples. If the option is succeeded by a colon, the value immediately following the option is …

Virtualizing all parts of today’s software infrastructure has become a priority for many. Creating a more flexible and dynamic environment with improved availability enables organizations to accelerate innovation, reduce time to market, cut costs and deliver higher uptime.

Databases have rarely been the first candidates for virtualization – mainly as a result of fears in consolidating such critical resources, and in I/O overhead that may have degraded service levels. However with improvements in hypervisor designs coupled with more powerful commodity server hardware and repeatable best practices, many of these concerns are rapidly diminishing.

It was in this context that we began development of the Oracle VM Template for MySQL Enterprise Edition, making the world’s leading web database radically simpler to deploy, manage, and support in a virtualized environment.

Along with the development team, we will be hosting a …

A herd of Hadoop announcements. Rockmelt raises $30m. And more.

A herd of Hadoop announcements
# Yahoo! and Benchmark Capital confirmed the formation of Hortonworks, an independent company focused on the development and support of Apache Hadoop.

# Cloudera announced the availability of Cloudera Enterprise 3.5 and the launch of Cloudera SCM Express, based on the new Service and Configuration Manager in Cloudera Enterprise 3.5.

# MapR …

We all know du command to get the size of a directory. But the problem is when you use "du <directory name>" it will give you the list of all subdirectory including the directory you want with size.

Bt what if i only want the size of directory which i have passed as an argument and not all the subdirectory?

In that senario we can use:

du -sh <directory name>                              

Example 1:

du -h /home/mysql/admin/                             
   1K   …

I’ve done some benchmark testing of 2 Python modules for MySQL data retrieval: MySQLdb and pyhs. MySQLdb uses MySQL’s client libraries, whereas pyhs uses HandlerSocket that bypasses MySQL’s client layer and interfaces Innodb storage engine’s files directly. In my testing, HandlerSocket results in 82% improvement over mysql client libraries based on number of rows retrieved. The tests were conducted under different conditions: right after a start when cache is cold, a warmed up cache after running SELECT * FROM customer, and alternating the execution order of those 2 Python files. The results are fairly consistent in that they all fall in the same range. …

Vim or vi is a text editor. It can be used to edit all kinds of plain text. It is especially useful for editing programs or UNIX/Linux configuration files.Turn on syntax highlighting:
Open file (for example test.sh):$ vi test.shNow press ESC key to enter into command mode then type  ” : syntax on OR syn on”:syntax onOR:syn onThat’s it.. the color syntax highlighting will be enabled until you close that file (useful when you working on server where you can’t enable it permanently because of restriction and not having desired access of .vimrc file.)
Turn off syntax highlighting:
Press ESC key to enter into command mode then type “: syntax off OR syn off”:syntax offOR: syn off
Enable color syntax highlighting permanently:
You may need to add "syntax on" (or "syn on") in your $HOME/.vimrc file$ vi …

Despite the fact that dbForge products were developed only for Windows platforms, our active users (thanks to Tsvetkov) have found a way to use some features of dbForge Studio for MySql on Linux family operating systems.

Tests were run under .Net Framework 2.0 on Wine emulator.

The following command line functionality works with no visible issues:

• /backup – backups a database
• /restore – restores a database
• /datacompare – launches a data comparison
• /datacompare /sync – launches a database synchronization
• /schemacompare – launches a schema comparison
• /schemacompare /sync – launches a database synchronization
• /dataexport (starting from version 5.0) – exports data
• /dataimport (starting from version 5.0) – imports data
…

Despite the fact that dbForge products were developed only for Windows platforms, our active users (thanks to Tsvetkov) have found a way to use some features of dbForge Studio for MySql on Linux family operating systems. Tests were run under .Net Framework 2.0 on Wine emulator. The following command line functionality works with no visible [...]