Posts Tagged ‘application’

Helpful Hints For Starting A Small WordPress Website or Ecomerce Business

Wednesday, August 14th, 2019

hints-for-starting-wordpress-site

Wordpress is the web application collection of PHP program behind thirty four percent (43%) of the internet’s websites, and fifteen percent (50%) of the top one hundred websites in the world, so if you’re considering it for your website then you’re perhaps thinking in the right direction. Small start-up projects a community website or even a small personal owned blog or mid to even large business presentation site  can benefit greatly from setting up their Web Platrform or Ecommerce shops on a WordPress website platform (that of itself depends just on a small number of technologies such as a Linux server with a Web Server installed on it to serve PHP as well as some kind of Linux host installed Database  backend engine such as MYSQL / PostgreSQL etc. …

But if you really want to create a successful ecommerce website on WordPress, that can seem a little intimidating at first as the general complexity to start up with WordPress looks very scary in the beginning. However in this article I’ll point to fewhelpful hints should get you off on the right foot, and make your entry into the world of Wodpress / WP Ecommerce a little easier and less scary.

This article is to be less technical than expected and in that will contrast slightly with many of the articles on this blog, the target audience is more of Web Marketing Manager or a Start-up Search Engine Optimization person at a small personal project or employed in the big bad corporate world.This is no something new that is going to be outlined in this article but a general rules that are known for the professional SEO Gurus but is most likely to be helpful for the starting persons.

If you happen to be one of these you should know you have to follow a set of well known rules on the website structure text, descriptions, text, orientation, ordering of menus and data etc. in order to have the WordPress based website running at full speed attracting more visitors to your site.
 

Photos
 

 

Importance of Photos on a Webiste
Although the text for your website is very important – more on that later – when a user first opens up your website in their browser, their eyes are going to be caught by the images that you have laid out on your website. Not using images is a big mistake, since it bores users’ eyes and makes your website seem amateur and basic, but using low quality images or irrelevant images can also harm your chances of appearing authentic to a user (yes here on this blog there are some of this low quality pictures but this is due to fact this website is more of information blog and not ecommerce. Thus at best case always make sure that you find the best, high-quality images for your website – make sure that you have the correct rights to use the images as well (as copyright infrignmenets) could cause you even a law suits ending in hundred or thousand dollar fines or even if this doesn't happen any publicity of such would reduce your website indexing rating. The images placed should always be relevant to your website. If you find a breath-taking sunset or tech-gadget picture, that’s great, but maybe not for your healthy food ecommerce store, but for your personal ranting or describing a personal experience.

 

Product Photos


Assuming that sooner or later even if you have a community website you will want to monerize it to bring back to yourself in material form at least part of the many years effort to bring the site to the web rank gained.
Leading on from that point, you’re going to be selling or advertise items – that’s the whole point of ecommerce. But users often find ads / online shopping frustrating due to not being able to properly see and understand what they’re buying before they make their purchase. This can lead to ‘buyer’s remorse’, and, consequently, refunds galore, which is not what you want. Make sure that images of your products are always available and of a high quality – investing in a fairly high quality camera might be a good idea – and consider many pictures for different angles or even rotating images so that the user can decide for themself which angle they want to look at.

 

Engaging Descriptions


“I can guarantee that you can’t remember the last five product descriptions you read – not even word-for-word, but the general ideas and vocabulary used will have been tossed into your short-term memory and forgotten in an instant. This is where your website can shine, and become better than ninety percent of those lingering on the internet,” Matthew Kelly, a project manager at WriteMyX and NextCoursework, suggests, “since putting effort into writing your product descriptions and making them lively and engaging will make your website memorable, and your subscribers will turn helpfully soon loyal customers will be more likely to come back time and time again and become repeat business, as well as mention you to their friends (social mounth to mouth marketing) and that way working as free advertising for you and making your website incredibly effective.”

 

Mobile-Friendly

 

Which device is most used to check email Laptop / PC or Mobile statistics as of year 2019

These days with the bloom of Mobile Devices that are currently overrunning the user of normal Desktop PCs, Laptops and Tablets and this trend is likely to stay and even increase, “If your website isn’t mobile-friendly in this day and age, then you won’t get anywhere with it.” Anne Baker, a marketer at BritStudent and Australia2Write, states. “Most people use their phones when they access websites, especially when they go shopping on the internet.

Statistics on user stay (secs / mins) stay on a website from Desktop PC and Mobile devices

On WordPress, this means finding a more recent theme – an older theme, maybe four-five years old, will probably not support mobile, and you just can’t afford to lose out on the mobile market.” In short, find yourself a mobile-friendly theme or install the right WordPress Pluguin that will enable you to have a Mobile Friendly theme in case if blog is accessed from a Mobile Dev or many of your customers will become frustrated with the badly formatted ‘mobile’ version of your website that they end up using, which might be for instance meant for a much larger screen. It can also ruin the atmosphere (experience) created at the accessed user site and have negative impact on your audience opion of your site or business. This is even more the case  if your website or webapp is targetting to be modern and keeping with the times – or especially if it deals with IT and electronics (where the competition is huge)!

 

Registration

 

Registration Ecommerce website

Registration form (Sign Up) on a website and the overall business cycle idea behind web product or business is of critical importance as this is the point that will guarantee intimidation with the customer, failing to have the person be engaged will quickly make your website rank lower and your producs less wanted. The general rule here is to make your registration be an easy (to orientate for the user) and be present on a very visible place on the site.

Registration steps should be as less as possible as this might piss off the user and repel him out of the site before the registration is completed. Showing oportunity to register with a Pop-Up window (while the user clicks on a place showing interest for the produce might be useful in some cases but generally might also push the user back so if you decide to implement it do it with a lot of care (beware of too much aggressive marketing on our site).

An example


The registration process should be as intimidating as possible to leave joy in the user that might later return and log in to your site or ecommerce platform, e.g. be interested to stay for a longer time. The marketing tactic aiming to make the user stay for a longer time on the website (dragging his attention / interest to stuff)  is nothing new by the way as it is well known marketing rule integrated in every supermarket you buy groceries, where all is made to keep you in the shop for as longer as possible. Research has shown that spending longer time within the supermarket makes the user buy more.

 

Returning customers can be intimidated with membership or a free gift (be it even virtual picture gift – free email whatever) or information store place could be given or if products are sold, registration will be obligatory to make them use their payment method or delivery address on next login to easify the buy out process. But if registration is convoluted and forced (e.g. user is somehow forced to become meber) then many customers will turn away and find another website for their shopping needs. Using a method like Quora’s ‘login to see more’ in that case might be a good idea even though for me this is also a very irritating and irritating – this method however should never be used if you run a ecommerce selling platform, on ecommerce site gatekeeping will only frustrate customers. Login is good to be implmeneted as a popup option (and not taking too much of the screen). Sign up and Login should be simplistic and self-explanatory – always not required but optioned and user should get the understanding of the advantage to be a member of the website if possible before the sign up procedure. Then, customers are more likely to sign up and won’t feel like they’ve been pushed into the decision – or pushed away, as the case may be.

Katrina Hatchett works as a lifestyle blogger at both Academic Brits and Assignment Help, due to a love of literature and writing, which she has had since youth. Throughout her career, she has become involved with many projects, such as writing for the PhD Kingdom blog.

Howto create Linux Music Audio CD from MP3 files / Create playable WAV format Audio CD Albums from MP3s

Tuesday, July 16th, 2019

cdburning-audio-music-cd-from-mp3-on-linuxcomapct-disc-tux-linux-logo

Recently my Mother asked me to prepare a Music Audio CD for her from a popular musician accordionist Stefan Georgiev from Dobrudja who has a unique folklore Bulgarian music.

As some of older people who still remember the age of the CD and who had most likely been into the CD burning Copy / Piracy business so popular in the countries of the ex-USSR so popular in the years 1995-2000 audio ,  Old CD Player Devices were not able to play the MP3 file format due to missing codecs (as MP3 was a proprietary compression that can't be installed on every device without paying the patent to the MP3 compression rights holder.

The revolutionary MP3 compression used to be booming standard for transferring Music data due to its high compression which made an ordinary MP3 of 5 minutes of 5MB (10+ times more compression than an ordinary classic WAV Audio the CPU intensiveness of MP3 files that puts on the reading device, requiring the CD Player to have a more powerful CPU.

Hence  due to high licensing cost and requirement for more powerful CPU enabled Audio Player many procuders of Audio Players never introduced MP3 to their devices and MP3 Neve become a standard for the Audio CD that was the standard for music listening inside almost every car out there.

Nowdays it is very rare need to create a Audio CD as audio CDs seems to be almost dead (As I heard from a Richard Stallman lecture In USA nowadays there is only 1 shop in the country where you can still buy CD or DVD drives) and only in third world as Africa Audio CDs perhaps are still in circulation.

Nomatter that as we have an old Stereo CD player on my village and perhaps many others, still have some old retired CD reading devices being able to burn out a CD is a useful thing.

Thus to make mother happy and as a learning excercise, I decided to prepare the CD for her on my Linux notebook.
Here I'll shortly describe the takes I took to make it happen which hopefully will be useful for other people that need to Convert and burn Audio CD from MP3 Album.

 

1. First I downloaded the Album in Mp3 format from Torrent tracker

My homeland Bulgaria and specific birth place place the city of Dobrich has been famous its folklore:  Galina Durmushlijska and Stefan Georgiev are just 2 of the many names along with Оркестър Кристал (Orchestra Crystal) and the multitude of gifted singers. My mother has a santiment for Stefan Georgiev, as she listened to this gifted accordinist on her Uncle's marriage.

Thus In my case this was (Стефан Георгиев Хора и ръченици от Добруджа) the album full song list here If you're interested to listen the Album and Enjoy unique Folklore from Dobrudja (Dobrich) my home city, Stefan Georgiev's album Hora and Rachenica Dances is available here

 


Stefan_Georgiev-old-audio-Music-CD-Hora-i-Rychenici-ot-Dobrudja-Horos-and-Ruchenitsas-from-Dobrudja-CD_Cover
I've downloaded them from Bulgarian famous torrent tracker zamunda.net in MP3 format.
Of course you need to have a CD / DVD readed and write device on the PC which nowdays is not present on most modern notebooks and PCs but as a last resort you can buy some cheap External Optical CD / DVD drive for 25 to 30$ from Amazon / Ebay etc.

 

2. You will need to install a couple of programs on Linux host (if you don't have it already)


To be able to convert from command line from MP3 to WAV you will need as minimum ffmpeg and normalize-audio packages as well as some kind of command line burning tool like cdrskin  wodim which is
the fork of old good known cdrecord, so in case if you you're wondering what happened with it just
use instead wodim.

Below is a good list of tools (assuming you have enough HDD space) to install:

 

root@jeremiah:/ # apt-get install –yes dvd+rw-tools cdw cdrdao audiotools growisofs cdlabelgen dvd+rw-tools k3b brasero wodim ffmpeg lame normalize-audio libavcodec58

 

Note that some of above packages I've installed just for other Write / Read operations for DVD drives and you might not need that but it is good to have it as some day in future you will perhaps need to write out a DVD or something.
Also the k3b here is specific to KDE and if you're a GNOME user you could use Native GNOME Desktop app such brasero or if you're in a more minimalistic Linux desktop due to hardware contrains use XFCE's native xfburn program.

If you're a console / terminal geek like me you will definitely enjoy to use cdw
 

root@jeremiah:/ # apt-cache show cdw|grep -i description -A 1
Description-en: Tool for burning CD's – console version
 Ncurses-based frontend for wodim and genisoimage. It can handle audio and

Description-md5: 77dacb1e6c00dada63762b78b9a605d5
Homepage: http://cdw.sourceforge.net/

 

3. Selecting preferred CD / DVD / BD program to use to write out the CD from Linux console


cdw uses wodim (which is a successor of good old known console cdrecord command most of use used on Linux in the past to burn out new Redhat / Debian / different Linux OS distro versions for upgrade purposes on Desktop and Server machines.

To check whether your CD / DVD drive is detected and ready to burn on your old PC issue:

 

root@jeremiah:/# wodim -checkdrive
Device was not specified. Trying to find an appropriate drive…
Detected CD-R drive: /dev/cdrw
Using /dev/cdrom of unknown capabilities
Device type    : Removable CD-ROM
Version        : 5
Response Format: 2
Capabilities   :
Vendor_info    : 'HL-DT-ST'
Identification : 'DVDRAM GT50N    '
Revision       : 'LT20'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Using generic SCSI-3/mmc   CD-R/CD-RW driver (mmc_cdr).
Driver flags   : MMC-3 SWABAUDIO BURNFREE
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R

You can also use xorriso (whose added value compared to other console burn cd tools is is not using external program for ISO9660 formatting neither it use an external or an external burn program for CD, DVD or BD (Blue Ray) drive but it has its own libraries incorporated from libburnia-project.org libs.

Below output is from my Thinkpad T420 notebook. If the old computer CD drive is there and still functional in most cases you should not get issues to detect it.

cdw ncurses text based CD burner tool's interface is super intuitive as you can see from below screenshot:

cdw-burn-cds-from-console-terminal-on-GNU-Linux-and-FreeBSD-old-PC-computer

CDW has many advanced abilities such as “blanking” a disk or ripping an audio CD on a selected folder. To overcome the possible problem of CDW not automatically detecting the disk you have inserted you can go to the “Configuration” menu, press F5 to enter the Hardware options and then on the first entry press enter and choose your device (by pressing enter again). Save the setting with F9.
 

4. Convert MP3 / MP4 Files or whatever format to .WAV to be ready to burn to CD


Collect all the files you want to have collected from the CD album in .MP3 a certain directory and use a small one liner loop to convert files to WAV with ffmpeg:
 

cd /disk/Music/Mp3s/Singer-Album-directory-with-MP3/

for i in $( ls *.mp3); do ffmpeg -i $i $i.wav; done


If you don't have ffmpeg installed and have mpg123 you can also do the Mp3 to WAV conversion with mpg123 cmd like so:

 

for i in $( ls ); do mpg123 -w $i.wav $i.mp3; done


Another alternative for conversion is to use good old lame (used to create Mp3 audio files but abling to also) decode
mp3 to wav.

 

lame –decode somefile.mp3 somefile.wav


In the past there was a burn command tool that was able to easily convert MP3s to WAV but in up2date Linux modern releases it is no longer available most likely due to licensing issues, for those on older Debian Linux 7 / 8 / 9 / Ubuntu 8 to 12.XX / old Fedoras etc. if you have the command you can install burn and use it (and not bother with shell loops):

apt-get install burn

or

yum install burn


Once you have it to convert

 

$ burn -A -a *.mp3
 

 

5. Fix file naming to remove empty spaces such as " " and substitute to underscores as some Old CD Players are
unable to understand spaces in file naming with another short loop.

 

for f in *; do mv "$f" `echo $f | tr ' ' '_'`; done

 

6. Normalize audio produced .WAV files (set the music volume to a certain level)


In case if wondering why normalize audio is needed here is short extract from normalize-audio man page command description to shed some light.

"normalize-audio  is  used  to  adjust  the volume of WAV or MP3 audio files to a standard volume level.  This is useful for things like creating mp3 mixes, where different recording levels on different albums can cause the volume to  vary  greatly from song to song."
 

cd /disk/Music/Mp3s/Singer-Album-directory-with-MP3/

normalize-audio -m *.wav

 

7. Burn the produced normalized Audio WAV files to the the CD

 

wodim -v -fix -eject dev='/dev/sr0' -audio -pad *.wav


Alternatively you can conver all your MP3 files to .WAV with anything be it audacity
or another program or even use 
GNOME's CDBurn tool brasero (if gnome user) or KDE's CDBurn which in my opinion is
the best CD / DVD burning application for Linux K3B.

Burning Audio CD with K3b is up to few clicks and super easy and even k3b is going to handle the MP3 to WAV file Conversion itself. To burn audio with K3B just run it and click over 'New Audio CD Project'.

k3b-on-debian-gnu-linux-burn-audio-cd-screenshot

For those who want to learn a bit more on CD / DVD / Blue-Ray burning on GNU / Linux good readings are:
Linux CD Burning Mini Howto, is Linux's CD Writing Howto on ibiblio (though a bit obsolete) or Debian's official documentation on BurnCD.
 

8. What we learned here


Though the accent of this tutorial was how to Create Audio Music CD from MP3 on GNU / Linux, the same commands are available in most FreeBSD / NetBSD / OpenBSD ports tree so you can use the same method to build prepare Audio Music CD on *BSDs.

In this article, we went through few basic ways on how to prepare WAV files from MP3 normalize the new created WAV files on Linux, to prepare files for creation of Audio Music CD for the old mom or grandma's player or even just for fun to rewind some memories. For GUI users this is easily done with  k3b,  brasero or xfburn.

I've pointed you to cdw a super useful text ncurses tool that makes CD Burninng from plain text console (on servers) without a Xorg / WayLand  GUI installed super easy. It was shortly reviewed what has changed over the last few years and why and why cdrecord was substituted for wodim. A few examples were given on how to handle conversion through bash shell loops and you were pointed to some extra reading resources to learn a bit more on the topic.
There are plenty of custom scripts around for doing the same CD Burn / Covnersion tasks, so pointing me to any external / Shell / Perl scripts is mostly welcome.

Hope this learned you something new, Enjoy ! 🙂

How to downgrade package with apt-get on Debian / Ubuntu / Mint Linux

Thursday, October 19th, 2017

how-to-downgrade-debian-package-to-an-older-version-debian_package-box

 

How can I downgrade a debian package to an older version with apt-get?

Downgrading a package in Debian is not frequently required but sometimes it is a must lets say a package you just upgraded fails to communicate properly to an application, in my case that's Ejabberd server which was working pretty well with Yaxim, Bruno or Xabber Mobile android application clients, unfortunately right after periodic apt-get upgrades I do with apt due to security upgrade of deb package ejabberd=2.1.10-4+deb7u1 to ejabberd=2.1.10-4+deb7u2 it messed up and even though it worked fine with Desktop clients such as Gajim and Pidgin, there was no Android application on my Phone with Android 4.4 which was able to communicate properly with the TLS encrypted Jabber server so my only option was to downgrade back to ejabberd=2.1.10-4+deb7u1.

I looked through duckduckgo.com a short URL is (ddg.gg) but I couldn't find the old deb file to downgrade so I was in a situation …

 Then I duckduck goed (I've recently stopped using Google as Google is collecting too much data and sharing with NSA) and I found following instructions on downgrade

——— 

If you have the version number, or the target release, apt-get supports choosing a particular version or target release. More details can be found on manual page of apt-get. It can also be accessed from terminal by typing man apt-get

sudo apt-get install <package-name>=<package-version-number> OR

sudo apt-get -t=<target release> install <package-name>

is the command to be run. This can be used to down-grade a package to a specific version.

It has been helpfully pointed out in the comments that

    apt-cache showpkg <package-name> – lists all available versions. (h/t Sparhawk)
    apt-mark hold <package-name> "holds" – the package at the current version, preventing automatic upgrades. (h/t Luís de Sousa )


In other words All I had to do is as root superuser is:
 

apt-get install «pkg»=«version»

OR

aptitude install «pkg»=«version»

Where «pkg» is the name of the package, and «version» is the version number.


So I just issued following cmd:

root@pcfreak:~# apt-get install ejabberd=2.1.10-4+deb7u1
Четене на списъците с пакети… Готово
Изграждане на дървото със зависимости       
Четене на информацията за състоянието… Готово
Предложени пакети:
  libunix-syslog-perl
Следните НОВИ пакети ще бъдат инсталирани:
  ejabberd
0 актуализирани, 1 нови инсталирани, 0 за премахване и 3 без промяна.
Необходимо е да се изтеглят 1795 kB архиви.
След тази операция ще бъде използвано 3699 kB допълнително дисково пространство.
Изт:1 http://ftp.uk.debian.org/debian/ wheezy/main ejabberd amd64 2.1.10-4+deb7u1 [1795 kB]


P.S. Sorry for the cyrillic for those who can't read it but it is standard messages that Debian does in package install time.

Analogously you can do it for any other newer package that upgraded, later on to prevent further security updates of the package you will have to put the package on hold, that's as easy as running:
 

root@pcfreak:~# aptitude hold ejabberd
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.

 

Skype remove word completion / Howto Disable spellcheck autocorrect on Mac OS X, Android Phones Tablets and IPhone iOS

Tuesday, March 14th, 2017

How-to-disable-auto-correct-on-MacOS-X-android-and-iphone

I've recently upgraded my wife's Mac Book Air Mac OS X release from Mountain Lion to latest available OS X release Yosemite and after upgrade the old version of Skype used for about 3 years without any problems (except camera issues due to mac OS X bug the old post is here) stopped working (did crashed) on Skype launch so I took few minutes to upgrade Skype as well from Skype.com Skype for Mac official download page after the quick and unproblematic Skype re-install, Skype client was back to normal with a shiny new outlook and on a first glimpse all worked like a charm but …

On the next day when I took use of temporary the upgraded Mac Book Air with the fresh new OS X Yosemite and Skype's latest app to to do a quick login with my Skype credentials noticed a very annoying autocorrect (auto spelling)  Skype behavior on any new input text message.

I have to admit the idea of autocorrect feature on a system wide scale is great however quick keyboard typers like me who are used to type more than a letter per second use to type so quickly that occasinally you do errors which you're quick to fix but anyhow errors are automatically corrected in a way that you have to retype the whole word quite often which makes your typing a hellish experience. Then the same auto-correct feature becomes a terrible experience and on any device I notice this behavior I tend to remove it immediately.

I remember  the same dictionary auto-spell check / corect behavior was present on my Android run ZTE blade 3 mobile after first Mobile boot and also present on my current iPhone 5 iOS and thus the first thing I did once I start using it is to remove autocorrect (auto spelling) feature and relax the irritation of it.

Just in case if you need to disable Spellcheck auto-correct on Android Phone or Tablet do it from

Settings -> Language & input

android-phone-tablet-disable-autocorrect-spell-check

If you happen to be using also IPhone 5 as me or  Iphone 6 / 7 to disable AutoCorrect feature on SMSes / Skype / Viber and other applications do it from Phone's:

Settings -> General

disable_Turn_off_AutoCorrect_in_IPhone_iOS

Shortly I've noticed that the auto-correct feature does not only mess up your typing in Skype but also in Mail and TweetDeck and generally any open application where you can type on Yosemite.


I've took the time to investigate quickly what was causing the new feature that bugged me so much online and came to this nice little article How to turnoff autocorrect on Mac OS X 10.11 El Captain

As the article revealed to Turn off the autocorrect Mac OS X feature you I have to go:

Finder -> System Preferences

 

stop-skype-autocorrect-annoying-macosx-yosemite-system-preferences-menu-screenshot

Click on Keyboard -> Text
and turn  Autocorrect off by unchecking Correct spelling automatically

stop-skype-autocorrect-annoying-macosx-yosemite-system-preferences-keyboard-menu-screenshot

By doing this autocorrect spelling is disabled for all applications, however for some people it might be handy to leave the correct feature for Mail app or Microsoft Office (Microsoft Word / Excel) etc. and only turn off (disable) the autorrect feature per application side.

You can  do this in the separate Applications (of choise where you need auto spelling) from  Edit Menu under Spelling and Grammer and enable / disableCheck Spelling While Typing

stop-skype-autocorrect-annoying-macosx-yosemite-spelling-and-grammar-menu-screenshot


Tadam Enjoy ! 🙂

 

How to mount NFS network filesystem to remote server via /etc/fstab on Linux

Friday, January 29th, 2016

mount-nfs-in-linux-via--etc-fstab-howto-mount-remote-partitions-from-application-server-to-storage-server
If you have a server topology part of a project where 3 (A, B, C) servers need to be used to deliver a service (one with application server such as Jboss / Tomcat / Apache, second just as a Storage Server holding a dozens of LVM-ed SSD hard drives and an Oracle database backend to provide data about the project) and you need to access server A (application server) to server B (the Storage "monster") one common solution is to use NFS (Network FileSystem) Mount. 
NFS mount is considered already a bit of obsoleted technology as it is generally considered unsecre, however if SSHFS mount is not required due to initial design decision or because both servers A and B are staying in a serious firewalled (DMZ) dedicated networ then NTS should be a good choice.
Of course to use NFS mount should always be a carefully selected Environment Architect decision so remote NFS mount, imply  that both servers are connected via a high-speed gigabyte network, e.g. network performance is calculated to be enough for application A <-> to network storage B two sides communication not to cause delays for systems end Users.

To test whether the NFS server B mount is possible on the application server A, type something like:

 

mount -t nfs -o soft,timeo=900,retrans=3,vers=3, proto=tcp remotenfsserver-host:/home/nfs-mount-data /mnt/nfs-mount-point


If the mount is fine to make the mount permanent on application server host A (in case of server reboot), add to /etc/fstab end of file, following:

1.2.3.4:/application/local-application-dir-to-mount /application/remote-application-dir-to-mount nfs   rw,bg,nolock,vers=3,tcp,timeo=600,rsize=32768,wsize=32768,hard,intr 1 2


If the NTFS server has a hostname you can also type hostname instead of above example sample IP 1.2.3.4, this is however not recommended as this might cause in case of DNS or Domain problems.
If you want to mount with hostname (in case if storage server IP is being commonly changed due to auto-selection from a DHCP server):

server-hostA:/application/local-application-dir-to-mount /application/remote-application-dir-to-mount nfs   rw,bg,nolock,vers=3,tcp,timeo=600,rsize=32768,wsize=32768,hard,intr 1 2

In above example you need to have the /application/local-application-dir-to-mount (dir where remote NFS folder will be mounted on server A) as well as the /application/remote-application-dir-to-mount
Also on server Storage B server, you have to have running NFS server with firewall accessibility from server A working.

The timeou=600 (is defined in) order to make the timeout for remote NFS accessibility 1 hour in order to escape mount failures if there is some minutes network failure between server A and server B, the rsize and wsize
should be fine tuned according to the files that are being red from remote NFS server and the network speed between the two in the example are due to environment architecture (e.g. to reflect the type of files that are being transferred by the 2)
and the remote NFS server running version and the Linux kernel versions, these settings are for Linux kernel branch 2.6.18.x which as of time of writting this article is obsolete, so if you want to use the settings check for your kernel version and
NTFS and google and experiment.

Anyways, if you're not sure about wsize and and rise, its perfectly safe to omit these 2 values if you're not familiar to it.

To finally check the NFS mount is fine,  grep it:

 

# mount|grep -i nfs
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
server-hostA:/application/remote-application-dir-to-mount on /application/remote-application-dir-to-mount type nfs (rw,bg,nolock,nfsvers=3,tcp,timeo=600,rsize=32768,wsize=32768,hard,intr,addr=1.2.3.4)


That's all enjoy 🙂

 

 

Increase tomcat MaxThreads values to resolve Tomcat timeout issues and sort

Friday, December 11th, 2015

Increase_Tomcat_MaxThreads_values_to_resolve_Tomcat_timeout-issues-and-sort

Thanks God, we have just completed (6 months) Migration few Tomcat and TomEE application servers for PG / PP and Scorpion instances from old environment to a new one for a customer.

Though the separate instances of the old environment are being migrated, the overall design of the Current Mode of Operations (CMO) as they use to call it in corporate World and the Future Mode of Operations (FMO) has differences.

The each of applications on old environment is configured to run in Tomcat failover cluster (2 tomcats on 2 separate machines with unique IP addresses are running) and Apache Reverse Proxy is being used with BalanceMember apache directive in order to drop requests to Tomcat cluster to Tomcat node1 and node2. On the new environment however by design the Tomcat cluster is removed and the application request has to be served by single Tomcat instance.

The migration completed fine and in the beginning in the first day (day 1) and day 2 since the environment went in Production and went through the so-called "GoLive", as called in Corporate World- which is a meathor for launching the application to be used as a production environment for customer, the customer reported TimeOut issues.

Some of the requests according to their report would took up to 4 minutes to serve, after a bit of investigation we found out, that though the environment was moved to one Tomcat the (number) amount of connections to application of end clients did not change, thus the timeouts were caused by default MaxThreads being reached and, we needed to to obviously raise that number. Here is the old Apache RP config where we had the 2 Tomcats between which the RP was load balancing:
 

BalancerMember ajp://10.10.10.5:11010 route=node1 connectiontimeout=10 ttl=60 retry=60
BalancerMember ajp://10.10.10.5:11010 route=node2 connectiontimeout=10 ttl=60 retry=60

ProxyPass / balancer://pool/ stickysession=JSESSIONID
ProxyPassReverse / balancer://pool/


As we needed a work around, we come to conclusion that we just need to increase Timeout on RP first so on Apache Reverse Proxy we placed following httpd.conf Virtualhost ProxyPass (directive) configs :

 

ProxyPass / ajp://10.10.10.5:11010/ keepalive=On timeout=30 connectiontimeout=30 retry=20
ProxyPassReverse / ajp://10.10.10.5:11010/

ProxyPass / ajp://10.10.10.5:11010/ keepalive=On timeout=30 connectiontimeout=30 retry=20
ProxyPassReverse / ajp://10.10.10.5:11010/


and following Apache Timeout directives options:

 

Timeout 300
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 15


Even though the developer tried to insist that the problem was in Reverse Proxy timeout config, they were wrong as I checked the RP logs and there was no "maximum connections reached" errors..

As you could guess what left to check was only Tomcat, after quick evaluation of server.xml, it turned out that the MaxThreads directive on old clustered Tomcats was omitted at all, meaning the default MaxThreads Tomcat value of 200 maximum connections were used, however this was not enough as the client was quering the application with about 350 connections / sec.

The solution was of course to raise the Maxthreads to 400 we were pretty lucky that we already had a good dedicated Linux machine where the application was hosted (16GB Ram, 2 CPUs x 2.67 Ghz), thus raising MaxThreads to 400 was not such a big deal.

Here is the final config we used to fix tomcat timeouts:
 

<Connector port="11010" address="10.10.10.80" protocol="AJP/1.3" redirectPort="8443" MaxThreads="400" connectionTimeout="300000" keepAliveTimeout="300000" debug="9" />


One note to make here is the debug="9" options to Connector directive was used to increase debug loglevel of Tomcat, and address="" is the local network IP on which Tomcat instance runs. As you see, we choose to use very high connectionTimeouts (because it is crucial, not to cut requests to applications due to timeouts) in case of application slowness.

We also suspected that there are some Oracle (ORA) database queries slowly served on the SQL backend, that might in future cause more app slowness, but this has to be checked seperately further in time as presently we were checking we did not have our Db person present.

 

Заповеди Блаженства (на Церковнослаянском языке, На Български and in English)

Tuesday, November 10th, 2015

Заповеди Блаженства (ТК Союз)

 

На церковнославянском языке по Мф 5, 3-11 

  1. Блажени нищии духом, яко тех есть Царствие Небесное
  2. Блажени плачущии, яко тии утешатся
  3. Блажени кротцыи, яко тии наследят землю
  4. Блажени алчущии и жаждущии правды, яко тии насытятся
  5. Блажени милостивии, яко тии помиловани будут
  6. Блажени чистии сердцем, яко тии Бога узрят
  7. Блажени миротворцы, яко тии сынове Божии нарекутся
  8. Блажени изгнани правды ради, яко тех есть Царствие Небесное
  9. Блажени есте, егда поносят вам, и ижденут, и рекут всяк зол глагол на вы лжуще, Мене ради: Радуйтеся и веселитеся, яко мзда ваша многа на небесех: тако бо изгнаша пророки, иже (беша) прежде вас.

Евангелски блаженства (Български)

  1. Блажени бедните духом, защото тяхно е Царството небесно.
  2. Блажени плачещите, защото те ще се утешат.
  3. Блажени кротките, защото те ще наследят земята.
  4. Блажени гладните и жадните за правда, защото те ще се наситят.
  5. Блажени милостивите, защото те ще бъдет помилвани.
  6. Блажени чистите по сърце, защото те ще видят Бога.
  7. Блажени миротворците, защото те ще се нарекат синове Божии.
  8. Блажени изгонените заради правда, защото тяхно е Царството небесно.
  9. Блажени сте вие, когато ви похулят и изгонят, и кажат против вас лъжовно каква и да е лоша дума заради Мене. Радвайте се и веселете се, защото голяма е наградата ви на небесата.

— Библията, Евангелие от Матей 5 глава 3-12 стих

The Beautitudes – The Sermon on the Mount (English)

Blessed are the poor in spirit: for theirs is the kingdom of Heaven. (5:3)

Blessed are those who mourn: for they will be comforted. (5:4)

Blessed are the meek: for they will inherit the earth. (5:5)

Blessed are those who hunger and thirst for righteousness: for they will be filled. (5:6)

Blessed are the merciful: for they will be shown mercy. (5:7)

Blessed are the pure in heart: for they will see God. (5:8)

Blessed are the peacemakers: for they will be called children of God. (5:9)

Blessed are those who are persecuted for righteousness sake: for theirs is the kingdom of heaven. (5:10)

In verses 5:11-12, the eight Beatitudes are followed by what is often viewed as a commentary—a further clarification of the eighth one with specific application being made to the disciples. Instead of using the third-person plural "they", Jesus changes to second-person "you":[1]

Blessed are you when people insult you, persecute you and falsely say all kinds of evil against you because of me. Rejoice and be glad, because great is your reward in heaven, for in the same way they persecuted the prophets who were before you.

Windows XP / 7, Minimize any program to system tray free software – RBTray, Trayconizer and Windows HideIT

Monday, January 5th, 2015

rbtray-screenshot1-on-ms-windows-minimize-any-application-systray-winblows
As Linux admin, I'm already aware of AllTray *NIX application able to send any application to GNOME / KDE tray.
But what If you have a program on Windows XP / 7 / 8,  that doesn't have a minimize to tray functionality and you want to send it to tray?
I.e. what if you want to send programs like Notepad (that doesn't by default go to win systray) to Windows  tray in order to prevent them mess up with other Open Windows minimized windows?

After a quick research on the topic I found these 3 – RBtray, Trayconizer, HideIt, Below is a very quick review on each

.

1. Minimize any Windows program to tray with RBTray

rbtray_windows-7-screenshot-minimize-any-application-to-tray-minimize-notepad
If you want to stick to open source (GPL) software a tiny free software proggie that does the trick is RBTray current latest RBtray is 4.3 release is download mirror is here.

To use RBTray you don't need to do anything, once program is unarchived from archive, once launched there will be no system application that it is running, but you can go to any minimized program (not in tray) and by clicking with right mouse button on minimize button you will the app minimize to tray.

Here is how RBTray works (taken from archive README file):

Installing:
Extract the 32-bit or 64-bit binaries (depending on your OS) to a
 folder, e.g.
C:Program FilesRBTray.  Double click RBTray.exe to start it.  If you want it
to automatically start after you reboot, create a shortcut to RBTray.exe in
your Start menu's Startup group.

Using:
Right click on any program's minimize button to minimize it to the tray.  To
restore, single-click the program's icon in the tray.

Exiting:
Right click on any tray icon created by RBTray and click Exit RBTray in the
popup menu.  Or run RBTray.exe with the –exit parameter.


2. Miminize any app to system tray with Trayconizer

trayconizer_screenshot-microsoft-windows-minimize-notepad
Trayconizer is the other tray minizer tool you might want to check out, Windows tray minize application a download mirror of Trayconizer is here. As of time of writing this post (current) latest Trayconizer version is 1.1.1.

Trayconizer allows you to minimize virtually any application to the system tray rather than having it take up valuable space in your taskbar. The screen shot to the left shows Trayconizer minimizing Notepad to the system tray. Trayconizer is definitely the tool of choice of system administrators who need to keep minimized windows program to system tray each time on boot as it can be easily run from command line.

Using Trayconizer is simple. To start Trayconizer on Notepad, you would execute: C:PathToTrayconizer.exe C:WindowsNotepad.exe.

You can create a shortcut in your Startup group to execute Trayconizer on a program that you use frequently but want to keep tucked out of the way in the system tray when you're not using it. There is even an option for starting the application initially in the minimized state.

Trayconizer will automatically shut itself down when you close the program you are Trayconizing. Additionally, multiple Trayconized programs are handled by a single instance of Trayconizer to avoid wasting system resources.

Trayconizer requires no DLL's beyond the base Win32 API libraries and will not store any entries in your registry.

3. Minimize any program to Windows systray with Windows HideIT

windows-hideit-minimize-to-tray-screenshot-send-any-running-windows-program-to-systray

Another good tool useful in hiding (minimizing) Windows programs which are lacking the minimize option embedded built-in is Windows HideIT.

Hideit official download website is here, note that with Hideit, Its pretty confusing to find where to download in (so to download look in the right upper corner for a download button) HideIT Download Mirror is here.

Hideit should be able to minimize any Application to sysytem tray, while Rbtray fails ith some. Both RBtray and Windows
HIdeIT will popup with a blue down-arrow on Tray icon once launched and you can show / hide minimized applications from there.

All RbTray, Trayconizer and HideIt tray minimizers should work on virtually all NT 4.0 Windows XP / 2000 / Vista / 7 / 8 though I haven't tested on all of 'em yet. If you happen to find it working on  Win NT 4.0 / 8 etc., please drop a comment.

How to split / rar in parts large data archive files on Linux and Windows – Transfer big files across servers located in DMZ rescticted areas

Friday, November 28th, 2014

how-to-split-rar-in-parts-large-data-archive-files-on-Linux-and-Windows-Transfer-big-files-across-servers-in-firewalled-restricted-areas

I was working on a Application Migration Project whose goal was to Install a business application called Asset Guardian and then move current company Data from the old server to the new AppServer.
F
or that purpose the company vendor Asset Guardian shipped to a Public access FTP, a huge (12GB) ZIP archive file which had to be transferred into a well secured DMZ-ed corporation network with various implemented Traffic Shaping Network policies, a resctrictive firewall allowing access to Internal Network only and to Few (Restrictive configured) Proxy Server IPs on port 80 and 8080.

One of the proxy servers allowed access to the Internet and I set this one and tried downloading the Huge Archive file  with the Windows 2012 server default browser Internet Explorer 10, though the download started it kept slow between ~ 300 – 500KB sec and when reached 3.4GB download failed. I tried resuming the download but as the remote Public FTP server where files resides doesn't support FTP RESUME function.
I thought it might be that Internet Explorer is badly managing the download so, I go forward and installed Portable Firefox (mirrored version 33.1.1 is here). Re-running download with firefox also failed, so the next logical step was for me to try downloading with Windows version of Wget (Wget) and with Portable Free Download Manager 3.9.14.1481 (mirrored here) using both of them was unable to complete download (probably due to firewall or Proxy screwing the proxy inspected traffic) thus I had to look for another way to copy the enormous archive into the company network.

To get around the issue I tried to download the file from FTP to another Server running Apache and tried re-downloading the big file archive (Asset-Guardian-data.zip) from Apache Webserver via HTTP protocol, this download method didn't work neither using plain HTTP protocol for download when downloaded file reached (3.4GB), thus I realized this is due to restrictive Proxy servers (dropping file downloads) bigger than  3.4GBs).

Then to be able to transfer the huge 12GB file, it seems the only left option was to to chop the big file on smaller file chunks and transfer them one by one.
In my case I had the Asset-Guardian-Files.zip transferred already to the Apache (Webserver) host which is running Linux so basicly the task was to Transfer Big archive file between the SuSE Linux Enterprise Server (SLES) 11 and Windows 2012 Server.

Quickesy way to do that is by using UNIX split command, i.e.:

split -b 1024m Asset-Guardian-Files.zip


The outputted files each 1GB are with naming (xaa, xab, xac, xad, xae, xaf, gaf etc.) in same folder where split command is run:

To later merge the files on the Windows 2012 server (copy) command is used:

copy /b file1 + file2 + file3 + file4 filetogether


In my case the command to issue on Win 2012 server was:

copy /b xaa + xab + xac + xae + xae + xaf + xaf + xag xah xai xaj xak Asset-Guardian-files.zip


This method to chop and transfer the file is most simple one and it doesn't require the two servers to have WinRAR or Console RAR / unrar installed.

If instead of Copy Huge File from Linux -> Windows host you need to copy too big file (lets say 100GB) between 2 Windows servers (Windows server host A and Windows server Host B – both situated in different firewall corporate networks) you will need to download to Win Host A and use Windows UNIX split equivalent tool called sfk (The Swiss File Knife) , sfk has port also for Mac OS so in case of need for need for migrating huge archive file from Mac OS X host it will serve as Linux's split – I've made SFK (current version) mirror here.

Another way to cut the 12GB file in parts and transfer to destination host via HTTP was to use rar (on the Linux host), then download the file on Win 2012 server and use Winrar Portable Free to extract the multiple files:

To make archive separate in parts set out to certain size out of a huge file with rar on Linux use:

cd /var/www
rar -a -v1000000k Asset_Guardian_Files.splitted.rar /var/www/Asset_Guardian_Files.zip

10000000Kbs = 10000000/1024 = 976MBs, hence rar produced parts will be sized to 976MB rar parts.

To find out archives check for *splitted*.rar in your /var/www

ls -al /var/www/*splitted*.rar
-rw-r–r– 1 root root 1048576 ное 28 18:34 Asset-Guardian-Files.splitted.part1.rar
-rw-r–r– 1 root root 1048576 ное 28 18:34 Asset-Guardian-Files.splitted.part2.rar
-rw-r–r– 1 root root 1048576 ное 28 18:34 Asset-Guardian-Files.splitted.part3.rar
-rw-r–r– 1 root root 1048576 ное 28 18:34 Asset-Guaridna-Filse.splitted.part4.rar

 

Then to download the files M$ Win 2012 server IE (http://my-linux-host.com/Asset-Guardian-Files.splitted.part1.rar, http://my-linux-host.com/Asset-Guardian-Files.splitted.part2.rar. etc.)

Thanks God, Problem Solved 🙂

xkill for Windows – Kill hanged programs with one click like in UNIX

Thursday, September 18th, 2014

Windows Xkill by Solo Dev logo kill easily hanged, crashed windows programs - Linux xkill for Windows alternative

I’ve used Linux as I’ve used it over the last 10 years and thus I’m so used to xkill that I consider it as a normal tool every modern operating system should have.

Since I’m forced to work on a Windows platform over the last 1 year, every now and then I have crashing / hanged apps Window which sometimes is hard to kill using Task Manager or command line tools like tasklist, taskkill or pstools – Windows Sysinternal tools cause you don’t know the exact process name of the Windows crashed application.

Thanksfully a good hearted guy SuprVillain made Windows Xkill program. Windows Xkill is portable app, so you don’t need to install it but simply download and run it.

windows-7-system-tray-xkill-screenshot-xkill-for-windows

Win-Xkill runs in system tray and has “kill mode” of operation, when Kill mode it is running Windowns Xkill operates exactly like UNIX’s xkill. The mouse pointer turns into Skull and Cross Bones, you point at a Window app you wanted to kill and it gets terminated.
Windows Xkill kill mode enabled killing a windows notepad app
Win Xkill kill mode, can be invoked using also a key press Control+Alt+Backspace as well as there is an option to leave xkill running in the background background, but disabling the tiny skull icon in systray from its interface.
Enjoy 🙂