ssmtp mail server setup and configuration

Posted on June 20, 2015 by coder

Install ssmtp Install ssmtp: sudo apt-get install ssmtp

Edit the ssmtp config file : gksu gedit /etc/ssmtp/ssmtp.conf

Enter this in the file:

root=username@kutayzorlu.com
mailhub=smtp.kutayzorlu.com:465
rewriteDomain=kutayzorlu.com
AuthUser=username
AuthPass=password
FromLineOverride=YES
UseTLS=YES

root=username@kutayzorlu.com

mailhub=smtp.kutayzorlu.com:465

rewriteDomain=kutayzorlu.com

AuthUser=username

AuthPass=password

FromLineOverride=YES

UseTLS=YES

#!!! Do not use STARTTLS and TLS in the same time, You cant use both of them in the same time.

Enter the email address of the person who will receive your email:

ssmtp recepient_name@kutayzorlu.com
Now enter this:

To: recipient_name@kutayzorlu.com
From: username@kutayzorlu.com

ssmtp recepient_name@kutayzorlu.com

Now enter this:

To: recipient_name@kutayzorlu.com

From: username@kutayzorlu.com

Subject: Sent from a terminal!

Your content goes here. Lorem ipsum dolor sit amet, consectetur adipisicing.

To send the email: Ctrl + D

You can also save the text mentioned in Point 5 into a text file and send it using:

ssmtp recipient_name@gmail.com < filename.txt

Linux install E-mail server and make test

Posted on June 20, 2015June 20, 2015 by coder

apt-get install mail-utils

1	apt-get install mail-utils

Create a virtual domain, and a virtual user inside that domain

Do a telnet to the port 25 of your server and send a mail to that domain and see if it’s delivered. You can check the error logs through tail -f /var/log/mail.log -f from a different console. Using telnet is easy

telnet kutayzorlu.com 25
  helo kutayzorlu.com
  mail from: <test@kutayzorlu.com>
  rcpt to: <youruser@kutayzorlu.com>
  data

  Type any content that you want, press enter, then put a period (.) and then enter to exit
  .

telnet kutayzorlu.com 25

helo kutayzorlu.com

mail from: <test@kutayzorlu.com>

rcpt to: <youruser@kutayzorlu.com>

data

Type any content that you want, press enter, then put a period (.) and then enter to exit

Command line send mail

Now login into the server via ssh, and use mail command to send out the email

$ echo "Test Email from kutayzorlu server" | mail -s "Test Subject" youruser@kutayzorlu.com

Now login into the server via ssh, and use mail command to send out the email

$ echo "Test Email from kutayzorlu server" | mail -s "Test Subject" youruser@kutayzorlu.com

Postfix configuration

mynetworks line in postfix/main.cf

1	mynetworks line in postfix/main.cf

Apache Tomcat Performance optimization

Posted on June 20, 2015June 20, 2015 by coder

1- Memory problems

# Find the catalina.sh   file, 
export CATALINA_OPTS="-Xms256m -Xmx256m"
#change 256 to 128  or what every you want

# Find the catalina.sh file,

export CATALINA_OPTS="-Xms256m -Xmx256m"

#change 256 to 128 or what every you want

The Heap: This is the memory used to store your objects and is controlled by the -Xms and -Xmx parameters.

The Stack: This is the memory used to store the stack frames for the threads that your program maintains and can be controlled with the -Xss parameter.

Permgen Memory: This is the memory used to store your compiled classes and pooled strings as well as some other things and can usually be controlled with -XX:MaxPermSize although the -XX represents a debugging parameter, so there's no guarantee it's on all JVM's. But, the default Sun/Oracle reference implementations have always had them.

JNI Allocated Memory Any classes utilizing native methods and JNI could potentially allocate unlimited memory. This memory comes from the OS and not the heap and there's no way of knowing how much memory a native class will use without having access to the source.

The Heap: This is the memory used to store your objects and is controlled by the -Xms and -Xmx parameters.

The Stack: This is the memory used to store the stack frames for the threads that your program maintains and can be controlled with the -Xss parameter.

Permgen Memory: This is the memory used to store your compiled classes and pooled strings as well as some other things and can usually be controlled with -XX:MaxPermSize although the -XX represents a debugging parameter, so there's no guarantee it's on all JVM's. But, the default Sun/Oracle reference implementations have always had them.

JNI Allocated Memory Any classes utilizing native methods and JNI could potentially allocate unlimited memory. This memory comes from the OS and not the heap and there's no way of knowing how much memory a native class will use without having access to the source.

2- CPU ( For number of Threads, server.xml)

1- Limit the number of Java threads.

2- Limit the maximum Java heap size.

1- Limit the number of Java threads.

2- Limit the maximum Java heap size.

Example

<Connector port="8080" address="localhost"     
     minSpareThreads="20" />

1 2	<Connector port="8080" address="localhost" minSpareThreads="20" />

get user courses via php, $ DB-> list _ categories

Posted on June 17, 2015July 19, 2015 by coder

<?php
$mycourses = get_my_courses($USER->id);
$catArr = array();

foreach ($mycourses as $mycourse){
array_push($catArr,$mycourse->category);
}

$catArr = array_unique($catArr);

sort($catArr);

foreach ($catArr as $cat){
$myCat = get_records_select('course_categories',"id='$cat'",'name ASC','id, name');
foreach ($myCat as $mCat){
echo '<h4>'.$mCat->name.'</h4>';
}
echo '<ul>';
foreach ($mycourses as $mycourse){
if ($mycourse->category == $cat){
echo '<li><a href="../course/view.php?id='.$mycourse->id.'">'.$mycourse->fullname.'</a></li>';
}
}
echo '</ul>';
}
?>

<?php

$mycourses = get_my_courses($USER->id);

$catArr = array();

foreach ($mycourses as $mycourse){

array_push($catArr,$mycourse->category);

}

$catArr = array_unique($catArr);

sort($catArr);

foreach ($catArr as $cat){

$myCat = get_records_select('course_categories',"id='$cat'",'name ASC','id, name');

foreach ($myCat as $mCat){

echo '<h4>'.$mCat->name.'</h4>';

}

echo '<ul>';

foreach ($mycourses as $mycourse){

if ($mycourse->category == $cat){

echo '<li><a href="../course/view.php?id='.$mycourse->id.'">'.$mycourse->fullname.'</a></li>';

}

echo '</ul>';

}

Custom errors in ASP.net MVC

Posted on June 14, 2015 by coder

To enable custom errors in ASP.NET MVC application we need (IIS 7+):

Configure custom pages in web config under system.web section:

<customErrors mode="RemoteOnly"  defaultRedirect="~/error">
    <error statusCode="404" redirect="~/error/kutayzorlu404" />
    <error statusCode="500" redirect="~/error" />
</customErrors>


	HttpContext.Current.Response.StatusCode = 500;
  	HttpContext.Current.Response.TrySkipIisCustomErrors = true;


<httpErrors errorMode="Detailed" />

To enable custom errors in ASP.NET MVC application we need (IIS 7+):

Configure custom pages in web config under system.web section:

</customErrors>

HttpContext.Current.Response.StatusCode = 500;

HttpContext.Current.Response.TrySkipIisCustomErrors = true;

Linux Kernel Module Programming Guide

Posted on June 12, 2015June 12, 2015 by coder

Using /proc For Input,

Talking To Device Files,

System Calls,

Blocking Processes,

Replacing Printks,

Character Device Files,

Preliminaries,

Scheduling Tasks,

Symmetric Multi Processing,

Common Pitfalls

Please Download file from here : CLICK >> lkmpg_kutayzorlu

Foreword…………………………………………………………………………………………………………………………………………..1 1. Authorship………………………………………………………………………………………………………………………….1 2. Versioning and Notes……………………………………………………………………………………………………………1 3. Acknowledgements………………………………………………………………………………………………………………1 Chapter 1. Introduction……………………………………………………………………………………………………………………..2 1.1. What Is A Kernel Module?…………………………………………………………………………………………………2 1.2. How Do Modules Get Into The Kernel?……………………………………………………………………………….2 1.2.1. Before We Begin………………………………………………………………………………………………………3 Chapter 2. Hello World……………………………………………………………………………………………………………………..5 2.1. Hello, World (part 1): The Simplest Module…………………………………………………………………………5 2.1.1. Introducing printk()…………………………………………………………………………………………………..6 2.2. Compiling Kernel Modules………………………………………………………………………………………………..6 2.3. Hello World (part 2)…………………………………………………………………………………………………………..7 2.4. Hello World (part 3): The __init and __exit Macros………………………………………………………………8 2.5. Hello World (part 4): Licensing and Module Documentation………………………………………………….9 2.6. Passing Command Line Arguments to a Module…………………………………………………………………11 2.7. Modules Spanning Multiple Files………………………………………………………………………………………13 2.8. Building modules for a precompiled kernel…………………………………………………………………………15 Chapter 3. Preliminaries………………………………………………………………………………………………………………….17 3.1. Modules vs Programs……………………………………………………………………………………………………….17 3.1.1. How modules begin and end…………………………………………………………………………………….17 3.1.2. Functions available to modules…………………………………………………………………………………17 3.1.3. User Space vs Kernel Space……………………………………………………………………………………..18 3.1.4. Name Space……………………………………………………………………………………………………………18 3.1.5. Code space……………………………………………………………………………………………………………..19 3.1.6. Device Drivers………………………………………………………………………………………………………..19 Chapter 4. Character Device Files……………………………………………………………………………………………………21 4.1. Character Device Drivers………………………………………………………………………………………………….21 4.1.1. The file_operations Structure……………………………………………………………………………………21 4.1.2. The file structure…………………………………………………………………………………………………….22 4.1.3. Registering A Device………………………………………………………………………………………………22 4.1.4. Unregistering A Device……………………………………………………………………………………………23 4.1.5. chardev.c………………………………………………………………………………………………………………..23 4.1.6. Writing Modules for Multiple Kernel Versions…………………………………………………………..26 Chapter 5. The /proc File System……………………………………………………………………………………………………..28 5.1. The /proc File System………………………………………………………………………………………………………28 5.2. Read and Write a /proc File………………………………………………………………………………………………30 5.3. Manage /proc file with standard filesystem…………………………………………………………………………33 5.4. Manage /proc file with seq_file…………………………………………………………………………………………37 Chapter 6. Using /proc For Input……………………………………………………………………………………………………..40 6.1. TODO: Write a chapter about sysfs……………………………………………………………………………………40 The Linux Kernel Module Programming Guide i Table of Contents Chapter 7. Talking To Device Files…………………………………………………………………………………………………..41 7.1. Talking to Device Files (writes and IOCTLs)……………………………………………………………………..41 Chapter 8. System Calls…………………………………………………………………………………………………………………..50 8.1. System Calls…………………………………………………………………………………………………………………..50 Chapter 9. Blocking Processes………………………………………………………………………………………………………….55 9.1. Blocking Processes………………………………………………………………………………………………………….55 Chapter 10. Replacing Printks………………………………………………………………………………………………………….63 10.1. Replacing printk…………………………………………………………………………………………………………….63 10.2. Flashing keyboard LEDs…………………………………………………………………………………………………65 Chapter 11. Scheduling Tasks………………………………………………………………………………………………………….68 11.1. Scheduling Tasks…………………………………………………………………………………………………………..68 Chapter 12. Interrupt Handlers……………………………………………………………………………………………………….72 12.1. Interrupt Handlers………………………………………………………………………………………………………….72 12.1.1. Interrupt Handlers………………………………………………………………………………………………….72 12.1.2. Keyboards on the Intel Architecture………………………………………………………………………..72 Chapter 13. Symmetric Multi Processing………………………………………………………………………………………….76 13.1. Symmetrical Multi−Processing………………………………………………………………………………………..76 Chapter 14. Common Pitfalls……………………………………………………………………………………………………………77 14.1. Common Pitfalls……………………………………………………………………………………………………………77 Appendix A. Changes: 2.0 To 2.2……………………………………………………………………………………………………..78 A.1. Changes between 2.4 and 2.6……………………………………………………………………………………………78 A.1.1. Changes between 2.4 and 2.6…………………………………………………………………………………..78 Appendix B. Where To Go From Here……………………………………………………………………………………………..79 B.1. Where From Here?………………………………………………………………………………………………………….79

Creating Postbox in Exchange server 2013

Posted on June 8, 2015October 8, 2015 by coder

– Add User

Alias: Email Domain name @xxxxx.xx

Username : Email account username

Email – Policy : Automatically added by server which address is primary.

* We should change policy rule after adding, Permissions also need to be change.

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