ld.so.1: mongo: fatal: libstdc++.so.6: open failed: No such file or directory

To fix this issue make sure you download the extra libraries so you don’t get any dependency issues.
Assuming I have installed mongodb in /home/bach/mongo

$ cd /home/bach/mongo/
$ curl -O http://downloads.mongodb.org.s3.amazonaws.com/sunos5/mongo-extra-64.tgz
$ tar -xvzf mongo-extra-64.tgz
$ rm mongo-extra-64.tgz

Then export the path to the library before launching the shell:

$ export LD_LIBRARY_PATH=/home/bach/mongo/mongo-extra-64

Then you will be able to launch the shell without issues:

$ bin/mongo
> db.foo.save( { a : 1 } )
> db.foo.find()

On myserver, I have a Java app myapp running off Tomcat that I can access on port 8080
http://myserver.com:8080/myapp/

I wanted to serve that app through Apache so I can access it at
http://myapp.myserver.com/

The Solution

So I needed to setup the Apache Tomcat Connector for myserver
a Linux box running CentOS release 5.3

1. To get started go to the docs
   http://tomcat.apache.org/connectors-doc/

2. under headlines, click on the link that says
   “Download the binaries for selected platforms”

   It is recommended to use the binary version if one is available. If the binary is not available, follow the instructions for building mod_jk from source.
   To download mod_jk source select one of the mirrors here.

3. Download the appropriate connector for your platform. For me that was:
   http://apache.mirror.aussiehq.net.au/tomcat/tomcat-connectors/jk/binaries/linux/jk-1.2.28/i586/mod_jk-1.2.28-httpd-2.2.X.so
   

4. rename the connector file
   from:

   mod_jk-1.2.28-httpd-2.2.X.so

   to:

   mod_jk.so

5. and place the file in your Apache’s modules directory
   in my case, the modules directory is at

   /usr/lib/httpd/modules/

6. Now make the below changes to httpd.conf file
   my conf file is at

   /etc/httpd/conf/httpd.conf

   Add this line at the end of your httpd.conf after replacing $TOMCAT_HOME with the correct path for your Tomcat installation:

   Include $TOMCAT_HOME/conf/auto/mod_jk.conf

   for me that line looks like:

   Include /usr/share/tomcat5/conf/jk/mod_jk.conf

7. create mod_jk.conf file at:

   /usr/share/tomcat5/conf/jk/mod_jk.conf

8. and add this code to it:

   <IfModule !mod_jk.c>
     LoadModule jk_module "/usr/lib/httpd/modules/mod_jk.so"
   </IfModule>
    
   JkWorkersFile "/usr/share/tomcat5/conf/jk/workers.properties"
   JkLogFile "/usr/share/tomcat5/logs/mod_jk.log"
    
   JkLogLevel debug
    
   <VirtualHost *:80>
      ServerName myapp.myserver.com
      DocumentRoot "/usr/share/tomcat5/webapps/myapp"
      <Directory "/usr/share/tomcat5/webapps/myapp">
        Options None
        AllowOverride None
        Order allow,deny
        allow from all
      </Directory>
      ErrorLog logs/app1-error.log
      JkMount  /GDM/* gdmw
      JkMount  /* gdmw
      JkMount  /GDM gdmw
   </VirtualHost>

   This will tell Apache to use directives in the mod_jk.conf file in the Apache configuration.

9. Create workers.properties file at

   $TOMCAT_HOME/conf/jk/workers.properties

   For me I had to create

   /usr/share/tomcat5/conf/jk/workers.properties

10. add this code to workers.properties:

    worker.list=myappw
    worker.myappw.host=myapp.myserver.com
    worker.myappw.port=8009
    worker.myappw.type=ajp13
    worker.myappw.lbfactor=1

11. Add the listener to the Engine element in the server.xml in your Tomcat:

    /usr/share/tomcat5/conf/server.xml

    for tomcat 5.x:

    ...
      <Engine ...>
        ...
        <Listener className="org.apache.jk.config.ApacheConfig" modJk="/path/to/mod_jk.so" />
        ...
      </Engine>
      ...

    For me that was:

     <Listener className="org.apache.jk.config.ApacheConfig" modJk="/usr/lib/httpd/modules/mod_jk.so" />

12. Then restart Tomcat.

13. Restart httpd (Apache web server).

14. Done!!

Conclusion

So what’s a ‘worker’?

A Tomcat worker is a Tomcat instance that is waiting to execute servlets or any other content on behalf of some web server.

Now each time Apache receives a request at http://myapp.myserver.com/*
Apache forwards the servlet requests to the worker called “myappw” running in the background.

So now you can access that servlet by going to
http://myapp.myserver.com/

instead of
http://myserver.com:8080/myapp/

Sophisticated open-source Object-Relational DBMS supporting almost all SQL constructs, including subselects, transactions, and user-defined types etc…

The Problem

You have just installed PostgrelSQL but getting this error when you try to run the server:

The ordinal 284 could not be located in the dynamic link library SSLEAY32.dll

1. You have generated your rails app

   rails myApp -d postgresql

2. You try to run the server

   ruby script/server

3. You add your DB details in config/database.yml and you notice this note.

   On Windows:

   #   gem install ruby-postgres
   #       Choose the win32 build.
   #       Install PostgreSQL and put its /bin directory on your path.

4. Install that gem

   gem install ruby-postgres

   * I didn’t get prompted to choose the win32 build but it all installs well.

From now on, to cut this short, few of the errors that you might encounter:

Please install the postgres adapter: 'gem install activerecord-postgres-adapter'

if you try to install that gem you will get this Error

ERROR:  could not find activerecord-postgres-adapter locally or in a repository

So try to install this gem instead “ruby-postgres” like i mentioned before.

Another prompt you might get is when trying to run the server:

The ordinal 284 could not be located in the dynamic link library SSLEAY32.dll

The Solution

1. Copy both “ssleay32.dll” and “libeay32.dll” from Postgresql bin directory. On my machine that’s:

   C:\Program Files\PostgreSQL\8.4\bin

2. and put them in Ruby’s bind directory. On my machine that’s:

   C:\Ruby\bin

* It seems those files were already in Ruby’s bin folder, so overwrite the ones there.

3. And it works!

You run:

gem install mysql

and to your shock you get:

ERROR:  Error installing mysql:
ERROR: Failed to build gem native extension.

And in your log you see:

no such file to load -- mysql

Before you do anything, make sure you download the “developer package” from XAMPP website.

Then in your terminal run this command:

sudo env ARCHFLAGS="-arch i386" gem install mysql -- --with-mysql-dir=/Applications/XAMPP/xamppfiles/lib/mysql --with-mysql-lib=/Applications/XAMPP/xamppfiles/lib/mysql/ --with-mysql-include=/Applications/XAMPP/xamppfiles/include/mysql/

And finally, it worked!

Everything should be made as simple as possible, but not simpler.

Exporting data to Excel files from a database can be done in so many different ways, using so many libraries and classes such as PEAR’s Spreadsheet_Excel_Writer

But here comes the easiest and simplest alternative if you are too busy to read too much instructions, or can’t install any modules or libraries to PHP on your host.

Large code snippets are great, but to save you some copying and pasting just download the source.

In the sample code, my model is called “Myview”, although not included in the zip as it can be any model you want, nothing goes in there.
You will also find the controller, layouts and views related.

All you need to is call that export_xls() method in myview_controller.php

All it does is:
- fetch your data with find(’all’)
- Renders the layout called “export_xls.ctp” in view/layouts
- Renders the view called “export_xls.ctp” in view/myview

REMEMBER:
- Excel document grid is a simple html table
- You can stylize and format your table using CSS

That’s it!

jQuery File Tree is a configurable, AJAX file browser plugin for jQuery. You can create a customized, fully-interactive file tree with as little as one line of JavaScript code.

It has a Ruby connector but not a Rails one, so I decided to write a connector that I can use with Rails 2.3.

I will show you in very easy steps how to setup this up.

Download the source code.

Download a demo.

1. Assuming you have your Rails app created and ready. Open the source zip file and copy both ‘app’ and ‘public’ folders into your application’s root.




2. Next, in the head tag of your layout, add the javascript libraries needed and the jQuery File Tree CSS file.
   

   <script type="text/javascript" src="javascripts/jquery.js"></script>
   <script type="text/javascript" src="javascripts/jquery.easing.js"></script>
   <script type="text/javascript" src="javascripts/jqueryFileTree.js"></script>
   <link rel="stylesheet" href="stylesheets/jqueryFileTree.css" type="text/css"/>

3. Right under that add this style for the page:

   11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

   <style type="text/css"> body { background-color:#EEEEEE; font-family:Verdana,Arial,Helvetica,sans-serif; font-size:11px; padding:15px; } .demo{ background-color:#FFFFFF; border-color:#BBBBBB #FFFFFF #FFFFFF #BBBBBB; border-style:solid; border-width:1px; height:400px; overflow:scroll; padding:5px; width:200px; } </style>

4. In the body tag, create the div that will carry the File Tree explorer.
   

   38 39

   <h2>jQuery File Tree for Ruby on Rails</h2> <div id="fileTree" class="demo"></div>

5. Now to create our fileTree using jQuery, we add this script in the head tag:

   29 30 31 32 33 34 35

   <script type="text/javascript"> $(document).ready( function() { $('#fileTree').fileTree({ root: '', script: 'jqueryfiletree/content' }, function(file) { alert(file); }); }); </script>

   @ line 31, you will notice we passed root and script variables to the fileTree method.
   
   root = the folder you wish to browse, in this case it is an empty string, to point to our public folder. If you wish to point to the images folder, then you type root:”images/”
   
   script= controller/method




6. Now open config/routes.rb and add this line:

   2	map.resources :jqueryfiletree

7. DONE! Run the server and you will see the File Tree browser.

Note: If you are getting a blank window without seeing the filetree, make sure your database is accessible and that you don’t have any exceptions being thrown by the server in your console!