backend default {
  .host = "127.0.0.1";
  .port = "8000";
}

Now you'll notice that the port here is listed at 8000, this means that Varnish will ask the apache or other web server that you have for information on port 8000. This means however that you will need to update your apache server or web server of choice to listen on port 8000. Once you've completed that, restart your web server to prevent it from taking up the default port 80. Now the final magic. Please note in the below example I have a backslash ( \ ) at the end of the first line, this is to create a double line input.

varnishd -f /usr/local/etc/varnish/default.vcl -s malloc,1G \
-T 127.0.0.1:2000 -a 0.0.0.0:8080

What the above line does is as follows: it starts varnish, and tells it that the configuration file it should use is default.vcl (-f /usr/local/etc/varnish/default.vcl) Now in our case the documentation is wrong, as varnish installed a file for us in /etc/varnish/default.vcl, so this needs to be updated. The second part to this is -s malloc,1G. Malloc means that varnish will be caching to memory and use up 1GB of space. Then there is the -T directive. This specifies where the administration telnet console will listen. You can once issuing the command run telnet localhost 2000 and log into varnish to perform several different tasks which at this point is out of our scope. The final and most confusing attribute to our users is the line that reads -a 0.0.0.0:8080. This line however complicated is completely unnecessary. What it does is to tell varnish to listen on address 0.0.0.0 on port 8080. Due to our web server previously running on port 80 by default we want it to listen on port 80 not 8080, and we want to keep it listening on all interfaces so we can now exclude this entire switch. So finally on our redhat based system with the default vcl file installed under /etc/varnish/default.vcl, and apache already listening on port 8000 all we need to issue is the following, followed by viewing our website provided by our http accelerator...

 varnishd -f /etc/varnish/default.vcl -s malloc,1G -T 127.0.0.1:2000

One last thing before we let you go, if you are running on a 32bit system for whatever reason, it is not recommended to run varnish witth more than 1GB swap. Varnish was designed to run on 64bit systems and performs outstanding, however if you have to run on 32bit it will still work, however if you increase this limit too much then you will run into issues with the stack, as well as 32bit memory limits etc.

We hope you enjoyed this very basic but asked for tutorial

Features : Apache / PHP / MySQL / FTP / SSH / ++

This guide walks you through the entire process of getting a webserver up, however it will only show you how to get a web server up and not to configure your machine for other things, you have to add those yourself. As you boot and start the install you will have to keep track of all the items needed to be installed according to the packages. The development tools is theoreticaly not needed at all for instalation however if you decide to upgrade etc you will need the compilers so it's better to get it done with fast. The guide is seperated into 2 stages the first of wich packages are needed to install and the second as to what to type to get everything working. Here is how the second stage works. Everything typed in RED is actual commands that you give the server. Everything in Blue is things you type in vi ( the text exitor ) and also stuff that should be written in the file specified. Everything in the normal orange color is information and explinations on why you do certain things.

:: = FIRST STAGE = ::

• WWW
• FTP
• SSH
• Allow DHCP if you need it also

Package Selection : [ Package Group Selection ]

Once you click on Editors / Web Server keep all the items under detailed enabled unless otherwise specified below. The sections without : Details means that you can just click the button to enable that section and it is all you need.

Editors > Details > Enable only vim-enhanced.

Web Server > Details > Add : mod_auth_mysql / php-mysql

FTP Server

SQL Database Server Details > Add mysql-server

Development Tools

:: = SECOND STAGE = ::

For everything after this you have to be a super user, so log in as root.

/usr/bin/mysql_install_db
/etc/rc.d/init.d/mysqld start
cd /usr/bin
mysqladmin -u root password 'password'
            

Test MySQL now

/usr/bin/mysql -u root -p

show databases;

It should show you the databases. [ mysql ] and [ test ]

exit

Adding a test to the website now.

cd /var/www/html

vi index.php

This will bring up a text editor, first press i (to initiate insert mode) then type the following.

<?php phpinfo(); ?>

Now hit ESC, then press :wq this will save the file and exit. If you made a mess just hit :qa! to exit

/etc/rc.d/init.d/httpd start

Now check if your website works. It should show the php info. You are nearly complete. Now to add the ability to log in and save files via FTP. SSH will already work, but the majority of people will most likely want to use FTP.

FTP Setup beginning now.

vi /etc/xinetd.d/vsftpd

The file should be /etc/xinetd.d/vsftpd ) Nowhere else, some OS's install a pre-configured version in another directory as an example.

 service ftp{
            disable = no
            socket_type = stream
            wait = no
            user = root
            server = /usr/sbin/vsftpd
        }

 vi /etc/vsftpd/vsftpd.conf

The file should be /etc/vsftpd/vsftpd.conf )

The following commands are not commented out or rather # character before the command for instance #anonymous_enable=NO, it should be without the # Make sure only these commands are in the file nothing more.

            anonymous_enable = NO
            local_enable=YES
            write_enable=YES
            local_umask=022
            dirmessage_enable=YES
            xferlog_enable=YES
            connect_from_port_20=YES
            xferlog_std_format=YES
            pam_service_name=vsftpd
            userlist_enable=YES
            tcp_wrappers=YES
            local_root=/var/www/html
         

The FTP Server is now set up we just have to add a user now to log in.

            groupadd www
            useradd -g www -d /var/www/html ftpuser
            passwd ftpuser
            chown ftpuser:www /var/www/html
            chmod 7777 /var/www/html
            cp /etc/vsftpd/vsftpd.conf /etc/vsftpd.conf
            /etc/rc.d/init.d/xinetd restart
        

Lets test the FTP now.

 ftp localhost

Server will ask you for user and password. Use the ftpuser you just created with it's password once you are logged in do ls (LS) but lower case.

 ls

You should see 2 files 1 being index.php that we created earlier, and other wich is usage that is created by the server when apache was installed. Please note that since you did all the FTP stuff as root you might get problems where your FTP won't let you copy files to a certain folders that you created as root. To fix the error just do

chmod 7777

as root on the particular folder that has the error.

You have completed the setup of your web server, for all the other info you can get via google and the websites of the products youre having problems with.

Now open a browser and see your new apache server running. It should pop up to a page with PHP Version info and a lot of garbage. This means that your PHP is working together with the apache install. This will also indicate that if you did everything I said mysql will be ready to be installed. This whole instalation is for a pretty basic website. All the other changes to httpd.conf etc you can read about on the web and ask others to help. This doc wasn't made to show how to make a production class server but merely to help the struggling new to linux user to get his / her website up quick and easy.

:: Tutorial Created by Nitecon

:: Reason : Many people have hard times getting linux servers up and this tutorial

:: is there so that more people will get into linux instead of having to bother with MS.

:: This tutorial was created after running setups several times to make sure it works.

:: Reinstalled my linux box 11 times and just used those commands and it works

:: I hope this helps and you enjoy it. All I ask is you keep this whole document as is.

:: If someone needs help post the whole thing, please

]]> http://www.nitecon.com/tutorials-articles/develop/linux/web-server-setup-in-rh9/feed/ 0 http://www.nitecon.com/tutorials-articles/develop/cpp/c-mysql-beginner-tutorial/ http://www.nitecon.com/tutorials-articles/develop/cpp/c-mysql-beginner-tutorial/#comments Sun, 13 Feb 2011 15:57:54 +0000 http://nitecon.com/?p=36 This is a very old but still useful tutorial on integrating MySQL with C++

First things first!

#include "my_global.h" // Include this file first to avoid problems
#include "mysql.h" // MySQL Include File
#define SERVER "localhost"
#define USER "username"
#define PASSWORD "password"
#define DATABASE "databasename"
 
int main()
{
    MYSQL *connect; // Create a pointer to the MySQL instance
    connect=mysql_init(NULL); // Initialise the instance
    /* This If is irrelevant and you don't need to show it. I kept it in for Fault Testing.*/
    if(!connect)    /* If instance didn't initialize say so and exit with fault.*/
    {
        fprintf(stderr,"MySQL Initialization Failed");
        return 1;
    }
    /* Now we will actually connect to the specific database.*/
 
    connect=mysql_real_connect(connect,SERVER,USER,PASSWORD,DATABASE,0,NULL,0);
    /* Following if statements are unneeded too, but it's worth it to show on your
    first app, so that if your database is empty or the query didn't return anything it
    will at least let you know that the connection to the mysql server was established. */
 
    if(connect){
        printf("Connection Succeeded\n");
    }
    else{
        printf("Connection Failed!\n");
    }
    MYSQL_RES *res_set; /* Create a pointer to recieve the return value.*/
    MYSQL_ROW row;  /* Assign variable for rows. */
    mysql_query(connect,"SELECT * FROM TABLE");
    /* Send a query to the database. */
    unsigned int i = 0; /* Create a counter for the rows */
 
    res_set = mysql_store_result(connect); /* Receive the result and store it in res_set */
 
    unsigned int numrows = mysql_num_rows(res_set); /* Create the count to print all rows */
 
    /* This while is to print all rows and not just the first row found, */
 
    while ((row = mysql_fetch_row(res_set)) != NULL){
        printf("%s\n",row[i] != NULL ?
        row[i] : "NULL"); /* Print the row data */
    }
    mysql_close(connect);   /* Close and shutdown */
    return 0;
}