In an earlier post I described how to set up a Slicehost server to run GemStone/S and we demonstrated serving web pages using a Smalltalk web server. In this post we look at installing and configuring Apache and FastCGI so that you can run Seaside in GemStone/S behind Apache.

Start by logging in to your Slice (I’ve created an alias name ‘slice’ for this command):

    ssh -p 30000 glass@slice

Next, install Apache:

    install apache2 apache2.2-common apache2-mpm-prefork apache2-utils \
        libexpat1 ssl-cert apache2-threaded-dev

Now you should be able to navigate to your site and see the words “It Works!” by entering the following in a browser:

    http://slice/

GLASS can be configured to use FastCGI and we need to download, build, install, and enable it:

    wget http://www.fastcgi.com/dist/mod_fastcgi-current.tar.gz
    tar zxvf mod_fastcgi-current.tar.gz
    cd mod_fastcgi*
    cp Makefile.AP2 Makefile
    make top_dir=/usr/share/apache2
    sudo make install top_dir=/usr/share/apache2

Create a file that will load the FastCGI module (we will enable it later):

    echo "LoadModule fastcgi_module /usr/lib/apache2/modules/mod_fastcgi.so" \
        > fastcgi.load
    sudo mv fastcgi.load /etc/apache2/mods-available/

Now we need to configure Apache to route requests to GemStone/S. Apache has a rich set of configuration options, including places to put config files. The basic model is that Apache reads /etc/apache2/apache2.conf and that file has a series of includes that pull in other files. Following the general spirit of how Apache seems to expect things, we can add a configuration file that references another config file:

    echo "Include /opt/gemstone/etc/apache2.conf" > glass
    sudo mv glass /etc/apache2/sites-available/

Now we need to create some directories and set some permissions.

    chmod 775 /opt/gemstone
    cd /opt/gemstone
    mkdir etc www www/glass1 www/glass2 www/glass3

Now we can create our Apache config file named /opt/gemstone/etc/apache2.conf and past the following lines (edit the second line that has an email address):

ServerName  glass
ServerAdmin webadmin@yourdomain.com

Listen 8081
Listen 8082
Listen 8083

FastCgiExternalServer /opt/gemstone/www/glass1/seaside \
    -host localhost:9001 -pass-header Authorization
FastCgiExternalServer /opt/gemstone/www/glass2/seaside \
    -host localhost:9002 -pass-header Authorization
FastCgiExternalServer /opt/gemstone/www/glass3/seaside \
    -host localhost:9003 -pass-header Authorization

<VirtualHost *:80>
        DocumentRoot /opt/gemstone/www
        CustomLog    /opt/gemstone/log/glass-access.log combined
        ErrorLog     /opt/gemstone/log/glass-error.log
        LogLevel     info
    <Directory "/opt/gemstone/www">
        Options Indexes FollowSymLinks
        AllowOverride None
        Order allow,deny
        Allow from all
    </Directory>

        <Proxy /seaside>
            AddDefaultCharset off
            Order allow,deny
            Allow from all
        </Proxy>
        ProxyPreserveHost On     #make proxy rewrite urls in the output
        ProxyPass /seaside balancer://gemtrio
        ProxyPassReverse /seaside balancer://gemtrio
        <Proxy balancer://gemtrio>
            Order allow,deny
            Allow from all
            BalancerMember http://localhost:8081/seaside
            BalancerMember http://localhost:8082/seaside
            BalancerMember http://localhost:8083/seaside
        </Proxy>
</VirtualHost>

<VirtualHost *:8081>
        CustomLog     /opt/gemstone/log/glass-vhost-8081-access.log combined
        ErrorLog      /opt/gemstone/log/glass-vhost-8081-error.log
        LogLevel      warn
        DocumentRoot /opt/gemstone/www/glass1
</VirtualHost>

<VirtualHost *:8082>
        CustomLog     /opt/gemstone/log/glass-vhost-8082-access.log combined
        ErrorLog      /opt/gemstone/log/glass-vhost-8082-error.log
        LogLevel      warn
        DocumentRoot /opt/gemstone/www/glass2
</VirtualHost>

<VirtualHost *:8083>
        CustomLog     /opt/gemstone/log/glass-vhost-8083-access.log combined
        ErrorLog      /opt/gemstone/log/glass-vhost-8083-error.log
        LogLevel      warn
        DocumentRoot /opt/gemstone/www/glass3
</VirtualHost>

Now we are ready to enable the new site and restart Apache:

    sudo a2enmod proxy_balancer
    sudo a2enmod proxy_http
    sudo a2enmod fastcgi
    sudo a2dissite 000-default
    sudo a2ensite glass
    sudo apache2ctl restart

Create a new home page:

    echo '<html><body><h1><a href="seaside">Seaside Rocks!</a></h1></body></html>' \
        > /opt/gemstone/www/index.html

If there are no errors, then you should be able to view the new home page by refreshing your web browser. Now we need to start GemStone and start some Gems:

    source /opt/gemstone/product/seaside/defSeaside
    startGemstone
    runSeasideGems start

At this point you should be able to refresh your browser and follow the link to Seaside. You can log out of the Slicehost virtual private server at this point and leave GemStone/S running.

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