LampCluster - Scalable LAMP Cluster

Functional Overview

LampCluster - Scalable LAMP Cluster application is a Reference design for a basic scalable lamp infrastructure. It is designed for rapid deployment and easy management. This application allows direct ssh access to the apache and mysql server appliances, without the need to access the grid controller.

This application can be deployed on shared grids where it is not possible to give the application manger access to the AppLogic Interface.

Boundary

Properties

Resources

User Volumes

The application itself uses several volumes, described below. They are part of the application and are already configured into the appliance instances. There are no volumes that need to be configured on the application boundary.

Operation

Implementation details

To access these appliances point your ssh client or your browser to web_ip and the desired port.

Each Apache (denoted as srv1 through srv4) and the MYSQL (denoted as dbase) is a basic install of CentOS-5. It includes a basic build environment with GCC. the following packages have been installed using yum in their default configurations:

mysql, php, php-mysql, php-pear, httpd, php-GD, ImageMagic, ImageMagic-perl

Any of the other CentOS packages can be installed by the end user, simply by running yum -y install <package> while running as root user.

On first boot the initial user is created and the system places the root password in a file. (/home/<user>/su.txt). any of these instances can be reset to the default properties by deleting /appliance/passwd.stamp from the appliance and restarting the application.

The Apache appliances can connect to the database with the hostname "db" (e.g. "mysql -h db") the default database has sufficient permissions for the root user of any of the Apache appliances.

Initial application setup

Use the following steps to get your own LampCluster application up and running on an AppLogic grid. This example creates a LampCluster application called mylampcluster.

• Provision the LampCluster application using the command below. All properties should be set to their appropriate values (IPs, DNS servers, etc). All 4 web servers are enabled in order to accomidate for possible heavy traffic loads. Also, the sizes of the fs and mysql volumes are increased to 250MB.
  • app provision LampCluster mylampcluster user=usr1 user_pw=userpw root_pw=rootpw web_ip=1.2.3.4 net_ip=1.2.3.5 netmask=255.255.255.0  gateway=1.2.3.1 dns1=1.2.3.6 dns2=1.2.3.1 data.size=250MB dbase.size=250MB
• AppLogic will provision the mylampcluser application and start it on the grid. Wait for the application to start; this may take serveral minutes.
• Now you can access your application using a browser. Open up a browser and point it to the configured web_ip and you will see a test web page from the Apache web server. If you do not see a test page, make sure your IP addresses are configured correctly and restart the application if needed.
• You now have a running LampCluster application on your grid. All that is left to do is to install your specific application onto the application volumes and your application will be ready to go.

Application Architecture

Application Volumes

The LAMP application has the following volumes:

Notes

Questions and Comments

To post questions and/or comments for this application, visit our forum.

-- JessieSmart - 16 May 2007