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A cartridge is a virtual machine (VM) on an IaaS that has software components to interact with Stratos PaaS. Stratos provides cartridges for PHP, MySQL and Tomcat based applications on OpenStack and Amazon EC2 out of the box. Furthermore, Stratos supports any pluggable cartridge, which comes under the following categories: data, load balancer, framework or application. Cartridges will vary based on the operating system (OS) and IaaS. Therefore, you need to create a custom cartridge for each OS and IaaS. All cartridges in Stratos provide a very secure, OS level isolated environment for cloud applications. Cartridges can operate in two modes: single tenant and multi-tenant. The cartridge type differs based on the method that you used to to create it: generic cartridge and fully configured cartridge. If required, you can use an orchestration layer, i.e., Puppet, Chef etc., to automate the cartridge creation process.