We talked about ”Web applIcation Service Provider” (WISP) in the past days. So what are the specification for a Service Provder wanting to be a WISP?
Let’try to sketch them together:
- A WISP must offer a set of XML-RPC API (WISP API) to configure the services. They must be simpler than SOAP, and must support at least two languages picked from Python,Ruby,Java,PHP, Perl.
- WISP API should be provided always in SSL way.
- WISP API specification will be provided on subsequent articles
- WISP must provide a minimal set of LAMP applications, like WebMail, CMS (i.e. WordPress). Also WISP must provide at least one “dashboard” web interface to set up a dashboard for the WISP API
- For simplicity, the web application are deployed as two tiered: database tier and web tier. Anyway you can build complex system connecting a lot of 2-tier application
- On the database tier, WISP must give at least one Relational Database (like MySQL or PostgresSQL) and one NoSQL solution, altrought NoSQL forest is a bit tricky.
- About email, at least an IMAP server and SMTP server must be provided
- It should be possible to define “logical user” to segregate email mailboxes and web application
- The amount of RAM allowed to be consumed by application should be considered only on the application tier. Database and webmail will be offered on a “best effort” base, with clear defined limits.
For special needs, a “private” database instance could be installed
- The Service Level Agreement (SLA) should be at least 99.99%
- WISP has the freedom to choose the underling Operating System. By the way, the web application should try to be agnostic (even if Linux is always the first choice for a LAMP stack)
- WISP must provide bandwidth and disk space in a very cheap way. For this reason, the “usage meter” should be easy to compute and very liberal on disk space, while very strong on single application memory usage