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Kiuwan On-Premises (KoP) is based on a client-server architecture that includes these major server components:
- Apache web server
- Wildfly application server
- MySQL database
- Redis in-memory data store
Kiuwan On-Premises can be installed on a single host or on multiple hosts (externalizing one, some or all of the provided infrastructure services).
You can also install Kiuwan On-Premises under your own AWS cloud, replacing the provided infrastructure services with compatible AWS services.
Kiuwan On-Premises and its roles
Kiuwan On-Premises defines three different roles for each instance:
- Kiuwan front: receives and answers HTTPS, HTTP or AJP requests (depending on your configuration) from the Apache web server (or directly from a client, depending on your configuration), both for the web application and REST API calls.
- Kiuwan analyzer: processes analysis results asynchronously.
- Kiuwan scheduler: processes background tasks such as notifications and Kiuwan Insights database updates.
The default installation will create a Kiuwan instance of each role.
All needed services re supplied as Docker containers. The following table summarizes all the available services:
The following diagram shows how Kiuwan On-Premises would be set out by default (that is, a single host default installation):
The main purpose of each piece is (service names are shown between parentheses):
- Apache (apacheloadbalancer): an Apache instance that balances the traffic between Kiuwan frontals (kept in the default installation to allow easy frontal scaling).
- Kiuwan front (wildflykiuwan-f1): a Kiuwan frontal.
- Kiuwan analyzer (wildflykiuwan-a1): a Kiuwan analyzer.
- Kiuwan scheduler (wildflykiuwan-s1): a Kiuwan scheduler.
- MySQL (mysqlkiuwan): the main Kiuwan database.
- Redis cluster (redis_0000[n]): Redis store nodes, used by Kiuwan as data cache.
- Redis cluster creator (clustercreator): a temporal redis container that configures each Redis node as a cluster.
- Kiuwan updater (updaterkiuwan): a temporal Kiuwan instance that installs, updates and upgrades needed data or configuration.
Note that connection with Kiuwan Cloud is only needed in some situations (see Needed internet connections).
Depending on your needs, the Kiuwan On-Premises architecture supports both clustered environments and single-host installations. You can:
- Keep all services in an all-in-one host installation.
- Decide where each service will be installed, one by one (both Kiuwan services and infrastructure).
- Externalize one, some or all of the provided non-Kiuwan services:
- Apache load balancer
All Kiuwan instance containers can be scaled up (to a limit) or down to the default configuration. This means that you can start more containers of each Kiuwan role depending on your load needs.
To illustrate the flexibility that Kiuwan On-Premises installation tool provides, an alternative and possible configuration is depicted in the following image (Kiuwan Cloud and temporal services were ommitted in order to simplify the diagram):
As the picture shows, you can distribute Kiuwan On-Premises services across different hosts and use external services to replace some of the ones provided.
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