Puppet Application Manager runs on Kubernetes. Puppet provides several supported configurations for different use cases.
Puppet Application Manager can run on Puppet-supported or customer-supported Kubernetes clusters. For more information on installing on a customer-supported Kubernetes cluster, see Install Puppet applications using Puppet Application Manager and an existing Kubernetes cluster.
Throughout this documentation, we use a few terms to describe different roles nodes can take:
- Primary - A primary node runs core Kubernetes components (referred to as the Kubernetes control plane) as well as application workloads. At least three primaries are required to support high availability for Puppet Application Manager. These are also sometimes referred to as masters.
- Secondary - A secondary node runs application workloads. These are also sometimes referred to as workers.
Puppet Application Manager is built on the KOTS (Kubernetes
off-the-Shelf) project, and we occasionally use its CLI tools (
kots) to manage
Standalone is optimized for limited resources, storing data directly on disk. If you need to remove optional components like Prometheus and Grafana to decrease resource utilization, see Optional components. While additional compute capacity can be added through secondary nodes, this does not provide increased resilience as data is only stored on the node where a component service runs.
For information on migrating data from standalone to HA deployments, see Migrating data between two systems with different architectures.
A high availability (HA) architecture provides high availability for scheduling application services during failure and uses Ceph for distributed storage in case of node failure. Individual applications may still experience some loss of availability (up to 10 minutes) if individual services do not have replicas and need to be rescheduled. For more information, see Reduce recovery time when a node fails. An HA implementation requires a cluster of three primary nodes. Additional compute capacity can be added through secondary nodes.
The HA architecture installs Prometheus and Alertmanager. These are used to provide system monitoring in the Puppet Application Manager UI. Prometheus and Alertmanager are unauthenticated on ports 30900 and 30903, and you are recommended to control access to these ports via firewall rules. For information on how to remove Prometheus and Alertmanager, see Optional components.
Puppet Application Manager architectures
For information on setting up health checks for your load balancer, see Load balancer health checks
UNSUPPORTED: Legacy architecture
The Puppet Application Manager legacy architecture reflects an older configuration that used Ceph 1.0 which hosted data directly on the file system. Installing the legacy architecture is no longer supported.