WEKA project description
The WEKA project ultimately uses the internal GCP resources. A basic WEKA project includes a cluster with several virtual private clouds (VPCs), VMs (instances), a load balancer, DNS, cloud storage, a secret manager, and a few more elements that manage the resize of the cluster. The peering between all the virtual networks enables running the functions across all the networks.
Resize cloud function operation
A resize cloud function in vpc-0 and a workload listener are deployed for auto-scale instances in GCP. Once a user sends a request for resizing the number of instances in the cluster, the workload listener checks the cluster state file in the cloud storage and triggers the resize cloud function if a resize is required. The cluster state file is an essential part of the resizing decision. It indicates states such as:
Readiness of the cluster.
The number of existing instances.
The number of requested instances.
The secret manager retains the user name (usually admin) and the Terraform-generated password. The resize cloud function uses the user name and password to operate on the cluster instances.
GCP subnet types
Depending on the required security level, you can deploy the WEKA project on one of the following subnet types:
Public subnet: Use a public subnet within your VPC with an internet gateway, and allow public IP addresses for your instances.
Private subnet shared with a Bastion project: Create a private subnet with a shared project with a Bastion project, a risk-based security solution used for authenticating communication with a public network, such as downloading the WEKA software from get.weka.io. The Bastion project includes a Bastion VM (host) acting as a network gateway. The relevant ports are open (by the Terraform files).
Private subnet shared with a yum project: If a connection to get.weka.io for downloading the WEKA software is impossible, create a private subnet with a yum repository containing the WEKA software. The relevant ports are open (by the Terraform files).
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