Clusters are used to distribute traffic, support databases, store files and business applications in the network. Deployment of a fault-tolerant cluster based on OpenShift Kubernetes Distribution (OKD)/OpenShift Container Platform (OCP) ensures horizontal scaling of all system components.
To deploy a fault-tolerant cluster based on OKD/OCP:
Prepare and deploy a cluster based on OKD/OCP:
Install and update Foresight Mobile Platform on the cluster.
Add work nodes if required.
Enable monitoring and logging of mobile platform components if required.
When working with nodes use hosts that meet the system requirements.
Generalized scheme of fault-tolerant cluster architecture deployment:
The scheme displays the work of main cluster nodes and their interaction with work nodes and incoming requests via special services with load balancer support.
Scheme of providing control cluster part fault-tolerance:
NOTE. Each main node in the cluster contains the following processes and components:
• kube-apiserver. Single control point for cluster. The kubectl command interacts directly via API.
• kube-controller-manager. Process of cluster status control via controllers.
• kube-scheduler. Process of task planning on all available cluster nodes.
• etcd. Database based on the key-value pairs that stores information about statuses of all cluster components.
The table contains minimum recommended system requirements for hosts:
| Name | Type/Role | Operating system | Number of vCPU cores | vRAM volume | Virtual drive volume (vStorage) | IP address |
| rt.prod.okd.lan | Router | FreeBSD | 1 | 1 | 8 | 192.168.0.1 |
| srv.prod.okd.lan | DNS/LB/Web | Fedora Server | 4 | 8 | 60 | 192.168.0.2 |
| bs.prod.okd.lan | Bootstrap | FCOS | 4 | 16 | 120 | 192.168.0.10 |
| mst-1.prod.okd.lan | Master | FCOS | 4 | 16 | 120 | 192.168.0.11 |
| mst-2.prod.okd.lan | Master | FCOS | 4 | 16 | 120 | 192.168.0.12 |
| mst-3.prod.okd.lan | Master | FCOS | 4 | 16 | 120 | 192.168.0.13 |
| wrk-1.prod.okd.lan | Worker, Registry | FCOS | 8 | 16 | 20, 50, 8, 8, 8, 101, 9 | 192.168.0.14 |
| wrk-2.prod.okd.lan | Worker | FCOS | 8 | 16 | 20, 50, 8, 8, 8, 8 | 192.168.0.15 |
| wrk-3.prod.okd.lan | Worker | FCOS | 8 | 16 | 20, 100, 10, 8, 8, 8, 8 | 192.168.0.16 |
| wrk-4.prod.okd.lan | Worker | FCOS | 8 | 16 | 20, 10, 8, 8, 8, 101, 9 | 192.168.0.17 |
NOTE. Names and IP addresses of hosts are specified for the example of preparation and deployment of cluster based on OKD/OCP and may differ.
See also:
Installing and Setting Up Foresight Mobile Platform | Preparing Environment and Deploying Auxiliary Nodes