Rancher Requirements
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RKE
high-availability RKE cluster
- Three Linux nodes, typically virtual machines, in an infrastructure provider such as Amazon’s EC2, Google Compute Engine, or vSphere.
- These nodes must be in the same region/data center. You may place these servers in separate availability zones.
- Rancher server data is stored on etcd database that runs on all three nodes.
- etcd is a distributed reliable key-value store for the most critical data of a distributed system, with a focus: Simple, Secure, Fast & Reliable.
- etcd database requires an odd number of nodes so that it can always elect a leader with a majority of the etcd cluster.
- general installation requirements for OS, container runtime, hardware, and networking.
| Deployment Size | Clusters | Nodes | vCPUs | RAM |
|---|---|---|---|---|
| Small | Up to 150 | Up to 1500 | 2 | 8 GB |
| Medium | Up to 300 | Up to 3000 | 4 | 16 GB |
| Large | Up to 500 | Up to 5000 | 8 | 32 GB |
| X-Large | Up to 1000 | Up to 10,000 | 16 | 64 GB |
| XX-Large | Up to 2000 | Up to 20,000 | 32 | 128 GB |
- Contact Rancher for more than 2000 clusters and/or 20,000 nodes.
- A load balancer to direct front-end traffic to the three nodes.
- A DNS record to map a URL to the load balancer. This will become the Rancher server URL, and downstream Kubernetes clusters will need to reach it.