Criticality
Basic, Stable or Critical. What each criticality installs at a minimum, and which one to choose.
What criticality is for
Section titled “What criticality is for”It sets the minimum Fransys installs to keep the cluster up: control nodes, load balancer, worker machines. Above that minimum, AutoPilot or your own choices add machines within your budget.
The three criticalities
Section titled “The three criticalities”| Criticality | What for | At least |
|---|---|---|
| Basic | Development, proofs of concept, demos. An occasional outage is no big deal. | A single machine is possible |
| Stable | Staging, internal tools, small production. | 1 control node, 1 load balancer, 1 worker machine |
| Critical | Production: maximum availability, even if it costs more. | 3 control nodes, 1 load balancer, 3 worker machines |
Each criticality card shows its starting price, per month.
Basic: one machine or several
Section titled “Basic: one machine or several”- A single machine: everything runs on it, with no separate control node and no load balancer. No AutoPilot. The cheapest, for testing.
- Several machines: Fransys adds a control node and a load balancer to keep everything up. AutoPilot becomes possible, on the Stable base.
The recommended machine
Section titled “The recommended machine”For each criticality, the console suggests a machine:
- Basic: the cheapest, enough for testing;
- Stable: one step up, for a staging environment close to production;
- Critical: dedicated CPUs, for production.
You can choose another one; Use the recommended machine goes back to the suggestion.
The hosting provider’s requirements
Section titled “The hosting provider’s requirements”Some hosting providers require a minimum number of machines for a configuration. The console shows it, for example “Hetzner requires at least 2 machines for this configuration”.
Change the criticality
Section titled “Change the criticality”In the cluster’s Change the configuration. Changing the criticality can add or remove control nodes: the price breakdown takes this into account before you confirm.