What is multi-cluster?

Learn the concept of managing multiple clusters.

What is multi-cluster?

Organizations often run several clusters instead of a single one. Reasons:

Isolation: development, test and production in separate clusters; the blast radius of a failure shrinks.
Availability: clusters in different regions; if one region fails, another serves.
Proximity and regulation: a region close to users, data staying in the country.
Scale: the node and object limits of a single cluster.

gelistirme   (minikube)       ─ developers
staging     (eu-central-1)   ─ tests
uretim-eu   (eu-central-1)   ─ European users
uretim-tr   (istanbul-dc)    ─ Turkish users, local data

The cost

Several clusters increase the operational load: each is upgraded, monitored and backed up separately; configurations must stay consistent. That's why with GitOps (Argo CD, Flux) the desired state of all clusters is managed from a single Git repository:

git repository
  clusters/
    uretim-eu/   -> Argo CD -> uretim-eu cluster
    uretim-tr/   -> Argo CD -> uretim-tr cluster
  uygulamalar/magaza/  (shared chart + environment-specific values)

Exercise Move between clusters

Write three commands: list the contexts; list the nodes in the uretim-eu context (with --context uretim-eu, without switching); list the deployments in the magaza namespace in the uretim-tr context.

Show example solution

kubectl config get-contexts
kubectl get nodes --context uretim-eu
kubectl get deploy -n magaza --context uretim-tr

Test yourself

What is the most important benefit of keeping production in a separate cluster?
- Less YAML
- Faster pods
- A bug or wrong command in the test environment can't affect production
- It's cheaper
Show answer

A bug or wrong command in the test environment can't affect production — Namespaces share the same control plane; a separate cluster provides full isolation.

List all saved contexts.

kubectl config ____

Show answer

kubectl config get-contexts

Match.

isolation

Environment separation
availability

Resilience to region failure
regulation

Location of data
GitOps

Consistent configuration

Next lesson: Cluster federation

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