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95 lines
3.2 KiB
Markdown
95 lines
3.2 KiB
Markdown
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# Scale your cluster
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Constellation provides all features of a Kubernetes cluster including scaling and autoscaling.
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## Worker node scaling
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### Autoscaling
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Constellation comes with autoscaling disabled by default. To enable autoscaling, find the scaling group of
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worker nodes:
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```bash
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worker_group=$(kubectl get scalinggroups -o json | jq -r '.items[].metadata.name | select(contains("worker"))')
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echo "The name of your worker scaling group is '$worker_group'"
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```
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Then, patch the `autoscaling` field of the scaling group resource to `true`:
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```bash
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kubectl patch scalinggroups $worker_group --patch '{"spec":{"autoscaling": true}}' --type='merge'
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kubectl get scalinggroup $worker_group -o jsonpath='{.spec}' | jq
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```
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The cluster autoscaler now automatically provisions additional worker nodes so that all pods have a place to run.
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You can configure the minimum and maximum number of worker nodes in the scaling group by patching the `min` or
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`max` fields of the scaling group resource:
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```bash
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kubectl patch scalinggroups $worker_group --patch '{"spec":{"max": 5}}' --type='merge'
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kubectl get scalinggroup $worker_group -o jsonpath='{.spec}' | jq
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```
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The cluster autoscaler will now never provision more than 5 worker nodes.
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If you want to see the autoscaling in action, try to add a deployment with a lot of replicas, like the
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following Nginx deployment. The number of replicas needed to trigger the autoscaling depends on the size of
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and count of your worker nodes. Wait for the rollout of the deployment to finish and compare the number of
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worker nodes before and after the deployment:
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```bash
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kubectl create deployment nginx --image=nginx --replicas 150
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kubectl -n kube-system get nodes
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kubectl rollout status deployment nginx
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kubectl -n kube-system get nodes
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```
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### Manual scaling
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Alternatively, you can manually scale your cluster up or down:
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<tabs groupId="csp">
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<tabItem value="azure" label="Azure">
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1. Find your Constellation resource group.
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2. Select the `scale-set-workers`.
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3. Go to **settings** and **scaling**.
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4. Set the new **instance count** and **save**.
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</tabItem>
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<tabItem value="gcp" label="GCP">
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1. In Compute Engine go to [Instance Groups](https://console.cloud.google.com/compute/instanceGroups/).
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2. **Edit** the **worker** instance group.
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3. Set the new **number of instances** and **save**.
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</tabItem>
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</tabs>
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## Control-plane node scaling
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Control-plane nodes can **only be scaled manually and only scaled up**!
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To increase the number of control-plane nodes, follow these steps:
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<tabs groupId="csp">
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<tabItem value="azure" label="Azure">
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1. Find your Constellation resource group.
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2. Select the `scale-set-controlplanes`.
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3. Go to **settings** and **scaling**.
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4. Set the new (increased) **instance count** and **save**.
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</tabItem>
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<tabItem value="gcp" label="GCP">
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1. In Compute Engine go to [Instance Groups](https://console.cloud.google.com/compute/instanceGroups/).
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2. **Edit** the **control-plane** instance group.
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3. Set the new (increased) **number of instances** and **save**.
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</tabItem>
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</tabs>
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If you scale down the number of control-planes nodes, the removed nodes won't be able to exit the `etcd` cluster correctly. This will endanger the quorum that's required to run a stable Kubernetes control plane.
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