Metrics-server¶

Getting Started¶

Install metrics-server from kubernetes-sigs repository¶

install metrics server using kubectl

kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

Install metrics-server from Bitnami Helm Charts repository¶

install helm repository

helm repo add bitnami https://charts.bitnami.com/bitnami
helm repo update

create metrics-server namespace

kubectl create namespace metrics-server

create metrics-server configuration values file for your installation (i.e. linode)
```
vi linode.yaml
```
check pod resource usage
```
kubectl top pod <pod_name>
```

install helm Chart

helm install -n metrics-server metrics-server bitnami/metrics-server -f linode.yaml

get all resources in metrics-server namespace
```
kubectl -n metrics-server get all -o wide
```

Troubleshooting¶

Install metrics-server in kubernetes in docker-desktop¶

patch the metrics-server deployment using this command

kubectl patch deployment metrics-server -n kube-system --type json \
    -p '[{"op": "add", "path": "/spec/template/spec/containers/0/args/-",
    "value": "--kubelet-insecure-tls"}]'

Install metrics-server in kubernetes in docker (kind) cluster¶

Github issue: https://github.com/kubernetes-sigs/kind/issues/398
kubernetes deployment using kind (kubernetes in docker) needs the following configuration for the metrics-server container
```
    args:
        - --kubelet-insecure-tls
        - --kubelet-preferred-address-types=InternalIP
```

update the metrics-server installation manifest for kind cluster or patch using kubectl from this Github gist

kubectl patch deployment metrics-server -n kube-system --type json \
    -p '[{"op": "replace", "path": "/spec/template/spec/containers/0/args",
    "value": [
        "--cert-dir=/tmp",
        "--secure-port=443",
        "--kubelet-insecure-tls",
        "--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname",
        "--kubelet-use-node-status-port",
        "--metric-resolution=15s"
    ]}]'