MicroK8s - simeonlam/knowledge GitHub Wiki

reference

init setup

  • prepare cgroup config
sudo vi /boot/firmware/cmdline.txt

// add to head "cgroup_enable=memory cgroup_memory=1"
  • reboot
sudo reboot
  • install
sudo snap install microk8s --classic
  • add alias
sudo snap alias microk8s.kubectl kubectl
sudo snap alias microk8s.kubectl k
  • uninstall
sudo snap remove microk8s

Discovering MicroK8s

Quick intro to the MicroK8s command line:

  • start

    The start command will start all enabled Kubernetes services: microk8s.start

  • inspect

    The inspect command will give you the status of services in report tarball: microk8s.inspect

  • status

    The inspect command will give you the status of services in stdout: microk8s.status

  • stop

    The stop command will stop all Kubernetes services: microk8s.stop

  • add-ons

    You can easily enable Kubernetes add-ons, eg. to enable “kubedns”: microk8s.enable dns

  • cluster-info

    To get the status of the cluster: microk8s.kubectl cluster-info

    MicroK8s is easy to use and comes with plenty of Kubernetes add-ons you can enable or disable.

add-ons

    ha-cluster           # Configure high availability on the current node
    dashboard            # The Kubernetes dashboard
    dns                  # CoreDNS
    helm                 # Helm 2 - the package manager for Kubernetes
    helm3                # Helm 3 - Kubernetes package manager
    host-access          # Allow Pods connecting to Host services smoothly
    ingress              # Ingress controller for external access
    linkerd              # Linkerd is a service mesh for Kubernetes and other frameworks
    metallb              # Loadbalancer for your Kubernetes cluster
    metrics-server       # K8s Metrics Server for API access to service metrics
    portainer            # Portainer UI for your Kubernetes cluster
    prometheus           # Prometheus operator for monitoring and logging
    rbac                 # Role-Based Access Control for authorisation
    registry             # Private image registry exposed on localhost:32000
    storage              # Storage class; allocates storage from host directory
    traefik              # traefik Ingress controller for external access

  • microk8s.enable rbac

  • microk8s.enable dashboard

Enabling Metrics-Server
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
Warning: apiregistration.k8s.io/v1beta1 APIService is deprecated in v1.19+, unavailable in v1.22+; use apiregistration.k8s.io/v1 APIService
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created
serviceaccount/metrics-server created
deployment.apps/metrics-server created
service/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
clusterrolebinding.rbac.authorization.k8s.io/microk8s-admin created
Metrics-Server is enabled
Applying manifest
serviceaccount/kubernetes-dashboard created
service/kubernetes-dashboard created
secret/kubernetes-dashboard-certs created
secret/kubernetes-dashboard-csrf created
secret/kubernetes-dashboard-key-holder created
configmap/kubernetes-dashboard-settings created
role.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
deployment.apps/kubernetes-dashboard created
service/dashboard-metrics-scraper created
deployment.apps/dashboard-metrics-scraper created

If RBAC is not enabled access the dashboard using the default token retrieved with:

token=$(microk8s kubectl -n kube-system get secret | grep default-token | cut -d " " -f1)
microk8s kubectl -n kube-system describe secret $token

In an RBAC enabled setup (microk8s enable RBAC) you need to create a user with restricted
permissions as shown in:
https://github.com/kubernetes/dashboard/blob/master/docs/user/access-control/creating-sample-user.md

  • microk8s.enable helm3

  • microk8s.enable metrics-server

  • microk8s.enable portainer

Enabling default storage class
deployment.apps/hostpath-provisioner created
storageclass.storage.k8s.io/microk8s-hostpath created
serviceaccount/microk8s-hostpath created
clusterrole.rbac.authorization.k8s.io/microk8s-hostpath created
clusterrolebinding.rbac.authorization.k8s.io/microk8s-hostpath created
Storage will be available soon
Enabling DNS
Applying manifest
serviceaccount/coredns created
configmap/coredns created
deployment.apps/coredns created
service/kube-dns created
clusterrole.rbac.authorization.k8s.io/coredns created
clusterrolebinding.rbac.authorization.k8s.io/coredns created
Restarting kubelet
DNS is enabled
Enabling portainer
Warning: resource namespaces/portainer is missing the kubectl.kubernetes.io/last-applied-configuration annotation which is required by kubectl apply. kubectl apply should only be used on resources created declaratively by either kubectl create --save-config or kubectl apply. The missing annotation will be patched automatically.
namespace/portainer configured
serviceaccount/portainer-sa-clusteradmin created
persistentvolumeclaim/portainer created
clusterrolebinding.rbac.authorization.k8s.io/portainer created
service/portainer created
deployment.apps/portainer created
persistentvolumeclaim/portainer patched (no change)
Portainer has been installed
  • microk8s.enable prometheus
Addon dns is already enabled.
Fetching kube-prometheus version v0.7.0.
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kube-prometheus-0.7.0/.github/ISSUE_TEMPLATE/bug.md
kube-prometheus-0.7.0/.github/ISSUE_TEMPLATE/feature.md
kube-prometheus-0.7.0/.github/ISSUE_TEMPLATE/support.md
kube-prometheus-0.7.0/.github/workflows/
kube-prometheus-0.7.0/.github/workflows/ci.yaml
kube-prometheus-0.7.0/.gitignore
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kube-prometheus-0.7.0/code-of-conduct.md
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kube-prometheus-0.7.0/docs/developing-prometheus-rules-and-grafana-dashboards.md
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kube-prometheus-0.7.0/examples/additional-namespaces.jsonnet
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kube-prometheus-0.7.0/examples/alertmanager-config.yaml
kube-prometheus-0.7.0/examples/all-namespaces.jsonnet
kube-prometheus-0.7.0/examples/auth
kube-prometheus-0.7.0/examples/basic-auth/
kube-prometheus-0.7.0/examples/basic-auth/secrets.yaml
kube-prometheus-0.7.0/examples/basic-auth/service-monitor.yaml
kube-prometheus-0.7.0/examples/continuous-delivery/
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kube-prometheus-0.7.0/examples/continuous-delivery/argocd/README.md
kube-prometheus-0.7.0/examples/continuous-delivery/argocd/application.yaml
kube-prometheus-0.7.0/examples/continuous-delivery/argocd/appproject.yaml
kube-prometheus-0.7.0/examples/continuous-delivery/argocd/kube-prometheus/
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kube-prometheus-0.7.0/examples/eks-cni-example.jsonnet
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kube-prometheus-0.7.0/examples/example-app/prometheus-frontend-alertmanager-discovery-role-binding.yaml
kube-prometheus-0.7.0/examples/example-app/prometheus-frontend-alertmanager-discovery-role.yaml
kube-prometheus-0.7.0/examples/example-app/prometheus-frontend-role-binding.yaml
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kube-prometheus-0.7.0/examples/example-app/prometheus-frontend-service-account.yaml
kube-prometheus-0.7.0/examples/example-app/prometheus-frontend-svc.yaml
kube-prometheus-0.7.0/examples/example-app/prometheus-frontend.yaml
kube-prometheus-0.7.0/examples/example-app/servicemonitor-frontend.yaml
kube-prometheus-0.7.0/examples/example-grafana-dashboard.json
kube-prometheus-0.7.0/examples/existingrule.json
kube-prometheus-0.7.0/examples/existingrule.yaml
kube-prometheus-0.7.0/examples/grafana-additional-jsonnet-dashboard-example.jsonnet
kube-prometheus-0.7.0/examples/grafana-additional-rendered-dashboard-example-2.jsonnet
kube-prometheus-0.7.0/examples/grafana-additional-rendered-dashboard-example.jsonnet
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kube-prometheus-0.7.0/manifests/prometheus-service.yaml
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kube-prometheus-0.7.0/manifests/setup/prometheus-operator-serviceAccount.yaml
kube-prometheus-0.7.0/scripts/
kube-prometheus-0.7.0/scripts/go.mod
kube-prometheus-0.7.0/scripts/go.sum
kube-prometheus-0.7.0/scripts/minikube-start-kvm.sh
kube-prometheus-0.7.0/scripts/minikube-start.sh
kube-prometheus-0.7.0/scripts/monitoring-deploy.sh
kube-prometheus-0.7.0/scripts/tools.go
kube-prometheus-0.7.0/sync-to-internal-registry.jsonnet
kube-prometheus-0.7.0/test.sh
kube-prometheus-0.7.0/tests/
kube-prometheus-0.7.0/tests/e2e/
kube-prometheus-0.7.0/tests/e2e/main_test.go
kube-prometheus-0.7.0/tests/e2e/prometheus_client.go
Enabling Prometheus
namespace/monitoring created
customresourcedefinition.apiextensions.k8s.io/alertmanagerconfigs.monitoring.coreos.com created
customresourcedefinition.apiextensions.k8s.io/alertmanagers.monitoring.coreos.com created
customresourcedefinition.apiextensions.k8s.io/podmonitors.monitoring.coreos.com created
customresourcedefinition.apiextensions.k8s.io/probes.monitoring.coreos.com created
customresourcedefinition.apiextensions.k8s.io/prometheuses.monitoring.coreos.com created
customresourcedefinition.apiextensions.k8s.io/prometheusrules.monitoring.coreos.com created
customresourcedefinition.apiextensions.k8s.io/servicemonitors.monitoring.coreos.com created
customresourcedefinition.apiextensions.k8s.io/thanosrulers.monitoring.coreos.com created
clusterrole.rbac.authorization.k8s.io/prometheus-operator created
clusterrolebinding.rbac.authorization.k8s.io/prometheus-operator created
deployment.apps/prometheus-operator created
service/prometheus-operator created
serviceaccount/prometheus-operator created
alertmanager.monitoring.coreos.com/main created
secret/alertmanager-main created
service/alertmanager-main created
serviceaccount/alertmanager-main created
servicemonitor.monitoring.coreos.com/alertmanager created
secret/grafana-datasources created
configmap/grafana-dashboard-apiserver created
configmap/grafana-dashboard-cluster-total created
configmap/grafana-dashboard-controller-manager created
configmap/grafana-dashboard-k8s-resources-cluster created
configmap/grafana-dashboard-k8s-resources-namespace created
configmap/grafana-dashboard-k8s-resources-node created
configmap/grafana-dashboard-k8s-resources-pod created
configmap/grafana-dashboard-k8s-resources-workload created
configmap/grafana-dashboard-k8s-resources-workloads-namespace created
configmap/grafana-dashboard-kubelet created
configmap/grafana-dashboard-namespace-by-pod created
configmap/grafana-dashboard-namespace-by-workload created
configmap/grafana-dashboard-node-cluster-rsrc-use created
configmap/grafana-dashboard-node-rsrc-use created
configmap/grafana-dashboard-nodes created
configmap/grafana-dashboard-persistentvolumesusage created
configmap/grafana-dashboard-pod-total created
configmap/grafana-dashboard-prometheus-remote-write created
configmap/grafana-dashboard-prometheus created
configmap/grafana-dashboard-proxy created
configmap/grafana-dashboard-scheduler created
configmap/grafana-dashboard-statefulset created
configmap/grafana-dashboard-workload-total created
configmap/grafana-dashboards created
deployment.apps/grafana created
service/grafana created
serviceaccount/grafana created
servicemonitor.monitoring.coreos.com/grafana created
clusterrole.rbac.authorization.k8s.io/kube-state-metrics created
clusterrolebinding.rbac.authorization.k8s.io/kube-state-metrics created
deployment.apps/kube-state-metrics created
service/kube-state-metrics created
serviceaccount/kube-state-metrics created
servicemonitor.monitoring.coreos.com/kube-state-metrics created
clusterrole.rbac.authorization.k8s.io/node-exporter created
clusterrolebinding.rbac.authorization.k8s.io/node-exporter created
daemonset.apps/node-exporter created
service/node-exporter created
serviceaccount/node-exporter created
servicemonitor.monitoring.coreos.com/node-exporter created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io configured
clusterrole.rbac.authorization.k8s.io/prometheus-adapter created
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader unchanged
clusterrolebinding.rbac.authorization.k8s.io/prometheus-adapter created
clusterrolebinding.rbac.authorization.k8s.io/resource-metrics:system:auth-delegator created
clusterrole.rbac.authorization.k8s.io/resource-metrics-server-resources created
configmap/adapter-config created
deployment.apps/prometheus-adapter created
rolebinding.rbac.authorization.k8s.io/resource-metrics-auth-reader created
service/prometheus-adapter created
serviceaccount/prometheus-adapter created
servicemonitor.monitoring.coreos.com/prometheus-adapter created
clusterrole.rbac.authorization.k8s.io/prometheus-k8s created
clusterrolebinding.rbac.authorization.k8s.io/prometheus-k8s created
servicemonitor.monitoring.coreos.com/prometheus-operator created
prometheus.monitoring.coreos.com/k8s created
rolebinding.rbac.authorization.k8s.io/prometheus-k8s-config created
rolebinding.rbac.authorization.k8s.io/prometheus-k8s created
rolebinding.rbac.authorization.k8s.io/prometheus-k8s created
rolebinding.rbac.authorization.k8s.io/prometheus-k8s created
role.rbac.authorization.k8s.io/prometheus-k8s-config created
role.rbac.authorization.k8s.io/prometheus-k8s created
role.rbac.authorization.k8s.io/prometheus-k8s created
role.rbac.authorization.k8s.io/prometheus-k8s created
prometheusrule.monitoring.coreos.com/prometheus-k8s-rules created
service/prometheus-k8s created
serviceaccount/prometheus-k8s created
servicemonitor.monitoring.coreos.com/prometheus created
servicemonitor.monitoring.coreos.com/kube-apiserver created
servicemonitor.monitoring.coreos.com/coredns created
servicemonitor.monitoring.coreos.com/kube-controller-manager created
servicemonitor.monitoring.coreos.com/kube-scheduler created
servicemonitor.monitoring.coreos.com/kubelet created
The Prometheus operator is enabled (user/pass: admin/admin)
  • microk8s.enable traefik
Enabling traefik ingress controller on port 8080
serviceaccount/traefik-ingress-controller created
daemonset.apps/traefik-ingress-controller created
service/traefik-ingress-service created
clusterrole.rbac.authorization.k8s.io/traefik-ingress-controller created
clusterrolebinding.rbac.authorization.k8s.io/traefik-ingress-controller created
service/traefik-web-ui created
ingress.networking.k8s.io/traefik-web-ui created
traefik ingress controller has been installed on port 8080