MicroK8s : インストール2023/04/27

Canonical 社発の軽量 Kubernetes 環境 [MicroK8s] をインストールします。

[1]	Snappy から MicroK8s をインストールします。 Snappy は Ubuntu サーバーデフォルトでインストールされ、自動起動していますが、起動していない場合は、事前に [systemctl start snapd.socket] で起動しておく必要があります。

root@dlp:~#

snap install microk8s --classic

microk8s (1.26/stable) v1.26.3 from Canonical✓ installed

[2]	MicroK8s インストール後は、自動的に起動しています。停止や起動等は以下のように実行します。

# 現在の状態確認

root@dlp:~#

microk8s status

microk8s is running
high-availability: no
  datastore master nodes: 127.0.0.1:19001
  datastore standby nodes: none
addons:
  enabled:
    ha-cluster           # (core) Configure high availability on the current node
    helm                 # (core) Helm - the package manager for Kubernetes
    helm3                # (core) Helm 3 - the package manager for Kubernetes
  disabled:
    cert-manager         # (core) Cloud native certificate management
    community            # (core) The community addons repository
    dashboard            # (core) The Kubernetes dashboard
    dns                  # (core) CoreDNS
    gpu                  # (core) Automatic enablement of Nvidia CUDA
    host-access          # (core) Allow Pods connecting to Host services smoothly
    hostpath-storage     # (core) Storage class; allocates storage from host directory
    ingress              # (core) Ingress controller for external access
    kube-ovn             # (core) An advanced network fabric for Kubernetes
    mayastor             # (core) OpenEBS MayaStor
    metallb              # (core) Loadbalancer for your Kubernetes cluster
    metrics-server       # (core) K8s Metrics Server for API access to service metrics
    minio                # (core) MinIO object storage
    observability        # (core) A lightweight observability stack for logs, traces and metrics
    prometheus           # (core) Prometheus operator for monitoring and logging
    rbac                 # (core) Role-Based Access Control for authorisation
    registry             # (core) Private image registry exposed on localhost:32000
    storage              # (core) Alias to hostpath-storage add-on, deprecated

# 現在の設定確認

root@dlp:~#

microk8s config

apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0...
    server: https://10.0.0.30:16443
  name: microk8s-cluster
contexts:
- context:
    cluster: microk8s-cluster
    user: admin
  name: microk8s
current-context: microk8s
kind: Config
preferences: {}
users:
- name: admin
  user:
    token: SWpKOC9XYWJaZXlOdVpZNHhRL0tpV1oyWCtEWDFZby9qQkJSQ0UrcmZYRT0K

root@dlp:~#

microk8s kubectl get all

NAME                 TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   10.152.183.1   <none>        443/TCP   2m34s

root@dlp:~#

microk8s kubectl get nodes

NAME            STATUS   ROLES    AGE     VERSION
dlp.srv.world   Ready    <none>   2m55s   v1.26.3

# MicroK8s を停止する

root@dlp:~#

microk8s stop

Stopped.

root@dlp:~#

microk8s status

microk8s is not running, try microk8s start

# MicroK8s を開始する

root@dlp:~#

microk8s start

Started.

# MicroK8s を無効にする

root@dlp:~#

snap disable microk8s

microk8s disabled

# MicroK8s を有効にする

root@dlp:~#

snap enable microk8s

microk8s enabled