kubernetes-部署longhorn

Posted 2021-12-24 南北二斗

一、部署longhorn

longhorn官网：​​https://www.rancher.cn/longhorn​​

kubectl apply -f https://raw.githubusercontent.com/longhorn/longhorn/v1.2.3/deploy/longhorn.yaml

kubectl get pods \\
--namespace longhorn-system \\
--watch

kubectl -n longhorn-system get pod

二、测试longhorn

1、查看storageclass

root@xirang:~# kubectl get sc
NAME       PROVISIONER          RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
longhorn   driver.longhorn.io   Delete          Immediate           true                   28s

2、创建pod、验证是否是pvc---->storageclass---->pv

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: longhorn-volv-pvc
  namespace: default
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: longhorn
  resources:
    requests:
      storage: 2Gi
---
apiVersion: v1
kind: Pod
metadata:
  name: volume-test
  namespace: default
spec:
  restartPolicy: Always
  containers:
  - name: volume-test
    image: nginx:stable-alpine
    imagePullPolicy: IfNotPresent
    livenessProbe:
      exec:
        command:
          - ls
          - /data/lost+found
      initialDelaySeconds: 5
      periodSeconds: 5
    volumeMounts:
    - name: volv
      mountPath: /data
    ports:
    - containerPort: 80
  volumes:
  - name: volv
    persistentVolumeClaim:
      claimName: longhorn-volv-pvc

3、查看pv、pvc

root@xirang:~# kubectl get pods
NAME          READY   STATUS    RESTARTS   AGE
volume-test   1/1     Running   0          5m14s

root@xirang:~# kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                       STORAGECLASS   REASON   AGE
pvc-19708d1d-7cef-4800-9a78-b58dabcebe15   2Gi        RWO            Delete           Bound    default/longhorn-volv-pvc   longhorn                5m14s

root@xirang:~# kubectl get pvc
NAME                STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
longhorn-volv-pvc   Bound    pvc-19708d1d-7cef-4800-9a78-b58dabcebe15   2Gi        RWO            longhorn       5m19s

4、查看数据存储目录，每个节点都会保存一份pvc数据的副本

[root@node02 ~]# ls /var/lib/longhorn/replicas/
pvc-19708d1d-7cef-4800-9a78-b58dabcebe15-d2569ce8

5、访问Longhorn UI

#找到拥有app=longhorn-ui标签的pod
kubectl -n longhorn-system get svc -l app=longhorn-ui

#创建service

apiVersion: v1
kind: Service
metadata:
  name: longhorn-ui-svc
spec:
  type: NodePort
  selector:
    app: longhorn-ui
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8000

通过http://node_ip:nodeport访问