参考文献: Kubernetesマイクロサービス開発の実践 (早川博 著)
https://qiita.com/ysakashita/items/67a452e76260b1211920
https://zenn.dev/daiskoba/articles/c4ae31ef25657e
kubectl explain storageclass
kubectl explain persistentvolume
kubectl explain statefulsets
kubectl api-resources
-- 1. workerノードでマウント先のディレクトリ作成
sudo rm -rf /mnt/disks
sudo mkdir -p /mnt/disks/vol{1,2}
sudo chmod 777 /mnt/disks/vol{1,2}
ls -lR /mnt/disks
-- 2. ストレージ作成
cat <<-'EOF' > sc.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: lc01
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer
EOF
kubectl apply -f sc.yaml
kubectl get sc
kubectl delete -f sc.yaml
-- 3. PersistentVolume作成
cat <<-'EOF' > pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv01
spec:
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Retain
storageClassName: lc01
local:
path: /mnt/disks/vol1
nodeAffinity:
required:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- mmm162
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv02
spec:
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Retain
storageClassName: lc01
local:
path: /mnt/disks/vol2
nodeAffinity:
required:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- mmm162
EOF
kubectl apply -f pv.yaml
kubectl get pv
kubectl delete persistentvolumeclaim hoge-sts01-0
kubectl delete persistentvolumeclaim hoge-sts01-1
kubectl delete -f pv.yaml
-- 4. StatefulSet作成
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: sts01
spec:
selector:
matchLabels:
app: busybox
replicas: 2
template:
metadata:
labels:
app: busybox
spec:
containers:
- name: busybox
image: busybox
command: ["/bin/sh","-c"]
args:
- |
while true; do
echo "$(date -u) / from $(hostname)" >> /data/out.txt
sleep 5
done
volumeMounts:
- name: hoge
mountPath: /data
volumeClaimTemplates:
- metadata:
name: hoge
spec:
accessModes: [ "ReadWriteOnce" ]
storageClassName: lc01
resources:
requests:
storage: 1Gi
EOF
kubectl get pod,sc,pv,pvc,sts
cat /mnt/disks/vol1/out.txt
cat /mnt/disks/vol2/out.txt
kubectl exec sts01-0 -- cat /data/out.txt
kubectl exec sts01-1 -- cat /data/out.txt
kubectl delete pod sts01-0
kubectl get pod,sc,pv,pvc,sts
