【Kubernetes】ボリュームでsubPathを使ってみる

1apiVersion: v1
2kind: Pod
3metadata:
4  name: sample-subpath
5spec:
6  containers:
7  - name: busybox
8    image: busybox:latest
9    args:
10      - sleep
11      - "999"
12    volumeMounts:
13    - mountPath: /tmp
14      name: volume-subpath
15      subPath: busybox # ボリュームの中にbusyboxというディレクトリができる
16  volumes:
17  - name: volume-subpath
18    persistentVolumeClaim:
19      claimName: pvc-vol

1apiVersion: v1
2kind: PersistentVolume
3metadata:
4  name: pv-vol
5spec:
6  capacity:
7    storage: 1Gi
8  accessModes:
9  - ReadWriteMany
10  persistentVolumeReclaimPolicy: Delete
11  storageClassName: manual
12  hostPath:
13    path: /tmp
14    type: Directory
15---
16apiVersion: v1
17kind: PersistentVolumeClaim
18metadata:
19  name: pvc-vol
20spec:
21  resources:
22    requests:
23      storage: 1Gi
24  accessModes:
25  - ReadWriteMany
26  storageClassName: manual

1kubectl apply -f volume.yml

1apiVersion: v1
2kind: Pod
3metadata:
4  name: sample-subpath
5spec:
6  containers:
7  - name: container1
8    image: busybox:latest
9    args:
10      - sleep
11      - "999"
12    volumeMounts:
13    - mountPath: /tmp
14      name: volume-subpath
15      subPath: container1 # ボリュームのcontainer1にマウント
16  - name: container2
17    image: busybox:latest
18    args:
19      - sleep
20      - "999"
21    volumeMounts:
22    - mountPath: /tmp
23      name: volume-subpath
24      subPath: container2 # ボリュームのcontainer2にマウント
25  - name: container3
26    image: busybox:latest
27    args:
28      - sleep
29      - "999"
30    volumeMounts:
31    - mountPath: /tmp # subPathを使わずマウント
32      name: volume-subpath
33  volumes:
34  - name: volume-subpath
35    persistentVolumeClaim:
36      claimName: pvc-vol

1kubectl apply -f pod.yml

1❯ kubectl exec -it sample-subpath -c container1 -- /bin/sh
2
3/ # ls /tmp
4

1❯ kubectl exec -it sample-subpath -c container3 -- /bin/sh
2
3/ # ls /tmp
4container1  container2