k8s subPathExpr作用

场景：

对于一个deployment或者job拉起的服务，所有pod都是一样的配置，如果都挂载了宿主机的同一个目录，那么就会互相干扰，我们希望挂载相同目录，且在这个目录下，每个pod建立一个自己的目录，去写入自己的东西

使用subPathExpr

apiVersion: batch/v1
kind: Job
metadata:name: subpath-jobslabels:name: subpath-jobs
spec:completions: 5parallelism: 5backoffLimit: 0template:spec:restartPolicy: "Never"containers:- name: busyboximage: busyboxworkingDir: /outputscommand: [ "touch" ]args: [ "a_file.txt" ]env:- name: POD_NAMEvalueFrom:fieldRef:apiVersion: v1fieldPath: metadata.name     volumeMounts:- name: job-outputmountPath: /outputssubPathExpr: $(POD_NAME)volumes:- name: job-outputhostPath:path: /data/outputstype: DirectoryOrCreate

效果：

# ls -R /data
/data:
outputs/data/outputs:
subpath-jobs-6968q  subpath-jobs-6zp4x  subpath-jobs-nhh96  subpath-jobs-tl8fx  subpath-jobs-w2h9f/data/outputs/subpath-jobs-6968q:
a_file.txt/data/outputs/subpath-jobs-6zp4x:
a_file.txt/data/outputs/subpath-jobs-nhh96:
a_file.txt/data/outputs/subpath-jobs-tl8fx:
a_file.txt/data/outputs/subpath-jobs-w2h9f:
a_file.txt