k8s subpath
参考:https://www.cnblogs.com/gdut1425/p/13112176.html
一.使用场景一
一个pod中有多个容器挂载不同目录或者一个容器挂载不同目录,但只使用了一个volumes的情况
- 因为volumeMounts都使用了data-volume,当在/ttt下新建文件,/home2下也会出现相同文件,相当于都使用了/vvv/dd下的,没有数据隔离
- 解决方法:加上subPath,会在/vvv/dd下生成mn和nn两个文件夹,用来分别对应/ttt和/home2下的数据
apiVersion: v1
kind: Pod
metadata:
name: busybox
namespace: default
spec:
hostNetwork: true
containers:
- name: busybox
image: busybox:1.34
command: ["/bin/sh","-c","touch /ttt/a.txt;sleep 36000"]
imagePullPolicy: IfNotPresent
volumeMounts:
- mountPath: /ttt
name: data-volume
#subPath: mn
- mountPath: /home2
name: data-volume
#subPath: nn
volumes:
- name: data-volume
hostPath:
path: /vvv/dd
type: DirectoryOrCreate
restartPolicy: Always
二.使用场景二
不想覆盖pod中目录,只想改变某个文件,用configmap+subpath
创建configmap:kubectl create configmap nginxconf --from-file=/root/nginx.conf
piVersion: apps/v1
kind: Deployment
metadata:
labels:
app: nginx
name: ssx-nginx-dm
spec:
replicas: 1
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: ssx-nginx-c
image: nginx:1.17.1
imagePullPolicy: IfNotPresent
ports:
- containerPort: 80
volumeMounts:
- name: volume
#须写绝对路径,这样不会覆盖/etc/nginx目录,只会覆盖nginx.conf
#如果写相对路径,且不加subpath会覆盖/etc/nginx目录
mountPath: /etc/nginx/nginx.conf
subPath: nginx.conf #文件名称
volumes:
- name: volume
configMap:
name: nginxconf