Volume mounts not working Kubernetes and WSL 2 and Docker - windows

Question

I am unable to properly mount volumes using HostPath within Kubernetes running in Docker and WSL 2. This seems to be a WSL 2 issue when mounting volumes in Kubernetes running in Docker. Anyone know how to fix this?
Here are the steps:
Deploy debug build to Kubernetes for my app.
Attach Visual Studio Code using the Kubernetes extension
Navigate to the project folder for my application that was attached using the volume mount <= Problem Right Here
When you go and look at the volume mount nothing is there.
C:\Windows\System32>wsl -l -v
NAME STATE VERSION
Ubuntu Running 2
docker-desktop-data Running 2
docker-desktop Running 2
Docker Desktop v2.3.0.3
Kubernetes v1.16.5
Visual Studio Code v1.46.1
====================================================================
Dockerfile
====================================================================
#
# Base image for deploying and running based on Ubuntu
#
# Support ASP.NET and does not include .NET SDK or NodeJs
#
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-bionic AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443
#
# Base image for building .NET based on Ubuntu
#
# 1. Uses .NET SDK image as the starting point
# 2. Restore NuGet packages
# 3. Build the ASP.NET Core application
#
# Destination is /app/build which is copied to /app later on
#
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-bionic AS build
WORKDIR /src
COPY ["myapp.csproj", "./"]
RUN dotnet restore "./myapp.csproj"
COPY . .
WORKDIR "/src/."
RUN dotnet build "myapp.csproj" -c Release -o /app
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-bionic AS debug
RUN curl --silent --location https://deb.nodesource.com/setup_12.x | bash -
RUN apt-get install --yes nodejs
ENTRYPOINT [ "sleep", "infinity" ]
#
# Base image for building React based on Node/Ubuntu
#
# Destination is /app/ClientApp/build which is copied to /clientapp later
#
# NOTE: npm run build puts the output in the build directory
#
FROM node:12.18-buster-slim AS clientbuild
WORKDIR /src
COPY ./ClientApp /app/ClientApp
WORKDIR "/app/ClientApp"
RUN npm install
RUN npm run build
#
# Copy clientbuild:/app/ClientApp to /app/ClientApp
#
# Copy build:/app to /app
#
FROM base as final
WORKDIR /app/ClientApp
COPY --from=clientbuild /app/ClientApp .
WORKDIR /app
COPY --from=build /app .
ENTRYPOINT ["dotnet", "myapp.dll"]
====================================================================
Kubernetes Manifest
====================================================================
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp
spec:
selector:
matchLabels:
app: myapp
replicas: 1
template:
metadata:
labels:
app: myapp
spec:
containers:
- name: myapp
image: localhost:6000/myapp
ports:
- containerPort: 5001
securityContext:
privileged: true
volumeMounts:
- mountPath: /local
name: local
resources: {}
volumes:
- name: local
hostPath:
path: /C/dev/myapp
type: DirectoryOrCreate
hostname: myapp
restartPolicy: Always
---
apiVersion: v1
kind: Service
metadata:
name: myapp
spec:
type: LoadBalancer
ports:
- name: http
protocol: TCP
port: 5001
targetPort: 5001
selector:
app: myapp

Answer 1

According to the following thread, hostPath volumes are not officially supported for wsl2, yet. They do suggest a workaround, though I had trouble getting it to work. I have found that prepending /run/desktop/mnt/host/c seems to work for me.
// C:\someDir\volumeDir
hostPath:
path: /run/desktop/mnt/host/c/someDir/volumeDir
type: DirectoryOrCreate
Thread Source: https://github.com/docker/for-win/issues/5325
Suggested workaround from thread: https://github.com/docker/for-win/issues/5325#issuecomment-567594291

Answer 2

Using #RyanDarnell's excellent answer above, here is what worked for me
Objective: get message-db with password using docker build --secret running in local docker-desktop kubernetes with StatefulSet and StorageClass using Skaffold
$kubectl get nodes -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
docker-desktop Ready control-plane,master 21h v1.21.1 <internalip> <none> Docker Desktop 5.4.72-microsoft-standard-WSL2 docker://20.10.7
#./k8s/storage-class.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: local-storage
labels:
app: postgres-database
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer
reclaimPolicy: Delete
#./k8s/persistent-volume.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: local-pv1
labels:
app: postgres-database
spec:
capacity:
storage: 128Mi
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Retain
storageClassName: local-storage
local:
path: /run/desktop/mnt/host/c/kubernetes-mount-path # created this folder at C:\kubernetes-mount-path
nodeAffinity:
required:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- docker-desktop
#./k8s/stateful-set.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: postgres-database
spec:
selector:
matchLabels:
app: postgres-database
serviceName: postgres-service
replicas: 1
template:
metadata:
labels:
app: postgres-database
spec:
containers:
- name: message-db-container
image: message-db-test
volumeMounts:
- name: postgres-disk
mountPath: /var/lib/postgresql/data
env:
- name: PGDATA
value: /var/lib/postgresql/data/pgdata
- name: POSTGRES_PASSWORD
value: <postgres-password>
volumeClaimTemplates:
- metadata:
name: postgres-disk
labels:
app: postgres-database
spec:
selector:
matchLabels:
app: postgres-database
storageClassName: local-storage
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 128Mi
#./k8s/service.yaml
apiVersion: v1
kind: Service
metadata:
name: postgres-loadbalancer
spec:
selector:
app: postgres-database
type: LoadBalancer
ports:
- port: 5432
targetPort: 5432
#./Dockerfile
# syntax = docker/dockerfile:1.3
FROM postgres:13.3-alpine3.14
RUN apk add --no-cache curl tar
RUN mkdir -p /usr/src/eventide \
&& curl -L https://github.com/message-db/message-db/tarball/v1.2.6 -o /usr/src/eventide/message-db.tgz
RUN tar -xf /usr/src/eventide/message-db.tgz --directory /usr/src/eventide
# change message_store login password
RUN --mount=type=secret,id=message-db-pass sed -i "s/WITH LOGIN/WITH LOGIN ENCRYPTED PASSWORD '$(cat /run/secrets/message-db-pass)'/g" /usr/src/eventide/message-db-message-db-759a4f3/database/roles/message-store.sql
RUN echo -e "#!/bin/sh\ncd /usr/src/eventide/message-db-message-db-759a4f3/database\n./install.sh" > /docker-entrypoint-initdb.d/rundbscripts.sh
RUN docker-entrypoint.sh postgres --version
ENTRYPOINT docker-entrypoint.sh postgres
#./secret.txt
<postgres-password>
#./skaffold.yaml
kind: Config
apiVersion: skaffold/v2beta20
build:
artifacts:
- image: message-db-test
context: .
docker:
secret:
id: message-db-pass
src: secret.txt
local:
useBuildkit: true
deploy:
kubectl:
manifests:
- k8s/*.yaml
run skaffold debug -v debug to startup