HostPath with minikube - Kubernetes
Solution 1
EDIT: Looks like the solution is to either use a privilaged container, or to manually mount your home folder to allow the MiniKube VM to read from your hostPath -- https://github.com/boot2docker/boot2docker#virtualbox-guest-additions. (Credit to Eliel for figuring this out).
It is absolutely possible to configure a hostPath volume with minikube - but there are a lot of quirks and there isn't very good support for this particular issue.
Try removing ADD code/ /code
from your Dockerfile. Docker's "ADD" instruction is copying the code from your host machine into your container's /code
directory. This is why rebuilding the image successfully updates your code.
When Kubernetes tries to mount the container's /code
directory to the host path, it finds that this directory is already full of the code that was baked into the image. If you take this out of the build step, Kubernetes should be able to successfully mount the host path at runtime.
Also be sure to check the permissions of the code/
directory on your host machine.
My only other thought is related to mounting in the root directory. I had issues when mounting Kubernetes hostPath volumes to/from directories in the root directory (I assume this was permissions related). So, something else to try would be a mountPath like /var/www/html
.
Here's an example of a functional hostPath volume:
apiVersion: v1
kind: Pod
metadata:
name: example
spec:
volumes:
- name: example-volume
hostPath:
path: '/Users/example-user/code'
containers:
- name: example-container
image: example-image
volumeMounts:
- mountPath: '/var/www/html'
name: example-volume
Solution 2
They have now given the minikube mount
which works on all environment
https://github.com/kubernetes/minikube/blob/master/docs/host_folder_mount.md
Tried on Mac:
$ minikube mount ~/stuff/out:/mnt1/out
Mounting /Users/macuser/stuff/out into /mnt1/out on the minikube VM
This daemon process needs to stay alive for the mount to still be accessible...
ufs starting
And in pod:
apiVersion: v1
kind: Pod
metadata:
name: myServer
spec:
containers:
- name: myServer
image: myImage
volumeMounts:
- mountPath: /mnt1/out
name: volume
# Just spin & wait forever
command: [ "/bin/bash", "-c", "--" ]
args: [ "while true; do sleep 30; done;" ]
volumes:
- name: volume
hostPath:
path: /mnt1/out
Eliel Haouzi
Updated on June 06, 2022Comments
-
Eliel Haouzi almost 2 years
UPDATE: I connected to the minikubevm and I see my host directory mounted but there is no files there. Also when I create a file there it will not in my host machine. Any link are between them
I try to mount an host directory for developing my app with kubernetes.
As the doc recommended, I am using minikube for running my kubernetes cluster on my pc. The goal is to create a develop environment with docker and kubernetes for develop my app. I want to mount a local directory so my docker will read the code app from there. But it is not work. Any help would be really appreciate.
my test app (server.js):
var http = require('http'); var handleRequest = function(request, response) { response.writeHead(200); response.end("Hello World!"); } var www = http.createServer(handleRequest); www.listen(8080);
my Dockerfile:
FROM node:latest WORKDIR /code ADD code/ /code EXPOSE 8080 CMD server.js
my pod kubernetes configuration: (pod-configuration.yaml)
apiVersion: v1 kind: Pod metadata: name: apiserver spec: containers: - name: node image: myusername/nodetest:v1 ports: - containerPort: 8080 volumeMounts: - name: api-server-code-files mountPath: /code volumes: - name: api-server-code-files hostPath: path: /home/<myuser>/Projects/nodetest/api-server/code
my folder are:
/home/<myuser>/Projects/nodetest/ - pod-configuration.yaml - api-server/ - Dockerfile - code/ - server.js
When I running my docker image without the hostPath volume it is of course works but the problem is that on each change I will must recreate my image that is really not powerful for development, that's why I need the volume hostPath.
Any idea ? why i don't success to mount my local directory ?
Thanks for the help.