How to mount a config file from host to container?

General Discussions
1

I am getting an error mounting a config file, can anyone assist?

With subPath on volumeMounts I get the error:
Error: stat /var/config/openhim-console.json: no such file or directory.
I can read this file.

Without subPath on volumeMounts I get this error:
Error: failed to start container “openhim-console”:
Error response from daemon: oci runtime error: container_linux.go:262: starting container process caused “process_linux.go:339: container init caused “rootfs_linux.go:57: mounting \”/var/config/openhim-console.json\” to rootfs \"/var/lib/docker/overlay2/7408e2aa7e93b3c42ca4c2320681f61ae4bd4b02208364eee8da5f51d587ed21/merged\" at \"/var/lib/docker/overlay2/7408e2aa7e93b3c42ca4c2320681f61ae4bd4b02208364eee8da5f51d587ed21/merged/usr/share/nginx/html/config/default.json\" caused \“not a directory\”""
: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type
Warning BackOff 2s kubelet, ip-10-0-65-230.eu-central-1.compute.internal Back-off restarting failed container

My yaml deployment file:
apiVersion: apps/v1
kind: Deployment
metadata:
name: openhim-console-deployment
spec:
replicas: 1
selector:
matchLabels:
component: openhim-console
template:
metadata:
labels:
component: openhim-console
spec:
volumes:
- name: console-config
hostPath:
path: /var/config/openhim-console.json
containers:
- name: openhim-console
image: jembi/openhim-console:1.13.rc
ports:
- containerPort: 80
volumeMounts:
- name: console-config
mountPath: /usr/share/nginx/html/config/default.json
subPath: default.json
env:
- name: NODE_ENV
value: development

2

I think the important part of the error is this one:

caused \“not a directory\”""
: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type

What if you use a directory?

1 Like
3

Thanks, that was my issue, just needed to mount the directory.

Appreciate the help!

1 Like
4

Glad it worked! :slight_smile:

5

Hi Rata,

I have another very strange thing with this topic. I am able for this to work 100% using Minikube and Virtualbox to a shared volume but I am having an impossible time on Linux.

Do you know if there are any special permissions needed for the files to be visible? I have run this on the directory I use /var/config/openhim-console

sudo chmod -R a+rwx /var/config but still I am unable to see these files from the container?

Any ideas?

6

Do you see errors? Do logs shoe anything?

Do you see the file and can’t read it or you don’t see it? Does it work if you use a directory in /tmp?

7

Thanks Rata,

It is bizzare to be honest. So the exact same json config file runs on minikube but here is what I get on the Linux instance. This is AWS Linux Bastion server.

chmod a+rw /var/config -R

Error: Error parsing your configuration file: [/usr/src/app/config/development.json]:  **EISDIR: illegal operation on a directory, read**

    at exports.File.File.loadSync (/usr/src/app/node_modules/nconf/lib/nconf/stores/file.js:170:11)

    at exports.Provider.Provider.add (/usr/src/app/node_modules/nconf/lib/nconf/provider.js:136:23)

    at exports.Provider.Provider.file (/usr/src/app/node_modules/nconf/lib/nconf/provider.js:63:15)

    at new Config (/usr/src/app/lib/config/config.js:55:21)

    at Object.<anonymous> (/usr/src/app/lib/config/config.js:72:33)

    at Module._compile (internal/modules/cjs/loader.js:701:30)

    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)

    at Module.load (internal/modules/cjs/loader.js:600:32)

    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)

    at Function.Module._load (internal/modules/cjs/loader.js:531:3)

    at Module.require (internal/modules/cjs/loader.js:637:17)

    at require (internal/modules/cjs/helpers.js:22:18)

    at Object.<anonymous> (/usr/src/app/lib/config/index.js:7:15)

    at Module._compile (internal/modules/cjs/loader.js:701:30)

    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)

    at Module.load (internal/modules/cjs/loader.js:600:32)

if I use chmod 777 /var/config -R

Error: Error parsing your configuration file: [/usr/src/app/config/development.json]:  **Unexpected end of JSON input**

    at exports.File.File.loadSync (/usr/src/app/node_modules/nconf/lib/nconf/stores/file.js:170:11)

    at exports.Provider.Provider.add (/usr/src/app/node_modules/nconf/lib/nconf/provider.js:136:23)

    at exports.Provider.Provider.file (/usr/src/app/node_modules/nconf/lib/nconf/provider.js:63:15)

    at new Config (/usr/src/app/lib/config/config.js:55:21)

    at Object.<anonymous> (/usr/src/app/lib/config/config.js:72:33)

    at Module._compile (internal/modules/cjs/loader.js:701:30)

    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)

    at Module.load (internal/modules/cjs/loader.js:600:32)

    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)

    at Function.Module._load (internal/modules/cjs/loader.js:531:3)

    at Module.require (internal/modules/cjs/loader.js:637:17)

    at require (internal/modules/cjs/helpers.js:22:18)

    at Object.<anonymous> (/usr/src/app/lib/config/index.js:7:15)

    at Module._compile (internal/modules/cjs/loader.js:701:30)

    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)

    at Module.load (internal/modules/cjs/loader.js:600:32)

Is it possible that a module like nconf are unable to read the file due to permissions?

8

Using tmp does not work either.

9

Sorry, I don’t follow. Where are those logs from? Running what?

It seems something at the application level, not kubernetes. Right? Can you please provide more context?

10

Hi Rata,

Thanks for the help, I managed to resolve it, I posted the problem and solution here. It was due to me not being on the right server.

Appreciate your assistance.

11

Great, thanks for sharing! :slight_smile: