Unable to mount volume in azure app service?

Question

I am trying to deploy a Node SDK on azure app service through docker container. In my sdk, I have mounted a connection file & written a docker-compose for this. But when I deploy it by azure I get below error.

InnerException: Docker.DotNet.DockerApiException, Docker API responded with status code=InternalServerError, response={"message":"invalid volume specification: ':/usr/src/app/connection.json'"}

docker-compose.yml

version: '2'

services:
  node:
    container_name: node
    image: dhiraj1990/node-app:latest
    command: [ "npm", "start" ]
    ports:
      - "3000:3000"
    volumes:
      - ${WEBAPP_STORAGE_HOME}/site/wwwroot/connection.json:/usr/src/app/connection.json

connection.json is present at this path /site/wwwroot.

Dockerfile

FROM node:8

# Create app directory
WORKDIR /usr/src/app

# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./

RUN npm install
# If you are building your code for production
# RUN npm ci --only=production

# Bundle app source
COPY . .

EXPOSE 3000

Please tell me what is the issue ?

Charles Xu · Accepted Answer · 2019-08-14T06:01:55.123

10

Update:

The problem is that you cannot mount a file to the persistent storage, it should be a directory. So the correct volumes should set like below:

volumes:
      - ${WEBAPP_STORAGE_HOME}/site/wwwroot:/usr/src/app

And you also need to enable the persistent storage in your Web app for the container by setting the environment variable WEBSITES_ENABLE_APP_SERVICE_STORAGE=TRUE. For more details, see Add persistent storage.

The persistent storage is just used to persist your data from your container. And if you want to share your files to the container, I will suggest you mount the Azure File share to the container. But you need to pay attention to the caution here:

Linking an existing directory in a web app to a storage account will delete the directory contents.

So you need to mount the Azure File Share to a new directory without necessary files. And you can get more details about the steps in Configure Azure Files in a Container on App Service. It not only supports Windows containers but also supports Linux containers.

edited Aug 14 '19 at 06:01

answered Aug 13 '19 at 06:42

Charles Xu

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Still getting issue InnerException: Docker.DotNet.DockerApiException, Docker API responded with status code=InternalServerError, response={"message":"invalid volume specification: ':/usr/src/app'"} – TechChain Aug 13 '19 at 06:56
@DhirajKumar Do you run a Linux image? Can you enable the persistent storage in the environment variable? – Charles Xu Aug 13 '19 at 06:57
I chose linux while creating app service – TechChain Aug 13 '19 at 07:01
@DhirajKumar Can you share your Dockerfile for the image you use? – Charles Xu Aug 13 '19 at 07:03
check docker file – TechChain Aug 13 '19 at 07:09
@DhirajKumar It seems no error in the Dockerfile, and when you change the docker-compose into what I said, then it also no problem. Two more questions, can you run it well locally? Do you enable persistent storage in the web app environment variable? – Charles Xu Aug 13 '19 at 07:19
I am able to run docker-compose file locally. but in that file path is different – TechChain Aug 13 '19 at 07:23
@DhirajKumar What do you mean the file path is different? – Charles Xu Aug 13 '19 at 07:29
localpath - ./connection.json:/usr/src/app – TechChain Aug 13 '19 at 07:33
@DhirajKumar I think it will overwrite the files in /use/src/app if you use the volumes like `./connection.json:/usr/src/app`. – Charles Xu Aug 13 '19 at 07:43
@DhirajKumar How do you deploy the file to Azure? – Charles Xu Aug 13 '19 at 07:45
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/197856/discussion-between-charles-xu-and-dhiraj-kumar). – Charles Xu Aug 13 '19 at 07:46
Kindly update your answer with steps for creating persistent storage.I had to create persistent storgae to get this done. – TechChain Aug 14 '19 at 05:05
@DhirajKumar Well, I will update the answer. Do you mean to mount the Azure File share steps? Or just the persistent storage? – Charles Xu Aug 14 '19 at 05:21
all steps so that a user can get better idea – TechChain Aug 14 '19 at 05:49
this solutions dosen't work to me , i'am not able to start the container – Quentin Merlin Jun 17 '21 at 19:48

Unable to mount volume in azure app service?

1 Answers1