Nextjs fails to find valid build in the '.next' directory in production node_env

Question

I am running my app in docker, but my production build and start script fails only in docker environment. Although node_env development works well in docker environment.

Here is my script that fails to make a production build and start a server. I am using nodemon and babel

"build:prod": {       "command": "babel ./src/server/ -d server --presets es2015,stage-2 && next build src",       "env": {         "NODE_ENV": "production"       }     },     "start:prod": {       "command": "PORT=3000 nodemon --watch ./src/server/ ./src/server/server.js --exec babel-node --presets es2015,stage-2",       "env": {         "NODE_ENV": "production"       }     } 

But when I give same command in docker environment:

FROM node:8-alpine  COPY package.json /tmp/package.json  RUN cd /tmp && npm install  RUN mkdir -p /opt/app && cp -a /tmp/node_modules /opt/app  WORKDIR /opt/app  ADD . /opt/app  RUN npm run build:prod  EXPOSE 3000  CMD ["npm", "run", "start:prod"] 

I get the following error in docker:

 > better-npm-run start:prod site_1      |  site_1      | running better-npm-run in /opt/app site_1      | Executing script: start:prod site_1      |  site_1      | to be executed: PORT=3000 NODE_ENV=production nodemon --watch ./src/server/ ./src/server/server.js --exec babel-node --presets es2015,stage-2  site_1      | [nodemon] 1.17.3 site_1      | [nodemon] to restart at any time, enter `rs` site_1      | [nodemon] watching: /opt/app/src/server/**/* site_1      | [nodemon] starting `babel-node ./src/server/server.js --presets es2015,stage-2` site_1      | false 'production' site_1      | > Could not find a valid build in the '.next' directory! Try building your app with 'next build' before starting the server. site_1      | [nodemon] app crashed - waiting for file changes before starting... 

I would appreciate any help and would be nice to know what I am doing wrong.

Answer 1

You need to make sure the .next directory is not being copied from your host

ADD . /opt/app 

Will also add the .next directory you had on host. I would add .dockerignore and add .next to the same. And then build and run again