docker build error in Dockerfile

Question

When I try to run 'docker build .' or 'docker build - < Dockerfile', errors appeared as below:

[root@VM_60_90_centos dtask-ctrip-train-domestic]# docker build .
Sending build context to Docker daemon 38.98 MB 
Step 1 : FROM ubuntu:14.04  ---> 132b7427a3b4 
Step 2 : MAINTAINER Ke Peng<ke.peng@jingli365.com>  ---> Using cache  ---> 
         db9529465f77 
Step 3: WORKDIR /opt/app  ---> Using cache  ---> 3122f40a8e56 
Step 4 :COPY . ./  ---> 4d67a5fbf128 Removing intermediate container
c2d83602f613 
Step 5 : RUN npm  install  ---> Running in 67680232cbdf

/bin/sh: 1: npm: not found The command '/bin/sh -c npm  install'
returned a non-zero code: 127

and my Dockerfile like this:

FROM ubuntu:14.04 
MAINTAINER Ke Peng <ke.peng@jingli365.com> 
WORKDIR /opt/app 
COPY . ./ 
RUN npm  install 
COPY dist/ /opt/app/ 
CMD node ./index.js < test.json

Can anyone have similar experience and give me an solution. Very appreciated!

Answer 1

Try this Dockerfile

FROM ubuntu:14.04 
MAINTAINER Ke Peng <ke.peng@jingli365.com> 
RUN sudo apt-get update
RUN sudo -y apt-get install nodejs
RUN sudo -y apt-get install npm
WORKDIR /opt/app 
COPY . ./ 
RUN npm  install 
COPY dist/ /opt/app/ 
CMD node ./index.js < test.json

Edited as suggested in comments

Answer 2

Try this:

FROM ubuntu:14.04 
MAINTAINER Ke Peng <ke.peng@jingli365.com> 
RUN sudo apt-get update && \
    sudo apt-get install -y nodejs npm

WORKDIR /opt/app 

COPY . ./ 
RUN npm  install 
COPY dist/ /opt/app/ 
CMD node ./index.js < test.json

Answer 3

Try changing the base image to one containing node , such as:

FROM node:6
MAINTAINER Ke Peng <ke.peng@jingli365.com> 
WORKDIR /opt/app 
COPY . ./ 
RUN npm  install 
COPY dist/ /opt/app/ 
CMD node ./index.js < test.json

Note: changed the first line only.

Answer 4

I would like to modify from this :

RUN sudo apt-get update
RUN sudo -y apt-get install nodejs
RUN sudo -y apt-get install npm

to this:

RUN sudo apt-get update && apt-get install -y nodejs npm

and as whole it looks like this:

FROM ubuntu:14.04 
MAINTAINER Ke Peng <ke.peng@jingli365.com> 
RUN sudo apt-get update && apt-get install -y nodejs npm
WORKDIR /opt/app 
COPY . ./ 
RUN npm  install 
COPY dist/ /opt/app/ 
CMD node ./index.js < test.json

As a best practice for Dockerfiles, you need to build/install packages in a single layer.

This will help the Image to be formed using minimal layers which will reduce the overall size of the Image.

Hope this helps.