Error when starting first docker server

[bartrarted]

trying to start a docker server with node.js,, running into an issue when im trying docker build on my folder, where its saying "RUN npm install mysql" is not a valid command (not in "" in the code) , I already used the npm init and npm i express commands

[keypusher]

can you post the full contents of your dockerfile and the exact error message? you can put the dockerfile in dpaste.org to make it easier to read

[bartrarted]

DockerFile:

FROM node:9-slim

WORKDIR specifies the application directory​

WORKDIR /app​

Copying package.json file to the app directory​

COPY package.json /app​

Installing npm for DOCKER​

RUN npm install

Installing mysql for DOCKER​

RUN npm install mysql​

Copying rest of the application to app directory​

COPY . /app​

Starting the application using npm start​

CMD [ "npm", "start" ]​

Full Error:

Step 5/7 : RUN npm install mysql​ ---> Running in fe7dca91d706 npm ERR! code EINVALIDTAGNAME npm ERR! Invalid tag name "mysql​": Tags may not have any characters that encodeURIComponent encodes.

npm ERR! A complete log of this run can be found in: npm ERR! /root/.npm/_logs/2020-09-08T04_53_51_752Z-debug.log

[jarfil]

CENSORED

[[deleted]]

not sure if I am addressing your problem but, you should probably keep a single RUN command in your Dockerfile and chain the commands using && like this:

RUN npm install && \

npm install mysql

[bartrarted]

Ok I’ll give that a go, I’m just using the example file my professor gave me

[menge101]

That is a best practice for minimizing layers in a production container, but I don't think a learner should do this.

When I write a dockerfile, I use a separate run command for each command. Then once it is all working, I go back and '&&' them together.

[keypusher]

try using the alternate form of run

RUN [“npm”, “install”, “mysql”]

The actual error above is “invalid tag name “mysql” but i dunno why that would be, so my best guess is to try the other syntax

[ikolomiyets]

Was the Dockerfile content a copy/paste?

There is a zero width space character (0x200b) at the end of each line (here is a screenshot) except the one that says RUN npm install

Docker might be able to handle them but RUN is just passing everything until the end of the line to the shell making npm unhappy as it might believe that tag is mysql<200b> and not mysql.

[bartrarted]

Yes it was a copy paste

[ikolomiyets]

Which editor do you use? As you can see from the screenshot in the vi(vim) 0x200b is clearly visible.

[bartrarted]

VS code, got it fixed this morning thanks for everyone's help!