How to run node server using DEBUG command in docker file?

Question

What is the command of the running node server in docker using DEBUG? I tried following commands in dockerfile but no luck.

CMD [ "npm", "DEBUG=* start" ]

CMD [ "DEBUG=*", "npm", "start" ]

I am using debug npm for logging.

Could you please help me?

Set the DEBUG environment car with ENV

Joe
– Joe

2018-12-26 12:45:10 +00:00
Commented Dec 26, 2018 at 12:45 — Joe
– Joe, Commented Dec 26, 2018 at 12:45

grapes · Accepted Answer · 2018-12-26 12:59:35Z

1

According to documentation on npm debug, it requires DEBUG to be an environment variable, like set DEBUG=*,-not_this. In this case you can do it in several ways:

Using ENV command of Dockerfile:

ENV DEBUG * start

or

ENV DEBUG="* start"

If you want to dynamically change the DEBUG variable, you can put it into CMD and override on container start, but in this case you have to follow your OS rules for environment variable definition. For Windows it can be:

CMD ["cmd.exe", "-c", "set DEBUG=* start"]

answered Dec 26, 2018 at 12:59

grapes

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