How to set environment variables in Dockerfile via Azure DevOps

Question

In my projects Docker file I have some environment variables, like this:

ENV ACCEPT_EULA=Y
ENV SA_PASSWORD=Password
ENV MSSQL_PID=Developer
ENV MSSQL_TCP_POR         


        

Answer 1

You can set an ARG var_name and reference ENV to the ARG variables. Then you can replace those variables when docker build the image $ docker build --build-arg var_name=$(VARIABLE_NAME)

For example the add ARG in dockerfile, and have the ENV variable refer to it:

ARG SECRET
ENV ACCEPT_EULA=Y
ENV SA_PASSWORD=$SECRET
ENV MSSQL_PID=Developer
ENV MSSQL_TCP_PORT=1433 

You can use dock build task and dock push task separately, as buildandpush command cannot accept arguments. And set a variable SECRET in your pipeline.

The set the Build Arguments SECRET= $(SECRET) to replace the ARG SECRET

You can also refer to a similar thread.