docker build with --build-arg with multiple arguments

Question

According to the documentation  it s possible to define multiple args for the flag --build-arg  but I can t find out how  I tried the following   docker build -t essearch ess-elasticsearch 1 7 6 --build-arg number of shards 5 number of replicas 2 --no-cache        This returns an error   I also tried   docker build -t essearch ess-elasticsearch 1 7 6 --build-arg number of shards 5 number of replicas 2 --no-cache        This sets one variable  number of shards  to the value  5 number of replicas 2   Any idea how I can define multiple arguments

User · Answer

If you want to use environment variable during build. Lets say setting username and password.

username= Ubuntu
password= swed24sw

Dockerfile

FROM ubuntu:16.04
ARG SMB_PASS
ARG SMB_USER
# Creates a new User
RUN useradd -ms /bin/bash $SMB_USER
# Enters the password twice.
RUN echo "$SMB_PASS\n$SMB_PASS" | smbpasswd -a $SMB_USER

Terminal Command

docker build --build-arg SMB_PASS=swed24sw --build-arg SMB_USER=Ubuntu . -t IMAGE_TAG

User · Answer

The above answer by pl rock is correct  the only thing I would add is to expect the ARG inside the Dockerfile if not you won t have access to it  So if you are doing   docker build -t essearch ess-elasticsearch 1 7 6 --build-arg number of shards 5 --build-arg number of replicas 2 --no-cache     Then inside the Dockerfile you should add  ARG number of replicas ARG number of shards   I was running into this problem  so I hope I help someone  myself  in the future

User · Answer

Use --build-arg with each argument   If you are passing two argument then add --build-arg with each argument like   docker build   -t essearch ess-elasticsearch 1 7 6   --build-arg number of shards 5   --build-arg number of replicas 2   --no-cache

User · Answer

It s a shame that we need multiple ARG too  it results in multiple layers and slows down the build because of that  and for anyone also wondering that  currently there is no way to set multiple ARGs

[docker] docker build with --build-arg with multiple arguments

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