docker build with --build-arg with multiple arguments
DockerBuildArgumentsDocker Problem Overview
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?
Docker Solutions
Solution 1 - Docker
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 .
Solution 2 - Docker
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.
Solution 3 - Docker
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
Solution 4 - Docker
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 per one line.
Solution 5 - Docker
In case you want to pass automatically build arguments from a specific file, you can do it this way :
docker build $(cat .my-env-file-name | while read line; do out+="--build-arg $line"; done; echo $out; out="") .
Solution 6 - Docker
A way to pass in build arguments from a file using xargs is as follows:
cat .MY_ENV_FILE | xargs printf -- '--build-arg %s\n' | xargs docker build -t MY_TAG .