我正在尝试使用自定义环境变量构建Oracle WebLogic Docker镜像
$docker build -t 12213-domain --build-arg ADMIN_PORT=8888 --build-arg ADMIN_PASSWORD=wls .
但是我在构建日志中收到以下警告
[Warning] One or more build-args [ADMIN_PASSWORD ADMIN_PORT] were not consumed
这是我正在尝试构建的图像的Dockerfile
#Copyright (c) 2014-2017 Oracle and/or its affiliates. All rights reserved.
#
#Licensed under the Universal Permissive License v 1.0 as shown at http://oss.oracle.com/licenses/upl.
#
# ORACLE DOCKERFILES PROJECT
# --------------------------
# This Dockerfile extends the Oracle WebLogic image by creating a sample domain.
#
# Util scripts are copied into the image enabling users to plug NodeManager
# automatically into the AdminServer running on another container.
#
# HOW TO BUILD THIS IMAGE
# -----------------------
# Put all downloaded files in the same directory as this Dockerfile
# Run:
# $sudo docker build -t 12213-domain
#
# Pull base image
# ---------------
FROM oracle/weblogic:12.2.1.3-developer
# Maintainer
# ----------
MAINTAINER Monica Riccelli
我正在Windows上运行docker-toolbox,而docker版本则是
$docker --version
Docker version 18.03.0-ce,build 0520e24302
ARG
ARG
The ARG instruction defines a variable that users can pass at
build-time to the builder with the docker build command using the
–build-arg = flag. If a user specifies a build argument that was not defined in the Dockerfile,the build outputs a
warning.
[Warning] One or more build-args [foo] were not consumed.
https://docs.docker.com/engine/reference/builder/#arg
使用ARG变量
You can use an ARG or an ENV instruction to specify variables that are
available to the RUN instruction. Environment variables defined using
the ENV instruction always override an ARG instruction of the same
name. Consider this Dockerfile with an ENV and ARG instruction.
Unlike an ARG instruction,ENV values are always persisted in the
built image. Consider a docker build without the –build-arg flag:
ARG仅在构建Docker镜像(RUN等)时可用,而不是在创建图像并从中启动容器(ENTRYPOINT,CMD)之后.您可以使用ARG值来设置ENV值以解决此问题.
所以你需要做这样的事情
# Assign any default value to avoid any error. do not worry your build flag will override this.
ARG ADMIN_PORT=some_default_value
ENV ADMIN_PORT=${ADMIN_PORT}
https://vsupalov.com/docker-arg-env-variable-guide/
