如何使用python和Java运行Docker? [英] How to run Docker with python and Java?
问题描述
我需要在docker容器中同时使用java和python来运行一些代码。
I need both java and python in my docker container to run some code.
这是我的dockerfile:
如果我不添加 FROM openjdk:slim
This is my dockerfile: It works perpectly if I don't add the FROM openjdk:slim
#get python
FROM python:3.6-slim
RUN pip install --trusted-host pypi.python.org flask
#get openjdk
FROM openjdk:slim
COPY . /targetdir
WORKDIR /targetdir
# Make port 81 available to the world outside this container
EXPOSE 81
CMD ["python", "test.py"]
而test.py应用程序位于同一目录中:
And the test.py app is in the same directory:
from flask import Flask
import os
app = Flask(__name__)
@app.route("/")
def hello():
html = "<h3>Test:{test}</h3>"
test = os.environ['JAVA_HOME']
return html.format(test = test)
if __name__ == '__main__':
app.run(debug=True,host='0.0.0.0',port=81)
我遇到此错误:
D:\MyApps\Docker Toolbox\Docker Toolbox\docker.exe: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "exec: \"python\": executable file not found in $PATH": unknown.
我在这里到底在做什么错?我是Docker的新手,也许我错过了一步。
What exactly am I doing wrong here? I'm new to docker, perhaps I'm missing a step.
其他详细信息
我的目标
我必须运行一个运行Java文件的python程序。我正在使用的python库需要 JAVA_HOME
的路径。
I have to run a python program that runs a Java file. The python library I'm using requires the path to JAVA_HOME
.
我的问题:
-
我不知道Java,因此无法正确运行文件。
I do not know Java, so I cannot run the file properly.
我的整个代码都在Python中,除了这个Java位
My entire code is in Python, except this Java bit
Python包装器以我需要的方式运行文件
The Python wrapper runs the file in a way I need it to run.
推荐答案
好,我花了一些时间才弄清楚。我要感谢这个答案。
OK it took me a little while to figure it out. And my thanks go to this answer.
我认为我的方法没有之所以可以正常工作,是因为我没有基本的Linux版本。
I think my approach didn't work because I did not have a basic version of Linux.
所以它是这样的:
- 获取Linux(我使用Alpine是因为它是准系统)
- 通过包管理器获取Java
- 获取Python,PIP
可选:查找并设置JAVA_HOME
OPTIONAL: find and set JAVA_HOME
- 查找路径JAVA_HOME。也许有更好的方法可以执行此操作,但是我运行了运行容器,然后使用
docker exec -it [COINTAINER ID] bin / bash
并找到了它。 - 在dockerfile中设置
JAVA_HOME
并再次构建并再次运行它
- Find the path to JAVA_HOME. Perhaps there is a better way to do this, but I did this running the running the container, then I looked inside the container using
docker exec -it [COINTAINER ID] bin/bash
and found it. - Set
JAVA_HOME
in dockerfile and build + run it all again
这是最终的Dockerfile(应该与问题中的python代码一起使用):
Here is the final Dockerfile ( it should work with the python code in the question) :
### 1. Get Linux
FROM alpine:3.7
### 2. Get Java via the package manager
RUN apk update \
&& apk upgrade \
&& apk add --no-cache bash \
&& apk add --no-cache --virtual=build-dependencies unzip \
&& apk add --no-cache curl \
&& apk add --no-cache openjdk8-jre
### 3. Get Python, PIP
RUN apk add --no-cache python3 \
&& python3 -m ensurepip \
&& pip3 install --upgrade pip setuptools \
&& rm -r /usr/lib/python*/ensurepip && \
if [ ! -e /usr/bin/pip ]; then ln -s pip3 /usr/bin/pip ; fi && \
if [[ ! -e /usr/bin/python ]]; then ln -sf /usr/bin/python3 /usr/bin/python; fi && \
rm -r /root/.cache
### Get Flask for the app
RUN pip install --trusted-host pypi.python.org flask
####
#### OPTIONAL : 4. SET JAVA_HOME environment variable, uncomment the line below if you need it
#ENV JAVA_HOME="/usr/lib/jvm/java-1.8-openjdk"
####
EXPOSE 81
ADD test.py /
CMD ["python", "test.py"]
我是Docker的新手,所以这可能不是最好的解决方案。我愿意接受建议。
I'm new to Docker, so this may not be the best possible solution. I'm open to suggestions.
更新:常见问题
- 难以使用python软件包
- Difficulty using python packages
以 Joabe Lucena 指出此处,Alpine可能会遇到某些python软件包的问题。
我建议您使用最适合您的Linux发行版,例如美分。
As Joabe Lucena pointed out here, Alpine can have issues certain python packages. I recommend that you use a Linux distro that works best for you, e.g. centos.
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