我想做什么
我正在尝试使用Docker Compose创建开发环境。
我将创建以下容器：
我将首先开始使python容器正常工作。
当我只使用python时，我的python容器保持运行Dockerfile。但是，当我使用docker-compose.yml文件时，该容器立即退出。我希望它继续运行。我究竟做错了什么？提前致谢。
app(develop) $ docker --version
Docker version 20.10.3, build 48d30b5
app(develop) $ docker-compose --version
docker-compose version 1.28.2, build 67630359
我首先创建了一个 Dockerfile.python
# Set base image (host OS)
FROM python:3.9-slim-buster
# Run apt update and upgrade and install as necessary.
RUN apt update; \
apt upgrade -y --no-install-recommends; \
apt install python3-pip -y; \
apt autoremove -y; \
rm -vfr /var/lib/apt/lists/*
# Set the working directory in the container.
RUN mkdir -v /code
WORKDIR /code
# Command to run on container start
CMD ["/bin/bash"]
我能够成功构建容器。
app(develop) $ ls -laR
total 32
drwxrwxr-x 5 mike mike 4096 Feb 3 22:18 .
drwxrwxr-x 4 mike mike 4096 Feb 1 13:51 ..
-rw-rw-r-- 1 mike mike 3357 Feb 3 22:08 docker-compose.yml
-rw-rw-r-- 1 mike mike 3070 Feb 3 22:18 Dockerfile.python
drwxrwxr-x 8 mike mike 4096 Feb 3 21:04 .git
drwxrwxr-x 2 mike mike 4096 Jan 31 15:01 src
./src:
total 16
drwxrwxr-x 2 mike mike 4096 Jan 31 15:01 .
drwxrwxr-x 5 mike mike 4096 Feb 3 22:18 ..
-rw-rw-r-- 1 mike mike 178 Jan 31 15:01 script.py
app(develop) $ docker build --tag my/python:0.1 \
> --file Dockerfile.python \
> .
blah, blah, blah
Successfully tagged my/python:0.1
app(develop) $ docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
my/python 0.1 9ad1a86c619c About a minute ago 510MB
python 3.9-slim-buster 677f7ac99e48 9 days ago 114MB
我能够成功创建并启动容器。
app(develop) $ docker run --name my-python \
> --mount 'type=bind,source=/home/mike/my-python-projects/app,destination=/code/' \
> --hostname=python-dev-cont \
> --interactive --tty --detach \
> my/python:0.1
3a29eaa6955dac3d1aaf6a27f80c2f6518fd788f2d0ed88a76797932842176ec
app(develop) $ docker container ls --all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3a29eaa6955d my/python:0.1 "/bin/bash" 13 seconds ago Up 12 seconds my-python
app(develop) $ docker exec --interactive --tty my-python /bin/bash
[email protected]:
[email protected]:/code# python --version
Python 3.9.1
[email protected]:/code# pip3 --version
pip 21.0 from /usr/local/lib/python3.9/site-packages/pip (python 3.9)
[email protected]:/code# python src/script.py
Hello World from Python!!!
x is: 4
That's all folks!
[email protected]:/code# exit
exit
app(develop) $ docker container stop my-python
my-python
app(develop) $ docker container rm my-python
my-python
app(develop) $ docker container ls --all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
到目前为止一切都很好。
由于我将拥有如上所述的其他容器，因此我想使用Docker Compose，以便这些容器可以一起工作。
这是代码 docker-compose.yml
version: "3.8"
# =============================================================================
# docker container create
# =============================================================================
services:
# -----------------------------------------------------------------------------
python:
# -----------------------------------------------------------------------------
container_name: "my-python"
build:
context: "."
dockerfile: "Dockerfile.python"
image: "my/python:0.1"
hostname: "python-dev-cont"
volumes:
- type: bind
source: .
target: /code/
当我使用以下命令时，将创建，启动并立即退出容器。
app(develop) $ docker-compose up --build --detach
Building with native build. Learn about native build in Compose here: https://docs.docker.com/go/compose-native-build/
Building python
Sending build context to Docker daemon 80.9kB
Step 1/5 : FROM python:3.9-slim-buster
---> 677f7ac99e48
Step 2/5 : RUN apt update; apt upgrade -y --no-install-recommends; apt install python3-pip -y; apt autoremove -y; rm -vfr /var/lib/apt/lists/*
---> Using cache
---> 3be88973dbbc
Step 3/5 : RUN mkdir -v /code
---> Using cache
---> 91d715fef9d4
Step 4/5 : WORKDIR /code
---> Using cache
---> b746571615f7
Step 5/5 : CMD ["/bin/bash"]
---> Using cache
---> df09d2624564
Successfully built df09d2624564
Successfully tagged my/python:0.1
Creating my-python ... done
app(develop) $ docker container ls --all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b2dbaffe179d my/python:0.1 "/bin/bash" 21 seconds ago Exited (0) 20 seconds ago my-python
我期望容器仅使用时就可以运行Dockerfile.python。我究竟做错了什么？我正在使用相同的Dockerfile.python。
那是因为您的映像定义为bash在命令中运行，这需要交互模式。
您可以添加stdin_open+tty来防止容器终止，但是您仍然必须这样exec做才能获取命令行，因为docker-compose流出了日志。
version: "3.8"
# =============================================================================
# docker container create
# =============================================================================
services:
# -----------------------------------------------------------------------------
python:
# -----------------------------------------------------------------------------
container_name: "my-python"
build:
context: "."
dockerfile: "Dockerfile.python"
image: "my/python:0.1"
hostname: "python-dev-cont"
stdin_open: true
tty: true
volumes:
- type: bind
source: .
target: /code/
您也可以使用 docker-compose run my-python
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我来说两句