无法创建 /etc/nginx/nginx.conf: 目录不存在并且启动容器导致“exec:\\”supervisord\\“:executable file not found in $PATH”

Question

I am building docker image to deploy flask app with uwsgi/nginx.

Here are relevant file for to create a docker container for same

Dockerfile content

FROM python:3.6

MAINTAINER Dockerfiles

RUN mkdir /trell-ds-framework
WORKDIR /trell-ds-framework
ADD . /trell-ds-framework/
RUN python setup.py bdist_wheel
# install uwsgi now because it takes a little while
RUN pip3 install uwsgi
# copy over our requirements.txt file
# upgrade pip and install required python packages
RUN pip3 --no-cache-dir install -U pip
RUN apt-get install -y ca-certificates
RUN apt-get update && apt-get -y install cron
RUN pip3 --no-cache-dir install -r requirements.txt
RUN python -c "import nltk;nltk.download('stopwords')"
# setup all the configfiles
RUN echo "daemon off;" >> /etc/nginx/nginx.conf
COPY nginx_app.conf /etc/nginx/sites-available/default
COPY supervisor_app.conf /etc/supervisor/conf.d/


# add (the rest of) our code

EXPOSE 80
CMD ["supervisord"]

supervisor_app.conf content

[supervisord]
nodaemon=true

[program:uwsgi]
command = /usr/local/bin/uwsgi --ini /trell-ds-framework/uwsgi.ini
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
stderr_logfile=/dev/stderr
stderr_logfile_maxbytes=0

[program:nginx]
command = /usr/sbin/nginx
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
stderr_logfile=/dev/stderr
stderr_logfile_maxbytes=0

nginx_app.conf content

server {
    listen 80 default_server;
    server_name ip_address;

    # max upload size
    client_max_body_size 75M;   # adjust to taste

    location / {
        include uwsgi_params;
        uwsgi_pass unix:///trell-ds-framework/app.sock;
    }
}

uwsgi.ini file content

[uwsgi]
callable = app
chdir = /trell-ds-framework
wsgi-file = /trell-ds-framework/wsgi.py
socket = /trell-ds-framework/app.sock
master = true
processes = 2
chmod-socket = 666
enable-threads = true

when I am trying to build the docker image in trell-ds-framework directory (using command docker build -t ds_backend . , I am getting following error on line 13/17 of Dockerfile

Step 13/17 : RUN echo "daemon off;" >> /etc/nginx/nginx.conf
 ---> Running in 1ee5628a4bc2
/bin/sh: 1: cannot create /etc/nginx/nginx.conf: Directory nonexistent
The command '/bin/sh -c echo "daemon off;" >> /etc/nginx/nginx.conf' returned a non-zero code: 2

I checked this /etc/nginx/nginx.conf file exists in my virtual machine.

I am taking help from this Tutorial - Deploy flask app with uwsgi/nginx using docker which seems to be working. But in my case its giving that error.

After following comments instruction I could build docker image successfully. Now I am getting this error below.

docker: Error response from daemon: OCI runtime create failed: container_linux.go:349: starting container process caused "exec: \"supervisord\": executable file not found in $PATH": unknown.

Can anybody help me out here. Thanks in advance.

PS: I am very new to these things. Any leads highly appreciated.

Answer 1

Since managing answers with comments is nearly impossible, I'll post the outlook of the supervisor_app.conf file here:

[program:nginx]
command = /usr/sbin/nginx -g "daemon off;"
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
stderr_logfile=/dev/stderr
stderr_logfile_maxbytes=0

I think it's what you need.

---

EDIT: I just saw the comment about supervisor not being found. It seems that you haven't installed it in Dockerfile. Here's how to add it:

apt-get install -y supervisor

You can add just the package name in one of the steps, like this:

RUN apt-get install -y ca-certificates supervisor

Note that you already have that line, just without supervisor .

---

EDIT2: As per @thsutton's answer, you also need to add nginx package, the same way you did for supervisor .

Answer 2

Does the python:3.6 image already contain nginx and supervisord ? If not, it is up to you to install them (with apt-get or a similar command, as appropriate).

The fact that the nginx config file doesn't exist, and the binary doesn't exist would suggest to me that maybe the packages are not installed.