Multi-service image packaging operation of Dockerfile under supervisor

Writing a Dockerfile

Configure yum source

cd /tmp/docker
vim Dockerfile
FROM rhel7
EXPOSE 80 22 # Expose ports 80 and 22 to the outside world COPY dvd.repo /etc/yum.repos.d/dvd.repo
&& yum install -y httpd openssh-server openssh-clients supervisor
&& yum clean all 
&& ssh-keygen -q -t rsa -f /etc/ssh/ssh_host_rsa_key -N "" 
&& ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ed25519_key -N "" 
&& echo root:redhat | chpasswd
COPY supervisord.conf /etc/supervisord.conf
CMD ["/usr/bin/supervisord"]

vim supervisord.conf
[supervisord]
nodaemon=true

[program:sshd]
command=/usr/sbin/sshd -D

[program:httpd]
command=/usr/sbin/httpd

docker build -t rhel7:v3
Sending build context to Docker daemon 8.192 kB
Step 1/6: FROM rhel7
 ---> 0a3eb3fde7fd
Step 2/6: EXPOSE 80 22
 ---> Running in 5727c9e984a5
 ---> e25a8a0821f7
Removing intermediate container 5727c9e984a5
Step 3/6 : COPY dvd.repo /etc/yum.repos.d/dvd.repo
 ---> 2d9e8f9648a7
Removing intermediate container 62955f7a7a74
Step 4/6 : RUN rpmdb --rebuilddb && yum install -y httpd openssh-server openssh-clients supervisor && yum clean all && ssh-keygen -q -t rsa -f /etc/ssh/ssh_host_rsa_key -N "" && ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N "" && ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ed25519_key -N "" && echo root:redhat | chpasswd
Dependency Updated:
 elfutils-libelf.x86_64 0:0.166-2.el7                     

Complete!
Skipping unreadable repository '///etc/yum.repos.d/rhel7.repo'
Cleaning repos: docker dvd-rhel
Cleaning up everything
 ---> 1cb2f9e34bac
Removing intermediate container 33cb452dbc8d
Step 5/6 : COPY supervisord.conf /etc/supervisord.conf
 ---> e8de2ff5ca3c
Removing intermediate container f219cb2b6a88
Step 6/6 : CMD /usr/bin/supervisord
 ---> Running in eddfb3973ad2
 ---> dbf4cf5cb116
Removing intermediate container eddfb3973ad2
Successfully built dbf4cf5cb116

docker run -d --name vm1 -v /tmp/docker/web/:/var/www/html rhel7:v3
docker ps

docker inspect vm1
      "Networks": {
        "bridge": {
          "IPAMConfig": null,
          "Links": null,
          "Aliases": null,
          "NetworkID": "126902125dd9c54631622845c1a75d656b45023840c57944ec24f4acecf6dc3f",
          "EndpointID": "3d995f01fce91968f59b151a19ba3868292efe0a61c2ef355bcd1eb84bda7248",
          "Gateway": "172.17.0.1",
          "IPAddress": "172.17.0.2", # container's IP
          "IPPrefixLen": 16,
          "IPv6Gateway": "",
          "GlobalIPv6Address": "",
          "GlobalIPv6PrefixLen": 0,
          "MacAddress": "02:42:ac:11:00:02"
        }
      }

verify:

curl 172.17.0.2

Verify the sshd service:

Supplementary knowledge: Use Dockerfile to build a supervisor container deployment project, CMD ["supervisord","-c","/etc/supervisord.conf"] execution failed

Problem description:

When writing a Dockerfile to create a supervisor container, the last command to start supervisor does not work -> CMD ["supervisord","-c","/etc/supervisord.conf"], but executing supervisord -c /etc/supervisord.conf inside the container can run successfully.

First paste the Dockerfile file code

FROM python:latest 
WORKDIR /root/
 
RUN mkdir /etc/supervisor
RUN mkdir -p /root/projects/logs/gunicorn/
RUN mkdir -p /root/projects/logs/celery/
RUN mkdir -p /root/projects/Sy_EvaluateJkApi/logs/
RUN echo "deb http://mirrors.aliyun.com/debian/ buster main non-free contrib" > /etc/apt/sources.list
RUN echo "deb-src http://mirrors.aliyun.com/debian/ buster main non-free contrib" >> /etc/apt/sources.list
RUN echo "deb http://mirrors.aliyun.com/debian-security buster/updates main" >> /etc/apt/sources.list
RUN echo "deb-src http://mirrors.aliyun.com/debian-security buster/updates main" >> /etc/apt/sources.list
RUN echo "deb http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib" >> /etc/apt/sources.list
RUN echo "deb-src http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib" >> /etc/apt/sources.list
RUN echo "deb http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib" >> /etc/apt/sources.list
RUN echo "deb-src http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib" >> /etc/apt/sources.list
RUN apt-get update -y
RUN apt-get install -y git lrzsz vim
RUN pip install supervisor -i https://mirrors.aliyun.com/pypi/simple/
RUN pip install gunicorn -i https://mirrors.aliyun.com/pypi/simple/
RUN pip install gevent -i https://mirrors.aliyun.com/pypi/simple/
RUN /usr/local/bin/echo_supervisord_conf > /etc/supervisord.conf
RUN echo "[include]">>/etc/supervisord.conf
RUN echo "files = /etc/supervisor/*.ini">>/etc/supervisord.conf
 
ADD sy.ini /etc/supervisor/sy.ini
ADD Sy_EvaluateJkApi /root/projects/Sy_EvaluateJkApi
RUN pip3 install -r /root/projects/Sy_EvaluateJkApi/requirements.txt -i https://mirrors.aliyun.com/pypi/simple/
EXPOSE 8800
CMD ["supervisord","-c","/etc/supervisord.conf"]

There is no exception when building the container image using the docker build -t system:test . command, but running the container using docker run -itd system:test shows that the container is not running.

Solution:

Change the command CMD ["supervisord","-c","/etc/supervisord.conf"] to CMD ["supervisord","-n","-c","/etc/supervisord.conf"] and it will run successfully.

This is what is written in supervisor -n/--nodaemon -- run in the foreground (same as 'nodaemon=true' in config file). Adding -n allows supervisor to keep running in the foreground.

The above multi-service image packaging operation of Dockerfile under supervisor is all the content that the editor shares with you. I hope it can give you a reference. I also hope that you will support 123WORDPRESS.COM.

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