Dockerfile

Dockerfile

Best practices for writing Dockerfiles
Dockerfile reference

Erstellen eines Docker Image

Dockerfile >> *Build* >> Docker Image >> *Run* >>> Docker Container

BUILD BASIC IMAGE

FROM

Select Base-Image
FROM alpine:latest 

LABEL

Text Information, Description, etc..
LABEL name="Basic Image" 
LABEL version="1.0" 
LABEL description="A new basic image" 
LABEL maintainer="robopagex.com" 
LABEL contact="mymail@robopagex.com" 

ADD & COPY

ADD URL
ADD FOLDER
ADD TAR
COPY FILE
FOR BOTH: --chown=user:group

CMD & ENTRYPOINT

CMD & ENTRYPOINT | RUN ON CONTAINER START
Run only once or overwrite with docker run [command]
CMD = OVERWRITE COMMAND
ENTRYPOINT
CMD ["/bin/bash"] 
CMD ["echo","Hello"] 
CMD ["com","arg","arg"] 
Overwrite CMD IP with robopagex.com
 ENTRYPOINT ["/bin/ping"]
 CMD ["127.0.0.1"] 
 docker run -it myalpine robopagex.com
 CMD ["/bin/ping","127.0.0.1"] 
 docker run -it myalpine robopagex.com
 CMD ["/bin/ping","127.0.0.1"] 
 docker run -it myalpine bash

RUN

RUN ON BUILD | multiple run possible
 RUN echo "HELLO" 
 RUN apt-get update && \ 
     apt-get upgrade -y 

EXAMPLE

  FROM alpine:latest 
  RUN mkdir -p /app 
  COPY . /app 

JUMP INTO WORKDIR

  WORKDIR /app 
  docker run -it myalpine

  FROM alpine:latest 
  ENV name TEST 
  RUN echo "Hello, $name" 

  ENV nginx_conf /app/myconf.conf