docker entrypoint example

Example 1: CMD or Entrypoint in Docker

FROM ubuntu:trusty
CMD ["/bin/ping","localhost"]

Example 2: CMD or Entrypoint in Docker

$ docker run -d demo
15bfcddb11b5cde0e230246f45ba6eeb1e6f56edb38a91626ab9c478408cb615

$ docker ps -l
CONTAINER ID IMAGE COMMAND CREATED
15bfcddb4312 demo:latest "/bin/sh -c 'ping localhost'" 2 seconds ago

Example 3: dockerfile entrypoint python3

Dockerfile    Command
ENTRYPOINT /bin/ping -c 3
CMD localhost    /bin/sh -c '/bin/ping -c 3' /bin/sh -c localhost
ENTRYPOINT ["/bin/ping","-c","3"]
CMD localhost    /bin/ping -c 3 /bin/sh -c localhost
ENTRYPOINT /bin/ping -c 3
CMD ["localhost"]"    /bin/sh -c '/bin/ping -c 3' localhost
ENTRYPOINT ["/bin/ping","-c","3"]
CMD ["localhost"]    /bin/ping -c 3 localhost

Example 4: dockerfile run app cmd

RUN apt-get install python3
CMD echo "Hello world"
ENTRYPOINT echo "Hello world"