Dockerfile

this blog posts shows a simple hello world Dockerfile example.

ubuntu:~/app/myapp1$ cat Dockerfile
FROM alpine
CMD ["echo", hello world!"]

ubuntu:~/app/myapp1$ sudo docker build .

Sending build context to Docker daemon  2.048kB

Step 1/2 : FROM alpine

latest: Pulling from library/alpine

6c40cc604d8e: Pull complete

Digest: sha256:b3dbf31b77fd99d9c08f780ce6f5282aba076d70a513a8be859d8d3a4d0c92b8

Status: Downloaded newer image for alpine:latest

 ---> caf27325b298

Step 2/2 : CMD ["echo hello world!"]

 ---> Running in 6b813f4405dd

Removing intermediate container 6b813f4405dd

 ---> 6aaaa0ac6697

Successfully built 6aaaa0ac6697

ubuntu:~/app/myapp1$ sudo docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

<none>              <none>              30dcbba17c50        58 seconds ago      5.53MB

alpine              latest              caf27325b298        5 weeks ago         5.53MB

nginx               1.10.0              16666ff3a57f        2 years ago         183MB

nginx               1.9.3               ea4b88a656c9        3 years ago         133MB

prabhan_world@ubuntu:~/app/myapp1$ sudo docker run --name test 30dcbba17c50

hello world!