+ docker pull alpine:3.9 3.9: Pulling from library/alpine e7c96db7181b: Pulling fs layer e7c96db7181b: Verifying Checksum e7c96db7181b: Download complete e7c96db7181b: Pull complete Digest: sha256:769fddc7cc2f0a1c35abb2f91432e8beecf83916c421420e6a6da9f8975464b6 Status: Downloaded newer image for alpine:3.9