learning docker - day 2

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1docker login

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1docker image inspect

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1# pseudo
2docker image tag <source:tag> <targetImage:tag>
3
4# actual
5docker image tag nginx yourDockerHubUsername:nginx

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1docker image push <youTaggedImageName>

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1# required to be there
2FROM debian:jessie
3
4# injecting variables for this dockerfile
5ENV NGINX_VERSION 1.11.10
6
7# executing shell commands
8RUN apt-get update && apt-get install -y --force-yes apache2
9
10# by default nothing is exported.
11# APPARENTLY WEB SERVERS USUALLY EXPORT 80 and 443 ports.
12# Port 443 is the standard port for all secured HTTP traffic,
13# meaning it’s absolutely essential for most modern web activity.
14# Encryption is necessary to protect information, as it makes its way between
15# your computer and a web server.
16# Port 80 is the host port
17
18# now you will still need to use -p or -P to open/forward these ports on the host.
19# here we just exposing them
20EXPOSE 80 443
21
22# Required the final command that will be executed each time you start or rerun an container
23# note that sometimes this command smight be missing on a Dockerfile.
24# You might wonder how this is possible when its required.
25# This is because the exists in the FROM image you will be using
26
27CMD ["nginx", "-g", "deamon:off"]

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1WORKDIR /usr/share... # this is like `cd`

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1COPY <localFileName> <dcokerBoxFileName>