Merge branch 'pr-414'

* pr-414:
  docker-compose: update formatting
  docker-compose: fix indentation
  Added build from dockerfile using docker-compose
  Added bests pratices and util cmds for dockerfile

docker-compose.md

@@ -16,6 +16,9 @@ version: '2'
 services:
   web:
     build: .
+    # build from Dockerfile
+    context: ./Path
+    dockerfile: Dockerfile
     ports:
      - "5000:5000"
     volumes:

dockerfile.md

@@ -30,6 +30,16 @@ RUN bundle install
 WORKDIR /myapp
 ```
 
+```
+VOLUME ["/data"]
+# Specification for mount point
+```
+
+```docker
+ADD file.xyz /file.xyz
+COPY --chown=user:group host_file.xyz /path/container_file.xyz
+```
+
 ### Onbuild
 
 ```bash
@@ -44,6 +54,37 @@ EXPOSE 5900
 CMD    ["bundle", "exec", "rails", "server"]
 ```
 
+### Entrypoint
+
+```docker
+ENTRYPOINT ["executable", "param1", "param2"]
+ENTRYPOINT command param1 param2
+```
+
+Configures a container that will run as an executable.
+
+```docker
+ENTRYPOINT exec top -b
+```
+
+This will use shell processing to substitute shell variables, and will ignore any `CMD` or `docker run` command line arguments.
+
+### Metadata
+
+```docker
+LABEL version="1.0"
+```
+
+```docker
+LABEL "com.example.vendor"="ACME Incorporated"
+LABEL com.example.label-with-value="foo"
+```docker
+
+```docker
+LABEL description="This text illustrates \
+that label-values can span multiple lines."
+```
+
 ## See also
 {: .-one-column}