Dockerizing your apps
Building Docker Images
app
image
containers
registry
Approaches
Imperative
Declarative
VM Like
Dockerfile
(manual)
(automated)
Imperative
registry
image
image
intermediate container
code
cp
build
commit
pull
run
push
-
pull image
-
run container
-
copy source code
-
build/compile
-
commit
-
push
Steps
dockerfile
FROM
RUN
COPY
EXPOSE
CMD
dockerfile
FROM
RUN
COPY
EXPOSE
CMD
docker build
image
http://hub.docker.com
http://store.docker.com
sign up
Building Image for Worker App
vote ui
redis
worker
db
results
-
Java App
-
Maven
https://github.com/schoolofdevops/voting-app-worker
registry
centos
install jdk
install mvn
mvn compile
mvn
mvn compile
Worker app
https://gist.github.com/initcron/f35f7854a8176374a48963ed8aae0b8e
Application Code
Image creation instructions (Manual)
https://github.com/schoolofdevops/voting-app-worker
registry
mvn
mvn
intermediate container
code
cp
build
commit
pull
run
artifact
host
Build Stage
registry
java
java
intermediate container
artifact
cp
commit
pull
run
push
host
package Stage
user/app:v2
Dockerfile
Dockerfile
FROM microsoft/dotnet-samples:aspnetapp
WORKDIR /app
RUN mkdir C:\site
ENTRYPOINT ["cmd"]build
docker image build -t <dockrhub user id>/app:v2 .
docker image ls
dot (current directory)
test image
docker container run -idt --name workertest2 <dockrhub user id>/app:v2
docker container ls
docker logs workertest2
docker image tag <dockrhub user id>/app:v2 <dockrhub user id>/app:latest
docker image ls
docker image push <dockrhub user id>/app:latest
docker image push <dockrhub user id>/app
Tag
publish
push
docker image push <dockrhub user id>/app:latest
docker image push <dockrhub user id>/app