Ecosyste.ms: Awesome

An open API service indexing awesome lists of open source software.

Awesome Lists | Featured Topics | Projects

https://github.com/arska/python-helloworld


https://github.com/arska/python-helloworld

Last synced: 1 day ago
JSON representation

Awesome Lists containing this project

README 

        
# really simple web application



This is a lightweight application to demo deployment to OpenShift on https://appuio.ch and accessing multiple backend services (MySQL/MariaDB, PostgreSQL and Redis) within an OpenShift cluster



One can deploy this project using

* Web-GUI using Source to image (s2i): "Add to project" -> search for "Python" -> Choose "Python" -> Next -> Version: 3.5, Name: flask-helloworld, Git Repository: https://github.com/arska/flask-helloworld.git -> Create -> Close



* OpenShift Source to Image on the CLI using the Python builder for the application only

```

oc new-app python:3.5~https://github.com/arska/python-helloworld

oc expose service python-helloworld

```

* OpenShift Docker Build (see Dockerfile, application only)

```

oc new-app --strategy=docker https://github.com/arska/python-helloworld

oc expose service python-helloworld

```

* OpenShift Template (see template.yaml) including the 3 databases:

```

oc new-app -f https://raw.githubusercontent.com/arska/python-helloworld/master/template.yaml -p NAME=python-helloworld

```



you can clean up after with:

```

oc delete all,secrets -l app=python-helloworld

```



you can also build/run this locally using docker:

```

docker build -t python-helloworld .

docker run -p 8080:8080 python-helloworld

```

the application is then accessible at http://127.0.0.1:8080/



## docker build demo

~~~~

git clone https://github.com/arska/python-helloworld

cd python-helloworld

less app.py

python app.py

less requirements.txt

virtualenv -p python3 venv

. venv/bin/activate

pip install -r requirements.txt

python app.py

open http://localhost:8080/

less Dockerfile

docker build -t python-helloworld .

docker image ls

docker run -p 8080:8080 -e MESSAGE="Hello Python Summit 2017" python-helloworld

open http://localhost:8080/

~~~~

## OpenShift

~~~~

https://console.appuio.ch/console/project/appuio-salesdemo1/overview

Add to Project

python 3.5 latest

name pysummit

https://github.com/arska/python-helloworld

OK

add webhook to github.com

copy url

click github link

add url, remember to choose JSON as type

close github

open build log

go to overview

open url http://pysummit-appuio-salesdemo1.appuioapp.ch/

show hostname in pods list

scale to 3

run in console

while [ 1 ] ; do curl http://pysummit-appuio-salesdemo1.appuioapp.ch/ ; echo; sleep 1; done

show changing hostname

quit curl in console

show pods list, show one pod detail

click on health-check warning, add default checks

show rolling deployment

applications → routes → actions → edit → show details → TLS = edge, insecure = redirect

show new url, show green lock

scale to 1

Switch to Terminal

oc status

oc new-app python~https://github.com/arska/python-helloworld --name "pysummit2" -e MESSAGE="hello python summit 2017"

oc logs -f bc/pysummit2

oc status

oc expose svc/pysummit2

open http://pysummit2-appuio-salesdemo1.appuioapp.ch

switch to https://console.appuio.ch/console/project/appuio-salesdemo1/overview to show side-by-side

oc scale dc pysummit2 --replicas=3

oc status

oc delete all -l app=pysummit2

oc status

oc export all -o json

oc export bc,is,svc,dc,route

oc export bc,is,svc,dc,route --as-template=mytemplate > template.yaml

sed -i '' 's/pysummit/${NAME}/' template.yaml

cat >> template.yaml



parameters:

- description: The name assigned to all of the frontend objects defined in this template.

  displayName: Name

  name: NAME

  required: true

  value: pysummit-template



ctrl-D

oc process -f template.yaml NAME=lol | oc create -f -

show health checks are there

oc delete all -l app=lol

oc create -f template.yaml

webgui → add to project → search: mytemplate

that was too easy, only one service

webgui → add to project → django-psql-example

group django and postgresql

show postgresql env and log

show django build log

takes about 3 minutes, so lets demo the auto-update

go to https://github.com/arska/python-helloworld/blob/master/README.md and commit dummy edit

show build being triggered

when django build is done and pod is started from pod console

python manage.py createsuperuser

log in to django admin

show log

~~~~

## clean up

~~~~

oc delete all -l app=pysummit

oc delete all -l app=django-psql-example

oc delete secret django-psql-example

~~~~