Fix installation instructions

[pchtsp]

I used the installation documentation on the following places:

• https://baobabsoluciones.github.io/cornflow/main/install.html
• https://github.com/baobabsoluciones/cornflow/blob/master/QUICK_START_GUIDE.RST

Following these instructions I failed to install any of the parts (cornflow or ariflow) correctly.

I had to go look for the unit tests of cornflow client to understand the current steps and adapt them to a normal (i.e., outside of github) environment.

here are a few of the issues I found in the two guides above:

• apache airflow version is wrong (2.7.1 vs 2.1)
• there's no instruction to do cd cornflow-server before installing virtual environments and deploying.
• the flask db upgrade instruction lacks an argument.
• cornflow-dags dags and requirements need to be copied to the airflow_config directory
• Unconsistent references to afvenv and cfvenv (venv) in all documentation/ guied.
• A command to install apache airflow providers google was missing and lead to an error. Solved with pip install apache-airflow-providers-google
• References to python instead of python3 are not portable to Ubuntu (replacing with python3 worked)
• A reference to a cornflow port on launch (5050 vs 5000) was inconsistent.

I'm sure I'm still lacking a few things. I leave below the installation instructions (commands) that worked for me, merging from memory, unit tests and current docs.

---

Cornflow server installation and running

cd cornflow-server
python -m venv cfvenv
source cfvenv/bin/activate
python3 -m pip install -U -r requirements-dev.txt
python3 -m pip install -U -e ../libs/client

export FLASK_APP=cornflow.app
export FLASK_ENV=development
export DATABASE_URL=sqlite:///cornflow.db
export SECRET_KEY=THISNEEDSTOBECHANGED
export AIRFLOW_URL=http://localhost:8080
export AIRFLOW_USER=admin
export AIRFLOW_PWD=admin

flask db upgrade -d cornflow/migrations/
flask access_init
flask register_deployed_dags -r http://127.0.0.1:8080 -u admin -p admin
flask create_admin_user -u admin -e admin@cornflow.org -p Adminpassword1!
flask create_service_user -u airflow -e airflow@cornflow.org -p Airflow_test_password1
flask create_base_user -u user -e user@cornflow.org -p UserPassword1!
flask register_dag_permissions -o 1
flask run -p 5050 &

---

Airflow server installation

cp -r cornflow-dags/DAG/* cornflow-server/airflow_config/dags/
cp cornflow-dags/requirements.txt cornflow-server/airflow_config/
cd cornflow-server
python3 -m venv afvenv
source afvenv/bin/activate
AIRFLOW_VERSION=2.7.1
PYTHON_VERSION="$(python3 --version | cut -d " " -f 2 | cut -d "." -f 1-2)"
CLIENT_BRANCH="${{ github.head_ref || github.ref_name }}"
CONSTRAINT_URL="https://raw.githubusercontent.com/apache/airflow/constraints-${AIRFLOW_VERSION}/constraints-${PYTHON_VERSION}.txt"
python3 -m pip install "apache-airflow==${AIRFLOW_VERSION}" --constraint "${CONSTRAINT_URL}"
python3 -m pip install -U orloge pulp
python3 -m pip install -U -e ../libs/client
python3 -m pip install -U -r airflow_config/requirements.txt
pip install apache-airflow-providers-google
airflow db init
airflow users create -u admin -f admin -l admin -r Admin -p admin -e admin@example.org

Airflow server running

export AIRFLOW_HOME="$PWD/airflow_config"
export AIRFLOW__CORE__LOAD_EXAMPLES=0
export AIRFLOW__CORE__DAGS_ARE_PAUSED_AT_CREATION=0
export AIRFLOW__API__AUTH_BACKEND=airflow.api.auth.backend.basic_auth
export AIRFLOW__WEBSERVER__SECRET_KEY=e9adafa751fd35adfc1fdd3285019be15eea0758f76e38e1e37a1154fb36
export AIRFLOW_CONN_CF_URI=http://airflow:Airflow_test_password1@localhost:5050
airflow webserver -p 8080 &
airflow scheduler &

[ggsdc]

Thank you @pchtsp we will work to fix the documentation issues asap.

[ggsdc]

Fixed by #506