Mistakes in the documentaion

[KurtWasko]

I was trying to follow this page: Linux with Docker and found some mistakes that blocked me.

1. In this step:

export ELASTICSEARCH_URL="http://localhost:9200"
bash create_es_indexes.sh

the script uses "http://$ELASTICSEARCH_URL/...", which doubles the http.

2. In this step:

export GRAFANA_URL="http://localhost:3000"
bash grafana/add_grafana_data_sources.sh

the script uses "http://$GRAFANA_URL/api/datasources", which again doubles http.

I worked around these by changing the export command to remove the http, but might be better to change the scripts, especially since it then calls:

python3 grafana/gen_grafana_model.py

which is expecting $GRAFANA_URL to be the full URL: "http://localhost:3000". Also the backup URL in the command used in the python script:

grafana_url = os.getenv("GRAFANA_URL", "http://$GRAFANA_URL/")

will never work, so there's no point in using it.

[KurtWasko]

After revisiting this, the solution I think is best is the following:

1. Modify grafana/gen_grafana_model.py

         grafana_url = os.getenv("GRAFANA_URL", "localhost:3000").strip()
         if not grafana_url.startswith("http://"):
             grafana_url = f"http://{grafana_url}"

2. Modify grafana/add_grafana_data_sources.sh

         -d @- <<EOF
         ...existing code with no single quotes...
         EOF

3. Change
   export ELASTICSEARCH_URL="http://localhost:9200"
   to
   export ELASTICSEARCH_URL="localhost:9200"
4. Change
   export GRAFANA_URL="http://localhost:3000"
   to
   export GRAFANA_URL="localhost:3000"