msabramo / eviaas

environment variables injector as a service

eviaas

environment variables injector as a service

About

This service allows easily exposing external services to tsuru applications. It works simply by injecting some predefined environment variables in the application after binding.

Example

Let's assume you have an external logging service running at udp://my.log.service:9976 and you want to expose this value to applications without hardcoding it in them.

First you will have to create the eviaas service application and add it to tsuru:

$ git clone https://github.com/tsuru/eviaas.git

$ cd eviaas

$ tsuru app-create my-log-service-api python

$ tsuru env-set -a my-log-service-api EVI_ENVIRONS='{"MYLOG_PROTOCOL": "udp", "MYLOG_ADDRESS": "my.log.service:9976"}'

$ git push [email protected]:my-log-service-api.git master

$ cat >service_descriptor.yaml <<EOF
> id: my-log-service
> password: 1234
> endpoint:
>   production: http://my-log-service-api.192.168.50.4.nip.io
> EOF

$ crane create service_descriptor.yaml

Now your tsuru has a new service called my-log-service and you can create instances and bind apps to it:

$ tsuru service-add my-log-service my-log-instance

$ tsuru service-list
+----------------+-----------------+
| Services       | Instances       |
+----------------+-----------------+
| my-log-service | my-log-instance |
+----------------+-----------------+

$ tsuru service-bind my-log-instance -a my-app
Instance "my-log-instance" is now bound to the app "my-app".

The following environment variables are now available for use in your app:

- MYLOG_PROTOCOL
- MYLOG_ADDRESS