I am trying to deploy Kong API Gateway via template to my openshift project. The problem is that Kong seems to be doing some DNS stuff that causes sporadic failure of DNS resolution. The workaround is to use the FQDN (<name>.<project_name>.svc.cluster.local). So, in my template i would like to do:
- env:
- name: KONG_DATABASE
value: postgres
- name: KONG_PG_HOST
value: "{APP_NAME}.{PROJECT_NAME}.svc.cluster.local"I am just not sure how to get the current PROJECT_NAME of if perhaps there is a default set of available parameters...
You can read the namespace(project name) from the Kubernetes downward API into an environment variable and then use that in the value perhaps.
See the OpenShift docs here for example.
Update based on Claytons comment:
Tested and the following snippet from the deployment config works.
- env:
- name: MY_POD_NAMESPACE
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: metadata.namespace
- name: EXAMPLE
value: example.$(MY_POD_NAMESPACE)Inside the running container:
sh-4.2$ echo $MY_POD_NAMESPACE
testing
sh-4.2$ echo $EXAMPLE
example.testing
In the environment screen of the UI it appears as a string value such as example.$(MY_POD_NAMESPACE)