12.10. Configuring an egress router pod destination list from a config map

Procedure

1. Create a file containing the mapping data for the egress router pod, as in the following example:

   # Egress routes for Project "Test", version 3
   
   80   tcp 203.0.113.25
   
   8080 tcp 203.0.113.26 80
   8443 tcp 203.0.113.26 443
   
   # Fallback
   203.0.113.27

   You can put blank lines and comments into this file.

2. Create a ConfigMap object from the file:

   $ oc delete configmap egress-routes --ignore-not-found

   $ oc create configmap egress-routes \
     --from-file=destination=my-egress-destination.txt

   In the previous command, the egress-routes value is the name of the ConfigMap object to create and my-egress-destination.txt is the name of the file that the data is read from.

3. Create an egress router pod definition and specify the configMapKeyRef stanza for the EGRESS_DESTINATION field in the environment stanza:

   ...
   env:
   - name: EGRESS_DESTINATION
     valueFrom:
       configMapKeyRef:
         name: egress-routes
         key: destination
   ...