fluent-logger-node | A structured logger for Fluentd

Focusing on below parts of the question:

I'd like send logs from my nodejs pods to a Fluentd DeamonSet.

EDIT : I harcoded the fluentd service IP directly in my express app and its working.. how to get it work without harcoding ip?

It looks like the communication between pods and the fluentd service is correct (hardcoding the IP works). The issue here is the way they can communicate with each other.

You can communicate with service fluentd by its name. For example (from the inside of a pod):

• curl fluentd:24224

You can communicate with services by its name (like fluentd) only in the same namespace. If a service is in another namespace you would need to use it's full DNS name. It's template and example is following:

• template: service-name.namespace.svc.cluster.local
• example: fluentd.kube-system.svc.cluster.local

You can also use service of type ExternalName to map the full DNS name of your service to a shorter version like below:

Assuming that (example):

• You have created a nginx-namespace namespace:
  • $ kubectl create namespace nginx-namespace
• You have an nginx Deployment inside the nginx-namespace and a service associated with it:
  • $ kubectl create deployment nginx --image=nginx --namespace=nginx-namespace
  • $ kubectl expose deployment nginx --port=80 --type=ClusterIP --namespace=nginx-namespace
• You want to communicate with nginx Deployment from another namespace (i.e. default)

You have an option to communicate with above pod:

• By the IP address of a Pod
  • 10.98.132.201
• By a (full) DNS service name
  • nginx.nginx-namespace.svc.cluster.local
• By an ExternalName type of service that points to a a (full) DNS service name
  • nginx-service

The example of ExternalName type of service: