adding more references

references/S16 Inspecting Kubernetes Resources.md

@@ -40,6 +40,7 @@ kubectl delete pod/my-apache-xxxx-yyyy
 - [Logging Architecture](https://kubernetes.io/docs/concepts/cluster-administration/logging/)
 - [Loki - Like Prometheus, but for logs](https://github.com/grafana/loki)
 - [ELK Stack](https://www.elastic.co/what-is/elk-stack)
+- [Stern multi-pod log tailing](https://github.com/stern/stern)
 
 ```shell
 kubectl logs deploy/my-apache

references/S17 Exposing Kubernetes Ports.md

@@ -0,0 +1,49 @@
+# Exposing Kubernetes Ports
+
+## Service Types
+
+- [Service Docs](https://kubernetes.io/docs/concepts/services-networking/service/)
+- [Service Examples](https://kubernetes.io/docs/tutorials/services/)
+
+```shell
+kubectl expose
+```
+
+## Creating a ClusterIP Service
+
+- [cURL utility](https://curl.se/)
+
+```shell
+kubectl get pods -w
+kubectl create deployment httpenv --image=bretfisher/httpenv
+kubectl scale deployment/httpenv --replicas=5
+kubectl expose deployment/httpenv --port 8888
+kubectl get service
+kubectl run tmp-shell --rm -it --image bretfisher/netshoot -- bash
+curl httpenv:8888
+```
+
+## Creating a NodePort and LoadBalancer Service
+
+```shell
+kubectl get all
+kubectl expose deployment/httpenv --port 8888 --name httpenv-np --type NodePort
+kubectl get services
+curl localhost:32334
+kubectl expose deployment/httpenv --port 8888 --name httpenv-lb --type LoadBalancer
+kubectl get services
+curl localhost:8888
+kubectl delete service/httpenv service/httpenv-np
+kubectl delete service/httpenv-lb deployment/httpenv
+```
+
+## Kubernetes Services DNS
+
+- [Kubernetes DNS Specification](https://github.com/kubernetes/dns/blob/master/docs/specification.md)
+- [CoreDNS for Kubernetes](https://coredns.io/plugins/kubernetes/)
+
+```shell
+curl <hostname>
+kubectl get namespaces
+curl <hostname>.<namespace>.svc.cluster.local
+```