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KubeCon Talk 2016- Basics of Kubernetes Service Discovery
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Brandon Philips
November 08, 2016
Programming
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KubeCon Talk 2016- Basics of Kubernetes Service Discovery
Demo uses
https://coreos.com/kubernetes/docs/latest/network-troubleshooting.html
Brandon Philips
November 08, 2016
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Transcript
Brandon Philips @brandonphilips |
[email protected]
| coreos.com Kubernetes Service Discovery
Fundamentals and Extensions
90+ Projects on GitHub, 1,000+ Contributors OPEN SOURCE Secure solutions,
support plans, training + more ENTERPRISE CoreOS is Running the World’s Containers Linux
Examples minikube
- Use the quickstart tutorial - Or try out rkt
quickstart - Ensure you get kubectl work: kubectl get nodes NAME STATUS AGE minikube Ready 6m minikube
Overview Label Service Discovery
Fundamental API Server - API Server is bedrock of discovery
- Available at well-known URL - Protected by TLS and accounts
Fundamental Labels
Fundamental Labels
kubectl run nginx --image=nginx -l app=nginx kubectl get replicaset -l
app=nginx kubectl get pods -l app=nginx -w Fundamental Labels
Fundamental Labels
kubectl expose deployment nginx --port 80 --type=NodePort minikube service nginx
Fundamental Labels
Overview Above the API
- Configured statically in kubelet (--cluster-dns) - Injected into /etc/resolv.conf
of containers - Meta alert: DNS Service IP backed by Kubernetes - kubectl describe service -n kube-system kube-dns DNS Add-on
Name: kube-dns Namespace: kube-system Labels: k8s-app=kube-dns Selector: k8s-app=kube-dns Type: ClusterIP
IP: 10.0.0.10 Port: dns 53/UDP Endpoints: 10.1.0.3:53 kube-dns the service
DNS Add-on Basics API Server kube-dns Service 10.0.0.10 dig +vc
-p @10.0.0.10 kube-dns.kube-system.svc.cluster.local ;; QUESTION SECTION: ;kube-dns.kube-system.svc.cluster.local. IN A ;; ANSWER SECTION: kube-dns.kube-system.svc.cluster.local. 30 IN A 10.0.0.10
Copy/paste one-liner to forward DNS to localhost $ dig +vc
-p 5300 @127.0.0.1 cluster.local kube-dns proxy to localhost
$ dig A etcd-0000.default.cluster.local etcde-0001.default.svc.cluster.local. 30 IN A 10.0.0.40 $
dig SRV _client._tcp.etcd-0000.default.cluster.local IN SRV 10 100 2379 etcde-0001.default.svc.cluster.local. DNS Add-on - Records
$ dig A etcd-0000 IN A 10.0.0.40 $ dig A
etcd-0000.default IN A 10.0.0.40 DNS Add-on - Search
Full docs are comprehensive I helped write them :) http://kubernetes.io/docs/admin/dns/
kube-dns full docs
tectonic.com/summit - @TectonicSummit December 12 & 13 2016 - New
York City
Thank you! Brandon Philips @brandonphilips |
[email protected]
| tectonic.com We’re
hiring in all departments! Email:
[email protected]
Positions: coreos.com/ careers