diff --git a/k8s_day10.txt b/k8s_day10.txt new file mode 100644 index 0000000..d97d199 --- /dev/null +++ b/k8s_day10.txt @@ -0,0 +1,77 @@ +Create two namespaces and name them ns1 and ns2 +k create ns ns1 +k create ns ns2 + +Create a deployment with a single replica in each of these namespaces with the image as nginx and name as deploy-ns1 and deploy-ns2, respectively +k create deployment deploy-ns1 --image=nginx --replicas=1 -n ns1 +k create deployment deploy-ns2 --image=nginx --replicas=1 -n ns2 + +Get the IP address of each of the pods (Remember the kubectl command for that?) +k get po -n ns1 -o wide +k get po -n ns2 -o wide + +Exec into the pod of deploy-ns1 and try to curl the IP address of the pod running on deploy-ns2 +k exec -it -n ns1 deploy-ns1-56c4d4b7-xzvl2 -- sh +curl 10.244.2.4 + +Your pod-to-pod connection should work, and you should be able to get a successful response back. + + + +Welcome to nginx! + + + +

Welcome to nginx!

+

If you see this page, the nginx web server is successfully installed and +working. Further configuration is required.

+ +

For online documentation and support please refer to +nginx.org.
+Commercial support is available at +nginx.com.

+ +

Thank you for using nginx.

+ + + +Now scale both of your deployments from 1 to 3 replicas. +k scale --replicas=3 -n ns1 deploy/deploy-ns1 +k scale --replicas=3 -n ns2 deploy/deploy-ns2 + + +deploy-ns1-56c4d4b7-xzvl2 10.244.2.3 kind-worker2 +deploy-ns2-846f6b4c9b-r85f7 10.244.2.4 kind-worker2 + +Create two services to expose both of your deployments and name them svc-ns1 and svc-ns2 +k expose deployment deploy-ns1 -n ns1 --port=80 --target-port=80 +k expose deployment deploy-ns2 -n ns2 --port=80 --target-port=80 + +exec into each pod and try to curl the IP address of the service running on the other namespace. +k exec -it deploy-ns1-56c4d4b7-4tptj -n ns1 -- sh +curl 10.244.1.6 +k exec -it deploy-ns2-846f6b4c9b-7dqwf -n ns2 -- sh +curl 10.244.1.4 + +This curl should work. +Yes + +Now try curling the service name instead of IP. You will notice that you are getting an error and cannot resolve the host. +in deploy-ns2-846f6b4c9b-7dqwf: +curl deploy-ns1-56c4d4b7-4tptj not work +curl deploy-ns2-846f6b4c9b-7dqwf works + +Now use the FQDN of the service and try to curl again, this should work. +curl deploy-ns1.ns1.svc.cluster.local +works +n the end, delete both the namespaces, which should delete the services and deployments underneath them. +k delete svc deploy-ns1 -n ns1 +k delete svc deploy-ns2 -n ns2 + +k delete deployment deploy-ns1 -n ns1 +k delete deployment deploy-ns2 -n ns2 +k delete ns ns1 ns2 \ No newline at end of file