An Introduction to Kubernetes in the Cloud

An Introduction to Kubernetes in the Cloud

GKE

Google Kubernetes Engine.
Google Cloud Account - get a free one here.

The Free Trial

3 months
300$ free trial - dunno what that means
"get started for free" button
go through all the setup, including inputting address and form of payment (its free!)
an initial "first project" will be made, but ignore that

Setting Up K8s in GKE

open the "navigation" bar
find the "Kubernetes Engine" item
A new mini-dropdown will appear, but click on the "kubernetes engine" item, none of the items in the mini-dropdown
click "enable" (this may spin for a bit)
NO
click the "clusters" option?!
try the auto-pilot option, to have gke manage the node for me

Create a Cluster

Nice: "Ccreate an Autopilot Cluster"

I set the name to example-voting-app
I set the region to us-east1
click "create" button!!
- this may take several minutes
- the cluster will appear as a row in a table
- click on the cluster to see the deployment details as they happen in a cluster-detail view

Connect to the Cluster

navigate back to the k8s cluster list view
find the vertical ellipses at the right-most end of the example-voting-app row
click that, open a d
click the connect option
a new modal appears with a few connection options
Copy the suggested script in the modal
select the RUN IN CLOUD SHELL option
Notice!
- Cloud Shell comes with Cloud SDK gcloud, Cloud Code, an online Code Editor and other utilities pre-installed, fully authenticated and up-to-date. (Cloud Shell Docs)

Setup Pods & Services on the Cluster

run the copied scrip in the in-browser shell
try kubectl get nodes && see some nodes
try kubectl get services and see the kubernetes ClusterIP service - this should feel similar to the previous posts about setting up k8s locally in docker + minikube
Clone my git repo with all of the config files in it into the gke env shell
- if you are reading this, find me & ask me... or... see previous posts & do some config work :)
Adjust the configs of the voting-app service && the result-app service
- set the type to LoadBalancer
- remove the nodePort line
- remove the externalIps line

Create the services:

# voting app deployment
mretfaster@cloudshell:~/configs/k8s$ kubectl create -f deployments/voting-app.yaml
W0709 20:03:45.787401     998 gcp.go:120] WARNING: the gcp auth plugin is deprecated in v1.22+, unavailable in v1.25+; use gcloud instead.
To learn more, consult https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke
Warning: Autopilot set default resource requests for Deployment default/voting-app-deploy, as resource requests were not specified. See http://g.co/gke/autopilot-defaults.
deployment.apps/voting-app-deploy created

# voting app service
mretfaster@cloudshell:~/configs/k8s$ kubectl create -f services/voting-app.yaml
W0709 20:04:29.643591    1009 gcp.go:120] WARNING: the gcp auth plugin is deprecated in v1.22+, unavailable in v1.25+; use gcloud instead.
To learn more, consult https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke
service/voting-service created



# Redis deployment
mretfaster@cloudshell:~/configs/k8s$ kubectl create -f deployments/redis.yaml
W0709 20:05:07.662490    1018 gcp.go:120] WARNING: the gcp auth plugin is deprecated in v1.22+, unavailable in v1.25+; use gcloud instead.
To learn more, consult https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke
Warning: Autopilot set default resource requests for Deployment default/redis-deploy, as resource requests were not specified. See http://g.co/gke/autopilot-defaults.
deployment.apps/redis-deploy created

# redis service
mretfaster@cloudshell:~/configs/k8s$ kubectl create -f services/redis.yaml
W0709 20:05:16.189782    1029 gcp.go:120] WARNING: the gcp auth plugin is deprecated in v1.22+, unavailable in v1.25+; use gcloud instead.
To learn more, consult https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke
service/redis created



# pg deployment
mretfaster@cloudshell:~/configs/k8s$ kubectl create -f deployments/pg.yaml
W0709 20:05:56.479457    1038 gcp.go:120] WARNING: the gcp auth plugin is deprecated in v1.22+, unavailable in v1.25+; use gcloud instead.
To learn more, consult https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke
Warning: Autopilot set default resource requests for Deployment default/pg-deploy, as resource requests were not specified. See http://g.co/gke/autopilot-defaults.
deployment.apps/pg-deploy created

# pg service
mretfaster@cloudshell:~/configs/k8s$ kubectl create -f services/pg.yaml
W0709 20:06:02.529071    1047 gcp.go:120] WARNING: the gcp auth plugin is deprecated in v1.22+, unavailable in v1.25+; use gcloud instead.
To learn more, consult https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke
service/db created



# worker deployment
mretfaster@cloudshell:~/configs/k8s$ kubectl create -f deployments/worker.yaml
W0709 20:06:46.012595    1057 gcp.go:120] WARNING: the gcp auth plugin is deprecated in v1.22+, unavailable in v1.25+; use gcloud instead.
To learn more, consult https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke
Warning: Autopilot set default resource requests for Deployment default/worker-deploy, as resource requests were not specified. See http://g.co/gke/autopilot-defaults.
deployment.apps/worker-deploy created


# results deployment + service
mretfaster@cloudshell:~/configs/k8s$ kubectl create -f deployments/result-app.yaml
W0709 20:07:16.549460    1066 gcp.go:120] WARNING: the gcp auth plugin is deprecated in v1.22+, unavailable in v1.25+; use gcloud instead.
To learn more, consult https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke
Warning: Autopilot set default resource requests for Deployment default/result-app-deploy, as resource requests were not specified. See http://g.co/gke/autopilot-defaults.
deployment.apps/result-app-deploy created
mretfaster@cloudshell:~/configs/k8s$ kubectl create -f services/result-app.yaml
W0709 20:07:21.348944    1075 gcp.go:120] WARNING: the gcp auth plugin is deprecated in v1.22+, unavailable in v1.25+; use gcloud instead.
To learn more, consult https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke
service/result-service created


# see it all!
NAME                                READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/pg-deploy           0/1     1            0           2m38s
deployment.apps/redis-deploy        1/1     1            1           3m27s
deployment.apps/result-app-deploy   0/2     2            0           78s
deployment.apps/voting-app-deploy   1/1     1            1           4m47s
deployment.apps/worker-deploy       0/1     1            0           106s

NAME                     TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)        AGE
service/db               ClusterIP      10.83.130.157   <none>          5432/TCP       2m33s
service/kubernetes       ClusterIP      10.83.128.1     <none>          443/TCP        32m
service/redis            ClusterIP      10.83.131.6     <none>          6379/TCP       3m19s
service/result-service   LoadBalancer   10.83.129.126   <not-show-u>    80:31255/TCP   74s
service/voting-service   LoadBalancer   10.83.129.138   <not-show-u>    80:31652/TCP   4m4s

Notice:

the worker app takes a bit to deploy
the LoadBalancer services have external ips! these are accessible from the www!

Inspect Some Cluster Contents with GKE GUI

go back to the browser view, and if the cluster is not selected from the cluster list, select it :)
select a sidebar item, the Services & Ingress option

Notice:

this is a nice gui option to view & click through the config - similar to the cli
poke around ,see the pods, deployments, and services!

Check the app

Find the service EXTERNAL-IP addresses for the result-service and the voting-service: note, they are not shown above but they are present in the GKE.
Go to those in the browser!! Crazy. K8s deployed in the cloud.

AWS

Kubernetes can be deployed on AWS. A bunch of pre-reqs, though:

Pre Requisites

See this link for more deets...

AWS Account
- I already had one setup! #win
EKS Setup
- I searched for eks & the service appeared
- there's an option to "Add Cluster"
Kubectl util on my machine
- got that
Some AWS "General Knowledge"
- config a cluster role for eks
- configure an iam role for a node group
- config a vpc
- config a ec2 key pair used to ssh in to the worker node(s)

Another post here attempts to get K8s setup in aws. The doc does not complete the task. AWS is significantly more complex to setup than GKE.

Azure

Azure also offers K8s tooling.

Tags:

Kubernetes