In this post I will walk through all the steps of deploying a containerized web application and all the required resources to make it externally accessible.<\/p>\n
The files for this post can also be found in the public repository [Link<\/a>].<\/p>\n NAMESPACES<\/strong><\/p>\n SECRETS<\/strong><\/p>\n DEPLOYMENTS<\/strong><\/p>\n SERVICE<\/strong><\/p>\n Now you can test if the service is reachable from inside the server:<\/p>\n Note:<\/strong> Replace 10.1.1.1<\/strong> with the IP address assigned to the service.<\/p>\n If it works, run the following command to access it from a browser outside the server:<\/p>\n INGRESSES<\/strong><\/p>\n The Ingress requires an Ingress Controller to be installed on the server. It comes out of the box with Minikube.<\/p>\n If needed, see the following list of options and installation instructions at [Link<\/a>].<\/p>\n Note:<\/strong> The ingress resource will take a few seconds to acquire an external IP.<\/p>\n CHECK THE ENVIRONMENT VARIABLES<\/strong><\/p>\n OR<\/p>\n Or update the web page to display the variables:<\/p>\n SEE ALSO<\/strong><\/p>\n K3s<\/strong> on Ubuntu 20.04 [Link<\/a>].<\/p>\n Minikube<\/strong> on Ubuntu 22.04 [Link<\/a>].<\/p>\n MicroK8s<\/strong> on Ubuntu 22.04 [Link<\/a>].<\/p>\n Kubernetes<\/strong> Cheat Sheet [Link<\/a>].<\/p>\n Kubernetes<\/strong> Persistent Volumes [Link<\/a>].<\/p>\n
\nnano namespace.yaml<\/pre>\n
kind: Namespace\r\napiVersion: v1\r\nmetadata:\r\n name: demo-namespace\r\n labels:\r\n name: demo-namespace<\/pre>\n
kubectl apply -f namespace.yaml\r\nkubectl get ns<\/pre>\n
\nnano secret.yaml<\/pre>\n
apiVersion: v1\r\nkind: Secret\r\nmetadata:\r\n name: demo-secret\r\n namespace: demo-namespace\r\nstringData:\r\n SECRET_PASS: \"stringPassword\"<\/pre>\n
kubectl apply -f secret.yaml\r\nkubectl get secret -n demo-namespace\r\nkubectl describe secret demo-secret -n demo-namespace<\/pre>\n
\nnano deployment.yaml<\/pre>\n
apiVersion: apps\/v1\r\nkind: Deployment\r\nmetadata:\r\n name: demo-deployment\r\n namespace: demo-namespace\r\nspec:\r\n replicas: 1\r\n selector:\r\n matchLabels:\r\n app: demo-deployment\r\n template:\r\n metadata:\r\n labels:\r\n app: demo-deployment\r\n spec:\r\n containers:\r\n - name: demo-deployment\r\n image: nginx:alpine\r\n ports:\r\n - containerPort: 80\r\n startupProbe:\r\n httpGet:\r\n path: \/\r\n port: 80\r\n periodSeconds: 5\r\n failureThreshold: 20\r\n env:\r\n - name: USERNAME\r\n value: \"stringUsername\"\r\n - name: PASSWORD\r\n valueFrom:\r\n secretKeyRef:\r\n name: demo-secret\r\n key: SECRET_PASS<\/pre>\n
kubectl apply -f deployment.yaml\r\nkubectl get pods -n demo-namespace\r\nkubectl get pods -n demo-namespace -o wide\r\nkubectl logs -n demo-namespace demo-deployment-*********<\/strong>\r\nkubectl exec -it demo-deployment-*********-*****<\/strong> -n demo-namespace -- \/bin\/sh\r\nkubectl get replicaset -n demo-namespace<\/pre>\n
\nnano service.yaml<\/pre>\n
apiVersion: v1\r\nkind: Service\r\nmetadata:\r\n name: demo-service\r\n namespace: demo-namespace\r\nspec:\r\n type: ClusterIP\r\n ports:\r\n - port: 80\r\n selector:\r\n app: demo-deployment<\/pre>\n
kubectl apply -f service.yaml\r\nkubectl get svc -n demo-namespace\r\nkubectl describe svc demo-service -n demo-namespace<\/pre>\n
curl http:\/\/10.1.1.1<\/strong>:80\/<\/pre>\n
kubectl port-forward service\/demo-service 80:80 --address='0.0.0.0' -n demo-namespace<\/pre>\n
\nminikube addons enable ingress<\/pre>\n
nano ingress.yaml<\/pre>\n
apiVersion: networking.k8s.io\/v1\r\nkind: Ingress\r\nmetadata:\r\n name: demo-ingress\r\n namespace: demo-namespace\r\n annotations:\r\n nginx.ingress.kubernetes.io\/rewrite-target: \"\/\"\r\nspec:\r\n ingressClassName: nginx\r\n rules:\r\n - host: nginx.local\r\n http:\r\n paths:\r\n - path: \/\r\n pathType: Prefix\r\n backend:\r\n service:\r\n name: demo-service\r\n port:\r\n number: 80<\/pre>\n
kubectl apply -f ingress.yaml\r\nkubectl get ing -n demo-namespace\r\nkubectl get ing -n demo-namespace --watch\r\nkubectl describe ing demo-ingress -n demo-namespace<\/pre>\n
\nkubectl get pods -n demo-namespace<\/pre>\n
kubectl exec -it demo-deployment-**********-***** -n demo-namespace -- bash<\/pre>\n
kubectl exec --stdin --tty demo-deployment-**********-***** -n demo-namespace -- bash<\/pre>\n
root@demo-deployment-**********-*****:\/# echo $PASSWORD<\/strong>\r\nstringPassword<\/span>\r\nroot@demo-deployment-**********-*****:\/# echo $USERNAME<\/strong>\r\nstringUsername<\/span><\/pre>\nkubectl exec --stdin --tty demo-deployment-**********-***** -n demo-namespace -- bash -c \"echo \\$USERNAME : \\$PASSWORD > \/usr\/share\/nginx\/html\/index.html\"<\/pre>\n
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