Script to produces Kubernetes manifests to deploy bare nginx container - nginx

Question

I would like to have a script that produces Kubernetes manifests to deploy a bare nginx container with service port 80 and ingress for host as example.nginx.com. I will deploy it into EKS cluster. Can someone give me clue?

Answer 1

Recently I started configuring NLB with Nginx controller on EKS. So documenting the complete flow with the script you needed.
I tried other approached like cloud provider based Nginx deployment but it didn't work as expected ( instead of ELB it was creating Classic LB).
Ref- https://github.com/kubernetes/ingress-nginx/issues/6292
In short below approach is the best so far.
Install Nginx controller- This will create a deployment and a NodePort service for HTTP say port- 31848, HTTPS- 30099
#kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.0.1/deploy/static/provider/baremetal/deploy.yaml
Create Production deployment, service and ingress resource.
apiVersion: apps/v1
kind: Deployment
metadata:
name: production
labels:
app: production
namespace: app
spec:
replicas: 1
selector:
matchLabels:
app: production
template:
metadata:
labels:
app: production
spec:
containers:
- name: production
image: mirrorgooglecontainers/echoserver:1.10
ports:
- containerPort: 8080
env:
- name: NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
---
apiVersion: v1
kind: Service
metadata:
name: production
labels:
app: production
namespace: app
spec:
ports:
- port: 80
targetPort: 8080
protocol: TCP
name: http
selector:
app: production
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: production
annotations:
kubernetes.io/ingress.class: nginx
namespace: app
spec:
rules:
- http:
paths:
- path: /
pathType: Prefix
backend:
serviceName: production
servicePort: 80
Create Canary Deployment.
apiVersion: apps/v1
kind: Deployment
metadata:
name: canary
labels:
app: canary
namespace: app
spec:
replicas: 1
selector:
matchLabels:
app: canary
template:
metadata:
labels:
app: canary
spec:
containers:
- name: canary
image: mirrorgooglecontainers/echoserver:1.10
ports:
- containerPort: 8080
env:
- name: NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
---
apiVersion: v1
kind: Service
metadata:
name: canary
labels:
app: canary
namespace: app
spec:
ports:
- port: 80
targetPort: 8080
protocol: TCP
name: http
selector:
app: canary
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: canary
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/canary: "true"
nginx.ingress.kubernetes.io/canary-weight: "30"
namespace: app
spec:
rules:
- http:
paths:
- path: /
pathType: Prefix
backend:
serviceName: canary
servicePort: 80
Create a NLB type Load Balancer on EKS. If you are choosing "internet-facing".
Create a Target Group with "Target Type" as instance and Port/Health Check Port- 31848 (HTTP).
Attach Target Group to Autoscaling group.
Create a listener on NLB (TLS- Secure TCP) and forward it to the Target Group.
Although we would be launching worker nodes on Private subnets but we need to open port "31848" for all the IP. This is how EC2 would be able to communicate with NLB.
Hope I am able to provide you clear idea on this. Please do let me know in case you face any issue.

Answer 2

You must have deployed nginx-ingress to your cluster. Then run the following script at your command prompt to deploy a bare nginx container with service port 80 and ingress for host as example.nginx.com:
cat << EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
spec:
replicas: 1
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:alpine
imagePullPolicy: IfNotPresent
ports:
- name: http
containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: nginx
spec:
selector:
app: nginx
ports:
- name: http
protocol: TCP
port: 80
targetPort: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: nginx
annotations:
kubernetes.io/ingress.class: "nginx"
spec:
rules:
- host: example.nginx.com
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: nginx
port:
number: 80
EOF