golang-go

# https://gowebexamples.com/hello-world/

docker run --name gowebapp -p 80:80 -id quickbooks2018/goapp:v1


Go Application
---------------
web.go
-------
package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello from cloudgeeks.ca")
    })

    http.ListenAndServe(":80", nil)
}



Dockerfile
----------
FROM golang:alpine

# Set the Current Working Directory inside the container
WORKDIR /usr/src/goapp

# Copy everything from the current directory to the PWD (Present Working Directory) inside the container
COPY web.go /usr/src/goapp/web.go


# This container exposes port 8080 to the outside world
EXPOSE 80

# Run the executable
CMD ["go","run","web.go"]

# Kubernetes
# https://www.youtube.com/watch?v=XqMdrtwRwqw&ab_channel=ContainersfromtheCouch  ---> 40min
# https://github.com/aws-samples/amazon-eks-sample-http-service


goapp
------

goapp.yaml with AWS ALB Ingress


---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: goapp
  labels:
    app: goapp
spec:
  replicas: 1
  selector:
    matchLabels:
      app: goapp
      tier: frontend
  template:
    metadata:
      labels:
        app: goapp
        tier: frontend
    spec:
      containers:
      - image: quickbooks2018/goapp:v1
        imagePullPolicy: Always
        name: goapp
        ports:
        - containerPort: 80
          name: http
        resources:
          limits:
            cpu: 500m
            memory: 1024Mi
          requests:
            cpu: 500m
            memory: 1024Mi
---
apiVersion: v1
kind: Service
metadata:
  name: goapp
  labels:
    app: goapp
spec:
  ports:
    - name: http
      port: 80
      targetPort: http
  selector:
    app: goapp
    tier: frontend
  type: NodePort
 
---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: devops.cloudgeeks.ca
  labels:
    name: goapp
  namespace: default
  annotations:
    kubernetes.io/ingress.class: alb
    alb.ingress.kubernetes.io/target-type: ip
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/healthcheck-protocol: HTTP
    alb.ingress.kubernetes.io/healthcheck-port: traffic-port
    alb.ingress.kubernetes.io/healthcheck-path: /
    alb.ingress.kubernetes.io/healthcheck-interval-seconds: '15'
    alb.ingress.kubernetes.io/healthcheck-timeout-seconds: '5'
    alb.ingress.kubernetes.io/success-codes: '200'
    alb.ingress.kubernetes.io/healthy-threshold-count: '2'
    alb.ingress.kubernetes.io/unhealthy-threshold-count: '2'
spec:
  rules:
    - host: devops.cloudgeeks.ca
      http:
        paths:
          - path: /
            backend:
              serviceName: goapp
              servicePort: 80