Local development with Kubernetes

bar.yaml

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: bar
spec:
  template:
    metadata:
      labels:
        app: bar
    spec:
      containers:
        - name: bar
          image: paddycarey/go-echo
          ports:
            - name: http
              containerPort: 8000
---

kind: Service
apiVersion: v1
metadata:
  name: bar
spec:
  selector:
    app: bar
  ports:
    - protocol: "TCP"
      port: 8081
      targetPort: 8000
  type: LoadBalancer

create_ide_service.sh

#!/usr/bin/env bash
#
# Creates a service with an endpoint that is your computer's IP so services can route out of the cluster to your
# IDE
#
set -e

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
TEMPLATE="${DIR}/ide-template.yaml"

service=$1
port=$2

if [ -z $service ] ; then
	echo "Specify the service as the first param"
	exit 1
fi

if ! [[ $port =~ ^-?[0-9]+$  ]] ; then
   echo "Second argument must be the port number but was $port"
   exit 1
fi

# now get the IP address
if [ "$(uname)" == "Darwin" ] ; then
	interface=$(route -n get default | grep interface | awk '{print $2}')
	#echo "You're on a mac and your default interface seems to be $interface"
	ip=$(ipconfig getifaddr $interface)

else
	ip=$(ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1  -d'/')
fi


echo "Creating service ${service} on ${ip}:${port}"
tmpFile="$DIR/$service.tmp.ide.yml"
sed "s/{{port}}/${port}/g" $TEMPLATE > $tmpFile

if [ "$(uname)" == "Darwin" ] ; then
	# Sed is different on OS-X And requires an argument for the -i flag.
	sed -i '' "s/{{ip}}/${ip}/g" $tmpFile
	sed -i '' "s/{{service}}/${service}/" $tmpFile
else
	sed -i "s/{{ip}}/${ip}/g" $tmpFile
	sed -i "s/{{service}}/${service}/" $tmpFile
fi

echo "Created:"
cat $tmpFile

if kubectl get services -o=name | grep -q $service ; then
	echo "Deleting previous service"
	kubectl delete service $service
	sleep 1 # Give it some time to take care of that...
fi

echo "Posting the new service"
kubectl create -f $tmpFile

foo.yaml

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: foo
spec:
  template:
    metadata:
      labels:
        app: foo
    spec:
      containers:
        - name: foo
          image: paddycarey/go-echo
          ports:
            - name: http
              containerPort: 8000
---

kind: Service
apiVersion: v1
metadata:
  name: foo
spec:
  selector:
    app: foo
  ports:
    - protocol: "TCP"
      port: 8080
      targetPort: 8000
  type: LoadBalancer

ide-service.yaml

kind: Service
apiVersion: v1
metadata:
  name: foo
spec:
  ports:
  - protocol: TCP
    port: 8080
    targetPort: 8080

---

kind: Endpoints
apiVersion: v1
metadata:
  name: foo
subsets:
  - addresses:
      - ip: 192.168.0.2
    ports:
      - port: 8080

ide-template.yaml

kind: Service
apiVersion: v1
metadata:
  name: {{service}}
spec:
  ports:
  - protocol: TCP
    port: {{port}}
    targetPort: {{port}}

---

kind: Endpoints
apiVersion: v1
metadata:
  name: {{service}}
subsets:
  - addresses:
      - ip: {{ip}}
    ports:
      - port: {{port}}