Replicated: Install Services

#!/bin/bash

set -euo pipefail

ARGS=( "${@:1}" )
HELLOWORLD_CTX="${ARGS[0]}"
OTHER_CTX="${ARGS[1]}"

function deleteNamespace()
{
  for CTX in "${ARGS[@]}"; do
    # Delete the namespace if it already exists.
    kubectl delete ns sample --context=${CTX} --ignore-not-found
  done
}

function createNamespace()
{
  for CTX in "${ARGS[@]}"; do
    # Create the namespaces
    kubectl create --context=${CTX} namespace sample
    kubectl label --context=${CTX} namespace sample \
      istio-injection=enabled
  done
}

function deploySleep()
{
  for CTX in "${ARGS[@]}"; do
    # Deploy Sleep
    kubectl apply --context=${CTX} \
      -f samples/sleep/sleep.yaml -n sample
  done
}

function deployHelloWorldToFirstCluster()
{
  # Deploy HelloWorld Service
  kubectl apply --context=${HELLOWORLD_CTX} \
    -f samples/helloworld/helloworld.yaml \
    -l app=helloworld -n sample

  # Deploy HelloWorld version.
  kubectl apply --context=${HELLOWORLD_CTX} \
    -f samples/helloworld/helloworld.yaml \
    -l app=helloworld -l version="v1" -n sample
}

function deployLocalServiceEntry()
{
  local IP=$(kubectl --context=$HELLOWORLD_CTX get svc helloworld -n sample -o jsonpath='{.spec.clusterIP}')
  local PORT="5000"
  deployServiceEntry $HELLOWORLD_CTX $IP $PORT
}

function deployRemoteServiceEntry()
{
  local IP=$(kubectl --context=$HELLOWORLD_CTX get svc --selector=app=istio-ingressgateway \
    -n istio-system -o jsonpath='{.items[0].status.loadBalancer.ingress[0].ip}')
  local PORT="15443"
  deployServiceEntry $OTHER_CTX $IP $PORT
}

function deployServiceEntry()
{
  local CTX=$1
  local IP=$2
  local PORT=$3

  # Deploy HelloWorld ServiceEntry for resolving .global.
  kubectl apply --context=${CTX} -n sample -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: helloworld-global
spec:
  hosts:
  # must be of form name.namespace.global
  - helloworld.sample.global
  # Treat remote cluster services as part of the service mesh
  # as all clusters in the service mesh share the same root of trust.
  location: MESH_INTERNAL
  ports:
  - name: http
    number: 5000
    protocol: http
  resolution: DNS
  addresses:
  # the IP address to which httpbin.bar.global will resolve to
  # must be unique for each remote service, within a given cluster.
  # This address need not be routable. Traffic for this IP will be captured
  # by the sidecar and routed appropriately.
  - 240.0.0.2
  endpoints:
  - address: ${IP}
    ports:
      http: ${PORT}
EOF
}

# Delete the namespace in all clusters
deleteNamespace

# Create the namespace in all clusters
createNamespace

# Deploy the sleep service to all clusters.
deploySleep

# Deploy the HelloWorld and sleep services to each cluster.
deployHelloWorldToFirstCluster

deployLocalServiceEntry
deployRemoteServiceEntry