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In the below diagram, 

SERVER - httpbin (If TLS Mode is "SIIMPLE", it will accept both traffic for tls and plain text. TLS Mode must be ISTIO_MUTUAL for talking to other istio clients and MUTUAL (with ca) when talking to other external services)

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draw.io Diagram
bordertrue
diagramNameus-to-us intent
simpleViewerfalse
width
linksauto
tbstyletop
lboxtrue
diagramWidth1136
revision12


NOTE - For this scenario, the default mesh wide policy must be set to "PERMISSIVE" on both the clusters. It will not work if the default Mesh Policy is "STRICT"

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Code Block
languagejs
themeMidnight
titlePOST
linenumberstrue
URL: /v2/projects/{project-name}/composite-apps/{composite-app-name}/{version}/traffic-intent-set/us-to-us-intents/

POST BODY:
{
	"metadata": {
	"name": "<name>" // unique name for each intent
    "description": "connectivity intent for stateless micro-service to stateless micro-service communication"
	"userdata1": <>,
	"userdata2": <>
	}

	"spec": { // update the memory allocation for each field as per OpenAPI standards
	"application": "<app1>",
	"servicename": "httpbinnginx" //actual name of the client service
	"protocol": "HTTPHTTPS",
	"headless": "false", // default is false. Option "True" will make sure all the instances of the headless service will have access to the client service
	"mutualTLS": "DISABLE", // Support 2 modes. SIMPLE and ISTIO_MUTUAL, For external Client, it is SIMPLE and MUTUAL (caCertificate required)
	"port" : "80443", // port on which service is exposed as through servicemesh, not the port it is actually running on
	"serviceMesh": "istio", // get it from cluster record
	"istio-proxy": "yes", // The features (mTLS, LB, Circuit breaking) are no avaialble to services without istio-proxy. Only inbound routing is possible.

	// Traffic configuration - Loadbalancing is applicable per service. The traffic to this service is distrbuted amongst the pods under it.
	"loadbalancingType": "ConsistenHash", // "Simple" and "consistentHash" are the two modes
	"loadBalancerMode": "httpCookie" // Modes for consistentHash - "httpHeaderName", "httpCookie", "useSourceIP", "minimumRingSize", Modes for simple - "LEAST_CONN", "ROUND_ROBIN", "RANDOM", "PASSTHROUGH" // choices of the mode must be explicit
	"httpCookie": "user1" // Name of the cookie to maitain stick sessions

	// Circuit Breaking
	"maxConnections": 10 //connection pool for tcp and http traffic
	"concurrenthttp2Requests": 1000 // concurent http2 requests which can be allowed
	"httpRequestPerConnection": 100 //number of http requests per connection. Valid only for http traffic
	"consecutiveErrors": 8 // Default is 5.  Number of consecutive error before the host is removed from load balancing pool
	"baseEjectionTime" : 15 // Default is 5, time for which the host will be removed from load balancing pool when it returns error for no of times more than "consecutiveErrors" limit
	"intervalSweep": 5m, //time limit before the removed hosts are added back to the load balancing pool.

	// credentials for mTLS. Not required in this scenario since the services are in one logical cloud with common rootCA. ISTIO_MUTUAL is enabled by default.
	"Servicecertificate" : "" // Present actual certificate here.
	"ServicePrivateKey" : "" // Present actual private key here.

	// Access Control
	namespaces: [] // Workloads from this namespaces can access the inbound service
	
	}
}

RETURN STATUS: 201
RETURN BODY: 
{ 
  "name": "servicehttpbinservice"
  "Message": "inbound service created"
}

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Name of the ClusterMicroserviceIstio ConfigurationComments
Cluster01
  1. sleep 


MicroserviceResource
commonserviceEntry (httpbin)
sleepdestinationRule for simple TLS






Cluster02httpbin


MicroserviceResource
httpbinnginx

destinationRule for simple TLS, Loadbalancing and circuit breaking

AuthorizationPolicy for Access Control




Cluster01 Resources

1. ServiceEntry - To enable sleep to access

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nginx
Code Block
languageyml
themeEclipse
titleServiceEntry
linenumberstrue
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: servicename-httpbin
spec:
  hosts:
  - httpbinnginx.default.global
  # template for the remote service name - <servicename.namespace.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: http1
    number: 8000
    protocol: http
  resolution: DNS
  addresses:
  # the IP address to which httpbin.<namespace>.<logicalcloudname> 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:
  # This is the routable address of the istio ingress gateway in cluster02
  # routed to this address.
  - address: 172.25.55.50
    ports:
      http1: 15443 //Sni. Do not change this

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Code Block
languageyml
themeEclipse
titleDestinationRule
linenumberstrue
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: sleep-dr
  namespace: default
spec:
  host: "sleep.default.svc.cluster.local"
  trafficPolicy:
    tls:
      mode: DISABLE


Cluster 02 Resources

1.  DestinationRule for simple TLS, Loadbalancing and circuit breaking -

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Code Block
languageyml
themeEclipse
titleDestinationRule
linenumberstrue
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: httpbin-dr
  namespace: default
spec:
  host: "httpbin.default.svc.cluster.local"
  trafficPolicy:
    tls:
      mode: DISABLE
    loadbalancer:
      consistentHash:
        httpCookie: "user1"
    connectionPool:
      tcp:
        maxConnections: 10
      http:
        http2MaxRequests: 1000
        maxRequestsPerConnection: 100
    outlierDetection:
      consecutiveErrors: 7
      interval: 5m
      baseEjectionTime: 15m

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Code Block
languageyml
themeEclipse
titleAuthorizationPolicy
linenumberstrue
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
 name: deny-all
 namespace: default
spec:
  selector:
   matchLabels:
     app: httpbin
  rules:
  - from:
    - source:
        principals: ["cluster.local/ns/default/sa/sleep"]
    to:
    - operation:
        methods: ["GET"]
        paths: ["/status*"]
    - operation:
        methods: ["POST"]
        paths: ["/headers"]

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