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Drawio
bordertrue
diagramNameus-to-us intent
simpleViewerfalse
width
linksauto
tbstyletop
lboxtrue
diagramWidth15481688
revision56


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"

Important Info - cert-chain.pem is Envoy’s cert that needs to be presented to the other side. key.pem is Envoy’s private key paired with Envoy’s cert in cert-chain.pem. root-cert.pem is the root cert to verify the peer’s cert. In this example, we only have one Citadel in a cluster, so all Envoys have the same root-cert.pem.

Add Inbound service 01

POST - traffic intent for the inbound service (service hosted behind the cluster)

Code Block
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titlePOST
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URL: /v2/projects/{project-name}/composite-apps/{compositeblue-app-name}/{version}/traffic-intent-set/us-to-us-intentsinbound-intent/

POST BODY:
{
	"metadata": {
	"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": "httpbin" //actual name of the client service - {istioobject - serviceEntry of client's cluster}
	"externName": ""
	"protocol": "HTTP",
	"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": "MUTUAL", // default is simple. Option MUTUAL will enforce mtls {istioobject - destinationRule}
	"port" : "80", // port on which service is exposed as through servicemesh, not the port it is actually running on
	"serviceMesh": "istio", // get it from cluster record
	"istiosidecar-proxy": "yes", // The features (mTLS, LB, Circuit breaking) are not avaialbleavailable to services without istio-proxy. Only inbound routing is possible.

	traffic-management-info : {
	// 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 - {istioobject - destinationRule}
	"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 - {istioobject - destinationRule}
	"httpCookie": "user1" // Name of the cookie to maitain stick sessions - {istioobject - destinationRule}

	// Circuit Breaking
	"maxConnections": 10 //connection pool for tcp and http traffic - {istioobject - destinationRule}
	"concurrenthttp2Requests": 1000 // concurent http2 requests which can be allowed - {istioobject - destinationRule}
	"httpRequestPerConnection": 100 //number of http requests per connection. Valid only for http traffic - {istioobject - destinationRule}
	"consecutiveErrors": 8 // Default is 5.  Number of consecutive error before the host is removed from load balancing pool - {istioobject - destinationRule}
	"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 - {istioobject - destinationRule}
	"intervalSweep": 5m, //time limit before the removed hosts are added back to the load balancing pool. - {istioobject - destinationRule}
}

	// credentials for mTLS.
	"Servicecertificate" : "" // Present actual certificate here.
	"ServicePrivateKey" : "" // Present actual private key here.
	"caCertificate" : "" // present the trusted certificate to verify the client connection, Required only when mtls mode is MUTUAL

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

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

...

Add Security detail for a client of inbound service 01

WARNING - This task requires mutual TLS enabled because the following examples use principal and namespace in the policies

Code Block
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titleGET
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URL: /v2/projects/{project-name}/composite-apps/{composite-app-name}/{version}/traffic-group-intent/uservice-to-uservice-intent/clients/sleep/security/security-intent
{
	"metadata": {
	"name": "<name>" // unique name for each intent
    "description": "Security intent"
	"application": "<app1>",
	"userdata1": <>,
	"userdata2": <>
	}

	spec:{
	serviceAccountAccess : {[ "cluster.local/ns/default/sa/sleep": ["GET": "/status"]} // {istioobject - authorizationPolicy, will be applied for the inbound service}
	}
}

RETURN STATUS: 201
RETURN BODY:
{ 
  "name": "<name>"
  "Message": "Security Rule created"
}
Add  another Security detail for a client of inbound service 01

WARNING - This task requires mutual TLS enabled because the following examples use principal and namespace in the policies

Code Block
languagejs
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titleGET
linenumberstrue
URL: /v2/projects/{project-name}/composite-apps/{composite-app-name}/{version}/traffic-group-intent/uservice-to-uservice-intent/clients/sleep/security/security-intent
{
	"metadata": {
	"name": "<name>" // unique name for each intent
    "description": "Security intent"
	"application": "<app1>",
	"userdata1": <>,
	"userdata2": <>
	}

	spec:{
	serviceAccountAccess : {"cluster.local/ns/default/sa/sleep" : ["GET": "/headers"]} // {istioobject - authorizationPolicy, will be applied for the inbound service}
	}
}

RETURN STATUS: 201
RETURN BODY:
{ 
  "name": "<name>"
  "Message": "Security Rule created"
}

...

Add Security detail 01 for client 01

WARNING - This task requires mutual TLS enabled because the following examples use principal and namespace in the policies

Code Block
languagejs
themeMidnight
titleGET
linenumberstrue
URL: /v2/projects/{project-name}/composite-apps/{composite-app-name}/{version}/traffic-group-intent/uservice-to-uservice-intent/clients/sleep/security/security-intent
{
	"metadata": {
	"name": "<name>" // unique name for each intent
    "description": "Security intent"
	"application": "<app1>",
	"userdata1": <>,
	"userdata2": <>
	}

	spec:{
	serviceAccountAccess : {"cluster.local/ns/default/sa/sleep": {"GET": "/static"}} // {istioobject - authorizationPolicy, will be applied for the inbound service}
	}
}

RETURN STATUS: 201
RETURN BODY:
{ 
  "name": "<name>"
  "Message": "Security Rule created"
}
Add Security detail 02 for client 01

WARNING - This task requires mutual TLS enabled because the following examples use principal and namespace in the policies

Code Block
languagejs
themeMidnight
titleGET
linenumberstrue
URL: /v2/projects/{project-name}/composite-apps/{composite-app-name}/{version}/traffic-group-intent/uservice-to-uservice-intent/clients/sleep/security/security-intent
{
	"metadata": {
	"name": "<name>" // unique name for each intent
    "description": "Security intent"
	"application": "<app1>",
	"userdata1": <>,
	"userdata2": <>
	}

	spec:{
	serviceAccountAccess : {"cluster.local/ns/default/sa/sleep" : {"GET": "/api/v1/products"}} // {istioobject - authorizationPolicy, will be applied for the inbound service}
	}
}

RETURN STATUS: 201
RETURN BODY:
{ 
  "name": "<name>"
  "Message": "Security Rule created"
}

...

Add Security details for client 02

WARNING - This task requires mutual TLS enabled because the following examples use principal and namespace in the policies

Code Block
languagejs
themeMidnight
titleGET
linenumberstrue
URL: /v2/projects/{project-name}/composite-apps/{composite-app-name}/{version}/traffic-group-intent/uservice-to-uservice-intent/clients/sleep/security/security-intent
{
	"metadata": {
	"name": "<name>" // unique name for each intent
    "description": "Security intent"
	"application": "<app1>",
	"userdata1": <>,
	"userdata2": <>
	}

	spec:{
	serviceAccountAccess : {"cluster.local/ns/default/sa/sleep": {"GET": "/api/v1/products"}}, // {istioobject - authorizationPolicy, will be applied for the inbound service}
	}
}

RETURN STATUS: 201
RETURN BODY:
{ 
  "name": "<name>"
  "Message": "Security Rule created"
}

...

Code Block
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titleServiceEntry
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apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: service-entry-httpbin
  namespace: namespace01 <> // namespace where the client service are deployed
spec:
  hosts:
  - httpbin.namespace02<namespace_of_service>.logicalcloud02
  # 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 // IP of the istio-ingress-gateway
    ports:
      http1: 15443 //Sni. Do not change this

...

Code Block
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titleDestinationRule
linenumberstrue
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: sleep-dr
  namespace: default<namespace_of_sleep>
spec:
  host: "sleep.namespace01.svc.cluster.local"
  trafficPolicy:
    tls:
      mode: MUTUAL
      serverCertificate: /etc/certs/cert-chain.pem
      privateKey: /etc/certs/key.pem
      caCertificates: /etc/certs/root-cert.pem

...

Code Block
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titleDestinationRule
linenumberstrue
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: bookinfo-productpage-dr
  namespace: default<namespace_of_productpage>
spec:
  host: "productpage.namespace02.svc.cluster.local"
  trafficPolicy:
    tls:
	  mode: MUTUAL
      serverCertificate: /etc/certs/cert-chain.pem
      privateKey: /etc/certs/key.pem
      caCertificates: /etc/certs/root-cert.pem
    loadbalancer:
      consistentHash:
        httpCookie: "user2"
    connectionPool:
      tcp:
        maxConnections: 10
      http:
        http2MaxRequests: 1000
        maxRequestsPerConnection: 100
    outlierDetection:
      consecutiveErrors: 7
      interval: 5m
      baseEjectionTime: 15m

...

Code Block
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titleAuthorizationPolicy
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apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
 name: deny-all
 namespace: default<namespace_of_prodfuct-page>
spec:
  selector:
   matchLabels:
     app: <name_used_for_productpage>
  rules:
  - from:
    - source:
        principals: ["cluster.global/ns/default/sa/sleep", "cluster.global/ns/default/sa/bookinfo-user" ]
    to:
    - operation:
        methods: ["GET"]
        paths: ["/static*"]
    - operation:
        methods: ["GET"]
        paths: ["/api/v1/products"]

...

Code Block
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themeEclipse
titleDestinationRule
linenumberstrue
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: sleep-dr
  namespace: namespace01
spec:
  host: "bookinfo-user"
  trafficPolicy:
    tls:
	  mode: MUTUAL
      serverCertificate: /etc/certs/cert-chain.pem
      privateKey: /etc/certs/key.pem
      caCertificates: /etc/certs/root-cert.pem


4.  DestinationRule for simple TLS, Loadbalancing and circuit breaking for httpbin - (logicalCloud02)
Code Block
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titleDestinationRule
linenumberstrue
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: httpbin-dr
  namespace: namespace02
spec:
  host: "httpbin"
  trafficPolicy:
    tls:
      mode: MUTUAL
	  serverCertificate: /etc/certs/cert-chain.pem
      privateKey: /etc/certs/key.pem
      caCertificates: /etc/certs/root-cert.pem
    loadbalancer:
      consistentHash:
        httpCookie: "user1"
    connectionPool:
      tcp:
        maxConnections: 10
      http:
        http2MaxRequests: 1000
        maxRequestsPerConnection: 100
    outlierDetection:
      consecutiveErrors: 7
      interval: 5m
      baseEjectionTime: 15m

...