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CLIENTS - sleep (TLS Mode can be "SIMPLE" or ISTIO_MUTUAL)
Diagram
draw.io Diagram |
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border | true |
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diagramName | us-to-us intent |
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simpleViewer | false |
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width | |
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links | auto |
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tbstyle | top |
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lbox | true |
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diagramWidth | 1136 |
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revision | 4 |
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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
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Add Inbound service
The intent for this scenario
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Code Block |
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language | js |
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theme | Midnight |
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title | POST |
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linenumbers | true |
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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": "httpbin" //actual name of the client service
"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": "ISTIO_MUTUALDISABLE", // Support 2 modes. SIMPLE and ISTIO_MUTUAL, For external Client, it is SIMPLE and MUTUAL (caCertificate required)
"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
"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": "servicehttpbin"
"Message": "inbound service created"
} |
Add Clients
POST - traffic intent to add clients for accessing a specific inbound service
Code Block |
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language | js |
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theme | Midnight |
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title | POST |
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linenumbers | true |
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URL: /v2/projects/{project-name}/composite-apps/{composite-app-name}/{version}/traffic-group-intent/uservice-to-uservice-intent/clients
POST BODY:
{
"metadata": {
"name": "<name>" // unique name for each intent
"description": "connectivity intent add client communication"
"application": "<app1>",
"userdata1": <>,
"userdata2": <>
}
spec: {
"clientServiceName": "sleep", // Name of the client service
"headless": "false", // default is false. Option "True" will generate the required configs for all the instances of headless service
"mTLS": "DISABLE", // will be the same as that of inbound service, if both are part of same logical cloud
}
}
RETURN STATUS: 201
RETURN BODY:
{
"name": "sleep"
"Message": "Client created"
} |
Add Security details for clients
WARNING - This task requires mutual TLS enabled because the following examples use principal and namespace in the policies
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Name of the Cluster | Microservice | Istio Configuration | Comments |
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Cluster01 | - sleep
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Microservice | Resource |
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common | serviceEntry (httpbin) | sleep | destinationRule for simple TLS |
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Cluster02 | httpbin |
Microservice | Resource |
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httpbin | destinationRule for simple TLS, Loadbalancing and circuit breaking AuthorizationPolicy for Access Control
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Cluster01 Resources
1. ServiceEntry - To enable sleep to access httpbin
Code Block |
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language | yml |
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theme | Eclipse |
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title | ServiceEntry |
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linenumbers | true |
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apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
name: servicename-httpbin
spec:
hosts:
- httpbin.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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2. DestinationRule for TLS - sleep
Code Block |
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language | yml |
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theme | Eclipse |
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title | DestinationRule |
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linenumbers | true |
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apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: sleep-dr
namespace: default
spec:
host: "sleep.default.svc.cluster.local"
trafficPolicy:
tls:
mode: ISTIO_MUTUALDISABLE
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Cluster 02 Resources
1. DestinationRule for simple TLS, Loadbalancing and circuit breaking - httpbin
Code Block |
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language | yml |
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theme | Eclipse |
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title | DestinationRule |
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linenumbers | true |
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apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: httpbin-dr
namespace: default
spec:
host: "httpbin.default.svc.cluster.local"
trafficPolicy:
tls:
mode: ISTIO_MUTUALDISABLE
loadbalancer:
consistentHash:
httpCookie: "user1"
connectionPool:
tcp:
maxConnections: 10
http:
http2MaxRequests: 1000
maxRequestsPerConnection: 100
outlierDetection:
consecutiveErrors: 7
interval: 5m
baseEjectionTime: 15m
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2. AuthorizationPolicy
Code Block |
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language | yml |
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theme | Eclipse |
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title | AuthorizationPolicy |
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linenumbers | true |
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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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