Global Mesh Options

Configuration affecting the service mesh as a whole.

AuthenticationPolicy

AuthenticationPolicy defines authentication policy. It can be set for different scopes (mesh, service …), and the most narrow scope with non-INHERIT value will be used. Mesh policy cannot be INHERIT.

NameDescription
NONE

Do not encrypt Envoy to Envoy traffic.

MUTUAL_TLS

Envoy to Envoy traffic is wrapped into mutual TLS connections.

INHERIT

Use the policy defined by the parent scope. Should not be used for mesh policy.

Certificate

Certificate configures the provision of a certificate and its key. Example 1: key and cert stored in a secret { secretName: galley-cert secretNamespace: istio-system dnsNames: - galley.istio-system.svc - galley.mydomain.com } Example 2: key and cert stored in a directory { dnsNames: - pilot.istio-system - pilot.istio-system.svc - pilot.mydomain.com }

FieldTypeDescriptionRequired
secretNamestring

Name of the secret the certificate and its key will be stored into. If it is empty, it will not be stored into a secret. Instead, the certificate and its key will be stored into a hard-coded directory.

No
dnsNamesstring[]

The DNS names for the certificate. A certificate may contain multiple DNS names.

No

ConfigSource

ConfigSource describes information about a configuration store inside a mesh. A single control plane instance can interact with one or more data sources.

FieldTypeDescriptionRequired
addressstring

Address of the server implementing the Istio Mesh Configuration protocol (MCP). Can be IP address or a fully qualified DNS name. Use fs:/// to specify a file-based backend with absolute path to the directory.

No
tlsSettingsTLSSettings

Use the tlssettings to specify the tls mode to use. If the MCP server uses Istio mutual TLS and shares the root CA with Pilot, specify the TLS mode as ISTIOMUTUAL.

No
subscribedResourcesResource[]

Describes the source of configuration, if nothing is specified default is MCP

No

MeshConfig

MeshConfig defines mesh-wide variables shared by all Envoy instances in the Istio service mesh.

NOTE: This configuration type should be used for the low-level global configuration, such as component addresses and port numbers. It should not be used for the features of the mesh that can be scoped by service or by namespace. Some of the fields in the mesh config are going to be deprecated and replaced with several individual configuration types (for example, tracing configuration).

FieldTypeDescriptionRequired
mixerCheckServerstring

Address of the server that will be used by the proxies for policy check calls. By using different names for mixerCheckServer and mixerReportServer, it is possible to have one set of Mixer servers handle policy check calls while another set of Mixer servers handle telemetry calls.

NOTE: Omitting mixerCheckServer while specifying mixerReportServer is equivalent to setting disablePolicyChecks to true.

No
mixerReportServerstring

Address of the server that will be used by the proxies for policy report calls.

No
disablePolicyChecksbool

Disable policy checks by the Mixer service. Default is false, i.e. Mixer policy check is enabled by default.

No
policyCheckFailOpenbool

Allow all traffic in cases when the Mixer policy service cannot be reached. Default is false which means the traffic is denied when the client is unable to connect to Mixer.

No
sidecarToTelemetrySessionAffinitybool

Enable session affinity for Envoy Mixer reports so that calls from a proxy will always target the same Mixer instance.

No
proxyListenPortint32

Port on which Envoy should listen for incoming connections from other services.

No
proxyHttpPortint32

Port on which Envoy should listen for HTTP PROXY requests if set.

No
connectTimeoutDuration

Connection timeout used by Envoy. (MUST BE >=1ms)

No
protocolDetectionTimeoutDuration

Automatic protocol detection uses a set of heuristics to determine whether the connection is using TLS or not (on the server side), as well as the application protocol being used (e.g., http vs tcp). These heuristics rely on the client sending the first bits of data. For server first protocols like MySQL, MongoDB, etc., Envoy will timeout on the protocol detection after the specified period, defaulting to non mTLS plain TCP traffic. Set this field to tweak the period that Envoy will wait for the client to send the first bits of data. (MUST BE >=1ms)

No
tcpKeepaliveTcpKeepalive

If set then set SO_KEEPALIVE on the socket to enable TCP Keepalives.

No
ingressClassstring

Class of ingress resources to be processed by Istio ingress controller. This corresponds to the value of “kubernetes.io/ingress.class” annotation.

No
ingressServicestring

Name of theKubernetes service used for the istio ingress controller.

No
ingressControllerModeIngressControllerMode

Defines whether to use Istio ingress controller for annotated or all ingress resources.

No
enableTracingbool

Flag to control generation of trace spans and request IDs. Requires a trace span collector defined in the proxy configuration.

No
accessLogFilestring

File address for the proxy access log (e.g. /dev/stdout). Empty value disables access logging.

No
accessLogFormatstring

Format for the proxy access log Empty value results in proxy’s default access log format

No
accessLogEncodingAccessLogEncoding

Encoding for the proxy access log (text or json). Default value is text.

No
enableEnvoyAccessLogServicebool

This flag enables Envoy’s gRPC Access Log Service. See Access Log Service for details about Envoy’s gRPC Access Log Service API.

No
defaultConfigProxyConfig

Default proxy config used by the proxy injection mechanism operating in the mesh (e.g. Kubernetes admission controller) In case of Kubernetes, the proxy config is applied once during the injection process, and remain constant for the duration of the pod. The rest of the mesh config can be changed at runtime and config gets distributed dynamically.

No
outboundTrafficPolicyOutboundTrafficPolicy

Set the default behavior of the sidecar for handling outbound traffic from the application. If your application uses one or more external services that are not known apriori, setting the policy to ALLOWANY will cause the sidecars to route any unknown traffic originating from the application to its requested destination. Users are strongly encouraged to use ServiceEntries to explicitly declare any external dependencies, instead of using allowany, so that traffic to these services can be monitored.

No
enableClientSidePolicyCheckbool

Enables client side policy checks.

No
sdsUdsPathstring

Unix Domain Socket through which Envoy communicates with NodeAgent SDS to get key/cert for mTLS. Use secret-mount files instead of SDS if set to empty.

No
configSourcesConfigSource[]

ConfigSource describes a source of configuration data for networking rules, and other Istio configuration artifacts. Multiple data sources can be configured for a single control plane.

No
enableAutoMtlsBoolValue

This flag is used to enable mutual TLS automatically for service to service communication within the mesh, default false. If set to true, and a given service does not have a corresponding DestinationRule configured, or its DestinationRule does not have TLSSettings specified, Istio configures client side TLS configuration appropriately. More specifically, If the upstream authentication policy is in STRICT mode, use Istio provisioned certificate for mutual TLS to connect to upstream. If upstream service is in plain text mode, use plain text. If the upstream authentication policy is in PERMISSIVE mode, Istio configures clients to use mutual TLS when server sides are capable of accepting mutual TLS traffic. If service DestinationRule exists and has TLSSettings specified, that is always used instead.

No
trustDomainstring

The trust domain corresponds to the trust root of a system. Refer to SPIFFE-ID

No
trustDomainAliasesstring[]

The trust domain aliases represent the aliases of trust_domain. For example, if we have

trustDomain: td1
trustDomainAliases: ["td2", "td3"]

Any service with the identity td1/ns/foo/sa/a-service-account, td2/ns/foo/sa/a-service-account, or td3/ns/foo/sa/a-service-account will be treated the same in the Istio mesh.

No
defaultServiceExportTostring[]

The default value for the ServiceEntry.export_to field and services imported through container registry integrations, e.g. this applies to Kubernetes Service resources. The value is a list of namespace names and reserved namespace aliases. The allowed namespace aliases are:

  • - All Namespaces . - Current Namespace ~ - No Namespace

If not set the system will use “*” as the default value which implies that services are exported to all namespaces.

‘All namespaces’ is a reasonable default for implementations that don’t need to restrict access or visibility of services across namespace boundaries. If that requirement is present it is generally good practice to make the default ‘Current namespace’ so that services are only visible within their own namespaces by default. Operators can then expand the visibility of services to other namespaces as needed. Use of ‘No Namespace’ is expected to be rare but can have utility for deployments where dependency management needs to be precise even within the scope of a single namespace.

For further discussion see the reference documentation for ServiceEntry, Sidecar, and Gateway.

No
defaultVirtualServiceExportTostring[]

The default value for the VirtualService.exportto field. Has the same syntax as ‘defaultserviceexportto’.

If not set the system will use “*” as the default value which implies that virtual services are exported to all namespaces

No
defaultDestinationRuleExportTostring[]

The default value for the DestinationRule.exportto field. Has the same syntax as ‘defaultserviceexportto’.

If not set the system will use “*” as the default value which implies that destination rules are exported to all namespaces

No
rootNamespacestring

The namespace to treat as the administrative root namespace for Istio configuration. When processing a leaf namespace Istio will search for declarations in that namespace first and if none are found it will search in the root namespace. Any matching declaration found in the root namespace is processed as if it were declared in the leaf namespace.

The precise semantics of this processing are documented on each resource type.

No
localityLbSettingLocalityLoadBalancerSetting

Locality based load balancing distribution or failover settings.

No
dnsRefreshRateDuration

Configures DNS refresh rate for Envoy clusters of type STRICT_DNS

No
disableReportBatchbool

The flag to disable report batch.

No
reportBatchMaxEntriesuint32

When disablereportbatch is false, this value specifies the maximum number of requests that are batched in report. If left unspecified, the default value of reportbatchmax_entries == 0 will use the hardcoded defaults of istio::mixerclient::ReportOptions.

No
reportBatchMaxTimeDuration

When disablereportbatch is false, this value specifies the maximum elapsed time a batched report will be sent after a user request is processed. If left unspecified, the default reportbatchmax_time == 0 will use the hardcoded defaults of istio::mixerclient::ReportOptions.

No
h2UpgradePolicyH2UpgradePolicy

Specify if http1.1 connections should be upgraded to http2 by default. if sidecar is installed on all pods in the mesh, then this should be set to UPGRADE. If one or more services or namespaces do not have sidecar(s), then this should be set to DONOTUPGRADE. It can be enabled by destination using the destinationRule.trafficPolicy.connectionPool.http.h2UpgradePolicy override.

No
inboundClusterStatNamestring

Name to be used while emitting statistics for inbound clusters. By default, Istio emits statistics with the pattern inbound|||. For example inbound|7443|grpc-reviews|reviews.prod.svc.cluster.local. This can be used to override that pattern.

A Pattern can be composed of various pre-defined variables. The following variables are supported. %SERVICE% - Will be substituted with name of the service. %SERVICEFQDN% - Will be substituted with FQDN of the service. %SERVICEPORT% - Will be substituted with port of the service. %SERVICEPORTNAME% - Will be substituted with port name of the service.

Following are some examples of supported patterns for reviews. %SERVICEFQDN%%SERVICEPORT% will use reviews.prod.svc.cluster.local7443 as the stats name. %SERVICE% will use reviews.prod as the stats name.

No
outboundClusterStatNamestring

Name to be used while emitting statistics for outbound clusters. By default, Istio emits statistics with the pattern outbound|||. For example outbound|8080|v2|reviews.prod.svc.cluster.local. This can be used to override that pattern.

A Pattern can be composed of various pre-defined variables. The following variables are supported. %SERVICE% - Will be substituted with name of the service. %SERVICEFQDN% - Will be substituted with FQDN of the service. %SERVICEPORT% - Will be substituted with port of the service. %SERVICEPORTNAME% - Will be substituted with port name of the service. %SUBSET_NAME% - Will be substituted with subset.

Following are some examples of supported patterns for reviews. %SERVICEFQDN%%SERVICEPORT% will use reviews.prod.svc.cluster.local7443 as the stats name. %SERVICE% will use reviews.prod as the stats name.

No
certificatesCertificate[]

Configure the provision of certificates.

No

MeshConfig.AccessLogEncoding

NameDescription
TEXT
JSON

MeshConfig.H2UpgradePolicy

Default Policy for upgrading http1.1 connections to http2.

NameDescription
DO_NOT_UPGRADE

Do not upgrade connections to http2.

UPGRADE

Upgrade the connections to http2.

MeshConfig.IngressControllerMode

NameDescription
OFF

Disables Istio ingress controller.

DEFAULT

Istio ingress controller will act on ingress resources that do not contain any annotation or whose annotations match the value specified in the ingress_class parameter described earlier. Use this mode if Istio ingress controller will be the default ingress controller for the entireKubernetes cluster.

STRICT

Istio ingress controller will only act on ingress resources whose annotations match the value specified in the ingress_class parameter described earlier. Use this mode if Istio ingress controller will be a secondary ingress controller (e.g., in addition to a cloud-provided ingress controller).

MeshConfig.OutboundTrafficPolicy

FieldTypeDescriptionRequired
modeModeNo

MeshConfig.OutboundTrafficPolicy.Mode

NameDescription
REGISTRY_ONLY

outbound traffic will be restricted to services defined in the service registry as well as those defined through ServiceEntries

ALLOW_ANY

outbound traffic to unknown destinations will be allowed, in case there are no services or ServiceEntries for the destination port

MeshNetworks

MeshNetworks (config map) provides information about the set of networks inside a mesh and how to route to endpoints in each network. For example

MeshNetworks(file/config map):

networks:
  network1:
  - endpoints:
    - fromRegistry: registry1 #must match kubeconfig name in Kubernetes secret
    - fromCidr: 192.168.100.0/22 #a VM network for example
    gateways:
    - registryServiceName: istio-ingressgateway.istio-system.svc.cluster.local
      port: 15443
      locality: us-east-1a
    - address: 192.168.100.1
      port: 15443
      locality: us-east-1a
FieldTypeDescriptionRequired
networksmap<string, Network>

The set of networks inside this mesh. Each network should have a unique name and information about how to infer the endpoints in the network as well as the gateways associated with the network.

Yes

Network

Network provides information about the endpoints in a routable L3 network. A single routable L3 network can have one or more service registries. Note that the network has no relation to the locality of the endpoint. The endpoint locality will be obtained from the service registry.

FieldTypeDescriptionRequired
endpointsNetworkEndpoints[]

The list of endpoints in the network (obtained through the constituent service registries or from CIDR ranges). All endpoints in the network are directly accessible to one another.

Yes
gatewaysIstioNetworkGateway[]

Set of gateways associated with the network.

Yes

Network.IstioNetworkGateway

The gateway associated with this network. Traffic from remote networks will arrive at the specified gateway:port. All incoming traffic must use mTLS.

FieldTypeDescriptionRequired
registryServiceNamestring (oneof)

A fully qualified domain name of the gateway service. Pilot will lookup the service from the service registries in the network and obtain the endpoint IPs of the gateway from the service registry. Note that while the service name is a fully qualified domain name, it need not be resolvable outside the orchestration platform for the registry. e.g., this could be istio-ingressgateway.istio-system.svc.cluster.local.

Yes
addressstring (oneof)

IP address or externally resolvable DNS address associated with the gateway.

Yes
portuint32

The port associated with the gateway.

Yes
localitystring

The locality associated with an explicitly specified gateway (i.e. ip)

No

Network.NetworkEndpoints

NetworkEndpoints describes how the network associated with an endpoint should be inferred. An endpoint will be assigned to a network based on the following rules:

  1. Implicitly: If the registry explicitly provides information about the network to which the endpoint belongs to. In some cases, its possible to indicate the network associated with the endpoint by adding the ISTIO_META_NETWORK environment variable to the sidecar.

  2. Explicitly:

a. By matching the registry name with one of the “fromRegistry” in the mesh config. A “from_registry” can only be assigned to a single network.

b. By matching the IP against one of the CIDR ranges in a mesh config network. The CIDR ranges must not overlap and be assigned to a single network.

(2) will override (1) if both are present.

FieldTypeDescriptionRequired
fromCidrstring (oneof)

A CIDR range for the set of endpoints in this network. The CIDR ranges for endpoints from different networks must not overlap.

Yes
fromRegistrystring (oneof)

Add all endpoints from the specified registry into this network. The names of the registries should correspond to the kubeconfig file name inside the secret that was used to configure the registry (Kubernetes multicluster) or supplied by MCP server.

Yes

ProxyConfig

ProxyConfig defines variables for individual Envoy instances.

FieldTypeDescriptionRequired
configPathstring

Path to the generated configuration file directory. Proxy agent generates the actual configuration and stores it in this directory.

No
binaryPathstring

Path to the proxy binary

No
serviceClusterstring

Service cluster defines the name for the service_cluster that is shared by all Envoy instances. This setting corresponds to –service-cluster flag in Envoy. In a typical Envoy deployment, the service-cluster flag is used to identify the caller, for source-based routing scenarios.

Since Istio does not assign a local service/service version to each Envoy instance, the name is same for all of them. However, the source/caller’s identity (e.g., IP address) is encoded in the –service-node flag when launching Envoy. When the RDS service receives API calls from Envoy, it uses the value of the service-node flag to compute routes that are relative to the service instances located at that IP address.

No
drainDurationDuration

The time in seconds that Envoy will drain connections during a hot restart. MUST be >=1s (e.g., 1s/1m/1h)

No
parentShutdownDurationDuration

The time in seconds that Envoy will wait before shutting down the parent process during a hot restart. MUST be >=1s (e.g., 1s/1m/1h). MUST BE greater than drainduration_ parameter.

No
discoveryAddressstring

Address of the discovery service exposing xDS with mTLS connection.

No
connectTimeoutDuration

Connection timeout used by Envoy for supporting services. (MUST BE >=1ms)

No
statsdUdpAddressstring

IP Address and Port of a statsd UDP listener (e.g. 10.75.241.127:9125).

No
proxyAdminPortint32

Port on which Envoy should listen for administrative commands.

No
controlPlaneAuthPolicyAuthenticationPolicy

Authentication policy defines the global switch to control authentication for Envoy-to-Envoy communication for istio components Mixer and Pilot.

No
customConfigFilestring

File path of custom proxy configuration, currently used by proxies in front of Mixer and Pilot.

No
statNameLengthint32

Maximum length of name field in Envoy’s metrics. The length of the name field is determined by the length of a name field in a service and the set of labels that comprise a particular version of the service. The default value is set to 189 characters. Envoy’s internal metrics take up 67 characters, for a total of 256 character name per metric. Increase the value of this field if you find that the metrics from Envoys are truncated.

No
concurrencyint32

The number of worker threads to run. Default value is number of cores on the machine.

No
proxyBootstrapTemplatePathstring

Path to the proxy bootstrap template file

No
interceptionModeInboundInterceptionMode

The mode used to redirect inbound traffic to Envoy.

No
tracingTracing

Tracing configuration to be used by the proxy.

No
sdsSDS

secret discovery service(SDS) configuration to be used by the proxy.

No
envoyAccessLogServiceRemoteService

Address of the service to which access logs from Envoys should be sent. (e.g. accesslog-service:15000). See Access Log Service for details about Envoy’s gRPC Access Log Service API.

No
envoyMetricsServiceRemoteService

Address of the Envoy Metrics Service implementation (e.g. metrics-service:15000). See Metric Service for details about Envoy’s Metrics Service API.

No
zipkinAddressstring

Address of the Zipkin service (e.g. zipkin:9411). DEPRECATED: Use tracing instead.

No

ProxyConfig.InboundInterceptionMode

The mode used to redirect inbound traffic to Envoy. This setting has no effect on outbound traffic: iptables REDIRECT is always used for outbound connections.

NameDescription
REDIRECT

The REDIRECT mode uses iptables REDIRECT to NAT and redirect to Envoy. This mode loses source IP addresses during redirection.

TPROXY

The TPROXY mode uses iptables TPROXY to redirect to Envoy. This mode preserves both the source and destination IP addresses and ports, so that they can be used for advanced filtering and manipulation. This mode also configures the sidecar to run with the CAPNETADMIN capability, which is required to use TPROXY.

RemoteService

FieldTypeDescriptionRequired
addressstring

Address of a remove service used for various purposes (access log receiver, metrics receiver, etc.). Can be IP address or a fully qualified DNS name.

No
tlsSettingsTLSSettings

Use the tls_settings to specify the tls mode to use. If the remote service uses Istio mutual TLS and shares the root CA with Pilot, specify the TLS mode as ISTIO_MUTUAL.

No
tcpKeepaliveTcpKeepalive

If set then set SO_KEEPALIVE on the socket to enable TCP Keepalives.

No

Resource

Resource describes the source of configuration

NameDescription
SERVICE_REGISTRY

Set to only receive service entries that are generated by the platform. These auto generated service entries are combination of services and endpoints that are generated by a specific platform e.g. k8

SDS

SDS defines secret discovery service(SDS) configuration to be used by the proxy. For workload, its values are set in sidecar injector(passed as arguments to istio-proxy container). For pilot/mixer, it’s passed as arguments to istio-proxy container in pilot/mixer deployment yaml files directly.

FieldTypeDescriptionRequired
enabledbool

True if SDS is enabled.

No
k8sSaJwtPathstring

Path of k8s service account JWT path.

No

Tracing

Tracing defines configuration for the tracing performed by Envoy instances.

FieldTypeDescriptionRequired
zipkinZipkin (oneof)

Use a Zipkin tracer.

Yes
lightstepLightstep (oneof)

Use a LightStep tracer.

Yes
datadogDatadog (oneof)

Use a Datadog tracer.

Yes
stackdriverStackdriver (oneof)

Use a Stackdriver tracer.

Yes

Tracing.Datadog

Datadog defines configuration for a Datadog tracer.

FieldTypeDescriptionRequired
addressstring

Address of the Datadog Agent.

No

Tracing.Lightstep

Defines configuration for a LightStep tracer.

FieldTypeDescriptionRequired
addressstring

Address of the LightStep Satellite pool.

No
accessTokenstring

The LightStep access token.

No
securebool

True if a secure connection should be used when communicating with the pool.

No
cacertPathstring

Path to the trusted cacert used to authenticate the pool.

No

Tracing.Stackdriver

Stackdriver defines configuration for a Stackdriver tracer. See Opencensus trace config for details.

FieldTypeDescriptionRequired

Tracing.Zipkin

Zipkin defines configuration for a Zipkin tracer.

FieldTypeDescriptionRequired
addressstring

Address of the Zipkin service (e.g. zipkin:9411).

No