consul/website/content/docs/connect/config-entries/service-splitter.mdx

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---
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layout: docs
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page_title: 'Configuration Entry Kind: Service Splitter'
sidebar_title: Service Splitter
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description: >-
The service-splitter config entry kind controls how to split incoming Connect
requests across different subsets of a single service (like during staged
canary rollouts), or perhaps across different services (like during a v2
rewrite or other type of codebase migration).
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---
# Service Splitter
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-> **v1.8.4+:** On Kubernetes, the `ServiceSplitter` custom resource is supported in Consul versions 1.8.4+.<br />
**v1.6.0+:** On other platforms, this config entry is supported in Consul versions 1.6.0+.
The `service-splitter` config entry kind (`ServiceSplitter` on Kubernetes) controls how to split incoming Connect
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requests across different subsets of a single service (like during staged
canary rollouts), or perhaps across different services (like during a v2
rewrite or other type of codebase migration).
If no splitter config is defined for a service it is assumed 100% of traffic
flows to a service with the same name and discovery continues on to the
resolution stage.
## Interaction with other Config Entries
- Service splitter config entries are a component of [L7 Traffic
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Management](/docs/connect/l7-traffic-management).
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- Service splitter config entries are restricted to only services that define
their protocol as http-based via a corresponding
[`service-defaults`](/docs/connect/config-entries/service-defaults) config
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entry or globally via
[`proxy-defaults`](/docs/connect/config-entries/proxy-defaults) .
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- Any split destination that specifies a different `Service` field and omits
the `ServiceSubset` field is eligible for further splitting should a splitter
be configured for that other service, otherwise resolution proceeds according
to any configured
[`service-resolver`](/docs/connect/config-entries/service-resolver).
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## Sample Config Entries
### Two subsets of same service
<Tabs>
<Tab heading="HCL">
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Split traffic between two subsets of the same service:
```hcl
Kind = "service-splitter"
Name = "web"
Splits = [
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{
Weight = 90
ServiceSubset = "v1"
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},
{
Weight = 10
ServiceSubset = "v2"
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},
]
```
</Tab>
<Tab heading="Kubernetes YAML">
Split traffic between two subsets of the same service:
```yaml
apiVersion: consul.hashicorp.com/v1alpha1
kind: ServiceSplitter
metadata:
name: web
spec:
splits:
- weight: 90
serviceSubset: v1
- weight: 10
serviceSubset: v2
```
</Tab>
</Tabs>
### Two different services
<Tabs>
<Tab heading="HCL">
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Split traffic between two services:
```hcl
Kind = "service-splitter"
Name = "web"
Splits = [
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{
Weight = 50
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# will default to service with same name as config entry ("web")
},
{
Weight = 10
Service = "web-rewrite"
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},
]
```
</Tab>
<Tab heading="Kubernetes YAML">
Split traffic between two services:
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```yaml
apiVersion: consul.hashicorp.com/v1alpha1
kind: ServiceSplitter
metadata:
name: web
spec:
splits:
- weight: 50
# will default to service with same name as config entry ("web")
- weight: 10
service: web-rewrite
```
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</Tab>
</Tabs>
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## Available Fields
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<ConfigEntryReference
keys={[
{
name: 'apiVersion',
description: 'Must be set to `consul.hashicorp.com/v1alpha1`',
hcl: false,
},
{
name: 'Kind',
description: {
hcl: 'Must be set to `service-splitter`',
yaml: 'Must be set to `ServiceSplitter`',
},
},
{
name: 'Name',
description: 'Set to the name of the service being configured.',
type: 'string: <required>',
yaml: false,
},
{
name: 'Namespace',
type: `string: "default"`,
enterprise: true,
description: 'Specifies the namespace the config entry will apply to.',
yaml: false,
},
{
name: 'Meta',
type: 'map<string|string>: nil',
description:
'Specifies arbitrary KV metadata pairs. Added in Consul 1.8.4.',
yaml: false,
},
{
name: 'metadata',
children: [
{
name: 'name',
description: 'Set to the name of the service being configured.',
},
{
name: 'namespace',
description:
'If running Consul Open Source, the namespace is ignored (see [Kubernetes Namespaces in Consul OSS](/docs/k8s/crds#consul-oss)). If running Consul Enterprise see [Kubernetes Namespaces in Consul Enterprise](/docs/k8s/crds#consul-enterprise) for more details.',
},
],
hcl: false,
},
{
name: 'Splits',
type: 'array<ServiceSplit>',
description:
'Defines how much traffic to send to which set of service instances during a traffic split. The sum of weights across all splits must add up to 100.',
children: [
{
name: 'weight',
type: 'float32: 0',
description:
'A value between 0 and 100 reflecting what portion of traffic should be directed to this split. The smallest representable eight is 1/10000 or .01%',
},
{
name: 'Service',
type: 'string: ""',
description: 'The service to resolve instead of the default.',
},
{
name: 'ServiceSubset',
type: 'string: ""',
description: {
hcl:
"A named subset of the given service to resolve instead of one defined as that service's `DefaultSubset`. If empty the default subset is used.",
yaml:
"A named subset of the given service to resolve instead of one defined as that service's `defaultSubset`. If empty the default subset is used.",
},
},
{
name: 'Namespace',
enterprise: true,
type: 'string: ""',
description:
'The namespace to resolve the service from instead of the current namespace. If empty the current namespace is assumed.',
},
],
},
]}
/>
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## ACLs
Configuration entries may be protected by [ACLs](/docs/security/acl).
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Reading a `service-splitter` config entry requires `service:read` on the resource.
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Creating, updating, or deleting a `service-splitter` config entry requires
`service:write` on the resource and `service:read` on any other service referenced by
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name in these fields:
- [`Splits[].Service`](#service)