mirror of https://github.com/hashicorp/consul
109 lines
3.5 KiB
Markdown
109 lines
3.5 KiB
Markdown
---
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layout: "docs"
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page_title: "Configuration Entry Kind: Service Splitter (beta)"
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sidebar_current: "docs-agent-cfg_entries-service_splitter"
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description: |-
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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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---
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# Service Splitter <sup>(beta)</sup>
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The `service-splitter` config entry kind controls how to split incoming Connect
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requests across different subsets of a single service (like during staged
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canary rollouts), or perhaps across different services (like during a v2
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rewrite or other type of codebase migration).
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If no splitter config is defined for a service it is assumed 100% of traffic
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flows to a service with the same name and discovery continues on to the
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resolution stage.
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## Interaction with other Config Entries
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- Service splitter config entries are a component of [L7 Traffic
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Management](/docs/connect/l7-traffic-management.html).
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- Service splitter config entries are restricted to only services that define
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their protocol as http-based via a corresponding
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[`service-defaults`](/docs/agent/config-entries/service-defaults.html) config
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entry or globally via
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[`proxy-defaults`](/docs/agent/config-entries/proxy-defaults.html) .
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- Any split destination that specifies a different `Service` field and omits
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the `ServiceSubset` field is eligible for further splitting should a splitter
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be configured for that other service, otherwise resolution proceeds according
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to any configured
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[`service-resolver`](/docs/agent/config-entries/service-resolver.html).
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## Sample Config Entries
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Split traffic between two subsets of the same service:
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```hcl
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kind = "service-splitter"
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name = "web"
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splits = [
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{
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weight = 90
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service_subset = "v1"
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},
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{
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weight = 10
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service_subset = "v2"
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},
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]
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```
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Split traffic between two services:
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```hcl
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kind = "service-splitter"
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name = "web"
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splits = [
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{
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weight = 50
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# will default to service with same name as config entry ("web")
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},
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{
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weight = 10
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service = "web-rewrite"
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},
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]
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```
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## Available Fields
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- `Kind` - Must be set to `service-splitter`
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- `Name` `(string: <required>)` - Set to the name of the service being configured.
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- `Splits` `(array<ServiceSplit>)` - Defines how much traffic to send to which
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set of service instances during a traffic split. The sum of weights across
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all splits must add up to 100.
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- `Weight` `(float32: 0)` - A value between 0 and 100 reflecting what portion
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of traffic should be directed to this split. The smallest representable
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weight is 1/10000 or .01%
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- `Service` `(string: "")` - The service to resolve instead of the default.
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- `ServiceSubset` `(string: "")` - A named subset of the given service to
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resolve instead of one defined as that service's `DefaultSubset`. If empty
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the default subset is used.
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- `Namespace` `(string: "")` - The namespace to resolve the service from
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instead of the current namespace. If empty the current namespace is
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assumed.
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## ACLs
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Configuration entries may be protected by
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[ACLs](https://learn.hashicorp.com/consul/security-networking/production-acls).
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Reading a `service-splitter` config entry requires `service:read` on itself.
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Creating, updating, or deleting a `service-splitter` config entry requires
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`service:write` on itself and `service:read` on any other service referenced by
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name in these fields:
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- [`Splits[].Service`](#service)
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