mirror of
https://github.com/traefik/traefik.git
synced 2025-11-04 02:11:15 +01:00
81 lines
2.3 KiB
Markdown
81 lines
2.3 KiB
Markdown
---
|
|
title: "Traefik HTTP Retry Documentation"
|
|
description: "Configure Traefik Proxy's HTTP Retry middleware, so you can retry requests to a backend server until it succeeds. Read the technical documentation."
|
|
---
|
|
|
|
# Retry
|
|
|
|
Retrying until it Succeeds
|
|
{: .subtitle }
|
|
|
|
<!--
|
|
TODO: add schema
|
|
-->
|
|
|
|
The Retry middleware reissues requests a given number of times when it cannot contact the backend service.
|
|
This applies at the transport level (TCP).
|
|
If the service does not respond to the initial connection attempt, the middleware retries.
|
|
However, once the service responds, regardless of the HTTP status code, the middleware considers it operational and stops retrying.
|
|
This means that the retry mechanism does not handle HTTP errors; it only retries when there is no response at the TCP level.
|
|
The Retry middleware has an optional configuration to enable an exponential backoff.
|
|
|
|
## Configuration Examples
|
|
|
|
```yaml tab="Docker & Swarm"
|
|
# Retry 4 times with exponential backoff
|
|
labels:
|
|
- "traefik.http.middlewares.test-retry.retry.attempts=4"
|
|
- "traefik.http.middlewares.test-retry.retry.initialinterval=100ms"
|
|
```
|
|
|
|
```yaml tab="Kubernetes"
|
|
# Retry 4 times with exponential backoff
|
|
apiVersion: traefik.io/v1alpha1
|
|
kind: Middleware
|
|
metadata:
|
|
name: test-retry
|
|
spec:
|
|
retry:
|
|
attempts: 4
|
|
initialInterval: 100ms
|
|
```
|
|
|
|
```yaml tab="Consul Catalog"
|
|
# Retry 4 times with exponential backoff
|
|
- "traefik.http.middlewares.test-retry.retry.attempts=4"
|
|
- "traefik.http.middlewares.test-retry.retry.initialinterval=100ms"
|
|
```
|
|
|
|
```yaml tab="File (YAML)"
|
|
# Retry 4 times with exponential backoff
|
|
http:
|
|
middlewares:
|
|
test-retry:
|
|
retry:
|
|
attempts: 4
|
|
initialInterval: 100ms
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
# Retry 4 times with exponential backoff
|
|
[http.middlewares]
|
|
[http.middlewares.test-retry.retry]
|
|
attempts = 4
|
|
initialInterval = "100ms"
|
|
```
|
|
|
|
## Configuration Options
|
|
|
|
### `attempts`
|
|
|
|
_mandatory_
|
|
|
|
The `attempts` option defines how many times the request should be retried.
|
|
|
|
### `initialInterval`
|
|
|
|
The `initialInterval` option defines the first wait time in the exponential backoff series. The maximum interval is
|
|
calculated as twice the `initialInterval`. If unspecified, requests will be retried immediately.
|
|
|
|
The value of initialInterval should be provided in seconds or as a valid duration format, see [time.ParseDuration](https://golang.org/pkg/time/#ParseDuration).
|