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documentation: add tail_proxy_url option to query_frontend_config section #2879

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Nov 5, 2020
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documentation: add tail_proxy_url option to query_frontend_config section #2879

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4ed4a2e
add tail_proxy_url option to the query_frontend_config section of con…
zhanghjster Nov 5, 2020
064abc0
If queryFrontend run in tail proxy mode, append the Host of the tail_…
zhanghjster Nov 5, 2020
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4 changes: 4 additions & 0 deletions docs/sources/configuration/_index.md
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Original file line number Diff line number Diff line change
Expand Up @@ -296,6 +296,10 @@ The query_frontend_config configures the Loki query-frontend.
# Set to < 0 to enable on all queries.
# CLI flag: -frontend.log-queries-longer-than
[log_queries_longer_than: <duration> | default = 0s]

# URL of querier for tail proxy.
# CLI flag: -frontend.tail-proxy-url
[tail_proxy_url: <string> | default = ""]
```

## queryrange_config
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7 changes: 7 additions & 0 deletions pkg/loki/modules.go
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Expand Up @@ -383,6 +383,13 @@ func (t *Loki) initQueryFrontend() (_ services.Service, err error) {
return nil, err
}
tp := httputil.NewSingleHostReverseProxy(tailURL)

director := tp.Director
tp.Director = func(req *http.Request) {
director(req)
req.Host = tailURL.Host
}

defaultHandler = httpMiddleware.Wrap(tp)
} else {
defaultHandler = frontendHandler
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