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45 lines
1.5 KiB
Markdown
45 lines
1.5 KiB
Markdown
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# Mongoose-based HTTP load balancer
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## Configuration
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Load balancer is configured with command-line flags.
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### Global flags
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* `-p port` – TCP port to listen on. Default: 8000.
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* `-l log_file` – path to the log file. Default: none.
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* `-s ssl_cert` – path to SSL certificate. Default: none.
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### Backend configuration
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Main flag is `-b uri_prefix host_port` – it adds a new backend for a given
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URI prefix. Example: `-b /stuff/ 127.0.0.1:8080` will route all requests that
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start with '/stuff/' to a backend at port 8080 on localhost. There is a special
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syntax for `uri_prefix` that allows you to change the URIs that get passed to
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backends:
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* `-b /stuff/=/ 127.0.0.1:8080` – for '/stuff/thing' backend will see '/thing'.
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* `-b /stuff/=/other/ 127.0.0.1:8080` – '/stuff/thing' => '/other/thing'.
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Also there are few per-backend flags that can be placed before `-b` and apply
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only to the next backend:
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* `-r` – instead of proxying requests load balancer will reply with 302
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redirect.
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* `-v vhost` – match not only URI prefix but 'Host:' header as well.
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### Example
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```
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load_balancer -s path/to/cert.pem \
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-v example.com -b /site/=/ 127.0.0.1:8080 \
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-b /static/ 127.0.0.1:8081 \
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-b /static/ 127.0.0.1:8082
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```
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In this example requests to 'example.com/site/' will be forwarded to the
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backend on port 8080 with '/site' prefix stripped off and requests to
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'/static/' on any virtual host will be balanced in round-robin fashion between
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backends on ports 8081 and 8082.
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