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Merge pull request #534 from infosiftr/haproxy-reload 

Document haproxy SIGHUP reloading
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Tianon Gravi 2016-03-29 10:33:14 -07:00
parent 4e0375fea2 17d9cd880a
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@ -46,3 +46,13 @@ $ docker run -d --name my-running-haproxy my-haproxy
```console ```console
$ docker run -d --name my-running-haproxy -v /path/to/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro haproxy:1.5 $ docker run -d --name my-running-haproxy -v /path/to/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro haproxy:1.5
``` ```
### Reloading config
If you used a bind mount for the config and have edited your `haproxy.cfg` file, you can use haproxy's graceful reload feature by sending a `SIGHUP` to the container:
```console
$ docker kill -s HUP my-running-haproxy
```
The entrypoint script in the image checks for running the command `haproxy` and replaces it with `haproxy-systemd-wrapper` from haproxy upstream which takes care of signal handling to do the graceful reload. Under the hood this uses the `-sf` option of haproxy so "there are two small windows of a few milliseconds each where it is possible that a few connection failures will be noticed during high loads" (see [Stopping and restarting HAProxy](http://www.haproxy.org/download/1.6/doc/management.txt)).