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middleware/proxy: async health checks (#749)

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* Switches out Unhealthy bool for OkUntil timestamp

* Make sure servers are healthy forever if there are no health checks

* Moves health check off into a go routine to avoid blocking conditions

* Improved logging info

* Fixes initial date

* Fixes health checking; alters tests to adapt to async health checking

* Moves future variable into static upstream and populates it in more places

* Restores silencing of stdout during testing

* Restores silencing of stdout during testing

* keeps check url string once built

* Removes debug message

* uses zero value to signal no checking; reduces in-mutex code to a fetch
This commit is contained in:
ghostflame
2017-06-30 10:13:45 +01:00
committed by Miek Gieben
parent edf71fb168
commit bb05a665eb
9 changed files with 158 additions and 60 deletions
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6
middleware/proxy/README.md
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@@ -41,9 +41,9 @@ proxy FROM TO... {
* `max_fails` is the number of failures within fail_timeout that are needed before considering
a backend to be down. If 0, the backend will never be marked as down. Default is 1.
* `health_check` will check path (on port) on each backend. If a backend returns a status code of
200-399, then that backend is healthy. If it doesn't, the backend is marked as unhealthy for
duration and no requests are routed to it. If this option is not provided then health checks are
disabled. The default duration is 30 seconds ("30s").
200-399, then that backend is marked healthy for double the healthcheck duration. If it doesn't,
it is marked as unhealthy and no requests are routed to it. If this option is not provided then
health checks are disabled. The default duration is 30 seconds ("30s").
* **IGNORED_NAMES** in `except` is a space-separated list of domains to exclude from proxying.
Requests that match none of these names will be passed through.
* `spray` when all backends are unhealthy, randomly pick one to send the traffic to. (This is