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networking: add connection backoff config options #2590

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4 changes: 3 additions & 1 deletion administration/networking.md
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,7 @@ The following table describes the network configuration properties available and
|:--------------------------------|:-------------------------------------------------------------------------------------------------------------------|:--------|
| `net.connect_timeout` | Set maximum time allowed to establish a connection, this time includes the TLS handshake. | `10s` |
| `net.connect_timeout_log_error` | On connection timeout, specify if it should log an error. When disabled, the timeout is logged as a debug message. | `true` |
| `net.initial_backoff` | Backoff period in seconds after the first connection failure. | `0` |
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| `net.io_timeout` | Set maximum time a connection can stay idle while assigned. | `0s` |
| `net.keepalive` | Enable or disable connection keepalive support. | `true` |
| `net.keepalive_idle_timeout` | Set maximum time expressed in seconds for an idle keepalive connection. | `30s` |
Expand All @@ -68,6 +69,7 @@ The following table describes the network configuration properties available and
| `net.dns.prefer_ipv6` | Prioritize IPv6 DNS results when trying to establish a connection. | `false` |
| `net.dns.resolver` | Select the primary DNS resolver type (`LEGACY` or `ASYNC`). | _none_ |
| `net.keepalive_max_recycle` | Set maximum number of times a keepalive connection can be used before it's retired. | `2000` |
| `net.max_backoff` | Maximum connection backoff period in seconds. | `0` |
| `net.max_worker_connections` | Set maximum number of TCP connections that can be established per worker. | `0` |
| `net.proxy_env_ignore` | Ignore the environment variables `HTTP_PROXY`, `HTTPS_PROXY` and `NO_PROXY` when set. | `false` |
| `net.tcp_keepalive` | Enable or disable Keepalive support. | `off` |
Expand Down Expand Up @@ -155,7 +157,7 @@ $ nc -l 9090
{"date":1587769735.572419,"rand_value":17086151440182975160}
{"date":1587769736.572277,"rand_value":527581343064950185}
```

If the `net.keepalive` option isn't enabled, Fluent Bit closes the TCP connection and netcat quits.

After the five records arrive, the connection idles. After 10 seconds, the connection closes due to `net.keepalive_idle_timeout`.