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ngx_http_upstream_dynamic.md

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Name

  • ngx_http_upstream_dynamic_module

Description

  • This module provides the functionality to resolve domain names into IP addresses in an upstream at run-time.

Examples

upstream backend {
    dynamic_resolve fallback=stale fail_timeout=30s;

    server a.com;
    server b.com;
}

server {
    ...

    proxy_pass http://backend;
}

Directives

dynamic_resolve

Syntax: dynamic_resolve [fallback=stale|next|shutdown] [fail_timeout=time]

Default: -

Context: upstream

Enable dynamic DNS resolving functionality in an upstream.

The 'fallback' parameter specifies what action to take if a domain name can not be resolved into an IP address:

  • stale, use the original IP addresses resolved when tengine starts.
  • next, go to next availiable server in the upstream.
  • shutdown, finalize current request.

The 'fail_timeout' parameter specifies how long time tengine considers the DNS server as unavailiable if a DNS query fails for a server in the upstream. In this period of time, all requests comming will follow what 'fallback' specifies.