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From elu...@apache.org
Subject svn commit: r1748948 - /httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml
Date Sat, 18 Jun 2016 10:13:42 GMT
Author: elukey
Date: Sat Jun 18 10:13:42 2016
New Revision: 1748948

URL: http://svn.apache.org/viewvc?rev=1748948&view=rev
Log:
Follow up about DNS Resolution cache in mod-proxy after 
a users@ email thread ("mod_proxy and DNS resolving").
Review from devs would be really appreciated, I'd like to 
backport this info asap to 2.4.x.

 

Modified:
    httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml

Modified: httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml
URL: http://svn.apache.org/viewvc/httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml?rev=1748948&r1=1748947&r2=1748948&view=diff
==============================================================================
--- httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml (original)
+++ httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml Sat Jun 18 10:13:42 2016
@@ -304,13 +304,14 @@ ProxyPass "/examples" "http://backend.ex
       <directive module="mod_proxy">BalancerMember</directive>.</p>
 
       <note><title>DNS resolution for origin domains</title>
-      <p>The DNS domain resolution happens when the socket to
-        the origin server is created for the first time.
-        When connection pooling is used, the DNS resolution is performed
-        again only when the <code>ttl</code> of the connection expires
-        (please check <directive module="mod_proxy">ProxyPass</directive>
-        parameters).
-        This means that httpd does not perform any DNS resolution caching.
+      <p>DNS resolution happens when the socket to
+        the origin domain is created for the first time.
+        When connection pooling is used, each backend domain is resolved 
+        only once per child process, and reused for all further connections 
+        until the child is recycled. This information should to be considered 
+        while planning DNS maintenance tasks involving backend domains. 
+        Please also check <directive module="mod_proxy">ProxyPass</directive>
+        parameters for more details about connection reuse.
         </p>
       </note>
 



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