You are viewing a plain text version of this content. The canonical link for it is here.
Posted to cvs@httpd.apache.org by el...@apache.org on 2016/06/18 10:13:42 UTC
svn commit: r1748948 - /httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml
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>