https://bz.apache.org/bugzilla/show_bug.cgi?id=61791
Bug ID: 61791
Summary: make mod_proxy 'honor DNS ttl' with enablereuse on
(dnsttl, addressTTL ?)
Product: Apache httpd-2
Version: 2.5-HEAD
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P2
Component: mod_proxy
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 35541
--> https://bz.apache.org/bugzilla/attachment.cgi?id=35541&action=edit
diff to add dnsttl parameter to ProxyPass
When ProxyPass backend is a hostname and enablereuse is On, the DNS resolution
is done at child startup only.
It may be an issue in environments with auto-scaling, e.g. AWS :
* 'disablereuse on' is not a good solution for perfs.
* MaxConnectionsPerChild is not precise enough to make child restart
Idea is to have parameter 'dnsttl' added to ProxyPass.
If an IP change is detected after a dnsttl : update worker->cp->addr with new
value.
New connections are made to new addr, old stay unchanged ( e.g. for AWS grace
period )
Attached is a very simple patch [*] to summ-up the idea.
[*] patch done on httpd-2.4.29 for very simple testing only (not prod ready!)
Similar has been discussed in mailing lists several times.
Latest seen :
https://lists.apache.org/thread.html/cf2aa9351063ceb90228ef66ce604c85e23124567bb174c92dcc677f@1464388317@%3Cusers.httpd.apache.org%3E
@Yann, maybe your 'addressTTL' patch does answer the need.
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