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| author | André Malo <nd@apache.org> | 2017-05-06 19:06:28 +0200 |
|---|---|---|
| committer | André Malo <nd@apache.org> | 2017-05-06 19:06:28 +0200 |
| commit | 08a050a14a6d592501d6596e273f26e08775d3de (patch) | |
| tree | 66e20cb4a369e44a9917c9782e644a547dd111bf /docs/manual/mod/mpm_common.html.en | |
| parent | property fixes (diff) | |
| download | apache2-08a050a14a6d592501d6596e273f26e08775d3de.tar.xz apache2-08a050a14a6d592501d6596e273f26e08775d3de.zip | |
update transformation
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1794163 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'docs/manual/mod/mpm_common.html.en')
| -rw-r--r-- | docs/manual/mod/mpm_common.html.en | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/docs/manual/mod/mpm_common.html.en b/docs/manual/mod/mpm_common.html.en index 0d2756bf49..b56633e9b3 100644 --- a/docs/manual/mod/mpm_common.html.en +++ b/docs/manual/mod/mpm_common.html.en @@ -304,6 +304,27 @@ in *BSDs.</td></tr> The number of children processes needs to be a multiple of the number of buckets to optimally accept connections.</p> + <div class="note"> + <h3>Multiple <code class="directive">Listen</code>ers or Apache HTTP servers on + the same IP address and port</h3> + <p>Setting the <code>SO_REUSEPORT</code> option on the listening socket(s) + consequently allows multiple processes (sharing the same <code>EUID</code>, + e.g. <code>root</code>) to bind to the the same IP address and port, + without the binding error raised by the system in the usual case.</p> + <p>This also means that multiple instances of Apache httpd configured on a + same <code>IP:port</code> and with a positive <code class="directive">ListenCoresBucketsRatio</code> + would start without an error too, and then run with incoming connections + evenly distributed accross both instances (this is NOT a recommendation or + a sensible usage in any case, but just a notice that it would prevent such + possible issues to be detected).</p> + <p>Within the same instance, Apache httpd will check and fail to start if + multiple <code class="directive">Listen</code> directives on the exact same IP (or + hostname) and port are configured, thus avoiding the creation of some + duplicated buckets which would be useless and kill performances. However + it can't (and won't try harder to) catch all the possible overlapping cases + (like a hostname resolving to an IP used elsewhere).</p> + </div> + </div> <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="directive-section"><h2><a name="MaxConnectionsPerChild" id="MaxConnectionsPerChild">MaxConnectionsPerChild</a> <a name="maxconnectionsperchild" id="maxconnectionsperchild">Directive</a></h2> |