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--- apache:architecture [2014/05/24 20:37] – [optimize load module apache] admin
+++ apache:architecture [2015/06/25 05:32] – [Config disable warning log from browser] admin
@@ Line 3: / Line 3: @@
 MPM(Multi Processing Module)
 ===== MPM Prefork Architecture =====
+Basic configuration:
   * StartServers: number of server processes to start
   * MinSpareServers: minimum number of server processes which are kept spare
-  * MaxSpareServers: maximum number of server processes which are kept spare
+  * MaxSpareServers: maximum **number of server processes which are kept spare**
+  * MaxClients:  maximum number of server processes allowed to start => Limist number of httpd created and processing the request. For example: MaxClients 10, And clients send **100 concurrency requests to server**, The server only **create max 10 server process httpd** for processing, and **99 remain requests will waiting in the queues**
 {{:apache:preforkmodel.png|}}
+Config example:<code>
+<IfModule mpm_prefork_module>
+    StartServers          6
+    MinSpareServers       6
+    MaxSpareServers      12
+    MaxClients          12
+    MaxRequestsPerChild   0
+</IfModule></code>
+check config:
+  * check number of httpd process with none client request:<code bash>
+ps -eaf | grep httpd
+</code>output:<code>
+root      1629     1  0 20:56 ?        00:00:00 /usr/local/apache/bin/httpd
+apache    1631  1629  0 20:56 ?        00:00:00 /usr/local/apache/bin/httpd
+apache    1632  1629  0 20:56 ?        00:00:00 /usr/local/apache/bin/httpd
+apache    1633  1629  0 20:56 ?        00:00:00 /usr/local/apache/bin/httpd
+apache    1634  1629  0 20:56 ?        00:00:00 /usr/local/apache/bin/httpd
+apache    1635  1629  0 20:56 ?        00:00:00 /usr/local/apache/bin/httpd
+apache    1636  1629  0 20:56 ?        00:00:00 /usr/local/apache/bin/httpd
+</code> => 7 processes = MinSpareServers + 1
+  * run load test with 20 concurrecy requests to server:<code bash>
+ab -n 200 -c 20 http://shop.babies.vn/
+</code> And check number of httpd processes:<code>
+ps -eaf | grep httpd
+root      1013     1  0 19:50 ?        00:00:00 /usr/local/apache/bin/httpd
+apache    1144  1013  0 20:10 ?        00:00:09 /usr/local/apache/bin/httpd
+apache    1210  1013  1 20:29 ?        00:00:05 /usr/local/apache/bin/httpd
+apache    1216  1013  2 20:30 ?        00:00:05 /usr/local/apache/bin/httpd
+apache    1219  1013  2 20:30 ?        00:00:06 /usr/local/apache/bin/httpd
+apache    1220  1013  2 20:30 ?        00:00:05 /usr/local/apache/bin/httpd
+apache    1226  1013  8 20:33 ?        00:00:06 /usr/local/apache/bin/httpd
+apache    1227  1013  8 20:33 ?        00:00:06 /usr/local/apache/bin/httpd
+apache    1228  1013  8 20:33 ?        00:00:06 /usr/local/apache/bin/httpd
+apache    1229  1013  7 20:33 ?        00:00:05 /usr/local/apache/bin/httpd
+apache    1230  1013  6 20:33 ?        00:00:04 /usr/local/apache/bin/httpd
+apache    1231  1013  8 20:33 ?        00:00:05 /usr/local/apache/bin/httpd
+apache    1288  1013  8 20:34 ?        00:00:03 /usr/local/apache/bin/httpd
+</code> => max httpd processes = 13 = maxClients + 1
 ===== MPM worker Architecture =====
   * StartServers: initial number of server processes to start
@@ Line 192: / Line 232: @@
 </code>
 ==== optimize load module php ====
+===== Custom Config for Apache =====
+==== Config disable warning log from browser ====
+With this config, the log will display in PHP error log but they don't display in browser side\\\
+Update httpd.conf
+<code php>
+<IfModule mod_php5.c>
+    php_admin_flag display_errors off
+</IfModule>
+</code>