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--- apache:architecture [2014/09/20 14:27] – [MPM Prefork Architecture] admin
+++ apache:architecture [2022/10/29 16:15] (current) – external edit 127.0.0.1
@@ Line 7: / Line 7: @@
   * MinSpareServers: minimum 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
+  * 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          2
+    StartServers          6
-    MinSpareServers       2
+    MinSpareServers       6
-    MaxSpareServers      5
+    MaxSpareServers      12
-    MaxClients          10
+    MaxClients          12
     MaxRequestsPerChild   0
-</IfModule>
+</IfModule></code>
-</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 154: / Line 183: @@
 apache    5360  0.1  7.6 283964 38312 ?   S    15:59   0:00 /usr/sbin/httpd
 </code>With VSZ is Virtual Memory Size(address space allocated) , and RSS is Resident Set Size (physically resident memory)
-  * pmap -x 6726 | sort -ak +2<code bash>
+  * pmap -x 6726 | sort -nk +2<code bash>
 pmap -x 6812 | sort -nk +2
 fcacac95000    2048       0       0 -----  mod_mime_magic.so
@@ Line 169: / Line 198: @@
 ===== Optimize apache and PHP config =====
 ==== optimize load module apache ====
-Config load modules below:
+Config Optimize load modules for httpd with Explain directives with these modules:
-<code bash>
-LoadModule authz_host_module modules/mod_authz_host.so
-LoadModule log_config_module modules/mod_log_config.so
-LoadModule expires_module modules/mod_expires.so
-LoadModule deflate_module modules/mod_deflate.so
-LoadModule headers_module modules/mod_headers.so
-LoadModule env_module modules/mod_env.so
-LoadModule setenvif_module modules/mod_setenvif.so
-LoadModule mime_module modules/mod_mime.so
-LoadModule autoindex_module modules/mod_autoindex.so
-LoadModule negotiation_module modules/mod_negotiation.so
-LoadModule dir_module modules/mod_dir.so
-LoadModule alias_module modules/mod_alias.so
-LoadModule rewrite_module modules/mod_rewrite.so
-</code>
-Explain directives with these modules:
 <code bash>
 LoadModule authz_host_module modules/mod_authz_host.so#Order
+LoadModule access_compat_module modules/mod_access_compat.so#Require
 LoadModule log_config_module modules/mod_log_config.so#LogFormat,TransferLog
 LoadModule expires_module modules/mod_expires.so
@@ Line 203: / Line 216: @@
 </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>