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apache:architecture [2014/05/24 20:37] – [optimize load module apache] adminapache:architecture [2016/01/27 04:58] – [optimize load module apache] admin
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 MPM(Multi Processing Module) MPM(Multi Processing Module)
 ===== MPM Prefork Architecture ===== ===== MPM Prefork Architecture =====
 +Basic configuration:
   * StartServers: number of server processes to start   * StartServers: number of server processes to start
   * MinSpareServers: minimum number of server processes which are kept spare   * 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|}} {{: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 ===== ===== MPM worker Architecture =====
   * StartServers: initial number of server processes to start   * StartServers: initial number of server processes to start
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 apache    5360  0.1  7.6 283964 38312 ?   S    15:59   0:00 /usr/sbin/httpd 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) </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 pmap -x 6812 | sort -nk +2
 00007fcacac95000    2048       0       0 -----  mod_mime_magic.so 00007fcacac95000    2048       0       0 -----  mod_mime_magic.so
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 ===== Optimize apache and PHP config ===== ===== Optimize apache and PHP config =====
 ==== optimize load module apache ==== ==== 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> <code bash>
 LoadModule authz_host_module modules/mod_authz_host.so#Order 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 log_config_module modules/mod_log_config.so#LogFormat,TransferLog
 LoadModule expires_module modules/mod_expires.so LoadModule expires_module modules/mod_expires.so
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 </code> </code>
 ==== optimize load module php ==== ==== 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>
 +
apache/architecture.txt · Last modified: 2022/10/29 16:15 by 127.0.0.1