什么是日志来检查挂起的LAMP服务器？

我正在运行Centos 5.7。 我在一个典型的Web托pipe服务器设置中运行Apache，MySQL，PHP，Courier-IMAP，Qmail和Plesk控制面板。 它经常被挂起。

我不得不通过pipe理面板重新启动服务器，因为没有Plesk或SSH访问…如何防止这种情况再次发生？

处理器：AMD Phenom（tm）II X4
内存：8 GB

我注意到了Apache日志中的一些错误：

• 安装成功后，我无法访问Ubuntu上的phpMyAdmin
• lighttpd：为什么使用端口> = 9000不能正常工作
• 安装Zend CE服务器后，phpmyadmin会抛出一个空白页面
• EC2多个网站在一个实例，负载平衡
• 仅当文件不存在时才符号链接

# tail -20 /var/log/httpd/error_log [Mon Sep 03 06:12:33 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/web [Mon Sep 03 06:12:34 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/php-my-admin [Mon Sep 03 06:12:34 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/websql [Mon Sep 03 06:12:35 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpmyadmin [Mon Sep 03 06:12:36 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin [Mon Sep 03 06:12:36 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2 [Mon Sep 03 06:12:37 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/php-my-admin [Mon Sep 03 06:12:38 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.2.3 [Mon Sep 03 06:12:38 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.2.6 [Mon Sep 03 06:12:39 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.5.1 [Mon Sep 03 06:12:39 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.5.4 [Mon Sep 03 06:12:40 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.5.5-rc1 [Mon Sep 03 06:12:41 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.5.5-rc2 [Mon Sep 03 06:12:41 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.5.5 [Mon Sep 03 06:12:42 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.5.5-pl1 [Mon Sep 03 06:12:43 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.5.6-rc1 [Mon Sep 03 06:12:43 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.5.6-rc2 [Mon Sep 03 06:12:44 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.5.6 [Mon Sep 03 06:12:45 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.5.7 [Mon Sep 03 06:12:45 2012] [error] [client 202.29.34.28] File does not exist: /var/www/vhosts/default/htdocs/phpMyAdmin-2.5.7-pl1 

还注意到一些mysql缓慢的查询：

 # Query_time: 23.734215 Lock_time: 0.000111 Rows_sent: 1 Rows_examined: 2501281 use yasooyam_yasoodb; SET timestamp=1346149823; SELECT COUNT(user_history_product.ID) FROM user_history_product WHERE user_history_product.PRODUCT_ID=915; # Query_time: 293.916966 Lock_time: 1.163037 Rows_sent: 1 Rows_examined: 2501280 SET timestamp=1346149823; SELECT COUNT(user_history_product.ID) FROM user_history_product WHERE user_history_product.PRODUCT_ID=172; # Query_time: 61.295134 Lock_time: 0.000345 Rows_sent: 331 Rows_examined: 331 use pumexinf_mdb; SET timestamp=1346149825; show tables; # Query_time: 16.869923 Lock_time: 2.281526 Rows_sent: 1889 Rows_examined: 9330 use yasooyam_yasoodb; SET timestamp=1346586973; SELECT user_items.ID, user_items.TYPE, user_items.USER_ID, user_items.SHOW_IN, user_items.CATEGORY, user_items.SUB_CATEGORY, user_items.COUNTRY, user_items.LANGUAGE, user_items.TITLE, user_items.START_TIME, user_items.END_TIME, user_items.DATE, user_items.DESCRIPTION, user_items.ATTACH, user_items.IMAGE, user_items.IMAGE_AUTHOR, user_items.IMAGE_SOURCE, user_items.VIDEO_URL, user_items.THUMB, user_items.AUTHOR, user_items.SOURCE, user_items.CREATE_DATE, user_items.UPDATE_DATE, user_items.STATUS FROM user_items WHERE user_items.TYPE=9 AND user_items.STATUS=1;