Dynamic Site Maintenance Basic commands

1. Overview

Status View and monitoring, fault handling, system capacity expansion, data backup/recovery/Site migration

2. Status View and monitoring

(1). System Resource Consumption

123	系统负载和磁盘I/O进程的总数，其中httpd进程数统计TCP连接数，TIME_WAIT 等

(2). Operation of the servicecan users access

1	tail-f 查看apache访问日志与错误日志

View System Log/var/log/messages

View the server's connection to the MySQL database

3. Fault Handling

(1). PHP class Dynamic Web site

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服务不能启动、运行中不响应用户请求……a.apache 配置文件错误b.动态模块lib PHP5_mod 未能正确编辑c.网站根目录设置不正确d.端口冲突e.系统负载过高，资源耗尽f.Apache 配置参数不合理g.防火墙配置不正确h.数据库故障i.系统崩溃j.文件系统损坏k.磁盘分区耗尽 / /usr/varl.NFS失效m.负载均衡下，Apache监听地址不是127.0.0.1

(2). JSP Type Web site

123	a.系统环境变量设置错误或没设置b.Apache与Tomcat的网站根目录设置不一致c.JSP 运行中一直不能释放内存

4. Problem handling (case 1)Apache Virtual Host does not have access to resolve

Method: Set Directory Permissions

5. Troubleshooting process (slow opening of Forum) (case 2)(1). Uptime--top-to-system load(2). VIM/ETC/PASSWD--View System account(3). Iptables-l----View firewall(4). mysql Client connection database

1	mysql> show processlist;

(5). View the number of Apache connections

1	psaux | grep httpd | grep -v grep | wc-l

(6). View the number of connections to TCP and summarize

1	netstat-an | awk‘/^tcp/ {++ S[$NF]} END {for (a in S) print a,S[a]}‘

(7). View Port Requests

1	netstat-anp | grep -vunix

(8). Restart Apache

1	/usr/local/apache/bin/apachectlrestart

(9). Re-view the number of processes

1	psaux | grep httpd | grep -v grep | wc-l

(10). Modify the maximum number of Apache connections

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<IfModule prefork.c>StartServers 10MinSpareServers 10MaxSpareServers 15ServerLimit 2000MaxClients 1000MaxRequestsPerChild 10000</IfModule><IfModule worker.c>StartServers 3MaxClients 2000ServerLimit 25MinSpareThreads 50MaxSpareThreads 200ThreadLimit 200ThreadsPerChild 100MaxRequestsPerChild 0</IfModule>

6.Mysql Fault (case 3)

12	mysql 客户端连接数据库mysql> show processlist;

Dynamic Site Maintenance Basic commands