Linux Dynamic Web site Maintenance Basic Commands Summary _linux

1. Overview
Stateful viewing and monitoring, fault handling, system capacity expansion, data backup/recovery/Site migration

2. Status Viewing and monitoring

(1). System Resource Consumption

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System load and disk I/O
Total number of processes, where the number of httpd process statistics
Number of TCP connections, TIME_WAIT, etc.

(2). Service operation
Users can access

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Tail-f View Apache access logs and error logs

View System Log/var/log/messages
To view the server's connection to the MySQL database

3. Fault Handling

(1). PHP class Dynamic Web site

The service cannot be started, running without responding to user requests ...
A.apache configuration File Error
B. Dynamic module Lib Php5_mod failed to edit correctly
C. Web site root settings are not correct
D. Port conflicts
E. High system load and resource depletion
F.apache configuration parameter is unreasonable
G. Incorrect firewall configuration
H. Database failures
I. System crashes
J. File System corruption
K. Disk partition depletion//usr/var
L.NFS failure
M. load Balancing, Apache listener address is not 127.0.0.1

(2). JSP Type Web site

A. System environment variable set error or not set
B.apache is not consistent with Tomcat's site root settings
Unable to free memory in c.jsp run

4. Problem-handling (case 1)
Apache Virtual Host cannot access resolution
Method: Set Directory Permissions

5. Failure handling process (open forum slow) (case 2)
(1). Uptime--> Top--> system load
(2). VIM/ETC/PASSWD--> View SYSTEM account
(3). iptables-l-N--> View firewall
(4). mysql Client connection database

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Mysql> show Processlist;

(5). View the number of connections to Apache

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PS aux | grep httpd | Grep-v grep | Wc-l

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

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Netstat-an | awk '/^tcp/{+ + s[$NF]} end {to (a in S) print A,s[a]} '

(7). View Port Request 80

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NETSTAT-ANP | Grep-v Unix

(8). Restart Apache

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/usr/local/apache/bin/apachectl restart

(9). To view the number of processes again

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PS aux | grep httpd | Grep-v grep | Wc-l

(10). Modify the maximum number of Apache connections

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<ifmodule prefork.c>
Startservers 10
Minspareservers 10
Maxspareservers 15
Serverlimit 2000
MaxClients 1000
Maxrequestsperchild 10000
</IfModule>
<ifmodule worker.c>
Startservers 3
MaxClients 2000
Serverlimit 25
Minsparethreads 50
Maxsparethreads 200
Threadlimit 200
Threadsperchild 100
Maxrequestsperchild 0
</IfModule>

6.Mysql failure (case 3)

MySQL Client connection database

Copy Code code as follows:

Mysql> show Processlist;