Httpd服务入门知识-Httpd服务常见配置案例之配置持久连接

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Httpd服务入门知识-Httpd服务常见配置案例之配置持久连接

作者：尹正杰

一.查看默认的持久连接时间

[root@node101.yinzhengjie.org.cn ~]# egrep -v "^ *#|^$" /etc/httpd/conf/httpd.conf
ServerRoot "/etc/httpd"
Listen
Include conf.modules.d/*.conf
User apache
Group apache
ServerAdmin root@localhost
<Directory />
AllowOverride none
Require all denied
</Directory>
DocumentRoot "/var/www/html"
<Directory "/var/www">
AllowOverride None
Require all granted
</Directory>
<Directory "/var/www/html">
Options Indexes FollowSymLinks
AllowOverride None
Require all granted
</Directory>
<IfModule dir_module>
DirectoryIndex index.html
</IfModule>
<Files ".ht*">
Require all denied
</Files>
ErrorLog "logs/error_log"
LogLevel warn
<IfModule log_config_module>
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %b" common
<IfModule logio_module>
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio
</IfModule>
CustomLog "logs/access_log" combined
</IfModule>
<IfModule alias_module>
ScriptAlias /cgi-bin/ "/var/www/cgi-bin/"
</IfModule>
<Directory "/var/www/cgi-bin">
AllowOverride None
Options None
Require all granted
</Directory>
<IfModule mime_module>
TypesConfig /etc/mime.types
AddType application/x-compress .Z
AddType application/x-gzip .gz .tgz
AddType text/html .shtml
AddOutputFilter INCLUDES .shtml
</IfModule>
AddDefaultCharset UTF-8
<IfModule mime_magic_module>
MIMEMagicFile conf/magic
</IfModule>
EnableSendfile on
IncludeOptional conf.d/*.conf
[root@node101.yinzhengjie.org.cn ~]#

[root@node101.yinzhengjie.org.cn ~]# egrep -v "^ *#|^$" /etc/httpd/conf/httpd.conf#查看默认的主配置文件，该配置文件并没有显示指定持久连接配置参数，官方文档中却指出了默认是开启的，如下图所示。

Persistent Connection：
连接建立，每个资源获取完成后不会断开连接，而是继续等待其它的请求完成，如下图所示，默认开启持久连接。

断开条件：
时间限制：以秒为单位，默认5s，httpd-2.4支持毫秒级，如果指定为毫秒值需要显式指定时间单位，如"KeepAliveTimeout 300ms"。

副作用：
对并发访问量大的服务器，持久连接会使有些请求得不到响应

折中方案：
使用较短的持久连接时间

二..自定义持久连接时间

1>.自定义配置文件

[root@node101.yinzhengjie.org.cn ~]# cat /etc/httpd/conf.d/keepalive.conf
KeepAlive On
KeepAliveTimeout
[root@node101.yinzhengjie.org.cn ~]#
[root@node101.yinzhengjie.org.cn ~]# httpd -t
Syntax OK
[root@node101.yinzhengjie.org.cn ~]#
[root@node101.yinzhengjie.org.cn ~]# systemctl reload httpd
[root@node101.yinzhengjie.org.cn ~]#
[root@node101.yinzhengjie.org.cn ~]# ss -ntl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN *: *:*
LISTEN *: *:*
LISTEN ::: :::*
[root@node101.yinzhengjie.org.cn ~]#
[root@node101.yinzhengjie.org.cn ~]#

2>.测试

[root@node101.yinzhengjie.org.cn ~]# telnet 172.30.1.101 80#注意，连接成功后，若在咱们规定的20秒内没有和httpd服务端发送消息，则服务端的持久连接自动就断开啦~
Trying 172.30.1.101...
Connected to 172.30.1.101.
Escape character is '^]'.
Connection closed by foreign host.
[root@node101.yinzhengjie.org.cn ~]#
[root@node101.yinzhengjie.org.cn ~]# telnet 172.30.1.101
Trying 172.30.1.101...
Connected to 172.30.1.101.
Escape character is '^]'.
GET /index.html HTTP/1.1#此处我们使用GET方法，请求的资源为"/index.html"，指定HTTP协议的版本号为"HTTP/1.1"
HOST: 1.1.1.1 #此处配置的是headers信息中的HOST信息，并没有配置其它参数，后面紧接着是一个换行符
#紧接着我们需要连续输入2个换行符，下面的请求方式一样。
HTTP/1.1 OK
Date: Sat, Dec :: GMT
Server: Apache/2.4. (CentOS)
Last-Modified: Sat, Dec :: GMT
ETag: "25-599131e54e9d8"
Accept-Ranges: bytes
Content-Length:
Content-Type: text/html; charset=UTF-https://www.cnblogs.com/yinzhengjie/
GET /info.html HTTP/1.1
HOST: 2.2.2.2HTTP/1.1 OK
Date: Sat, Dec :: GMT
Server: Apache/2.4. (CentOS)
Last-Modified: Sat, Dec :: GMT
ETag: "1f-59917e0ae7f18"
Accept-Ranges: bytes
Content-Length:
Content-Type: text/html; charset=UTF-<h1>尹正杰到此一游</h1>
GET /student.html HTTP/1.1
HOST: 3.3.3.3HTTP/1.1 OK
Date: Sat, Dec :: GMT
Server: Apache/2.4. (CentOS)
Last-Modified: Sat, Dec :: GMT
ETag: "13-59917e2931d98"
Accept-Ranges: bytes
Content-Length:
Content-Type: text/html; charset=UTF-<h1>尹正杰</h1>
Connection closed by foreign host.
[root@node101.yinzhengjie.org.cn ~]#