Apache: httpd set-up

Apache

Install

Install httpd via yum

yum install httpd

Virtual Host

vi /etc/httpd/conf/httpd.conf
 
Listen 80
 
NameVirtualHost *:80
<VirtualHost *:80>
    ServerName www.DOMAIN
    DocumentRoot /var/www/html/DIR_DOC_ROOT
</VirtualHost>

Listen on 80 port via http

NameVirtualHost

Set the virtual host with IP address and port.

<VirtualHost>

Take the server's info.

You can use multiple virtual hosts with IP address-based, domain-based, port-based method.

Before you start the httpd service, you have to check system's firewall policy which is 'iptables'

MIME-Type

vi /etc/httpd/conf/httpd.conf
 
TypesConfig /etc/mime.types

You can set the MIME-Types on the file. Or, use AddType like this.

vi /etc/httpd/conf/httpd.conf
 
AddType application/x-tar .tgz

And here is the DefaultType that is considered when MIME-type is not set.

DefaultType text/plain

Content Compression

LoadModule deflate_module modules/mod_deflate.so

To transfer compressed content, Apache uses mod_deflate module. It is default module after Apache 2.2.

vi /etc/httpd/conf/httpd.conf
 
<IfModule mod_deflate.c>
    AddOutputFilterByType DEFLATE text/html
 
    DeflateCompressionLevel 9
 
    BrowserMatch ^Mozilla/4 gzip-only-text/html
    BrowserMatch ^Mozilla/4\.0[678] no-gzip
    BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
 
</IfModule>

AddOutputFilterByType DEFLATE

Using deflate module to compress specific type

DeflateCompressionLevel

Set the level of compression. The value is in range(1 ~ 9) that higher number means high compression rate and need more CPU resources.

BrowserMatch

To take care of User-Agent which is the browser and it's bug.

- Mozilla/4 and 4.x has issue that it could not take the deflate filter.

- Microsoft Internet Explorer notify to server that Mozilla/4 itself.

Content-Encoding: gzip

You can check the compressed content via header in the browser's development mode.

gzip

GNU zip file format which is Lempel-Ziv coding combination with 32bit CRC

deflate

zlib data format combination with deflate compression mechanism.

Cache-Control

Apache uses mod_expires module to control Expires and Cache-Control: max-age HTTP headers.

vi ./httpd.conf
 
<IfModule mod_expires.c>
        ExpiresActive On
        ExpiresByType text/html "access plus 1 minutes"
</IfModule>