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��<VirtualHost>��ö��һ����(main_server)��а��ж��塣��<VirtualHost>��ö��ж��Ľ����(vhost)��

Listen, ServerName, ServerPath, ServerAliasָ��Գ��һ��ε��κεط��ÿ��ָ��Ḳ��ǰ��ֵ�ͬ��(��Ǹ��)��

��Listenָ��Ĭ��ֵ��80��û��Ĭ�ϵ�ServerPath��ServerAliasָ��ֵ��ServerName��Ĭ��ֵ��ɷ��IP��ַ�ƶ϶��

��Listenָ��ܣ��һ�Ǿ��Apache��Ҫ�󶨵��˿ڣ��ض��ָ��URI��ʹ�õĶ˿ںš�

����Ķ˿���Ӱ�쵽Apache�ļ��˿ڡ�

ÿ��VirtualHostָ��еĵ�ַ��Ը��һ��ѡ�Ķ˿ڡ��û�н��ر��ָ��˿�Ĭ��Ϊ��һ��Listenָ��ָ��ֵ��Ķ˿�"*"��ʾƥ��ж˿ڡ��һϵ�е�ַ(��DNS��ѯ��A��¼)ͳ����ַ��(address set)��

��û�ж�һ��ض��IP��ַʹ��NameVirtualHostָ���ô��һ��ʹ��ַ��Ϊ��IP��IP��ַҲ��ͨ��"*"��ʾ��

��ʹ��˻��ô����NameVirtualHostָ��Ϊ��ָ��IP��ַ��仰˵��ļ��ͨ��NameVirtualHostָ��ָ��ӳ��(CNAME)��IP��ַ��

��ʹ�úܶ�NameVirtualHostָ��ֱ��Ӧһ��NameVirtualHostָ���ÿ��ض��"IP:port"��˵��ֻ��ʹ��һ��NameVirtualHostָ�

NameVirtualHost��VirtualHostָ��ֵ�˳�򲢲��Ҫ��ֻ�ж�Ӧͬһ��IP��ַ��VirtualHostָ��Ĵ��Ҫ�ġ��ȫ��ͬ�ģ�

NameVirtualHost 111.22.33.44 <VirtualHost 111.22.33.44> # server A ... </VirtualHost> <VirtualHost 111.22.33.44> # server B ... </VirtualHost> NameVirtualHost 111.22.33.55 <VirtualHost 111.22.33.55> # server C ... </VirtualHost> <VirtualHost 111.22.33.55> # server D ... </VirtualHost>

<VirtualHost 111.22.33.44> # server A </VirtualHost> <VirtualHost 111.22.33.55> # server C ... </VirtualHost> <VirtualHost 111.22.33.44> # server B ... </VirtualHost> <VirtualHost 111.22.33.55> # server D ... </VirtualHost> NameVirtualHost 111.22.33.44 NameVirtualHost 111.22.33.55

(Ϊ��ʹ��ļ��߿ɶ��ԣ��Ƽ��ʹ��ߵĸ�ʽ)

�ڽ��VirtualHostָ��VirtualHostָ��е�һ��ֶ�Ӧ�Ķ˿��ΪĬ�ϵ�Listen�˿ڡ�

��ָ��ͬһ��ַ��Ļ��VirtualHostָ��е��б��õ��ServerAliasָ��һ��Ĵ��(��ᱻ��ServerAlias��串��)��ע�⣬��Դ��Listenָ���Ӱ�쵽�Ǹ��ַ��Ķ˿ںš�

�ڳ�ʼ��Ĺ��У��Ϊÿһ��IP��ַ��һ��б��뵽һ��ɢ�б��С��IP��ַ��һ��NameVirtualHostָ��еģ��б��ָ��Ϊ��IP��ַ�Ļ��û��IP��ַ��ôNameVirtualHostָ���ԣ��־�м�¼һ��Ϣ��ڻ��IP��ԣ��ɢ�б��е��б�Ϊ�ա�

��Ϊʹ��˸�Ч��ɢ��㷨��ʹ��󵽴��ʱ��в��IP��ַ�Ŀ��ú�С��߸��迼�ǡ��Ϊֻ��һ��˽��λ��ͬ��IP��ַ��Ż��

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��û��ServerAdmin, ResourceConfig, AccessConfig, Timeout, KeepAliveTimeout, KeepAlive, MaxKeepAliveRequests, ReceiveBufferSize, SendBufferSizeָ���ô��̳��ǵ�ֵ��(Ҳ��˵��ʹ��ֵ��趨ֵ)��
��Ĭ��Ŀ¼Ȩ�޽��̳��(��ģ��ÿ��Ŀ¼��Ϣ)��
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��ϣ��ڽ��ÿ��ʱ�򣬳䵱��һ��Ĭ��ֵ��Ľ�ɫ��Щ��еĶ��λ��޹ؽ�Ҫ�ġ��֮ǰ��Ѿ��ˡ��Լ�ʹһ��ó��ĺ��棬��Ҳͬ��Ӱ�쵽��á�

��û�ж��е�ServerName ��ô��httpd��Ļ��档��ǽ��DNS��Ҵ�ServerName��ص�IP��ַ��Ϊ��ַ��(main_server address set)��

��û�ж��ServerName��£�һ��Ĭ�ϲ��ö��ʱ��VirtualHostָ��ȳ��ֵĵ�ַ��

��ʹ��"_default_"ͨ��ͬ��ServerName ��

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��ͻ��˵�һ��ӵ�ʱ�򣬻��ڲ��IPɢ�б��в��ҿͻ��Ҫ��ӵ�IP��ַ��

��ʧ��(û��ҵ��Ӧ��IP��ַ)��Ķ˿��ִ��һ��"_default_"��ô��󽫻��ŷ��û��ҵ��"_default_"��ô��󽫻��ŷ��

��ɢ�б��û��ҵ�IP��ַ��һ��"NameVirtualHost *"ָ��Ķ˿ں��ƥ�䣬��ô��

��ҳɹ�(�ҵ��˶�Ӧ��IP��ַ��б�)��һ��ǿ��Ҫ��һ��IP��һ��

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��ص��б��б�Ϊ�գ��ô��Ǵ��ľ��һ��IP��ֱ�ӽ��д��衣

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��ص��б��һ��Ľṹ��ô��Ǵ��ľ��һ��б��˳��ļ��ӦVirtualHostָ��ֵ�˳��ͬ�ġ�

��б��е�һ��(Ҳ��ļ��е�һ��ָ��IP��ַ��)�Դ��ߵ��ȼ��ж�δ֪��û��"Host:"ͷ��󶼽��д��

��ͻ��ṩ��һ��"Host:"ͷ��ô��б��в��ҵ�һ��ServerName��ServerAlias��ϵ��ŷ��󡣾��"Host:"ͷ�п��԰��˿ںţ��Apache��ǻ��յ��Ǹ��ʵ�˿��ƥ�䡣

��ͻ��ύ��һ��"Host:"ͷ��HTTP/1.0��ǽ��޷�ȷ�Ͽͻ��Ҫ��Ǹ��һ��ServerPath��ͻ��ύ��е�URI��Ӧ��ô�б��е�һ��ŷ��

��Ҳ��Ӧ��ô��󽫻��ɿͻ��ӵ�IP��Ӧ��б��еĵ�һ��Ķ˿��ͬ��ŷ�(��ǰ��)��

��ͻ��IP��֮�以�಻��š��IP��ֻ��ܷ��͵��ַ��󣬶��IP��ַ��Ҳ��һ��ֻ��NameVirtualHostָ���ĵ�ַ��ķ��ʡ�
��Զ��һ��IP��ִ��ServerAlias��ServerPath��顣
��ļ��У��IP��"_default_"��NameVirtualHostָ��ֵ�˳�򲢲��Ҫ��ĳ��ָ��ĵ�ַ��˵��˳��ǲ��ܻ��ģ��ļ��н��ȳ��ֵ��Ӧ�ĵ�ַ��нϸߵ��Ȩ��
��ڰ�ȫ�ԵĿ��ǣ��"Host:"ͷ�г��ֵĶ˿ںŽ��ƥ�䡣Apache��һֱʹ�ÿͻ��ӵ��ʵ�˿��Ϊƥ�䡣
��һ��ServerPathָ��Ǻ��ֵ��һ��ServerPathָ��ǰ׺��ǰ�߽��ƥ�䣬��߽��ԡ�(��۵��û��"Host:"ͷ��ֿ��)
��IP��ʹ��ͬһ��ַ��ļ��ȳ��ֵ��Ǹ��ƥ�䡣��ܷ��ʱ�򡣵��ʱ�򣬻��־�ļ��д��һ��Ϣ��
��û��Ͽͻ��IP��ַ�Ͷ˿ں�ʱ��"_default_"��ŻᲶ������"_default_"��Ķ˿ں�(Ĭ��ֵ��Listenָ��)��ͻ��˷��Ŀ�Ķ˿ں��ʱ��Żᱻ��Ҳ��ʹ��ͨ��(��磺"_default_:*")��κζ˿ںŵ��Ҳͬ��"NameVirtualHost *"��
��ͻ��ӵ�Ŀ��IP��ַ�Ͷ˿ں�û��ָ��Ҳ��κ�һ��(��"_default_"��)ƥ��ʱ�򣬲Ż��ŷ��󡣻��仰˵��û��ָ��IP��ַ�Ͷ˿ڵ��(��Ǵ��һ��ƥ��˿ڵ�"_default_"��)��
��ͻ��ӵ�һ��ڻ��ʹ�õĵ�ַ(�Ͷ˿�)��˵ʹ��NameVirtualHostָ���ôһ��δ֪�Ļ�û��"Host:"ͷ������"_default_"��ƥ�䡣
��Բ��VirtualHostָ��ʹ��DNS��ƣ��ķ��ͻ��DNS��ң��޷��б��е��ٰ�ȫ��в��ù��
Ӧ��Ϊÿ��趨ServerName ��ͻ��ҪΪÿ��DNS��ѯ��

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��Ķ��VirtualHost��֮ǰ(Ϊ��ӿɶ��)��ʹ��ԱߵĶ��Ӱ�쵽��е��ⲻ��׷��֡�
��Ӧ��NameVirtualHost��VirtualHost��ŵ�һ��Ի�ø��õĿɶ��ԡ�
��ǰһ��ServerPaths�Ǻ�һ��ServerPaths��ǰ׺��޷��ȷ��ļ��"��ǰ��ں�"(Ҳ��˵��"ServerPath/abc/def"Ӧ��"ServerPath/abc"֮ǰ)��

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