標籤：nginx的讀寫分離、$request_method模組
一般網站都是用rsync+inotify實現檔案同步，而rsync+inotify並不能雙向同步，所以這個時候我們就要使用到讀寫分離。拓撲：nginx：192.168.137.50：80
後端web：apache1：192.168.137.51：80
apache2：192.168.137.52：80
這裡我們使用nginx作為反向 Proxy，使用if語句和$request_method模組實現讀寫分離，
配置如下：
server {
listen 80;
server_name localhost;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
proxy_pass http://192.168.137.51/;
if ( $request_method = "PUT"){
proxy_pass http://192.168.137.52;
}
index index.html index.htm;
}
當$request_method為PUT，我們將請求轉寄給只做寫的web端。
重啟nginx，使用curl測試：
[[email protected] conf]# curl http://192.168.137.50
<h1>2.syk.com</h1>
[[email protected] conf]# curl http://192.168.137.50
<h1>2.syk.com</h1>
[[email protected] conf]# curl http://192.168.137.50
<h1>2.syk.com</h1>
[[email protected] conf]# curl http://192.168.137.50
<h1>2.syk.com</h1>
讀取只被轉寄到了192.168.137.51端；
開啟192.168.137.52端apache的上傳模組：
vim /etc/httpd/conf/httpd.conf
在<Directory "/var/www/html">下添加：
dav on即可
[[email protected] conf]# curl -T /etc/passwd http://192.168.137.50
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>403 Forbidden</title>
</head><body>
<h1>Forbidden</h1>
<p>You don‘t have permission to access /passwd
on this server.</p>
<hr>
<address>Apache/2.2.15 (CentOS) Server at 192.168.137.52 Port 80</address>
</body></html>
出現403，是因為apache目錄屬組為root，所以這裡做修改：
setfacl -m u:apache:rwx /var/www/html/
再次測試：
[[email protected] conf]# curl -T /etc/passwd http://192.168.137.50
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>201 Created</title>
</head><body>
<h1>Created</h1>
<p>Resource /passwd has been created.</p>
<hr />
<address>Apache/2.2.15 (CentOS) Server at 192.168.137.52 Port 80</address>
</body></html>
並且我們可以看到，檔案被上傳到了192.168.137.52端。
本文出自 “Linux” 部落格，請務必保留此出處http://syklinux.blog.51cto.com/9631548/1837046
nginx的讀寫分離
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