Keepalived 提高吞吐量、负载均衡 ip_hash、负载均衡 url_hash 与 least_conn

upstream tomcats { 
	# server 192.168.1.173:8080 max_fails=2 fail_timeout=1s; 
	server 192.168.1.190:8080; 
	# server 192.168.1.174:8080 weight=1; 
	# server 192.168.1.175:8080 weight=1; 
	keepalive 32; 
}
server {
	listen 80; 
	server_name www.tomcats.com; 
	location / { 
		proxy_pass http://tomcats; 
		proxy_http_version 1.1; 
		proxy_set_header Connection ""; 
	} 
}

upstream tomcats { 
	ip_hash; 
	server 192.168.1.173:8080; 
	server 192.168.1.174:8080 down; 
	server 192.168.1.175:8080; 
}
 

upstream tomcats { 
	# url hash 
	hash $request_uri; 
	# 最少连接数 
	# least_conn 
	server 192.168.1.173:8080; 
	server 192.168.1.174:8080; 
	server 192.168.1.175:8080; 
}
server { 
	listen 80; 
	server_name www.tomcats.com; 
	location / { 
		proxy_pass http://tomcats; 
	} 
}