nginx learning nine upstream load balancing

Keywords: Nginx

grammar

Syntax: upstream name {...}
Default:--
Context:http

Status of backend server in load balancing scheduling:

down	The current server does not participate in load balancing temporarily
backup	Reserved backup server
max_fails	Number of requests allowed to fail
fail_timeout	Service pause time after Max failed
max_conns	Limit the maximum number of connections received

Scheduling algorithm of nginx:

polling	Allocate to different back-end servers in chronological order
Weighted polling	The higher the weight value, the higher the access probability assigned
ip_hash	Each request is allocated according to the hash result of the access IP, so that the request from the same IP accesses one
least_conn	The minimum number of connections. The machine with the least number of connections will be distributed
url_hash	The request is allocated according to the hash result of the visited URL. Each URL is directed to the same back-end server
hash key value	hash custom key

For example, / etc/nginx/conf.d/default.con

server {
    listen       8001;
    server_name  localhost;

    #charset koi8-r;
    access_log  /var/log/nginx/server.access.log  main;

    location / {
        root   /opt/app/code1;
        index  index.html index.htm;
    }
... ...
}

server {
    listen       8002;
    server_name  localhost;

    #charset koi8-r;
    access_log  /var/log/nginx/server.access.log  main;

    location / {
        root   /opt/app/code2;
        index  index.html index.htm;
    }
... ...
}

server {
    listen       8003;
    server_name  localhost;

    #charset koi8-r;
    access_log  /var/log/nginx/server.access.log  main;

    location / {
        root   /opt/app/code3;
        index  index.html index.htm;
    }
... ...
}


server {
    listen       80;
    server_name  localhost;

    #charset koi8-r;
    access_log  /var/log/nginx/test_proxy.access.log  main;

    location / {
        proxy_pass http://test_upstream;
    }
... ...
}


##General poll
upstream test_upstream {
	server localhost:8001;
	server localhost:8002;
	server localhost:8003;
}

Weighted polling

upstream test_upstream {
    server localhost:8001;
    server localhost:8002 weight=5;
    server localhost:8003;
}

Backup node

upstream test_upstream {
    server localhost:8001 down; 
    server localhost:8002 backup;
    server localhost:8003 max_fails=1 fail_timeout=10s;
}

ip_hash

upstream test_upstream {
	ip_hash;
	server localhost:8001; 
	server localhost:8002;
	server localhost:8003;
}

URL hash syntax (from version 1.7.2)

Syntax: hash key [consistent];
Default: --
Context: upstream

##Example:
upstream test_upstream {
	hash $request_uri;
	server localhost:8001; 
	server localhost:8002;
	server localhost:8003;
}

Posted by zavin on Sat, 04 Jan 2020 14:54:52 -0800

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nginx learning nine upstream load balancing

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