The principle and usage of Nginx
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Nginx
Load balancing:
When the number of visits to the website reaches a certain extent, when a single server can not meet the requirements of users, it is necessary to use multiple server clusters to ensure the normal operation of the server, and load balancing can make multiple servers share the load equally.
Reverse proxy: browser-> Nginx (reverse proxy)-- > server-- > browser
Advantages: security, cross-domain
Code:
Server {
Listen 80
Server_name 119.23.231.91
Location / {
Proxy_pass http://119.23.231.91:8080;
}
}
Load balancing (cluster):
Advantages:
When a falls down, you can use the b server to share the pressure on the server. if a has been accessed, you can go to the b server to find it, which greatly reduces the pressure on the server.
Code:
# load balancer: down (do not participate), ip_hash (fixed server), weight (priority)
Upstream name {
Server localhost:8081 weight=3
Server localhost:8082 weight=1
Server localhost:8083 weight=1
}
Server {
Listen 80
Server_name localhost
Location / {
Proxy_pass http://name;
}
}
Multiple servers: multiple server servers can be implemented using multiple nginx servers.
Server {
Listen 80
Server_name 119.23.231.91
Location / {
Proxy_pass http://119.23.231.91:8080;
}
}
Server {
Listen 9090
Server_name 119.23.231.99
Location / {
Proxy_pass http://119.23.231.99:8080;
}
}
Command:
Start: C:\ nginx start nginx
End: C:\ nginx nginx-s quit or stop
Overload: C:\ nginx nginx-s reload
There is a problem:
1.session sharing.
two。 Upload and download access to pictures and files
Solution:
1.redis 's session cache or stores the mysql database
two。 Set up a special file server
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