Debian + nginx + php environment for reverse proxy and server load balancer tutorial

Configure the nginx PHP environment

Install nginx

Sudo apt-get install nginx

After nginx is installed, you can access: http: // localhost/

Install php

Sudo apt-get install php5-cli php5-cgi php5-fpm php5-mcrypt

Php5-fpm: one of the ways to work with nginx, the other is: spawn-fcgi.

Configure nginx virtual host

Add/etc/nginx/sites-available/default

Server {
Listen 90;
Index. php;
Root/usr/share/nginx/mytest/
Access_log/usr/share/nginx/mytest/acc. log combined;
Location ~ . Php $ {
Fastcgi_pass unix:/var/run/php5-fpm.sock;
Fastcgi_index index. php;
Include fastcgi_params;
    }
    }

Where "/var/run/php5-fpm.sock" is the listen of "/etc/php5/fpm/pool. d/www. conf", remember to restart nginx

Sudo/etc/init. d/nginx restart

Test php support

Edit "/usr/share/nginx/mytest/index. php"

<? Php
Phpinfo ();
?>

If nginx fails to be started, you can view the nginx error log.

/Var/log/nginx/error. log

Completely uninstall nginx

When configuring nginx for experiment, the configuration is incorrect, resulting in no access to the virtual host. The nginx configuration file directory (/etc/nginx) has been deleted, and I have not backed up these configuration files, so I want to reinstall nginx.

The following apt-get command is used directly.

Sudo apt-get -- purge remove nginx
Sudo apt-get install nginx

But in fact, no nginx configuration file is automatically generated, and no/etc/nginx directory is generated.
So autoremove

Sudo apt-get -- purge remove nginx
Sudo apt-get autoremove
Sudo apt-get install nginx

Prompt

Awk: cannot open/etc/nginx. conf (No such file or directory)

Although the/etc/nginx directory is generated, only some configuration files are generated.

Conf. d sites-available sites-enabled

Therefore

Sudo apt-get -- purge remove nginx
Sudo apt-get autoremove

Dpkg -- get-selections | grep nginx

List software related to nginx,

Nginx-common deinstall

Then sdfsd

Sudo apt-get -- purge remove nginx-common
Sudo apt-get install nginx

Then OK!


Reverse proxy or load

This involves the upstream command. Set a set of proxy_pass in "/etc/nginx/sites-available/default".

Upstream first_proxy {
Server 10.9.31.89: 5001 weight = 4 max_fails = 2 fail_timeout = 30 s;
        }

The server command is used to specify the name and parameters of the backend server. The server name can be a domain name, IP address, port number, or UNIX Socket.
Specify proxy_pass in VM host configuration

Server {
Listen 99;
Location /{
# If the backend server returns an error of 502 or 504 execution timeout, it will be forwarded to another service in the upstream server load balancer pool for failover.
# Proxy_next_upstream http_502 http_504 error timeout invalid_header
Proxy_pass http: // first_proxy;
Proxy_set_header Host www.yourdomain.com;
Proxy_set_header X-Forwarded-For $ remote_addr;
        }
        }

Then you can access the 10.9.31.89: 5001 service through http: // localhost: 99. Only one backend server is configured here. If multiple backend servers are configured, simple round robin is used to achieve load performance.