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The following will give you a detailed explanation of the dependence on installing Nginx, Nginx reverse proxy, load balancing and so on. I hope it can bring some help to you in practical application. Load balancing involves more things, there are not many theories, and there are many books on the Internet. Today, we will use the accumulated experience in the industry to do an answer.

Dependencies for installing Nginx:

Yum-y install pcre-devel zlib-devel openssl-devel

Install the association of the source package Nginx:

To first create a system user to manage Nginx

Useradd-M-s / sbin/nologin nginx

. / configure-prefix=/usr/local/nginx-user=nginx-group=nginx-with-http_ssl_module-with-http_stub_status_module

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I. Nginx reverse proxy

1. Configure the environment with a Nginx, a test CVM, and web1

[root@web1 ~] # yum install-y httpd

two。 Start httpd

[root@web1 ~] # service httpd start is starting httpd: [OK]

3. Write the page on the httpd page

[root@web1 ~] # vim / var/www/html/index.html iiiiiiiiiiiiiiiiiiiiii

4. Configure Nginx reverse proxy

Vim / usr/local/nginx/conf/nginx.conflocation / {proxy_pass http://192.168.18.201;}

5. The page visits the IP of Nginx, and the page configured by httpd will be displayed.

II. Nginx load balancing

One Nginx, two web servers

1. Configure nginx load balancer

[root@nginx ~] # vim / usr/local/nginx/conf/nginx.confupstream webservers {server 192.168.18.201 weight=1; # weight server 192.168.18.202 weight=1;} server {listen 80; server_name localhost; # charset koi8-r; # access_log logs/host.access.log main; location / {proxy_pass http://webservers; Proxy_set_header X-Real-IP $remote_addr;}}

Note that upstream is defined outside server {} and cannot be defined inside server {}. Once the upstream is defined, it can be referenced with proxy_pass.

two。 Reload the configuration file

[root@nginx ~] # pkill ngixn [root@nginx ~] # / usr/local/nginx/sbin/nginx

3. Page testing

Note: if you keep refreshing, you will find that web1 and web2 appear alternately, achieving the effect of load balancing.

Third, Nginx page cache

Proxy_cache_path / data/nginx/cache levels=1:2 keys_zone=one:10m inactive=1m max_size=30g

If inactive=1m caches are not accessed for 1 minute, nginx will delete the maximum space in these cached hard drives to 30g.

1. Configure a simple Nginx cache server

[root@nginx ~] # vim / etc/nginx/nginx.confproxy_cache_path / data/nginx/cache/webserver levels=1:2 keys_zone=webserver:20m max_size=1g; upstream webservers {server 192.168.115.87 root@nginx 8080 weight=1 max_fails=2 fail_timeout=2;} server {listen 80; server_name localhost; # charset koi8-r; # access_log logs/host.access.log main Location / {proxy_pass http://webservers; proxy_set_header X-Real-IP $remote_addr; proxy_cache webserver; proxy_cache_valid 200 10m;}}

two。 Establish a cache directory

[root@nginx ~] # mkdir-pv / data/nginx/cache/webserver

Note: the directory created should be the same as the path written in the configuration file

3. Restart Nginx

[root@nginx ~] # pkill ngixn [root@nginx ~] # / usr/local/nginx/sbin/nginx

4. Refresh the page, and then stop the httpd server. After refreshing, you will find that the page will still exist, and then go to the web server to view the cache file.

[root@web1 63] # pwd/data/nginx/cache/webserver/f/63 [root@C0S1 63] # ls681ad4c77694b65d61c9985553a2763f # cache file

IV. Separation of Nginx read and write

1 modify the configuration file

[root@nginx nginx] # vim / usr/local/nginx/conf/nginx.confserver {listen 80; server_name localhost; # charset koi8-r; # access_log logs/host.access.log main; location / {proxy_pass http://192.168.18.202; If ($request_method = "PUT") {proxy_pass http://192.168.18.201;}

two。 Restart Nginx

[root@nginx ~] # pkill ngixn [root@nginx ~] # / usr/local/nginx/sbin/nginx

3. Configure the WebDAV feature of httpd

Note, just enable it below.

4. Restart httpd

[root@web1 ~] # service httpd restart stop httpd: [OK] starting httpd: [OK]

5. Test it

[root@nginx ~] # curl http://192.168.18.201web1.test.com[root@nginx ~] # curl http://192.168.18.202web2.test.com

Note, both web1 and web2 access are fine.

[root@nginx] # curl-T / etc/issue http://192.168.18.202405 Method Not AllowedMethod Not AllowedThe requested method PUT is not allowed for the URL / issue.Apache/2.2.15 (CentOS) Server at 192.168.18.202 Port 80

Note: when we upload files to web2, because web2 is human-readable, there is no WebDAV function for opening an account, so it shows 405 Method Not Allowed.

[root@web1] # setfacl-m u:apache:rwx / var/www/html/

Let's test it again.

[root@nginx] # curl-T / etc/issue http://192.168.18.201201 CreatedCreatedResource / issue has been created.Apache/2.2.15 (CentOS) Server at 192.168.18.201 Port 80

Note, you can see that we have successfully uploaded the file, indicating that the nginx read-write separation function has been configured. Finally, let's take a look at the uploaded file.

[root@web1] # cd / var/www/html/ [root@web1 html] # ll Total amount 12drwxr-xr-x 2 root root 4096 September 4 13:16 forum-rw-r--r-- 1 root root 23 September 3 23:37 index.html-rw-r--r-- 1 apache apache 47 September 4 14:06 issue

After reading the above details about the dependence on installing Nginx, Nginx reverse proxy, load balancing and so on, if there is anything else you need to know, you can find what you are interested in in the industry information or find our professional and technical engineers to answer, technical engineers have more than ten years of experience in the industry.

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