Nginx web server does support if conditional configuration. You can redirect and/or select configuration depending on client ip address. In this case you need to use the variable called $remote_addr which can be used to retrieve information about the users ip address. This is useful if you want to give file upload capabilities to your own office IP address and read-only capabilities to the rest of the world based upon client IP address or vpn address:
File upload is disabled on
server {A,B,C} via php
+------+ +-----+ +-----+ +-----+
| | | | | | | |
| | | | | | | |
Backends | A | | B | | C | | D | File upload enabled
| | | | | | | | on server D via PHP
| | | | | | | |
| | | | | | | |
+--+---+ +-+---+ +--+--+ +-+---+
| | | |
| | | |
+--------+---------+-------+
|
|
+---+---+
| |
| |
| |
| |
| |
| |
+-------+
nginx reverse proxy server
Edit the file /etc/php.ini on server {A,B,C}, type:
# vi /etc/php.ini
Make the following changes to /etc/php.ini:
# Disallow uploading altogether this makes moving or injecting bad scripts/code onto your web server more difficult file_uploads = Off # Disallow treatment of file requests as fopen calls allow_url_fopen = Off allow_url_include = Off |
Restart Apache server on {A,B,C}. Make sure file upload is enabled on server A by editing php.ini and setting the following entries:
file_uploads = On upload_max_filesize=2M post_max_size=4M |
Nginx syntax
The syntax is as follows:
if ( $remote_addr ~* ip-address-here ) {
proxy_pass http://YOUR-BACKEND-HERE;
}First set default proxy_pass:
## Default backend is apachereadonly ## proxy_pass http://apachereadonly; |
Check for client ip address:
## If IP is 1.2.3.4 send backend to apachereadwrite ## if ( $remote_addr ~* 1.2.3.4 ) { proxy_pass http://apachereadwrite; } |
Examples
Edit nginx.conf file, enter:
# vi nginx.conf
Edit/append as follows:
## apachereadonly backend ## upstream apachereadonly { server 10.10.11.10:8011; server 10.10.11.11:8011; server 10.10.11.12:8011; ip_hash; } ## apachereadwrite backend ## upstream apachereadwrite { server 10.10.11.13:8011; } ## config ## location / { proxy_set_header Accept-Encoding ""; proxy_set_header Host $http_host; proxy_set_header X-Forwarded-By $server_addr:$server_port; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header X-Real-IP $remote_addr; ## default backend proxy_pass http://apachereadonly; ## send traffic to apachereadwrite backend if ip is 1.2.3.4 ## if ( $remote_addr ~* 1.2.3.4 ) { proxy_pass http://apachereadwrite; } proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504; } ## rest of config ## |
Save and close the file. Restart / reload nginx server:
# /etc/init.d/nginx reload
OR
# /usr/sbin/nginx -s reload
3 comment
Other way is to use MAP module for switching backends for special remote addresses
http://nginx.org/en/docs/http/ngx_http_map_module.html
Example of configuration:
## apachereadonly backend ## upstream apachereadonly { server 10.10.11.10:8011; server 10.10.11.11:8011; server 10.10.11.12:8011; ip_hash; } ## apachereadwrite backend ## upstream apachereadwrite { server 10.10.11.13:8011; } ## define default backend and backend for special remote addresses map $remote_addr $backend { default apachereadonly; 1.2.3.4 apachereadwrite; } ## virtual host server { listen 80; server_name example.com; # your configuration here location / { proxy_set_header Accept-Encoding ""; proxy_set_header Host $http_host; proxy_set_header X-Forwarded-By $server_addr:$server_port; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header X-Real-IP $remote_addr; proxy_pass http://$backend; proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504; } }Also, GEO module http://nginx.org/en/docs/http/ngx_http_geo_module.html could be used in same way as MAP module
With geo module you can define networks (in CIDR notation), that map doesn’t support
I wasn’t aware of map module. I appreciate your post and time for sharing examples :)