What is the nginx map function?
Nginx Map map allows you to mass assign a input variable to a certain outcome variable.
The below runs through all the redirects and checks if the current url is among the ones to redirect, if it is a variable called $new_uri is defined, further down we check if the variable is defined, and redirect if so.
map $uri $new_uri {
/old.html /index.html;
}
server {
listen 80 default_server;
listen [::]:80 default_server;
# Old website redirect
if ($new_uri) {
rewrite ^ $new_uri permanent;
}
}If you have a lot of redirects you can also create mapping files
map $uri $new_uri
{
include /etc/nginx/redirects.map;
}and in /etc/nginx/redirects.map;
^/products.html$ /offer.html redirect;
^/services.html$ /offer.html permanent;
^/about-us.html$ /about.html permanent;
^/another.html$ /another-new.html redirect;
^/another-another.html$ /another-another-new.html permanent;
^/another-another-another.html$ /another-another-another-new.html redirect;The reason why the map function is used is to avoid something like this, if you have alot of redirects this can quickly get out of hand.
rewrite ^/products.html$ /offer.html redirect;
rewrite ^/services.html$ /offer.html permanent;
rewrite ^/about-us.html$ /about.html permanent;
rewrite ^/another.html$ /another-new.html redirect;
rewrite ^/another-another.html$ /another-another-new.html permanent;
rewrite ^/another-another-another.html$ /another-another-another-new.html redirect;