NGINX Cookbook

How it works...

We create a shared memory space with the limit_conn_zone directive so that the connections can be tracked. We use $binary_remote_addr to track the remote (client) IP address and then name our zone conlimitzone. Finally, we allocate 10 MB by appending the zone name with :10m. This is the total space allocation, which is enough to track up to 160,000 concurrent IP addresses.

In our server block directive, we then use our zone by setting limit_conn to the zone name conlimitzone. This limit is then set to a total of 1 connection, which ensures that each unique IP address is only allowed to make a single connection.

Finally, we use limit_rate (as shown in our previous recipe) to limit the bandwidth per connection. As we have set ...