choose server backend to some URL with haproxy

Question

To some URL I don't want use some server. So use other.

Actually I have this haproxy configuration.

global daemon log 127.0.0.1 local0 #log loghost local0 info maxconn 4096 #debug #quiet user haproxy group haproxy defaults log global mode http option httplog option dontlognull retries 3 option redispatch maxconn 2000 contimeout 5000 clitimeout 50000 srvtimeout 50000 balance roundrobin stats enable stats refresh 5s stats auth admin:123abc789xyz # Set up application listeners here. listen application 0.0.0.0:10000 server localhost 127.0.0.1:10100 weight 1 maxconn 5 check server externe 127.0.0.1:10101 weight 1 maxconn 5 check 

By example I want all url to /users be served only by server localhost, not by externe.

Answer 1

We did something similar on our servers. What we did was first to set up a frontend proxy, which using HAProxy's ACL allows to use one or another backend. In your example it could be something like the following:

frontend application bind 0.0.0.0:10000 acl use_localhost path_reg ^/users$ use_backend localhost if use_localhost default_backend externe backend localhost server localhost 127.0.0.1:10100 weight 1 maxconn 5 check backenb externe server externe 127.0.0.1:10101 weight 1 maxconn 5 check 

In the example use_localhost is the name of the ACL. You can use plenty of different ACLs. I hope this gives you something to start with.