I use a HAProxy container as an entry point for a virtual HPC cluster. Depending on a prefix the request is forwarded to different containers.
:80/foswiki/ -> :80/foswiki/ :80/kibana/ -> :80/kibana/ :80/graphite-api/ -> :80/graphite-api/ ...
The config I use is pretty simple:
frontend http-in bind *:80 acl uri_foswiki path_beg /foswiki use_backend srv_foswiki if uri_foswiki # gitlab default_backend srv_gitlab backend srv_foswiki balance roundrobin cookie SERVERID insert option httpclose option forwardfor server foswiki 172.17.0.3:80 cookie
The thing is that there are webservers that serve the website directly as root, without a prefix. 'Graphite-web', e.g. or the gitlab image.
I try to cut the prefix and forward it further, but what I really want, is that the HAProxy keeps the prefix in the path and that it is transparent to the backends server. If I click on 'gitlab_server:80/dashboard/' it should come out as 'frontend_ip:80/gitlab/dashboard'.
backend srv_gitlab balance roundrobin #cookie SERVERID insert mode http reqrep ^([^\ ]*)\ /gitlab/(.*) \1\ /\2 balance roundrobin option forwardfor server gitlab 172.17.0.18:80 cookie
I don't think it is a hard thing to do, but it seems to me, that my google skills are somewhat crippled. Every time I end up with rewrite rules that do not keep the prefix.
EDIT: The internal IP addresses are not reachable by the user...