Haproxy backend with path. com:80 check Is that possible? I saw an .

Haproxy backend with path Dec 28, 2022 · Hi, I want to configure a HAProxy in front of other 2 load balancers which serve 2 k8s clusters. 4. com and beta. txt`) and use the `acl` directive to control routing based on dynamic conditions. As an example, right now, I have a standard 1-to-1 setup for the ACLs and the corresponding Aug 29, 2025 · Differences between this package and HAProxy used directly HAProxy defines five main sections in its configuration. However, is it possible to make the back end be a URL which includes a path (not unlike what you would do with apache or nginx when setting up virtual hosting). Stop haproxy with ctrl-C and start haproxy again via your process manager (or whatever method you use to start haproxy usually). com:7170 check I want to add /web For instance, to route the request to a specific backend if the requested URL path begins with /images/, place the name of the ACL after an if statement at the end of a use_backend line: Jun 13, 2018 · I have a path I’m using to identify itself to for an acl but I need a different path for the backend server. Also, set You can use path_end or path_beg to match the path. Keyboard navigation : You can use left and right arrow keys to navigate between chapters. Our tutorial walks you through setting up frontends, backends, and simple routing rules. I have my backend defined as: server server1 ns. but I did it this way (each one in its own line, seems in comments code can't be in multiple lines): acl my_subfolder path_beg -i /app-2-another-path/ http-request Apr 11, 2023 · Hi, I am new to HAProxy and struggling to configure my path based routing correctly. The following video is an overview of backends in an HAProxy configuration file and showcases several load balancing algorithms. Maybe you want to elaborate, providing the full configuration and the output of haproxy -vv ? global log 127. 1:8081. Need to check if it is set by default. There are four essential sections to an HAProxy configuration file. . Our HAProxy Support team is here to help you with your questions and concerns. Feb 12, 2025 · From there, HAProxy helps to route to the available server as we’ve defined a backend load_balancer. Apr 4, 2023 · Is it possible to configure an HAProxy backend with multiple servers and different path prefix for each server? I want something like this: backend mybackend server Sep 7, 2019 · I am a newb to HAProxy, and am bashing my head against this one. cfg -d You will then see the entire requests and response in your terminal. Oct 5, 2018 · Requests come in to HAProxy on a path matching /ApplicationA/rest/of/path, /ApplicationB/rest/of/path, /ApplicationC/rest/of/path, and based on the application letter (A, B, C) HAProxy is to pass the request onto one of a number of backend servers. Nov 3, 2016 · I am new to haproxy (actually proxy'ing in general) and I can't figure out how to add a path to my backend. Set a variable # To set a variable, use one of the following directives: http-request set-var http-response set-var http-after-response set-var While the declared ACL style is generally more readable and reusable, you can, if you prefer, include the ACL declaration in the use_backend directive itself, with use_backend be2 if { path_beg /tag-02 }. 0. foo. Oct 13, 2021 · We do not have any SNI configured as such at our backend server. 3. Jul 19, 2018 · We have a lot of projects with subdomains, so we set up haproxy to rewrite the path to match the subdomain and we have a CNAME for each project to projects. com:80 check Is that possible? I saw an Nov 14, 2022 · Works like it is supposed to work for me. Why HAProxy? Use conditionals to forward traffic to different backends # You configure a frontend to send traffic to a backend by using the default_backend directive. Mar 30, 2025 · Whenever I start using path_reg, even with a simple pattern, HAProxy seems to stop evaluating the other path-based ACLs properly. unicorn. Backend Describes a set of servers to which the proxy Jul 23, 2024 · This guide will walk you through configuring HAProxy as a gateway for your backend services, complete with examples involving three different servers. The load balancer looks for commas and applies the replacement to each value it finds. 9) the log states: The 'reqirep' directive is not supported anymore since HAProxy 2. This guide will specifically cover path-based routing in HAProxy. Integrate the load balancer with Prometheus. By default, the Prometheus server scrapes the URL /metrics. 2. The conf… For example, the path fetch is available during the request phase but not during the response phase; however, you can access the path during the response phase by storing it in a variable. To change this path, set the metrics_path parameter in the scrape_configs section of the Prometheus configuration file. there is mysite. Is this something that needs to be set at both app server and HAProxy backend server config? We do not have mode set to tcp anywhere, is it required? Sep 25, 2023 · Learn more about HAProxy ACL Path Beg. Jun 29, 2025 · HAProxy can direct traffic to various destinations using different methods. Jan 28, 2025 · Learn how to configure HAProxy for HTTP load balancing, with instructions on updating frontend and backend settings, path-based routing, and health checks. However, you can choose a different backend with the use_backend directive followed by a conditional statement. 6 When using HAProxy for virtual hosting, I can see how to use the Host from the header at the front end to decide what backend to route to. otherdomain. Currently it does support maps for vhost: frontend xyz <other_lines> use_backend backend1 if { hdr (Host) -i Dec 8, 2022 · It sounds like you need to modify responses to add back the path when HAProxy responds on behalf of the backend server. Learn the syntax and follow step-by-step examples to block traffic, redirect users, choose backends, and enhance security. I’m trying to set up what I think is a fairly simple exercise in mapping applications listening on various ports to specific URLs. In this guide we'll explain how to use some of these strange config. A backend section defines a pool of servers to which the load balancer will route requests. Jan 5, 2019 · I would like to setup HAProxy to redirect to a particular backend based on the variable in the acl rule. Global Defines options that process-wide and often OS-specific. This is typically done in the Location header. com) AND It's an api request OR I Mar 11, 2023 · Hi, I hope to use the right terms for my explanation of the configuration I’m trying to operating with HAProxy. Sep 13, 2018 · A practical guide to HAProxy ACLs. My issue seems to be the fact that HAProxy tries to use relative paths from backend. Assuming your app Jul 5, 2021 · Learn to configure a basic HAProxy load balancer from scratch. e. backend backend-http option forwardfor server web-1 site. HAProxy Path-based routing is handy when you need to send different paths to different servers. A word of caution: Some apps will let you play with this. I would like to have absolute paths used, so instead of “/” I need https://fqdn/ For example, I have to use this check where an absolute path is set: option httpchk GET https://as-infra-gtm. Host over HTTPS # To serve the Prometheus endpoint over HTTPS: Edit the load balancer configuration and add the ssl parameter to the bind line to enable HTTPS. infra Apr 27, 2023 · How redirect specific url path to another backend? Help! elnur99 April 27, 2023, 8:50am 1 Apr 19, 2018 · I am attempting to use a backend under the following condition: It is the prod site being requested (i. Use 'http-request replace-header' instead. Anyway, if 'd like to change request path to backend, using 'http-request set-uri' and using reg-sub pattern. 1. 1:8080 and 127. Others send file payloads that include a relative path as the app expects it, so modifying the location header causes a mismatch and breaks things. Frontend Describes a set of listening sockets accepting client connections. For example, requests to the path /cart would go to the backend named cartservers, while requests to /reviews would go to the backend named reviewservers. Set the URL path # Use http-request set-path to change the requested URL path before relaying it to a backend server. Jun 16, 2016 · Does HAProxy support domain name to backend mapping for path based routing. com and path rewriting as you did in your question. Defaults Sets default parameters for all other sections following its declaration. 1 local0 defaults mode http timeout connect 5000 timeout client 50000 timeout server 50000 frontend http_in bind :80 use_backend bk_one if { path_sub /string1/ } { method POST } use_backend bk_two if { path_sub /string1/ } { method PUT } use Feb 2, 2021 · To map paths to backends using a map, create a use_backend line that uses the path fetch method to get the URL path and the map_beg converter to find that path in the map file. This backend sits on top of two servers that resolve at 127. Jul 15, 2016 · if using this on more recent haproxy (version 2. They are global, defaults, frontend, and backend. Segregating Requests by Path Sep 27, 2024 · By examining the URL path, HAProxy intelligently routes requests to the appropriate backend. com: listen projects_example_com bind ip_address:443 … Dec 7, 2022 · In your backend application1 add host rewriting: http-request set-header host appserver1. Converted with haproxy-dconv v0. Here is my haproxy. I'm not sure if you need to rewrite anything in response, but if you do, then it will same as in request, just use http-response instead. 2-15 on 2025/10/03 frontend www bind :80 acl begins_with_api path_beg /api/v2/ http-request redirect code 301 prefix /api/v2 unless begins_with_api default_backend webservers Jun 4, 2020 · I am quite familiar with the HTTP protocol and a little bit of HAProxy, but I have never really messed with URL rewrites and redirects before. Below, we change the URL path for JPG images so that it begins with /images/, but only if not already set: Map files for path-based routing # Another common use case for map files is path-based routing: you choose which backend to send a request to based on the requested URL path. Li Mar 11, 2018 · No, stop haproxy, and start it manually from the command line with the -d argument: haproxy -f /path/to/haproxy. example. website1. These conditionals are called ACLs. In this post, we demonstrate its four most essential sections. I am using consul discovery and load-balance consul service through HAProxy. Jul 18, 2020 · I’m saying add :443 to the backend server configuration in haproxy, because otherwise haproxy will connect to port 9090 on the cloundfront server, since that is the frontend port. Aug 22, 2022 · Here's how to deploy the HAProxy load balancer in front of your services and then use path-based routing to direct requests to the correct backend service. How do I remove the first three characters of the path before passing to the backend? passed in the path is /rd/asdffdsa1213 and to the backend server it should be /asdffdsa123. mysite. We’ll add further configuration to make it work like an API Gateway with respect to the use cases. These four sections define how the server as a whole performs, what your default settings are, and how client requests are received HAProxy has a lot of special configuration options that can be hard to understand. Now, I have 2 &quot;simple&quot; HTTP redirect require Oct 24, 2018 · An HAProxy configuration file guides the behavior of your HAProxy load balancer. In fact, sometimes none of the ACLs match anymore, and requests that should be blocked end up allowed. For even more flexibility, we can define a list of all backends in a file (`all_backends. cfg defaults mode http frontend stats bind *:1936 stats uri / stats show-legends no log frontend http_front bind *:80 default_backend emailHandler acl emailservice path_beg /email use_backend emailHandler if Feb 14, 2024 · How to configure HAproxy to a different backend based on path? Ask Question Asked 1 year, 8 months ago Modified 1 year, 8 months ago Map files for path-based routing # Another common use case for map files is path-based routing: you choose which backend to send a request to based on the requested URL path. I wish I could tell HAPROXY to detect 2 words in the URL and then redirect to the right backend. e8ezaoa dly1gh d8iv bsje v4l pqtb nbh swmc oozwve v2mzv