HAProxy is a reverse proxy for high availability environments.
Pull the image from Docker Hub:
$ sudo docker pull modularitycontainers/haproxyRun the container:
$ sudo docker run -p 80:80 --name haproxy modularitycontainers/haproxyHere is a simple demo where HAProxy balances load between two httpd backend servers:
- Copy
haproxy.cfgconfig to a well-known location:$ sudo mkdir -p /etc/haproxy $ sudo cp -av ./examples/haproxy.cfg /etc/haproxy/haproxy.cfg
- Run two httpd backend servers:
$ sudo docker run -d -p 8000:8080 --name httpd1 modularitycontainers/httpd $ sudo docker run -d -p 8001:8080 --name httpd2 modularitycontainers/httpd
- Copy systemd service which will take care of haproxy container:
$ sudo cp -av haproxy-container.service /usr/lib/systemd/system/ $ sudo systemctl daemon-reload
- We can start haproxy now:
$ sudo systemctl start haproxy-container
- You should be able to open localhost now and see you are being routed to httpd via haproxy:
$ curl -L -v http:/localhost:80 * Unwillingly accepted illegal URL using 1 slash! * Rebuilt URL to: http://localhost:80/ * Trying ::1... * TCP_NODELAY set * connect to ::1 port 80 failed: Connection refused * Trying 127.0.0.1... * TCP_NODELAY set * Connected to localhost (127.0.0.1) port 80 (#0) > GET / HTTP/1.1 > Host: localhost > User-Agent: curl/7.54.1 > Accept: */* > < HTTP/1.1 403 Forbidden < Date: Fri, 14 Jul 2017 13:11:09 GMT < Server: Apache/2.4.26 (Fedora) < Last-Modified: Fri, 30 Jun 2017 14:42:29 GMT < ETag: "122f-5532e6d2fbf40" < Accept-Ranges: bytes < Content-Length: 4655 < Content-Type: text/html; charset=UTF-8 < <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
- Dockerfile - build container image with haproxy.
- openshift-template.yml - Template for OpenShift to haproxy.