Swarm

Setup Docker EasyHAProxy

This method will use a docker swarm installation to discover the containers and configure the HAProxy. The advantage of this method is that you can discover containers in other nodes from the cluster.

The only requirement is that containers and EasyHAProxy must be in the same docker swarm network. If not, EasyHAProxy will connect the service with the EasyHAProxy service network.

e.g.:

docker network create -d overlay easyhaproxy

And then deploy the EasyHAProxy stack:

version: "3"

services:
  haproxy:
    image: byjg/easy-haproxy
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    deploy:
      replicas: 1
    environment:
      EASYHAPROXY_DISCOVER: swarm
      EASYHAPROXY_SSL_MODE: "loose"
      HAPROXY_CUSTOMERRORS: "true"
      HAPROXY_USERNAME: admin
      HAPROXY_PASSWORD: password
      HAPROXY_STATS_PORT: 1936
    ports:
      - "80:80/tcp"
      - "443:443/tcp"
      - "1936:1936/tcp"
    networks:
      - easyhaproxy

networks:
  easyhaproxy:
    external: true

And then:

docker stack deploy --compose-file docker-compose.yml easyhaproxy

Mapping to /var/run/docker.sock is necessary to discover the docker containers and get the labels;

Do not add more than one replica for EasyHAProxy. To understand that see limitations page.

Running containers

To make your containers "discoverable" by EasyHAProxy, that is the minimum configuration you need:

version: "3"

services:
  container:
    image: my/image:tag
    deploy:
      replicas: 1
      labels:
        easyhaproxy.http.host: host1.local
        easyhaproxy.http.port: 80
        easyhaproxy.http.localport: 8080
    networks:
      - easyhaproxy

networks:
  easyhaproxy:
    external: true

Note: The services to be discovered don't need to be in the same network as EasyHAProxy is.

Once the container is running, EasyHAProxy will detect automatically and start to redirect all traffic from example.org:80 to your container.

You don't need to expose any port in your container.

Please follow the docker label configuration to see other configurations available.

Setup the EasyHAProxy container

You can configure the behavior of the EasyHAProxy by setup specific environment variables. To get a list of the variables, please follow the docker container environment

More information

You can refer to the Docker Documentation to get other detailed instructions.

Open source ByJG