Introduced in 0.28.0
Dokku provides integration with the Haproxy proxy service by utilizing the Docker label-based integration implemented by EasyHaproxy.
haproxy:report [<app>] [<flag>] # Displays a haproxy report for one or more apps haproxy:logs [--num num] [--tail] # Display haproxy log output haproxy:set <app> <property> (<value>) # Set or clear an haproxy property for an app haproxy:show-config <app> # Display haproxy compose config haproxy:start # Starts the haproxy server haproxy:stop # Stops the haproxy server
caddy plugin integration requires the
docker-compose-plugin for Docker. See this document from the Docker documentation for more information on the installation process for the
As using multiple proxy plugins on a single Dokku installation can lead to issues routing requests to apps, doing so should be avoided. As the default proxy implementation is nginx, users are encouraged to stop the nginx service before switching to Haproxy.
The Haproxy plugin has specific rules for routing requests:
- Haproxy integration is exposed via docker labels attached to containers. Changes in labels require either app deploys or rebuilds.
- While Haproxy will respect labels associated with other containers, only
webcontainers have Haproxy labels injected by the plugin.
https:443port mappings are supported at this time.
- Requests are routed as soon as the container is running and passing healthchecks.
Switching to Haproxy
To use the Haproxy plugin, use the
proxy:set command for the app in question:
This will enable the docker label-based Haproxy integration. All future deploys will inject the correct labels for Haproxy to read and route requests to containers. Due to the docker label-based integration used by Haproxy, a single deploy or rebuild will be required before requests will route successfully.
Any changes to domains or port mappings will also require either a deploy or rebuild.
Starting Haproxy container
Haproxy can be started via the
haproxy:start command. This will start a Haproxy container via the
docker compose up command.
Stopping the Haproxy container
Haproxy may be stopped via the
The Haproxy container will be stopped and removed from the system. If the container is not running, this command will do nothing.
Showing the Haproxy compose config
For debugging purposes, it may be useful to show the Haproxy compose config. This can be achieved via the
Customizing the Haproxy container image
While the default Haproxy image is hardcoded, users may specify an alternative by setting the
image property with the
Checking the Haproxy container's logs
It may be necessary to check the Haproxy container's logs to ensure that Haproxy is operating as expected. This can be performed with the
This command also supports the following modifiers:
You can use these modifiers as follows:
The above command will show logs continually from the vector container, with an initial history of 10 log lines
Changing the Haproxy log level
Haproxy log output is set to
ERROR by default. It may be changed by setting the
log-level property with the
After modifying, the Haproxy container will need to be restarted.
The haproxy plugin only supports automatic ssl certificates from it's letsencrypt integration. Managed certificates provided by the
certs plugin are ignored.
Enabling letsencrypt integration
By default, letsencrypt is disabled and https port mappings are ignored. To enable, set the
letsencrypt-email property with the
After enabling, the Haproxy container will need to be restarted and apps will need to be rebuilt. All http requests will then be redirected to https.
Customizing the letsencrypt server
The letsencrypt integration is set to the production letsencrypt server by default. To change this, set the
letsencrypt-server property with the
dokku haproxy:set --global letsencrypt-server https://acme-staging-v02.api.letsencrypt.org/directory
After enabling, the Haproxy container will need to be restarted and apps will need to be rebuilt to retrieve certificates from the new server.
Displaying Haproxy reports for an app
You can get a report about the app's Haproxy config using the
You can run the command for a specific app also.
You can pass flags which will output only the value of the specific information you want. For example: