Dynamic automatic service discovery based load balancer using Nginx for Rancher environments.
First, launch this service. Then, launch a container with two special labels, e.g.:
example-service:
image: nginx
expose:
- 80
labels:
com.danieldent.rancher-nginx-active-lb.published-host: example.com
com.danieldent.rancher-lets-encrypt.hosts: example.com
An nginx configuration file is automatically generated based on which services are launched in the Rancher environment. This service is designed for an all-SSL environment, and is a companion to rancher-lets-encrypt.
The com.danieldent.rancher-nginx-active-lb.published-host label configures which hostnames will be routed to a
container by rancher-nginx-active-lb, while the com.danieldent.rancher-lets-encrypt.hosts label configures which
hostnames will have SSL certificates managed by rancher-lets-encrypt.
The optional com.danieldent.rancher-nginx-active-lb.published-port label allows exposure of a service running on an
arbitrary port.
If load balancing is done by multiple hosts, this service assumes you are also making use of a system to synchronize the docker volume on which certificates are stored. If a shared volume is not available, an example which uses Resilio Sync to synchronize the certificate directory is available in the example folder.
Future versions may provide more flexibility in the type of nginx configuration which can be generated (e.g. support for mounting containers on a path within a host). Pull requests are welcome.
- Investigate & configure Nginx's protection against repeated POST and other non-idempotent HTTP methods.
- Refactor for greater readibility
- Generalize configuration system
The MIT License (MIT)
Copyright (c) 2016 Daniel Dent
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.