Docker – How to use HAProxy in load balancing and as a reverse proxy with docker

dockerhaproxylinux-networkingPROXYreverse-proxy

I am using HAProxy docker image to load share between multiple similar containers. It's working fine if I am using a single address like web.abc.com to query only the API containers, which is mapped to my localhost . But now I want to use api.abc.com too with this HAProxy config file .

So the scenario is going to be if I hit web.abc.com it will share the load of web application container using round robin and show me the contents of these containers and if I hit api.abc.com it gives me access of those containers which have the API .

I have tried multiple config changes with my haproxy.cfg , but it's not working .

This is my docker-compose file, and this is the haproxy.cfg I am using , which is obviously not working

Is this scenario even possible with HAProxy ? Help me.

Best Answer

I would make use of https://github.com/jwilder/docker-gen to generate HAProxy configuration on container start / stop.

You can take a look on the use of it in nginx + letsencrypt use case : https://github.com/JrCs/docker-letsencrypt-nginx-proxy-companion

Related Solutions

Mysql – Pacemaker Active/Active haproxy load balancing

I have active-active 2*virtIP cluster

For CRM config:
I'm using two virtual IPs as primitive IPaddr2 services
and for the service which should run on both nodes:

create primitive for it, you'll then use it's ID
make "clone" from it like:
clone any_name_of_the_clone your_primitive_service_id \ meta clone-max="2" clone-node-max="1"

You may add order (to start virt IP after starting clone - NOT primitive, after you create clone you should not use it's child's ID)

It is working, failover works (assigning 2 IPs on one node when other fails).
However I have problem how to make colocation - I mean to have contrained services: I cannot have virtIP on node with subservice failed.
It is OK when the service is down - cluster brings it up but when starting fails (e.g. broken config for the service) - cluster notes error but brings IP up.

Anyone knows what's the cause?
- Is it a matter of bad monitoring/start/stop control or it is a matter of configuring constraints?

EDIT:
I have added to Primitive option to 'op start': on-fail="standby". Now when my service (the only primitive in clone) cannot start the node looses also virtIP
This seems to solve my problem now.

Docker – HAProxy reverse proxying with Docker not working

In the post: https://stackoverflow.com/questions/13994629/haproxy-random-http-503-errors

Matthew Jones answered my question. I was running not one but TEN HAProxy instances each probably with their own config files.

I have NO idea how this happened, I did update the config around 10 times but always used the command service haproxy restart. Weird...

I used the following to acquire the processes and kill them:

ps -ef | grep haproxy
kill <PROCESS NUMBER HERE>
service start haproxy

Best Answer

Related Solutions

Mysql – Pacemaker Active/Active haproxy load balancing

Docker – HAProxy reverse proxying with Docker not working

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