I’ve been working on using Rancher for manager our dashboard applications, part of this has involved exposing multiple kibana containers from the same port, and one kibana 3 container exposing on port 80. However I’ve hit a problem where it’ll work 80% of the time, but randomly a JS or CSS file will 503 which will cause the dashboard to not load correctly.
I have configured the LB to send requests on specified ports: 5602, 5603, 5604 to specific containers, so I setup the following docker-compose.yml config:
kibana: image: rancher/load-balancer-service ports: - 5602:5602 - 5603:5603 - 5604:5604 links: - kibana3:kibana3 - kibana4-logging:kibana4-logging - kibana4-metrics:kibana4-metrics labels: io.rancher.loadbalancer.target.kibana3: 5602=80 io.rancher.loadbalancer.target.kibana4-logging: 5603=5601 io.rancher.loadbalancer.target.kibana4-metrics: 5604=5601
Everything works as expected, but I get sporadic 503’s. When I go into the container and look at the haproxy.cfg I see:
frontend d898fb95-ec51-4c73-bdaa-cc0435d8572a_5603_frontend bind *:5603 mode http default_backend d898fb95-ec51-4c73-bdaa-cc0435d8572a_5603_2_backend backend d898fb95-ec51-4c73-bdaa-cc0435d8572a_5603_2_backend mode http timeout check 2000 option httpchk GET /status HTTP/1.1 server cbc23ed9-a13a-4546-9001-a82220221513 10.42.60.179:5603 check port 5601 inter 2000 rise 2 fall 3 server 851bdb7d-1f6b-4f61-b454-1e910d5d1490 10.42.113.167:5603 server 215403bb-8cbb-4ff0-b868-6586a8941267 10.42.85.7:5601
The IPs listed are all three Kibana containers, the first container has a health check has it, but none of the others do (kibana3/kibana4.1 dont have a status endpoint). My understanding of the docker-compose config is it should have only the one server per backend, but all three appear to be listed, I assume this is in part down to the sporadic 503s, and removing this manually and restarting the haproxy service does seem to solve the problem. I’ve tried this via docker-compose.yml file and through the interface and the problem occurs on both.
If particular log files are required I can access them and post as needed.
I am configuring the load balancer incorrectly or is this worth raising as a Github issue with Rancher?