request help: Health Checks can support Backup server?

[souzens]

Issue description

health Check plugin in base on Kong lua-resty-healthcheck.

I need a function that can mark an upstream server as backup.
It will be passed requests when only the primary servers are unavailable.

##LIKE NGINX UPSTREAM CONFIG

upstream  testproxy  {
        server   192.168.1.14:8080;
        server   192.168.1.200:8080 backup;
}

USE nginx upstream on http://nginx.org/en/docs/http/ngx_http_upstream_module.html

Environment

• apisix version (cmd: apisix version): 1.4
• OS: centos7

[membphis]

I know this is a bit complicated, I will try to see if there is a simpler way later.

127.0.0.1:9999 is an invalid upstream.
It'll choose 127.0.0.1:1980 when the 127.0.0.1:9999 turn to unhealthy.

curl -i http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "uri": "/index.html",
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:9999": 1,
            "127.0.0.1:1980": 0
        },
        "checks": {
            "active": {
                "http_path": "/status",
                "host": "test",
                "healthy": {
                    "interval": 2,
                    "successes": 1
                },
                "unhealthy": {
                    "interval": 1,
                    "http_failures": 2
                }
            },
            "passive": {
                "healthy": {
                    "http_statuses": [200, 201],
                    "successes": 3
                },
                "unhealthy": {
                    "http_statuses": [500, 502],
                    "http_failures": 3,
                    "tcp_failures": 3
                }
            }
        }
    }
}'

[souzens]

and another request:

sometimes http work and health check listen on different ports ,

like spring boot cloud
http api request works on 8080,
but actuator health works on 8888 port

so a router config like :

            "active": {
                "http_path": "/actuator/health",
                "port": "8888",
                "host": "test",
                "healthy": {
                    "interval": 2,
                    "successes": 1
                },
                "unhealthy": {
                    "interval": 1,
                    "http_failures": 2
                }
            },
            "passive": {
                "healthy": {
                    "http_statuses": [200],
                    "successes": 3
                },
                "unhealthy": {
                    "http_statuses": [503,404],
                    "http_failures": 3,
                    "tcp_failures": 3
                }
            }

i did not find any health port define in https://github.com/apache/incubator-apisix/blob/master/apisix/schema_def.lua#L81

is it supported now ?

[membphis]

@souzens #1809 (comment)

you should create a new issue about this new question. they were two different things.

[spacewander]

The zero weight node trick works well with most occasions, but it doesn't with chash or least conn balancer.