@stefws wrote:

Trying to put HAp 1.8.19 in between elastic clients and elastic 6.8.1 ingest/coordinate nodes, but even though HAp have a healthy backend, it claims no service available, when hitting the frontend, hints appreciated, TIA.

tcpdumped reply to clients on HAp

E…@.@…J>.)…R.#…9d…`…P…F…HTTP/1.0 503 Service Unavailable
Cache-Control: no-cache
Connection: close
Content-Type: text/html

503 Service Unavailable

No server is available to handle this request.

tcpdumped HAp health check reply on backend:

E..f..@.@..L>.)E>.)L#.....n.g...P.......HTTP/1.0 200 OK
content-type: application/json; charset=UTF-8
content-length: 487
{
  "name" : "es-i1",
  "cluster_name" : "mxes2data",
  "cluster_uuid" : "SmpMKhEwQs2r0G4eNOBJTA",
  "version" : {
    "number" : "6.8.1",
    "build_flavor" : "default",
    "build_type" : "rpm",
    "build_hash" : "1fad4e1",
    "build_date" : "2019-06-18T13:16:52.517138Z",
    "build_snapshot" : false,
    "lucene_version" : "7.7.0",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}

HAproxy config snippet:

defaults
   maxconn 1024
   email-alert mailers sysadminmailer
   email-alert from "${INSTANCE}@${DOMAIN}"
   email-alert to "${ALERTEE}"
   mode http
   rate-limit sessions 20
   #log global
   #option  httplog
   option  dontlognull             # Do not log connections with no requests
   option  dontlog-normal          # Do not log successfull connections, ie. log on servers
   option  contstats               # Enable continuous traffic statistics updates
   retries 2                       # Try to connect up to 2 times in case of failure
   timeout connect 30s             # max to connect or to stay in queue
   timeout client 30s
   timeout server 30s
   timeout http-keep-alive 1s      # max for the client to post next request
   timeout http-request 15s        # max for the client to send a request
   timeout queue 30s               # max queued on load balancer
   timeout check 60s               # timeout health check read
   backlog 1000                    # Size of SYN backlog queue
   source 0.0.0.0 usesrc clientip  # transparent proxy mode
   balance leastconn

frontend fe-esi
   bind-process 6
   bind ipv4@*:9200 transparent mss 1460
   default_backend be-esi

backend be-esi
   bind-process 6
   option httpchk GET /
   default-server inter 30s downinter 60s rise 2
   server i1 ipv4@es-i1:9200 check

Screenshot 2019-07-13 at 10.31.06.png1418×167 32.3 KB

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