testbed/haproxy-standby.cfg at main · GreptimeTeam/testbed · GitHub

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# haproxy-standby exposes the CLIENT-FACING ports (11040-11043) for the
# Enterprise active/standby standalone pair and routes traffic ONLY to the
# elected leader.
#
# Each enterprise standalone exposes /status/standalone/is_leader:
#   - HTTP 200 when this node is the ready leader
#   - HTTP 503 (SERVICE_UNAVAILABLE) when it is a follower
# haproxy treats 2xx as UP and 503 as DOWN, so only the leader backend is ever
# marked available — exactly the active/standby routing we want.
#
#   standby-a -> 127.0.0.1:11070 (http) / 11071 (grpc) / 11072 (mysql) / 11073 (pg)
#   standby-b -> 127.0.0.1:11074 (http) / 11075 (grpc) / 11076 (mysql) / 11077 (pg)
#
# This binds the same client-facing ports 11040-11043 as haproxy / standalone /
# standalone-fs, so it is mutually exclusive with those modes (never run them at
# the same time). Client code (psql/mysql/http) works identically everywhere.
#
# NOTE: requires an ENTERPRISE greptime binary — /status/standalone/is_leader is
# an enterprise-only endpoint.

global
  maxconn 256

defaults
  mode tcp
  timeout connect 5s
  timeout client 10m
  timeout server 10m
  retries 3

frontend fe_http
  bind *:11040
  mode http
  default_backend be_http

frontend fe_grpc
  bind *:11041
  default_backend be_grpc

frontend fe_mysql
  bind *:11042
  default_backend be_mysql

frontend fe_postgres
  bind *:11043
  default_backend be_postgres

# HTTP backend: health-check the leader endpoint directly on the HTTP port.
backend be_http
  mode http
  option httpchk GET /status/standalone/is_leader
  http-check expect status 200
  server standby-a 127.0.0.1:11070 check
  server standby-b 127.0.0.1:11074 check

# TCP backends: route client TCP to the service port, but health-check the
# leader endpoint on each node's HTTP port (via `check port`). A node is only UP
# while it returns 200 from /status/standalone/is_leader, i.e. while it is the
# elected leader.
backend be_grpc
  mode tcp
  option httpchk GET /status/standalone/is_leader
  http-check expect status 200
  server standby-a 127.0.0.1:11071 check port 11070
  server standby-b 127.0.0.1:11075 check port 11074

backend be_mysql
  mode tcp
  option httpchk GET /status/standalone/is_leader
  http-check expect status 200
  server standby-a 127.0.0.1:11072 check port 11070
  server standby-b 127.0.0.1:11076 check port 11074

backend be_postgres
  mode tcp
  option httpchk GET /status/standalone/is_leader
  http-check expect status 200
  server standby-a 127.0.0.1:11073 check port 11070
  server standby-b 127.0.0.1:11077 check port 11074