docker/haproxy/haproxy.cfg - main - dgrigorev/VoidCache

docker/haproxy/haproxy.cfg
80 строк4 KB
Dmitry Grigorev
Added cluster configuration
10 мар 2026, 14:42
10 мар 2026, 14:423490c77
# haproxy.cfg  –  HAProxy config for VoidCache cluster
#
# Mode: TCP (layer 4) — passes RESP3 wire protocol through untouched.
# Health check: sends PING\r\n, expects +PONG.
# Balance: leastconn — routes new connections to the least-busy node.
#
# Stats UI: http://localhost:8404/stats   (user: admin / pass: admin)
# ─────────────────────────────────────────────────────────────────────────────

global
    maxconn         50000
    log             stdout  format raw  local0
    tune.bufsize    32768

    # Allow HAProxy to resolve backend hostnames at runtime, not just startup.
    # This is required in Docker Compose because container DNS may not be ready
    # when HAProxy first starts.
    setenv RESOLVERS_ENABLED 1

defaults
    mode            tcp
    log             global
    option          tcplog
    option          dontlognull
    option          redispatch
    retries         3
    timeout connect 3s
    timeout client  5m
    timeout server  5m
    timeout check   2s

# ── Docker internal DNS resolver ─────────────────────────────────────────────
# 127.0.0.11 is Docker's embedded DNS server (always present in any container).
# hold valid: cache a successful DNS lookup for 10s before re-querying.
# hold nx/refused/other: retry failed lookups after 1s.
resolvers docker
    nameserver dns1 127.0.0.11:53
    resolve_retries 3
    timeout resolve 1s
    timeout retry   1s
    hold nx      1s
    hold refused  1s
    hold other    1s
    hold valid   10s
    hold obsolete 0s

# ── Stats & monitoring ────────────────────────────────────────────────────────
frontend stats
    bind            *:8404
    mode            http
    stats enable
    stats uri       /stats
    stats realm     VoidCache\ HAProxy
    stats auth      admin:admin
    stats refresh   5s
    stats show-legends
    stats show-node

# ── VoidCache frontend ────────────────────────────────────────────────────────
frontend vcache_frontend
    bind            *:6379
    default_backend vcache_nodes

# ── VoidCache backend ─────────────────────────────────────────────────────────
backend vcache_nodes
    balance         leastconn
    option          tcp-check

    # Health check: send RESP inline PING, expect PONG
    tcp-check connect
    tcp-check send  "PING\r\n"
    tcp-check expect string "+PONG"

    # resolvers docker  — use Docker DNS for runtime resolution
    # init-addr none    — do NOT fail at startup if hostname doesn't resolve yet;
    #                     HAProxy will retry until the container comes up
    # resolve-prefer ipv4 — skip IPv6 lookup (not needed in Docker bridge networks)
    server vcache-1 vcache-1:6379 check inter 5s fall 3 rise 2 weight 10 resolvers docker init-addr none resolve-prefer ipv4
    server vcache-2 vcache-2:6379 check inter 5s fall 3 rise 2 weight 10 resolvers docker init-addr none resolve-prefer ipv4
    server vcache-3 vcache-3:6379 check inter 5s fall 3 rise 2 weight 10 resolvers docker init-addr none resolve-prefer ipv4