HAProxy Version

version	date
[HAProxy 2.8]	2023-05-31
[HAProxy 2.7]	2022-12-01
HAProxy 2.6	2022-05-31
HAProxy 2.5	2021-11-23
HAProxy 2.4	2021-05-13
HAProxy 2.3	2020-11-05

HAProxy 2.8

• OCSP Stapling
  • 以前 set ssl ocsp-response
  • 现在内置支持 ocs-update on
  • 全局配置参数
    • tune.ssl.ocsp-update.mindelay
    • tune.ssl.ocsp-update.maxdelay
  • 新 Command
    • update ssl ocsp-response
    • show ssl ocsp-updates
• HTTP 压缩后端 Request & Response

backend webservers
  balance roundrobin
  server web1 192.168.56.10:8080 check maxconn 30

  filter compression
  compression direction both
  compression offload
  compression algo-req gzip
  compression type-req application/json
  compression algo-res gzip
  compression type-res text/css text/html text/javascript text/plain

• HTTP Forwarded Header
  • 在 option forwarde 之上控制
  • rfc7239_is_valid
  • rfc7239_field
  • rfc7239_n2nn
  • rfc7239_n2np
• HTTP Actions
• Tuning HTTP/2 Performance
  • tune.h2.be.initial-window-size
  • tune.h2.be.max-concurrent-streams
  • tune.h2.fe.initial-window-size
  • tune.h2.fe.max-concurrent-streams
  • tune.h2.initial-window-size
  • tune.h2.max-concurrent-streams
• Defaults for Listener Sharding
  • tune.listener.default-shards
• Default ALPN Values
  • 默认 h2,http/1.1
  • 配置了 QUIC 会增加 h3
• Fetch Method
  • bc_rtt, bc_rttver
• 集成 acme.sh
  • add the deploy script for acme.sh in admin directory
  • 支持直接颁发证书
• Signing Algorithms for TLS
  • ssl-default-bind-client-sigalgs
  • ssl-default-bind-sigalgs
• 支持使用 WolfSSL 编译
• Lua
  • mailers - 之前为 C 现在为 Lua 模块
  • New Event Framework in Lua
    • core.event_sub(), Server.event_sub()
  • Queues in Lua - core.queue()
  • Lua Functions for Server Information
  • Timeout for Lua execution
  • Disable the Default Resolvers Section for the HTTP Client
    • global httpclient.resolvers.disabled on

global
  lua-load /etc/haproxy/mailers.lua

defaults
  email-alert mailers smtp_servers
  email-alert from [email protected]
  email-alert to [email protected]
  email-alert level info

mailers smtp_servers
  mailer mailserver1 mailserver1.example.com:25

---

• https://github.com/rnwood/smtp4dev
  • Email 测试服务
• https://www.haproxy.com/blog/announcing-haproxy-2-8

HAProxy 2.7

• Traffic shaping
  • 下载速度
    • filter bwlim-out
    • http-response set-bandwidth-limit
  • 上传速度
    • filter bwlim-in
    • http-request set-bandwidth-limit
• thread-group
  • 之前最多 64 个线程 - thread-group 1 threads 64
  • 现在可以 64*64=4096 个线程 - thread-group 64 threads 64
• QUICv2

echo "reload" | sudo socat -t300 /run/haproxy-master.sock -

• show startup-logs

HAProxy 2.6

• HTTP/3 over QUIC
• Generic hash load balancing algorithm
  • balance hash pathq
• 支持 OpenSSL 3.0
• Master CLI
  • HAProxy worker processes
  • socat /run/haproxy-master.sock -
• http-request set-var, tcp-request content set-var 支持 选项
  • ifexists, ifnotexists, ifempty, ifnotempty, ifset, ifnotset, ifgt, iflt

# 显示所有配置
haproxy -dKhelp -q -c -f /dev/null
# 某个主题下的配置项
haproxy -dKacl -q -c -f /dev/null

frontend mysite
  # enables HTTP/3 over QUIC
  bind quic4@:443 ssl crt /etc/haproxy/certs/foo.com/cert.pem alpn h3
  # 支持 stateless reset packets https://tools.ietf.org/id/draft-ietf-quic-transport-29.html#name-stateless-reset
  #cluster-secret

Reload

global
  stats socket /var/run/haproxy/api.sock mode 660 level admin expose-fd listeners

HAProxy 2.5

• QUIC, HTTP/3 - 实验支持
• 完整动态服务支持
  • 2.4 动态服务不支持 check, track, slowstart, error-limit, ssl, observe
• 支持在 defaults 配置 tcp-request 和 http-request 规则
• Lua
  • 新增 httpclient - 可发起请求
• Announcing HAProxy 2.5

# 特性检查
haproxy -cc 'feature(PROMEX)' || echo not supported

# runtime api shell
socat stdio tcp4-connect:127.0.0.1:9999

experimental-mode on

global
  nbthread 40

defaults frontend-defaults
  log global
  mode http
  option httplog
  option dontlognull
  timeout client  10m
  # 新增
  http-request redirect scheme https unless { ssl_fc }

frontend mysite from frontend-defaults
  mode http
  # 废弃 process 使用 thread
  # 新增 shards 参数 - 等同于多次 bind
  bind :80 thread 1-20 shards 2 name website
  bind :443 ssl crt /etc/haproxy/ssl/cert.pem
  default_backend webservers

HAProxy 2.4

变化非常大

• 协议
  • HTTP2/WebSocket
    • rfc8441 HTTP CONNECT
  • FIX - Financial Information eXchange
  • MQTT
    • 包有效性校验
    • 基于客户端标识路由
• 负载均衡
  • 支持 TCP DNS
  • 熔断增强 - http_fail_cnt, http_fail_rate
• SSL/TLS
  • 动态 SSL 证书存储 - 不再需要重启
  • 允许动态 SNI 链接复用 - sni req.hdr(host)
• Observability
  • 内置 OpenTracing
  • Prometheus 增加指标
  • 统计增加 SSL/TLS 模块相关 - stats show-modules
• 缓存
  • 支持 Vary 头 - process-vary on
  • 最大缓存条目控制 - max-secondary-entries 10
• 配置
  • 支持预处理
    • .if <condition> ... .elif <condition> ... .else ... .endif
    • .diag, .notice, .warning, .alert
      • -dD 显示诊断信息
    • 条件
      • defined(<name>)
      • feature(<name>) - haproxy -vv
        • OT - OpenTracing
      • streq(<str1>,<str2>), strneq(<str1>,<str2>)
      • version_atleast(<ver>), version_before(<ver>)
  • 默认路径 - default-path
  • 默认命名 - default http-defaults from tcp-defaults
  • 动态超时 - http-request set-timeout
  • TCP 升级 HTTP - fe tcp, be http - tcp-request content switch-mode
  • 匹配删除 HTTP 头 - http-request del-header X-Forwarded -m beg
  • 新增实验模式 - 开启实验功能
    • 动态服务
      • 通过 runtime api 新增服务
    • 变量修改
• Lua
  • 多线程 - lua-load-per-thread
• 参考
  • Announcing HAProxy 2.4

# runtime api
echo "help add" | socat /var/run/haproxy/api.sock -
echo "show state" | socat /var/run/haproxy/api.sock -

# 服务
echo "experimental-mode on; add server be_app/app4 192.168.1.22:80" | socat /var/run/haproxy/api.sock -
echo "experimental-mode on; del server be_app/app4" | socat /var/run/haproxy/api.sock -
# 变量
echo "experimental-mode on; get var proc.myapp_version" | socat /var/run/haproxy/api.sock -
echo "experimental-mode on; set var proc.myapp_version str(green)" | socat /var/run/haproxy/api.sock -
echo "experimental-mode on; get var proc.myapp_version" | socat /var/run/haproxy/api.sock -

HAProxy 2.3

• 链接增强 - 为支持 QUIC 和 UDP 做准备
  • 完善 Linux keepalive - 支持 sysctl 修改参数
• 协议 - Syslog TCP/UDP
• 负载均衡
  • balance uri path-only - 解决 HTTP1 和 HTTP2 地址不一样问题
• SSL/TLS
  • 允许静态 SNI 链接复用 - sni str(example.local)
• Observability
  • stats HTTP 2 信息 - stats show-modules
  • 基于 SPOE 集成 OpenTracing
• Lua 5.4
• 参考
  • Announcing HAProxy 2.3