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Linux 负载均衡与高可用网络架构实战

  • 2026-08-20 15:12:51
Linux 负载均衡与高可用网络架构实战

Linux 负载均衡与高可用网络架构实战

一、负载均衡原理与架构选型

核心作用

  • 流量分发(Round-Robin、Least Connections 等)
  • 健康检查
  • 会话保持
  • 扩展性与容灾

常见模式

  • 四层(L4):传输层(TCP/UDP),性能高 → LVS
  • 七层(L7):应用层(HTTP/HTTPS),灵活 → Nginx / HAProxy

架构类型

  • 单臂(Direct Server Return)
  • 双臂(NAT/DR/TUN)
  • 全代理

二、LVS(Linux Virtual Server)四层负载均衡

安装

apt install ipvsadm keepalived   # 或 yum
modprobe ip_vs

IPVS 管理

ipvsadm -A -t 192.168.10.100:80 -s rr          # 添加虚拟服务器
ipvsadm -a -t 192.168.10.100:80 -r 192.168.10.11:80 -m -w 1   # 添加 Real Server(NAT 模式)
ipvsadm -Ln

DR 模式(高性能)

  • Director 与 Real Server 同网段
  • Real Server 设置 VIP(lo:0 接口,arp_ignore=1)

Real Server 配置(/etc/sysctl.conf):

net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2

VIP 配置

ip addr add 192.168.10.100/32 dev lo

三、Nginx 七层负载均衡

配置示例(/etc/nginx/nginx.conf):

http { upstream backend { least_conn; # 最少连接 server backend1.example.com:8080 weight=5 max_fails=3 fail_timeout=30s; server backend2.example.com:8080 weight=5; keepalive 32; } server { listen 80; server_name lb.example.com; location / { proxy_pass http://backend; proxy_http_version 1.1; proxy_set_header Connection ""; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; health_check; # 需要 ngx_http_upstream_healthcheck_module } } }

Session 保持:ip_hash 或 sticky cookie。

TLS 终结:Nginx 处理 HTTPS,减轻后端压力。

四、HAProxy 配置示例

优点:统计丰富、配置灵活。

frontend http-in bind *:80 acl is_health path /health use_backend health if is_health default_backend webservers backend webservers balance roundrobin option httpchk GET /health server web1 192.168.10.11:80 check maxconn 1000 server web2 192.168.10.12:80 check maxconn 1000

五、高可用方案:Keepalived + VRRP

Keepalived 配置(/etc/keepalived/keepalived.conf):

vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51 priority 100 # Backup 设 90 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.10.100/24 } } virtual_server 192.168.10.100 80 { delay_loop 10 lb_algo rr lb_kind DR persistence_timeout 3600 protocol TCP real_server 192.168.10.11 80 { weight 1 TCP_CHECK { connect_timeout 3 } } }

双主热备:两个节点互为主备。

六、生产调优、监控与故障处理

性能调优

  • 调整 net.core.somaxconntcp_max_syn_backlog(第五篇)
  • Nginx worker_processes = CPU 核数
  • 连接池与超时参数

监控

ipvsadm -Ln
nginx -V
echo"GET /status" | nc localhost 8080   # HAProxy stats

Prometheus:node_exporter + blackbox + nginx_exporter + keepalived_exporter。

常见故障

  • VIP 漂移失败:VRRP 优先级、认证不一致、防火墙挡 multicast。
  • 后端不健康:健康检查 URL 错误、网络隔离。
  • 会话丢失:无持久化或后端重启。
  • 性能瓶颈:单节点 LVS 极限 → 结合 Anycast 或多层 LB。

排查

  • tcpdump -i any host VIP
  • Keepalived 日志:journalctl -u keepalived
  • ip addr 查看 VIP 归属

七、云原生与进阶架构

  • Kubernetes:Ingress(Nginx / Traefik)、MetalLB(裸金属 LB)、Service LB。
  • 云厂商:ALB/NLB + Auto Scaling。
  • 全局负载:DNS + AnyCast + GSLB。
  • 服务网格:Istio 流量管理。

最佳实践

  • 多层 LB(L4 + L7)
  • 健康检查 + 自动摘除
  • 配置版本化 + Canary 发布
  • 容量规划与压测(wrk、locust)
  • 零信任 + mTLS

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  1. CONNECT:[ UseTime:0.001162s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001690s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000702s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000677s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001366s ]
  6. SELECT * FROM `set` [ RunTime:0.000629s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001393s ]
  8. SELECT * FROM `article` WHERE `id` = 504093 LIMIT 1 [ RunTime:0.016937s ]
  9. UPDATE `article` SET `lasttime` = 1787300901 WHERE `id` = 504093 [ RunTime:0.001811s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000566s ]
  11. SELECT * FROM `article` WHERE `id` < 504093 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005153s ]
  12. SELECT * FROM `article` WHERE `id` > 504093 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008856s ]
  13. SELECT * FROM `article` WHERE `id` < 504093 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003238s ]
  14. SELECT * FROM `article` WHERE `id` < 504093 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.049376s ]
  15. SELECT * FROM `article` WHERE `id` < 504093 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.027959s ]
0.309104s