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Linux 系统运维工程师必备工具箱(第18篇)之高可用集群(Keepalived)搭建

  • 2026-06-29 17:39:07
Linux 系统运维工程师必备工具箱(第18篇)之高可用集群(Keepalived)搭建

作为一线运维,我深知“高可用”三个字的分量。它不仅是架构设计上的承诺,更是每次故障发生时,能否让用户无感的最后防线。最近,我负责搭建一套基于 Keepalived 的 Nginx 高可用集群,本以为是个“常规操作”,结果却踩了不少坑。今天,我就以第一人称,把这套集群的搭建过程和“排坑”经历分享出来,希望能帮你少走弯路。

一、环境准备与基础规划

我手头有两台 CentOS 7.9 服务器,IP 分别是 192.168.1.10 和 192.168.1.11。它们将作为 Keepalived 的节点,对外提供一个虚拟 IP(VIP):192.168.1.100。业务层是 Nginx,两台机器都安装并设置好相同的 Nginx 服务,监听 80 端口。

我的目标是:当主节点(Master)宕机或 Nginx 进程异常退出时,备用节点(Backup)能自动接管 VIP,继续对外提供服务,实现故障自动切换。

二、安装与基础设置

安装 Keepalived 很简单,直接用 yum:

yum install -y keepalived

安装后,重点在于设置文件。Keepalived 的核心设置在 /etc/keepalived/keepalived.conf。我分别设置了主、备两台机器。

主节点(192.168.1.10)设置:

global_defs {
   notification_email {
     admin@example.com
   }
   notification_email_from keepalived@example.com
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_MASTER
}

vrrp_script chk_nginx {
    script "/etc/keepalived/check_nginx.sh"
    interval 2
    weight -20
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.1.100/24 dev eth0
    }
    track_script {
        chk_nginx
    }
}

备节点(192.168.1.11)设置:

global_defs {
   notification_email {
     admin@example.com
   }
   notification_email_from keepalived@example.com
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_BACKUP
}

vrrp_script chk_nginx {
    script "/etc/keepalived/check_nginx.sh"
    interval 2
    weight -20
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.1.100/24 dev eth0
    }
    track_script {
        chk_nginx
    }
}

关键点说明:

  • state:主节点为 MASTER,备节点为 BACKUP。
  • priority:主节点优先级 100,备节点 90。数值越大,越可能成为 MASTER。
  • virtual_router_id:同一个集群内必须一致。
  • track_script:关联一个自定义脚本,用于检测 Nginx 进程状态。

三、核心排坑:Nginx 进程检测脚本

这是第一个大坑。很多新手会忽略 track_script 的作用,或者写一个不完善的检测脚本。我的脚本 /etc/keepalived/check_nginx.sh 内容如下:

#!/bin/bash
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then
    systemctl start nginx
    sleep 2
    if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
        exit 1
    else
        exit 0
    fi
else
    exit 0
fi

排坑点:

  1. 脚本权限:必须赋予执行权限,否则 Keepalived 无法调用。执行 chmod +x /etc/keepalived/check_nginx.sh
  2. 脚本逻辑:我的脚本不是简单地“检测到 Nginx 挂了就通知 Keepalived 降权”,而是先尝试重启 Nginx。如果重启失败,才返回非零值,触发 Keepalived 切换。这样做的好处是,如果 Nginx 只是短暂异常,脚本能自动恢复,避免不必要的 VIP 漂移。
  3. weight 参数:我在设置中设置了 weight -20。当脚本返回非零时,Keepalived 会将当前节点的优先级减去 20。如果主节点优先级从 100 降到 80,而备节点是 90,那么备节点就会成为新的 MASTER,VIP 自动漂移。

四、启动与验证

设置完成后,启动 Keepalived:

systemctl start keepalived
systemctl enable keepalived

查看 VIP 是否在主节点上:

ip addr show dev eth0

正常情况下,主节点 eth0 上会出现 192.168.1.100。

验证故障切换:

  1. 手动停止主节点的 Nginx:systemctl stop nginx
  2. 观察日志:tail -f /var/log/messages,会看到 Keepalived 检测到 Nginx 异常,尝试重启失败后,主动降低优先级,并通知备节点接管。
  3. 此时,在备节点上执行 ip addr show dev eth0,应该能看到 VIP 已经漂移过来。

五、第二个排坑点:网络边界防护与 ARP 问题

在验证过程中,我发现有时 VIP 无法 ping 通,或者客户端访问时断时续。排查后发现是网络边界防护规则和 ARP 广播问题。

解决方案:

  1. 网络边界防护放行:Keepalived 使用 VRRP 协议(IP 协议号 112),需要在网络边界防护中放行。执行:
    firewall-cmd --add-rich-rule='rule protocol value="112" accept' --permanent
    firewall-cmd --reload
  2. ARP 问题:当 VIP 漂移后,某些交换机或客户端可能还缓存了旧的 MAC 地址。可以在 Keepalived 设置中添加 garp_master_delaygarp_master_refresh 参数,强制发送免费 ARP 刷新缓存。

六、总结与最佳实践

经过这一轮搭建和排坑,我总结了几个关键点:

  1. 检测脚本是灵魂:不要只写一个简单的 killall -0 nginx,要包含自动恢复逻辑,避免误切换。
  2. 优先级设计要合理:主备优先级差要大于 weight 值,否则可能出现“脑裂”或反复切换。
  3. 网络层要打通:网络边界防护、交换机设置要提前规划,VRRP 协议必须放行。
  4. 日志是排坑利器:遇到问题先看 /var/log/messages,Keepalived 的日志非常详细。

最后,Keepalived 虽然经典,但并非万能。如果你的业务对数据一致性要求极高,或者需要跨机房容灾,建议结合 DNS 负载均衡或云原生方案。但对于大多数内部服务的高可用需求,Keepalived + Nginx 这套组合,依然是最简单、最可靠的方案之一。

希望这篇“排坑记”能帮你顺利搭建起自己的高可用集群。运维路上,坑多路远,但每填一个坑,都是一次成长。

👨‍💻 运维老兵经验:根据实际生产环境,以上步骤建议先在测试环境验证,并做好备份。参数值需根据服务器设置调整,不要盲目照搬。

如果喜欢,点个「在看」分享给朋友吧。

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  1. CONNECT:[ UseTime:0.000438s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000673s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000279s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000266s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000571s ]
  6. SELECT * FROM `set` [ RunTime:0.023427s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000891s ]
  8. SELECT * FROM `article` WHERE `id` = 491456 LIMIT 1 [ RunTime:0.002400s ]
  9. UPDATE `article` SET `lasttime` = 1783067987 WHERE `id` = 491456 [ RunTime:0.006818s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.003434s ]
  11. SELECT * FROM `article` WHERE `id` < 491456 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.012619s ]
  12. SELECT * FROM `article` WHERE `id` > 491456 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007713s ]
  13. SELECT * FROM `article` WHERE `id` < 491456 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.067028s ]
  14. SELECT * FROM `article` WHERE `id` < 491456 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012329s ]
  15. SELECT * FROM `article` WHERE `id` < 491456 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.055287s ]
0.261254s