Software L4 Config¶

1. HA software install¶

1.1 Keepalived install (@all node)

apt update && apt install -y keepalived

2. HAProxy config¶

2.1 Create keepalived config file

vim /etc/keepalived/keepalived.conf

Add below content (every node)

vrrp_instance VI_1 {
    state MASTER           # 主节点为MASTER，备节点为BACKUP
    interface eth0         # 网卡名称
    virtual_router_id 111  # VRRP 路由id, 所有节点保持一致
    priority 100           # 主节点优先级高于备节点（如101/100/99）
    advert_int 1           # 通信心跳周期，单位是秒
    authentication {
        auth_type PASS
        auth_pass 111      # 认证密码，所有节点必须一致
    }
    virtual_ipaddress {
        10.41.8.110/24    # 虚拟 IP 地址 (VIP)
    }
}

2.2 Start keepalived

systemctl --now enable keepalived

2.3 Enable IP forward

nano /etc/sysctl.conf

Add below content

net.ipv4.ip_forward = 1
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.send_redirects = 0

Apply config

sysctl -p