配置Keepalived

操作步骤

后台执行以下命令，修改/etc/keepalived/keepalived.conf文件，配置LVS主节点keepalived。

vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived
 
global_defs {
    router_id master_node
}
 
local_address_group laddr_gl {
    192.168.0.157  # LVS主节点地址
}
 
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 {
        192.168.0.27
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
}
 
# 虚拟ip 端口
virtual_server 192.168.0.27 80 { 
    delay_loop 6
    lb_algo rr
    lb_kind FNAT
    protocol TCP
    laddr_group_name laddr_gl
#后端服务节点
    real_server 192.168.0.3 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 15
            connect_port 80
            nb_get_retry 5
            delay_before_retry 3
        }
    }
    real_server 192.168.0.46 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 15
            connect_port 80
            nb_get_retry 5
            delay_before_retry 3
        }
    }
}

后台执行以下命令，修改/etc/keepalived/keepalived.conf文件，配置LVS备节点keepalived。

vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived
 
global_defs {
    router_id master_node
}
 
local_address_group laddr_gl {
    192.168.0.234  #本机地址
}
 
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id   51
    priority 99  # 需要比主节点低
    advert_int   1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.0.27
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
}
 
virtual_server 192.168.0.27 80 {
    delay_loop 6
    lb_algo rr
    lb_kind FNAT
    protocol TCP
    laddr_group_name laddr_gl
    real_server 192.168.0.3 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 15
            connect_port 80
            nb_get_retry 5
            delay_before_retry 3
        }
    }
    real_server 192.168.0.46 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 15
            connect_port 80
            nb_get_retry 5
            delay_before_retry 3
        }
    }
}

步骤3~6，主备LVS节点均需执行。

后台执行以下命令，修改/etc/keepalived/notify.sh文件。

vi /etc/keepalived/notify.sh

#!/bin/bash
 
if [ $# -eq 0 ]
then
    echo "input master/backup"
    exit 1
fi
 
case $1 in
master)
        sed -i "s/#laddr_group_name/laddr_group_name/" /etc/keepalived/keepalived.conf 2>/dev/null
        systemctl reload keepalived.service
;;
backup)
        if [ `grep "#laddr_group_name" /etc/keepalived/keepalived.conf|wc -l` -eq 0 ]
        then
            sed -i "s/laddr_group_name/#laddr_group_name/" /etc/keepalived/keepalived.conf 2>/dev/null
            systemctl reload keepalived.service
        fi
;;
esac

chmod +x /etc/keepalived/notify.sh