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3-3 使用keepalived搭建高可用的LVS-DR集群

杰克逊爱学习 2022-02-09 阅读 47
ipadvimapacheLinux系统/运维

1.

主LVS服务器keepalived配置vim /etc/keepalived/keepalived.conf

global_defs {
    notification_email {
        root@localhost
    }   
    notification_email_from root@localhost
    smtp_server localhost
    smtp_connect_timeout 30
    router_id xuegod13
}
vrrp_instance apache {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100 
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }   
    virtual_ipaddress {
        192.168.31.111
    }   
}

virtual_server 192.168.31.111 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    protocol TCP 

    real_server 192.168.31.15 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }   
    }   
    real_server 192.168.31.16 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}

2.

备用分发器上的keepalived配置文件vim /etc/keepalived/keepalived.conf

global_defs {
    notification_email {
        root@localhost
    }   
    notification_email_from root@localhost
    smtp_server localhost
    smtp_connect_timeout 30
    router_id xuegod14
}
vrrp_instance apache {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }   
    virtual_ipaddress {
        192.168.31.111
    }   
}

virtual_server 192.168.31.111 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    protocol TCP 

    real_server 192.168.31.15 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }   
    }   
    real_server 192.168.31.16 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}

3.

在RS上设置临时VIP绑定

[root@xuegod16 ~]# vim /etc/init.d/lvsrsdr
#!/bin/bash
#description:start relserver
VIP=192.168.31.111
source /etc/init.d/functions
case $1 in
start)
    echo 'start LVS of Realserver DR'
    /sbin/ifconfig lo:1 $VIP broadcast $VIP netmask 255.255.255.255 up
    /sbin/route add -host $VIP dev lo:1
    echo '1' > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo '2' > /proc/sys/net/ipv4/conf/lo/arp_announce
    echo '1' > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo '2' > /proc/sys/net/ipv4/conf/all/arp_announce
    ;;  
stop)
    /sbin/ifconfig lo:1 down
    echo 'Close LVS of Realserver DR'
    echo '0' > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo '0' > /proc/sys/net/ipv4/conf/lo/arp_announce
    echo '0' > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo '0' > /proc/sys/net/ipv4/conf/all/arp_announce
    ;;  
*)
    echo "Usage:$0(start|stop)"
    exit 1
esac
[root@xuegod16 ~]# chmod +x /etc/init.d/lvsrsdr
[root@xuegod16 ~]# /etc/init.d/lvsrsdr start
Reloading systemd:                                         [  确定  ]
Starting lvsrsdr (via systemctl):                          [  确定  ]
[root@xuegod16 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet 192.168.31.111/32 brd 192.168.31.111 scope global lo:1
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default

4.

配置keepalived实现互为主从

思路：两主机各绑定下一个VIP，同时两台主机都为主服务向外提供一组资源，同时也是互为备用服务

13的主机配置：

[root@xuegod13 ~]# vim /etc/keepalived/keepalived.conf
global_defs {
    notification_email {
        root@localhost
    }
    notification_email_from root@localhost
    smtp_server localhost
    smtp_connect_timeout 30
    router_id xuegod13
}
vrrp_instance DR1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.31.111
    }
}

vrrp_instance DR2 {
    state BACKUP
    interface ens33
    virtual_router_id 53
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.31.113
    }
}

virtual_server 192.168.31.111 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    protocol TCP

    real_server 192.168.31.15 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
    real_server 192.168.31.16 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}
virtual_server 192.168.31.113 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    protocol TCP

    real_server 192.168.31.15 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
    real_server 192.168.31.16 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}

14主机的keepalived配置

[root@xuegod14 ~]# vim /etc/keepalived/keepalived.conf
global_defs {
    notification_email {
        root@localhost
    }
    notification_email_from root@localhost
    smtp_server localhost
    smtp_connect_timeout 30
    router_id xuegod14
}
vrrp_instance DR1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.31.111
    }
}

vrrp_instance DR2 {
    state MASTER
    interface ens33
    virtual_router_id 53
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.31.113
    }
}

virtual_server 192.168.31.111 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    protocol TCP

    real_server 192.168.31.15 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
    real_server 192.168.31.16 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}
virtual_server 192.168.31.113 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    protocol TCP

    real_server 192.168.31.15 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
    real_server 192.168.31.16 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}

5.

RS，需要新绑定下一个VIP

可以使用命令，也可以基于上面3的脚本文件，新添加一条绑定的命令，使用命令临时绑定方法如下：

[root@xuegod15 ~]# ifconfig lo:2 192.168.31.113 broadcast 192.168.31.113 netmask 255.255.255.255 up








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