keepalived双主模式（互为主备）

考虑到keepalived高可用，备节点的机器基本上属于空闲状态，很浪费硬件资源，所以我们可以让keepalived互为主备，跑多个实例

第一个节点配置
vim /etc/keepalived/keepalived.conf

global_defs {
    router_id LVS_KEEP01                                       
}
#第一个业务 为主
vrrp_instance VI_1 {                                          
    state MASTER                                              
    interface eth0
	lvs_sync_daemon_inteface eth0                            
    virtual_router_id 51                                      
    priority 150                                              
    advert_int 1                                              
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {                                       
        10.125.192.100
        10.125.192.101
    }
}

virtual_server 10.125.192.100 80 {                            
    delay_loop 6                                              
    lb_algo wrr                                               
    lb_kind DR                                                
    nat_mask 255.255.255.0
    persistence_timeout 10                                    
    protocol TCP

    real_server 10.125.192.2 80 {
        weight 1                                              
		inhibit_on_failure                                  
        TCP_CHECK {                                           
        connect_timeout 8                                    
        nb_get_retry 3                                        
        delay_before_retry 3                                  
        connect_port 80                                       
        }
    }
    real_server 10.125.192.3 80 {
        weight 1
		inhibit_on_failure                                    
        TCP_CHECK {
        connect_timeout 8
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
}
#第二个业务为备
vrrp_instance VI_2 {                                          
    state BACKUP
    interface eth0
	lvs_sync_daemon_inteface eth0                            
    virtual_router_id 52                                    
    priority 100                                              
    advert_int 1                                              
    authentication {
        auth_type PASS
        auth_pass 2222
    }
    virtual_ipaddress {                                       
        10.125.192.102
        10.125.192.103
    }
}

virtual_server 10.125.192.102 80 {                            
    delay_loop 6                                              
    lb_algo wrr                                               
    lb_kind DR                                                
    nat_mask 255.255.255.0
    persistence_timeout 10                                    
    protocol TCP

    real_server 10.125.192.5 80 {
        weight 1                                              
		inhibit_on_failure                                  
        TCP_CHECK {                                           
        connect_timeout 8                                    
        nb_get_retry 3                                        
        delay_before_retry 3                                  
        connect_port 80                                       
        }
    }
    real_server 10.125.192.6 80 {
        weight 1
		inhibit_on_failure                                    
        TCP_CHECK {
        connect_timeout 8
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
}

第二个节点配置
vim /etc/keepalived/keepalived.conf

global_defs {
     router_id LVS_KEEP01                                       
}
#第一个业务 为备
vrrp_instance VI_1 {                                          
    state BACKUP
    interface eth0
	lvs_sync_daemon_inteface eth0                            
    virtual_router_id 51                                      
    priority 100                                              
    advert_int 1                                              
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {                                       
        10.125.192.100
        10.125.192.101
    }
}

virtual_server 10.125.192.100 80 {                            
    delay_loop 6                                              
    lb_algo wrr                                               
    lb_kind DR                                                
    nat_mask 255.255.255.0
    persistence_timeout 10                                    
    protocol TCP

    real_server 10.125.192.2 80 {
        weight 1                                              
		inhibit_on_failure                                  
        TCP_CHECK {                                           
        connect_timeout 8                                    
        nb_get_retry 3                                        
        delay_before_retry 3                                  
        connect_port 80                                       
        }
    }
    real_server 10.125.192.3 80 {
        weight 1
		inhibit_on_failure                                    
        TCP_CHECK {
        connect_timeout 8
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
}
#第二个业务为主
vrrp_instance VI_2 {                                          
    state MASTER
    interface eth0
	lvs_sync_daemon_inteface eth0                            
    virtual_router_id 52                                    
    priority 150                                              
    advert_int 1                                              
    authentication {
        auth_type PASS
        auth_pass 2222
    }
    virtual_ipaddress {                                       
        10.125.192.102
        10.125.192.103
    }
}

virtual_server 10.125.192.102 80 {                            
    delay_loop 6                                              
    lb_algo wrr                                               
    lb_kind DR                                                
    nat_mask 255.255.255.0
    persistence_timeout 10                                    
    protocol TCP

    real_server 10.125.192.5 80 {
        weight 1                                              
		inhibit_on_failure                                  
        TCP_CHECK {                                           
        connect_timeout 8                                    
        nb_get_retry 3                                        
        delay_before_retry 3                                  
        connect_port 80                                       
        }
    }
    real_server 10.125.192.6 80 {
        weight 1
		inhibit_on_failure                                    
        TCP_CHECK {
        connect_timeout 8
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
}