Keepalive高可用 漂移

2017-09-10 14:04 出处:segmentfault 人气: 评论(0

博文参考

http://lanlian.blog.51cto.com/6790106/1303195/
http://blog.csdn.net/tantexian/article/details/50056229
http://www.yulongjun.com/linux/20170904-01-keepalived-introduction/

Keepalived简介

keepalived

基于VRRP协议来实现的LVS服务高可用方案,可以利用其来避免单点故障。一个LVS服务会有2台服务器运行Keepalived,一台为主服务器(MASTER),一台为备份服务器(BACKUP),但是对外表现为一个虚拟IP,主服务器会发送特定的消息给备份服务器,当备份服务器收不到这个消息的时候,即主服务器宕机的时候, 备份服务器就会接管虚拟IP,继续提供服务,从而保证了高可用性。Keepalived是VRRP的完美实现。

启动后三个进程

父进程:内存管理,子进程管理等等
子进程:VRRP子进程
子进程:healthchecker子进程

VRRP协议简介

VRRP全称Virtual Router Redundancy Protocol,即虚拟路由冗余协议。
    虚拟路由冗余协议,可以认为是实现路由器高可用的协议,即将N台提供相同功能的路由器组成一个路由器组,这个组里面有一个master和多个backup,master上面有一个对外提供服务的vip(该路由器所在局域网内其他机器的默认路由为该vip),master会发组播,当backup收不到vrrp包时就认为master宕掉了,这时就需要根据VRRP的优先级来选举一个backup当master。这样的话就可以保证路由器的高可用了。于安全性考虑,VRRP包使用了加密协议进行加密。

keepalived配置介绍

keepalived只有一个配置文件keepalived.conf,里面主要包括以下几个配置区域:

  • global_defs主要是配置故障发生时的通知对象以及机器标识

  • static_ipaddress和static_routes区域配置的是是本节点的IP和路由信息

  • vrrp_script用来做健康检查的,当时检查失败时会将vrrp_instancepriority减少相应的值

  • vrrp_instance用来定义对外提供服务的VIP区域及其相关属性

  • vrrp_rsync_group用来定义vrrp_intance组,使得这个组内成员动作一致

全局配置

全局配置又包括两个子配置:
全局定义(global definition)
静态路由配置(static ipaddress/routes)

VRRPD配置

VRRPD配置包括三个类:
VRRP同步组(synchroization group)
VRRP实例(VRRP Instance)
VRRP脚本

keepalived单活双活配置

单活配置

/etc/keepalived/keepalived.conf

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka1@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka1
   vrrp_mcast_group4 224.111.111.111
}
vrrp_instance VG_1 {
    state MASTER
    interface eth2
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 0702f7ab
    }
    virtual_ipaddress {
        192.168.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"          
}

/etc/keepalived/keepalived.conf

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka1@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka1
   vrrp_mcast_group4 224.111.111.111
}
vrrp_instance VG_1 {
    state BACKUP
    interface eth2
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 0702f7ab
    }
    virtual_ipaddress {
        192.168.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"          
}

双活配置

/etc/keepalived/keepalived.conf

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka1@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka1
   vrrp_mcast_group4 224.111.111.111
}
vrrp_instance VG_1 {
    state MASTER
    interface eth2
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 0702f7ab
    }
    virtual_ipaddress {
        192.168.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"          
}
vrrp_instance VG_2 {
    state BACKUP
    interface eth2
    virtual_router_id 192
    priority 95
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 85c9a27b
    }
    virtual_ipaddress {
        192.168.111.200
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"          
}

/etc/keepalived/keepalived.conf

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka1@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka1
   vrrp_mcast_group4 224.111.111.111
}
vrrp_instance VG_1 {
    state BACKUP
    interface eth2
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 0702f7ab
    }
    virtual_ipaddress {
        192.168.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"  
}
vrrp_instance VG_2 {
    state MASTER
    interface eth2
    virtual_router_id 192
    priority 95
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 85c9a27b
    }
    virtual_ipaddress {
        192.168.111.200
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}

内外双网络(非同步)单活模式漂移配置

一个内网网络,一个外网网络,内网网络和外网网络不用同步漂移,比如Keepalived+LVS-DR、Keepalived+Nginx、Keepalived+HAProxy,都是不用同步漂移的。(Keepalived+LVS-NAT是需要同步漂移的。)

/etc/keepalived/keepalived.conf

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka1@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka1
   vrrp_mcast_group4 224.111.111.111
}
vrrp_sync_group VG_1 {
    group {
        External_1
        Internal_1
    }
}
vrrp_instance External_1 {
    state MASTER
    interface eth1
    virtual_router_id 171
    priority 100
    advert_int 1    
    authentication {
        auth_type PASS
        auth_pass 1402b1b5
    }
    virtual_ipaddress {
        172.16.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance Internal_1 {
    state MASTER
    interface eth2
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 0702f7ab
    }
    virtual_ipaddress {
        192.168.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}

/etc/keepalived/keepalived.conf

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka1@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka1
   vrrp_mcast_group4 224.111.111.111
}
vrrp_instance External_1 {
    state BACKUP
    interface eth1
    virtual_router_id 171
    priority 100
    advert_int 1    
    authentication {
        auth_type PASS
        auth_pass 1402b1b5
    }
    virtual_ipaddress {
        172.16.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance Internal_1 {
    state BACKUP
    interface eth2
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 0702f7ab
    }
    virtual_ipaddress {
        192.168.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}

内外双网络(同步)双活模式漂移配置

一个内网网络,一个外网网络,而且内网网络和外网网络要实现同步漂移,比如Keepalived+LVS-NAT模式,那么就用到vrrp_sync_group来设置同步漂移组,如果要做双活,那么就分别两端加两个vip,互为主备。

/etc/keepalived/keepalived.conf

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka1@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka1
   vrrp_mcast_group4 224.111.111.111
}
vrrp_sync_group VG_1 {
    group {
        External_1
        Internal_1
    }
}
vrrp_sync_group VG_2 {
    group {
        External_2
        Internal_2
    }
}
vrrp_instance External_1 {
    state MASTER
    interface eth1
    virtual_router_id 171
    priority 100
    advert_int 1    
    authentication {
        auth_type PASS
        auth_pass 1402b1b5
    }
    virtual_ipaddress {
        172.16.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance External_2 {
    state BACKUP
    interface eth1
    virtual_router_id 172
    priority 95
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 9d3d15d5
    }
    virtual_ipaddress {
        172.16.111.200
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance Internal_1 {
    state MASTER
    interface eth2
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 0702f7ab
    }
    virtual_ipaddress {
        192.168.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance Internal_2 {
    state BACKUP
    interface eth2
    virtual_router_id 192
    priority 95
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 85c9a27b
    }
    virtual_ipaddress {
        192.168.111.200
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}

/etc/keepalived/keepalived.conf

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka1@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka1
   vrrp_mcast_group4 224.111.111.111
}
vrrp_sync_group VG_1 {
    group {
        External_1
        Internal_1
    }
}
vrrp_sync_group VG_2 {
    group {
        External_2
        Internal_2
    }
}
vrrp_instance External_1 {
    state BACKUP
    interface eth1
    virtual_router_id 171
    priority 100
    advert_int 1    
    authentication {
        auth_type PASS
        auth_pass 1402b1b5
    }
    virtual_ipaddress {
        172.16.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance External_2 {
    state MASTER
    interface eth1
    virtual_router_id 172
    priority 95
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 9d3d15d5
    }
    virtual_ipaddress {
        172.16.111.200
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance Internal_1 {
    state BACKUP
    interface eth2
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 0702f7ab
    }
    virtual_ipaddress {
        192.168.111.100
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance Internal_2 {
    state MASTER
    interface eth2
    virtual_router_id 192
    priority 95
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 85c9a27b
    }
    virtual_ipaddress {
        192.168.111.200
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
本文标签: mysql负载均衡tomcatnginx

相关文章

网站内容来源于互联网,仅供用于技术学习,请遵循相关法律 规,如有侵权,请联系管理员删除

Copyright © 2002-2017 JISHUX. 技术栈 版权所有

京ICP备15061484号-3