页首自改代码

Hey, Nice to meet You.  why ?

☆☆☆所谓豪杰之士,必有过人之节.人情有所不能忍者,匹夫见辱,拔剑而起,挺身而斗,此不足为勇也,天下有大勇者,猝然临之而不惊,无故加之而不怒.此其所挟持者甚大,而其志甚远也.          
返回顶部

Keepalived

目录

1.    基础掌握    1

1.1    服务安装    1

1.2    启动说明    1

1.3    配置说明    1

2.    高可用单实例    3

2.1    功能实现    3

2.2    功能测试    4

3.    双实例双主模式    4

 

  1. 基础掌握

  2. 服务安装

    # yum -y install keepalived

    # rpm -qa keepalived

    keepalived-1.2.13-7.el7.x86_64

  3. 启动说明

    # systemctl start keepalived.service

    # ps -ef |grep keep|grep -v grep

    root 11959 1 0 05:21 ? 00:00:00 /usr/sbin/keepalived -D

    root 11961 11959 0 05:21 ? 00:00:00 /usr/sbin/keepalived -D

    root 11962 11959 0 05:21 ? 00:00:00 /usr/sbin/keepalived -D

    提示:启动后有3个keepalived进程表示安装正确

    # ip a |grep 192.168.200

    inet 192.168.200.16/32 scope global eth0

    inet 192.168.200.17/32 scope global eth0

    inet 192.168.200.18/32 scope global eth0

    提示:默认情况下启动三个VIP地址

  4. 配置说明

    global_defs { #全局配置

       notification_email { #通知邮件的收件人

         root@localhost #收件人邮箱

         failover@firewall.loc #收件人邮箱

         sysadmin@firewall.loc #收件人邮箱

       }

       notification_email_from sendmail@local.loc #通知邮件的发件人邮箱

       smtp_server 127.0.0.1 #邮件服务器地址 

       smtp_connect_timeout 30 #和邮件服务器连接的超时时间

       router_id LVS_DEVEL #路由器标识

    }

    vrrp_instance VI_1 { #虚拟路由的标识符

        state MASTER #状态为主节点

        interface eth0 #通信所使用的网络接口

        virtual_router_id 51 #虚拟路由的ID号,是虚拟路由MAC的最后一位地址

        priority 100 #此节点的优先级,主节点的优先级需要比其他节点高

        advert_int 1 #通告的间隔时间

        authentication { #认证配置

            auth_type PASS #认证机制,默认是明文

            auth_pass 1111 #随机字符串

        }

        virtual_ipaddress { #虚拟IP地址,VIP

            192.168.200.16

            192.168.200.17

            192.168.200.18

        }

    virtual_server 192.168.200.100 443 { #集群所使用的VIP和端口

        delay_loop 6 #

        lb_algo rr #使用的负载均衡算法

        lb_kind NAT #类型

        nat_mask 255.255.255.0 #VIP掩码

        persistence_timeout 50 #持久连接时间

        protocol TCP #使用的协议

        real_server 192.168.201.100 443 { #节点服务器使用的IP及端口

            weight 1 #权重

            HTTP_GET { #健康检测方式,可选有 SSL_GETTCP_CHECK

                url { #基于url检查

                  path / #检查的url路径

                  digest ff20ad2481f97b1754ef3e12ecd3a9cc #需要检查到的内容

      status_code 200 #需要返回的状态码

                }

                url {

                  path /mrtg/

                  digest 9b3a0c85a887a256d6939da88aabd8cd

                }

                connect_timeout 3 #连接超时时间

                nb_get_retry 3 #检测尝试几次

                delay_before_retry 3 #检测的时间间隔

            }

       

        }

    }

  5. 高可用单实例

  6. 功能实现

    [root@lb01 ~]# cat /etc/keepalived/keepalived.conf

    ! Configuration File for keepalived

     

    global_defs {

    notification_email {

    1668759118-@qq.com

    }

    notification_email_from Alexandre.Cassen@firewall.loc

    smtp_server 192.168.200.1

    smtp_connect_timeout 30

    router_id lb01

    }

     

    vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 51

    priority 150

    advert_int 1

    authentication {

    auth_type PASS

    auth_pass 1111

    }

    virtual_ipaddress {

    192.168.10.88/24 dev eth0 label eth0:1

    }

    }

    [root@lb01 ~]# systemctl stop keepalived.service

    [root@lb01 ~]# systemctl start keepalived.service

    [root@lb01 ~]# ip a |grep 88

    inet 192.168.10.88/24 scope global secondary eth0:1

    提示:出现vip88表示lb01的keepalived服务单实例配置成功;

     

    [root@lb02 ~]# cat /etc/keepalived/keepalived.conf

    ! Configuration File for keepalived

     

    global_defs {

    notification_email {

    1668759118-@qq.com

    }

    notification_email_from Alexandre.Cassen@firewall.loc

    smtp_server 192.168.200.1

    smtp_connect_timeout 30

    router_id lb02

    }

     

    vrrp_instance VI_1 {

    state BACKUP

    interface eth0

    virtual_router_id 51

    priority 100

    advert_int 1

    authentication {

    auth_type PASS

    auth_pass 1111

    }

    virtual_ipaddress {

    192.168.10.88/24 dev eth0 label eth0:1

    }

    }

    [root@lb02 ~]# systemctl stop keepalived.service

    [root@lb02 ~]# systemctl start keepalived.service

    [root@lb02 ~]# ip a |grep 88

    提示:无任何结果返回表示lb02单实例配置成功,因为lb02是备节点,主节点存在时,不接管VIP;

     

    申明

        当主备节点同时出现VIP,说明高可用出现了脑裂现象(由于某些原因致两台服务器在指定时间内无法互相检测到对方心跳信息,则各自取的资源及服务器的所有权,将导致同一个ip存在两台服务器上而发生冲突),排查方向:

    + 主备服务器通信是否正常(iptables、SELinux);

    + 配置文件是否错误;特别注意virtual_router_id配置是否不一致;

  7. 功能测试

    停止主服务器Keepalived服务或关闭服务器,可在备服务器上看到vip的出现,当主服务器恢复正常时,vip从备服务器转移回主服务器。

  8. 双实例双主模式

    环境:

    lb1 192.168.10.12

    lb2 192.168.10.13

    vip1 192.168.10.88

    vip2 192.168.10.99

     

        以下是双主模式配置文件,vip1在lb1上为主,lb2上为从;vip2在lb1上为从,lb2上为主,当某台服务器上keepalived出现异常,2个vip将自动跳转至同一台服务器;

    [root@lb1 ~]# cat /etc/keepalived/keepalived.conf

    ! Configuration File for keepalived

     

    global_defs {

    notification_email {

    acassen@firewall.loc

    failover@firewall.loc

    sysadmin@firewall.loc

    }

    notification_email_from Alexandre.Cassen@firewall.loc

    smtp_server 192.168.200.1

    smtp_connect_timeout 30

    router_id LVS_DEVEL

    }

     

    vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 55

    priority 150

    advert_int 1

    authentication {

    auth_type PASS

    auth_pass 1111

    }

    virtual_ipaddress {

            192.168.10.88/24 dev eth0 label eth0:1

    }

    }

     

    vrrp_instance VI_2 {

    state BACKUP

    interface eth0

    virtual_router_id 56

    priority 100

    advert_int 1

    authentication {

    auth_type PASS

    auth_pass 1111

    }

    virtual_ipaddress {

            192.168.10.99/24 dev eth0 label eth0:2

    }

    }

    [root@lb2 ~]# cat /etc/keepalived/keepalived.conf

    ! Configuration File for keepalived

     

    global_defs {

    notification_email {

    acassen@firewall.loc

    failover@firewall.loc

    sysadmin@firewall.loc

    }

    notification_email_from Alexandre.Cassen@firewall.loc

    smtp_server 192.168.200.1

    smtp_connect_timeout 30

    router_id LVS_DEVEL

    }

     

    vrrp_instance VI_1 {

    state BACKUP

    interface eth0

    virtual_router_id 55

    priority 100

    advert_int 1

    authentication {

    auth_type PASS

    auth_pass 1111

    }

    virtual_ipaddress {

            192.168.10.88/24 dev eth0 label eth0:1

    }

    }

     

    vrrp_instance VI_2 {

    state MASTER

    interface eth0

    virtual_router_id 56

    priority 150

    advert_int 1

    authentication {

    auth_type PASS

    auth_pass 1111

    }

    virtual_ipaddress {

            192.168.10.99/24 dev eth0 label eth0:2

    }

    }

posted on 2017-12-25 14:00  罗穆瑞  阅读(296)  评论(0编辑  收藏  举报

导航