keepalived搭建

1.环境准备

主机	IP	身份
web01	172.16.1.7
web03	172.16.1.9
nfs	172.16.1.31
db01	172.16.1.51
lb01	172.16.1.4	master
lb02	172.16.1.5	backup
	10.0.0.3	VIP

2.保证两台七层负载配置一致

[root@lb01 ~]# scp /etc/nginx/conf.d/* 172.16.1.5:/etc/nginx/conf.d/

#访问测试
10.0.0.5 linux.blog.com
10.0.0.4 linux.blog.com

3.安装keepalived

[root@lb01 ~]# yum install -y keepalived
[root@lb02 ~]# yum install -y keepalived

4.配置keepalived主节点

#查找配置文件
[root@lb01 ~]# rpm -qc keepalived
/etc/keepalived/keepalived.conf

[root@lb01 ~]# vim /etc/keepalived/keepalived.conf
global_defs {                #全局配置
   router_id lb01            #身份识别（唯一）
}
vrrp_instance VI_1 {        #VRPP协议配置
    state MASTER            #告诉你一开始这台机器是主
    interface eth0            #绑定的网卡
    virtual_router_id 51    #虚拟路由标识，就是编组，将master和backup分为一组                            
    priority 100            #优先级（真正判断是主还是备的条件）
    advert_int 1            #检测心跳的时间间隔     
    authentication {        #认证相关
        auth_type PASS        #以密码的形式认证
        auth_pass 1111        #密码
    }
    virtual_ipaddress {        #指定VIP地址
        10.0.0.3
    }   
}

[root@lb01 ~]# vim /etc/keepalived/keepalived.conf
global_defs {
   router_id lb01
}
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.0.0.3
    }   
}

5.配置keepalived备节点

[root@lb02 ~]# vim /etc/keepalived/keepalived.conf 
global_defs {
   router_id lb02
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.0.0.3
    }
}

6.主备节点配置区别

区别	master主节点	backup备节点
router_id（唯一标识符）	lb01	lb02
state（角色状态）	MASTER	BACKUP
priority（优先级）	100	90

7.启动服务

[root@lb02 ~]# systemctl start keepalived.service
[root@lb02 ~]# tail -f /var/log/messages

[root@lb01 ~]# systemctl start keepalived.service
[root@lb02 ~]# tail -f /var/log/messages

8.配置keepalived日志

#配置keepalived
[root@lb02 ~]# vim /etc/sysconfig/keepalived
KEEPALIVED_OPTIONS="-D -d -S 0"

#配置rsyslog
[root@lb02 ~]# vim /etc/rsyslog.conf
local0.*               /var/log/keepalived.log

#重启服务
[root@lb02 ~]# systemctl restart rsyslog 
[root@lb02 ~]# systemctl restart keepalived

#查看日志
[root@lb02 ~]# tail -f /var/log/keepalived.log