keepalived搭建详解
################################# 1.安装兼容包###########################yum -y install openssl openssl-devel ipvsadm
################################2.下载并安装popt和keepalived####################
wget http://rpm5.org/files/popt/popt-1.14.tar.gz
tar popt-1.14.tar.gz
cd popt-1.14
./configuration
make && make install
wget http://www.keepalived.org/software/keepalived-1.2.20.tar.gz
tar zxvf keepalived-1.2.20.tar.gz
cd keepalived-1.2.20
./configuration
make && make install
###############################3.redis_master keepalived配置##################
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp /usr/local/sbin/keepalived /usr/sbin/
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
chkconfig --add keepalived
vi /etc/keepalived/keepalived.conf #redis master配置
配置MASTER 配置如下：
Configuration File for keepalived
global_defs {
notification_email {##指定keepalived在发生事件（如切换）需要发送Email的对象，多个写多行##
zhengxiaofeiccc@126.com
}
notification_email_from zhengxiaofeiccc@126.com ##发送人
smtp_server smtp.126.com ##SMTP服务器##
smtp_connect_timeout 30##链接超时时间##
router_id LVS_DEVEL ##路由标识，这里用主机名##
}
vrrp_instance VI_1 { ##虚拟路由标识##
state MASTER ##初始状态，默认，选举产生后才可以升级为Master ，这里明确定义其为Master##
interface eno16777736 ##选举通过那个网卡接口## 通过ifconfig查看
virtual_router_id 51 ##虚拟路由的ID号，一般不大于255，可选IP最后一段使用##
priority 100 ##初始优先级，选举过程中判断的依据，和路由的概念一样##
advert_int 1 ##检查间隔，默认1s##
authentication { ##认证机制##
auth_type PASS ##认证方式，PASS为明文##
auth_pass ipython ##认证密码##
}
virtual_ipaddress { ##虚拟地址池##
192.168.230.190
}
}
###后面的配置参数 先删删掉吧###
配置Backup 配置如下：
global_defs {
notification_email {##指定keepalived在发生事件（如切换）需要发送Email的对象，多个写多行##
zhengxiaofeiccc@126.com
}
notification_email_from zhengxiaofeiccc@126.com ##发送人
smtp_server smtp.126.com ##SMTP服务器##
smtp_connect_timeout 30##链接超时时间##
router_id LVS_DEVEL ##路由标识，这里用主机名##
}
vrrp_instance VI_1 {
state BACKUP
interface eno16777736
virtual_router_id 51
priority 50
advert_int 1
authentication {
auth_type PASS
auth_pass ipython
}
virtual_ipaddress {
192.168.230.190
}
}
###其他配置：####
nopreempt 设置为不抢占，这个配置只能设置在state为BACKUP的节点上，并且这个机器的优先级必须比另一台高
preempt_delay 抢占延迟，默认5分钟
debug debug级别
notify_master 切换到Master时执行的脚本
##start##
service keepalived start
Starting keepalived:
###观察其日志文件###
tail -f /var/log/messages
Aug3 00:02:12 Nginx-one Keepalived: Starting Keepalived v1.2.13 (08/03,2014)
Aug3 00:02:12 Nginx-one Keepalived: Starting Healthcheck child process, pid=8180
Aug3 00:02:12 Nginx-one Keepalived: Starting VRRP child process, pid=8181
####当前的IP地址####
Aug3 00:02:13 Nginx-one Keepalived_vrrp: Netlink reflector reports IP 192.168.230.128 added
Aug3 00:02:13 Nginx-one Keepalived_vrrp: Netlink reflector reports IP fe80::20c:29ff:fecb:90a2 added
Aug3 00:02:13 Nginx-one Keepalived_vrrp: Registering Kernel netlink reflector
Aug3 00:02:13 Nginx-one Keepalived_vrrp: Registering Kernel netlink command channel
Aug3 00:02:13 Nginx-one Keepalived_healthcheckers: Netlink reflector reports IP 1.1.1.10 added
Aug3 00:02:13 Nginx-one Keepalived_healthcheckers: Netlink reflector reports IP fe80::20c:29ff:fecb:90a2 added
Aug3 00:02:13 Nginx-one Keepalived_healthcheckers: Registering Kernel netlink reflector
Aug3 00:02:13 Nginx-one Keepalived_vrrp: Registering gratuitous ARP shared channel
Aug3 00:02:13 Nginx-one Keepalived_healthcheckers: Registering Kernel netlink command channel
Aug3 00:02:13 Nginx-one Keepalived_vrrp: Opening file '/etc/keepalived/keepalived.conf'.
Aug3 00:02:13 Nginx-one Keepalived_vrrp: Configuration is using : 62834 Bytes
Aug3 00:02:13 Nginx-one Keepalived_vrrp: Using LinkWatch kernel netlink reflector...
Aug3 00:02:13 Nginx-one Keepalived_vrrp: VRRP sockpool:
###打开并加载配置文件####
Aug3 00:02:13 Nginx-one Keepalived_healthcheckers: Opening file '/etc/keepalived/keepalived.conf'.
Aug3 00:02:13 Nginx-one Keepalived_healthcheckers: Configuration is using : 7377 Bytes
Aug3 00:02:13 Nginx-one Keepalived_healthcheckers: Using LinkWatch kernel netlink reflector...
####切换为Master 状态####
Aug3 00:02:14 Nginx-one Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
Aug3 00:02:15 Nginx-one Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
Aug3 00:02:15 Nginx-one Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.
####在接口上添加VIP###
Aug3 00:02:15 Nginx-one Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth1 for 192.168.230.190
Aug3 00:02:15 Nginx-one Keepalived_healthcheckers: Netlink reflector reports IP 1.1.1.100 added
Aug3 00:02:20 Nginx-one Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth1 for 192.168.230.190
###查看是否添加VIP###
ip a show|awk '/inet\ /'
inet 127.0.0.1/8 scope host lo
inet 1.1.1.10/8 brd 1.255.255.255 scope global eth1
inet 1.1.1.100/32 scope global eth1
停止MASTER，查看BACKUP的状态转移
service keepalived stop
Stopping keepalived:
####和路由协议一样，当MASTER上线被检测到会抢占VIP，可以想象的到，Keepalived也支持非抢占模式，只有BACKUP在变成MASTER后宕机了，才会转移VIP，说起来怎么这么绕口####
######################4.启动keepalived，并查看###########################################
service keepalived start
# ip a|grep inet
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
inet 192.168.230.128/24 brd 192.168.240.255 scope global eth0
inet 192.168.230.190/32 scope global eth0
inet6 fe80::250:56ff:fe98:6a56/64 scope link
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