一、Keepalived简介
Keepalived是Linux下一个轻量级别的高可用解决方案，部署和使用简单，主要用途是对其他服务和本身状态监控。
二、keepalived 特点
- 服务故障转移，主备容灾
- 可实现ip漂移，简单的集群高可用
- 心跳检测，监控nginx,mysql, redis等服务挂掉后，尝试重启
三、keepalived 安装部署
- yum -y install openssl openssl-devel # 待找依赖包下载
- wget /software/keepalived-0.
- tar -zxvf ......
- cd keepalived-2.0.20
- ./configure --prefix=/usr/local/keepalived-2.0.20
- make && make install
- mkdir -p /etc/keepalived
- cp /usr/local/keepalived-2.0.20/etc/keepalived/ /etc/keepalived/
- ln -s /usr/local/keepalived-2.0.20/sbin/keepalived /usr/bin/
- 配置
- systemctl restart keepalived
- systemctl enable keepalived
四、Keepalived配置及说明
! Configuration File for keepalived
#global_defs {
#notification_email {
#root@localhost
#}
#notification_email_from keepalived@localhost #定义来信人
#smtp_server 127.0.0.1
#smtp_connect_timeout 30
#router_id node-00
#vrrp_mcast_group4 224.0.38.12
#}
vrrp_script check_nginx {
script "/data/sh/check_nginx.sh"
interval 2
weight -20
}
vrrp_instance VI_1 {
state MASTER # 其余服务器配置BACKUP
interface eth0 # 需要通信的ip所在的网卡
virtual_router_id 38 # 当前虚拟路由器的惟一标识，范围是0-255；同一虚拟ip下该值要一致。
priority 100 # 当前主机在此虚拟路径器中的优先级；范围1-254；该值用于多服务器选主。
nopreempt # 定义工作模式为非抢占模式 ；如果想使用非抢占模式，主从节点的state 都要设置为BACKUP；
advert_int 1 # vrrp通告的时间间隔；
authentication {
auth_type PASS
auth_pass x1er44q
}
track_script {
check_nginx
#check_redis
}
virtual_ipaddress {
172.16.104.69 dev eth1 # v-ip, 把vip绑定到指定网卡上。
}
virtual_routes {
default via 172.16.1.1 # 指定网关。
}
#smtp_alert #状态切换，使用邮件通知
}