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Keepalived高可用群集
Keepalived high availability cluster
Keepalived采用VRRP热备份协议，以软件的方式实现linux服务器的多机热备功能，当一方故障时，自动切换备份服务器进行工作。
Keepalived uses VRRP hot backup protocol to realize the multi machine hot backup function of Linux server in the way of software. When one party fails, it will automatically switch the backup server to work.
Keepalived部署环境：一台主调度服务器，一台从调度服务器，多台节点服务器
Maintained deployment environment: one master scheduling server, one slave scheduling server, and multiple node servers
Keepalived部署步骤：
Steps of maintained deployment:
v 安装支持组件
V. install support components
#yum -y install kernel-devel openssl-devel popt-devel ipvsadm
#yum -y install kernel-devel openssl-devel popt-devel ipvsadm
v 源码安装keepalived工具
V. source code installation keepalived tool
#tar xzvf keepalived-1.2.13.tar.gz
#tar xzvf keepalived-1.2.13.tar.gz
#cd keepalived-1.2.13
#cd keepalived-1.2.13
#./configure --prefix=/ --with-kernel-dir=/usr/src/kernels/2.6.32-431.e16.x86_64
#./configure --prefix=/ --with-kernel-dir=/usr/src/kernels/2.6.32-431.e16.x86_64
#make make install
#make make install
v 配置主调度器
V. configure the main modulator
#vim /etc/keepalived/keepalived.conf
#vim /etc/keepalived/keepalived.conf
修改相关内容：
Modify relevant contents:
global_defs {
global_defs {
router_id R1 主调度器的名称
Router Ou ID R1 name of primary register
}
}
vrrp_instance VI_1 {
vrrp_instance VI_1 {
state MASTER 主调度器的热备状态
State master the hot standby state of the primary register
interface eth0 主调度器的下接口
Interface eth0 the lower interface of the main scheduler
virtual_router_id 1 组号
Virtual router ID 1 group number
priority 100 优先级
Priority 100
advert_int 1
advert_int 1
authentication { 主从热备认证信息
Authentication {master-slave hot standby authentication information
auth_type PASS
auth_type PASS
auth_pass 1111
auth_pass 1111
}
}
virtual_ipaddress { 群集虚拟IP地址
Virtual IP address {cluster virtual IP address
1.1.1.100
1.1.1.100
}
}
virtual_server 1.1.1.100 80 { 虚拟服务地址端口
Virtual server 1.1.1.100 80 {virtual service address port
delay_loop 6 健康检查的间隔时间
Delay? Loop 6 interval between health checks
lb_algo rr 轮询的调度算法
The scheduling algorithm of lb'algo RR polling
lb_kind DR 直接路由的群集工作模式
The cluster working mode of LB · kind Dr direct routing
! persistence_timeout 50 保持时间
! persistence > timeout 50
protocol TCP 协议
Protocol TCP protocol
real_server 1.1.1.1 80 { 真实服务器地址端口
Real server 1.1.1.1 80 {real server address port
weight 1 权重
Weight 1
TCP_CHECK { 健康检查方式
TCP? Check {health check method
connect_port 80 检查目标端口
Connect? Port 80 check target port
connect_timeout 3 连接超时
Connect? Timeout 3
nb_get_retry 3 重试次数
NB get retry 3
delay_before_retry 3 重试间隔
Delay? Before? Retry 3 retry interval
}
}
}
}
}
}
v 重启keepalived服务
V. restart the maintained service
#Service keepalived restart
#Service keepalived restart
v 验证配置文件是否生效
V. verify that the configuration file is valid
#ip addr 查看是否自动创建了虚拟群集IP
#IP addr to check whether the virtual cluster IP is created automatically
v 配置从调度器
V. configure slave scheduler
#vim /etc/keepalived/keepalived.conf
#vim /etc/keepalived/keepalived.conf
修改内容：
Modification:
global_defs {
global_defs {
router_id R2 从调度器的名称
Router ﹣ ID R2 name of slave scheduler
}
}
vrrp_instance VI_1 {
vrrp_instance VI_1 {
state BACKUP 从调度器的热备状态
State backup hot standby state of slave dispatcher
interface eth0 从调度器的下接口
Interface eth0 from the lower interface of the scheduler
virtual_router_id 1 组号
Virtual router ID 1 group number
priority 99 优先级
Priority 99
........其他内容相同
Other contents are the same
v 重启keepalived服务
V. restart the maintained service
#Service keepalived restart
#Service keepalived restart
v 配置节点服务器
V. configure node servers
#ifconfig lo:0 1.1.1.100/32
#ifconfig lo:0 1.1.1.100/32
#route add -host 1.1.1.100 dev lo:0
#route add -host 1.1.1.100 dev lo:0
#vim /etc/sysctl.conf
#vim /etc/sysctl.conf
添加内容：
Add content:
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.default.arp_announce = 2
#sysctl -p
#sysctl -p
--------------------------------------------------------------
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