Keepalived安装部署
安装keepalived
yum 安装keepalived
yum install keepalived
keepalived.conf配置文件进行调整，其中state设置主备状态，interface设置对应网络接口类型，priority设置优先级，备节点数字小于master节点，数字越大优先级越高。virtual_ipaddress设置虚拟IP地址，track_script设置读取检查脚本的方法，在方法中配置对应脚本位置。
主节点cdp01修改配置文件keepalived.conf为
! Configuration File for keepalived
global_defs {
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 60
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
check_haproxy
}
virtual_ipaddress {
10.60.1.21/32
}
}
vrrp_script check_haproxy {
script "/etc/keepalived/haproxy_check.sh"
interval 2
}备节点cdp02修改配置文件keepalived.conf为
! Configuration File for keepalived
global_defs {
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 60
priority 50
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
check_haproxy
}
virtual_ipaddress {
10.60.1.21/32
}
}
vrrp_script check_haproxy {
script "/etc/keepalived/haproxy_check.sh"
interval 2
}设置haproxy检查脚本haproxy_check.sh,赋予可执行权限
#!/bin/bash HAPROXY_STATUS=`ps -C haproxy --no-header | wc -l` if [[ $HAPROXY_STATUS -eq 0 ]];then date >> /etc/keepalived/haproxy_check.log echo "haproxy is not running" >> /etc/keepalived/haproxy_check.log exit 1 fi
keepalived设置开机自启
systemctl enable keepalived systemctl start keepalived systemctl status keepalived
最终keepalived配置文件为
主节点
! Configuration File for keepalived
global_defs {
script_user root
}
vrrp_script chk_haproxy {
script "/etc/keepalived/haproxy_check.sh"
interval 2
user root
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 60
priority 100
# nopreempt #不抢占 ，back节点配置
advert_int 1
unicast_src_ip 10.60.1.1
unicast_peer {
10.168.54.100
}
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_haproxy
}
virtual_ipaddress {
10.60.1.21/32 dev eth0 label eth0:1
#10.168.54.105/32 dev eth0 label eth0:2
}
}备节点
! Configuration File for keepalived
global_defs {
script_user root
}
vrrp_script chk_haproxy {
script "/etc/keepalived/haproxy_check.sh"
interval 2
user root
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 60
priority 50
nopreempt
advert_int 1
unicast_src_ip 10.168.54.101
unicast_peer {
10.60.1.1
}
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_haproxy36,546%
}
virtual_ipaddress {
10.60.1.21/32
}
}Faq:
Q1：keepalived两个节点出现脑裂现象（双vip）
A：在配置文件中添加如下配置后，重启keepalived服务
unicast_src_ip 10.11.4.187 ##source ip
unicast_peer {
10.11.4.186 ##dest ip
}Q2：keepalived在haproxy挂掉之后无法进行VIP的切换
cdp01中的haproxy挂掉之后，cdp01中查看IP地址，VIP还存在于cdp01中。
A：修改配置文件为
因为原先用的默认用户keepalived_script，这个主机中没有该用户。替换成root，把脚本方法提上来，VIP可以正常切换。
