zabbix监控脑裂
目录对脑裂的监控应在备用服务器上进行，通过添加zabbix自定义监控进行。
监控出现异常的两种状态：
- 正常情况下master主机nginx和keepalived为开启，backup主机keepalived为开启nginx为关闭，当master主机发生异常时backup主机通过脚本抢夺vip
- 当出现脑裂时主备的两台主机都会有vip
所以只需要监控备主机的网卡是否有vip就可以达到zabbix监控脑裂
备机上出现VIP有两种情况：
- 发生了脑裂
- 正常的主备切换
监控只是监控发生脑裂的可能性，不能保证一定是发生了脑裂，因为正常的主备切换VIP也是会到备上的。
在backup主机安装zabbix的客户端，在192.168.118.137主机安装zabbix服务端用于使用web网页管理监控
zabbix服务端部署参考zabbix介绍与部署
Keepalived配置里同一 VRRP实例如果 virtual_router_id两端参数配置不一致也会导致裂脑问题发生。
环境介绍
| 主机 | ip |
|---|---|
| master | 192.168.118.129 |
| backup | 192.168.118.128 |
| zabbix | 192.168.118.137 |
backup部署zabbix客户端
//创建用户
[root@backup ~]# useradd -rMs /sbin/nologin zabbix
//下载编译工具和依赖包
[root@backup ~]# dnf -y install make gcc gcc-c++ pcre-devel openssl openssl-devel
//下载软件包
[root@backup ~]# wget wget https://cdn.zabbix.com/zabbix/sources/stable/6.2/zabbix-6.2.2.tar.gz
//解压，编译安装zabbix_agentd
[root@backup ~]# tar -xf zabbix-6.2.2.tar.gz
[root@backup ~]# cd zabbix-6.2.2/
[root@backup zabbix-6.2.2]# ./configure --enable-agent
[root@backup zabbix-6.2.2]# make install
//修改配置文件
[root@backup ~]# vim /usr/local/etc/zabbix_agentd.conf
…………
Server=192.168.118.137 //服务端主机ip
…………
ServerActive=192.168.118.137 //agent主动模式
…………
Hostname=backup //zabbix系统内主机名
…………
//启动zabbix_agentd
[root@backup ~]# zabbix_agentd
[root@backup ~]# ss -antl
State Recv-Q Send-Q Local Address:Port Peer Address:Port Process
LISTEN 0 128 0.0.0.0:22 0.0.0.0:*
LISTEN 0 128 0.0.0.0:10050 0.0.0.0:*
LISTEN 0 128 [::]:22 [::]:*
backup上编写脚本
[root@backup ~]# cd /scripts/
[root@backup scripts]# vim check_keepalived.sh
[root@backup scripts]# cat check_keepalived.sh
#!/bin/bash
if [ `ip a show ens33 |grep 192.168.118.250|wc -l` -ne 0 ]
then
echo "1"
else
echo "0"
fi
#在最后一行添加
[root@backup ~]# vim /usr/local/etc/zabbix_agentd.conf
UserParameter=check_keepalived,/bin/bash /scripts/check_keepalived.sh
#更改配置文件后重启zabbix服务
[root@backup ~]# pkill zabbix
[root@backup ~]# zabbix_agentd
zabbix服务端测试脚本
[root@zabbix ~]# zabbix_get -s 192.168.118.128 -k check_keepalived
0
监控backup服务器
添加监控主机
添加监控项
查看监控数据
添加触发器
若需要添加邮件报警请参考zabbix监控流程
测试
Keepalived配置里同一 VRRP实例如果 virtual_router_id两端参数配置不一致也会导致裂脑问题发生。
让主备产生脑裂
[root@backup ~]# vim /etc/keepalived/keepalived.conf
[root@backup ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id lb02
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 50 //正常情况下此处id主备一致 改为不一致就可以产生脑裂
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
192.168.118.250
}
notify_master "/scripts/notify.sh master 192.168.118.250"
notify_backup "/scripts/notify.sh backup 192.168.118.250"
}
virtual_server 192.168.118.250 80 {
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
real_server 192.168.118.129 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.118.128 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
//重启服务
[root@backup ~]# systemctl restart keepalived
查看VIP
master
[root@master ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:0c:29:b5:9a:13 brd ff:ff:ff:ff:ff:ff
inet 192.168.118.129/24 brd 192.168.118.255 scope global dynamic noprefixroute ens33
valid_lft 1066sec preferred_lft 1066sec
inet 192.168.118.250/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:feb5:9a13/64 scope link noprefixroute
valid_lft forever preferred_lft forever
backup
[root@backup ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:0c:29:16:02:99 brd ff:ff:ff:ff:ff:ff
inet 192.168.118.128/24 brd 192.168.118.255 scope global dynamic noprefixroute ens33
valid_lft 1054sec preferred_lft 1054sec
inet 192.168.118.250/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe16:299/64 scope link noprefixroute
valid_lft forever preferred_lft forever
同时存在vip
