Keepalived（二）

Keeplived脚本检测

主机环境

IP	服务	描述
192.168.197.154	keepalived httpd	keepalive主服务器
192.168.197.155	keepalived httpd	keepalive备服务器

步骤

• 编写主服务器检测脚本

[root@localhost scripts]# vim check_httpd.sh 

#!/bin/bash
httpd_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bhttpd\b'|wc -l)
if [ $httpd_status -lt 1 ];then
            systemctl stop keepalived
    fi

[root@localhost scripts]# chmod +x check_httpd.sh

• 测试脚本

[root@localhost scripts]# systemctl start keepalived


## 打开http 和 keepalive服务 ，此时vip在主服务器上
[root@localhost scripts]# ip a
......
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:4e:98:e3 brd ff:ff:ff:ff:ff:ff
    inet 192.168.197.154/24 brd 192.168.197.255 scope global dynamic noprefixroute ens33
       valid_lft 1676sec preferred_lft 1676sec
    inet 192.168.197.250/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::c733:208:3487:d373/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

## 模拟关闭httpd服务，执行脚本，此时keepalived服务停止

[root@localhost scripts]# systemctl stop httpd

[root@localhost scripts]# ./check_httpd.sh 

[root@localhost scripts]# ip a
......
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:4e:98:e3 brd ff:ff:ff:ff:ff:ff
    inet 192.168.197.154/24 brd 192.168.197.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe4e:98e3/64 scope link 
       valid_lft forever preferred_lft forever



# keepalived自动停止
[root@localhost scripts]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
   Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
   Active: inactive (dead)

• 编写状态切换脚本

[root@localhost scripts]# vim notify.sh 
#!/bin/bash
VIP=$2
case "$1" in
  master)
        httpd_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bhttpd\b'|wc -l)
        if [ $httpd_status -lt 1 ];then
            systemctl start httpd
        fi
        sendmail
  ;;
  backup)
        httpd_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bhttpd\b'|wc -l)
        if [ $httpd_status -gt 0 ];then
            systemctl stop httpd
        fi
  ;;
  *)
        echo "Usage:$0 master|backup VIP"
  ;;
esac

• 配置主备keepalive配置文件

 # 编辑master服务器配置文件
[root@localhost scripts]# vim /etc/keepalived/keepalived.conf


! Configuration File for keepalived

global_defs {
   router_id lb01
}

vrrp_script httpd_check {
    script "/scripts/check_httpd.sh"
    interval 1
    weight -20
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.197.250/24
    }
    track_script {
        httpd_check
    }
    notify_master "/scripts/notify.sh master 192.168.197.250"
    notify_backup "/scripts/notify.sh backup 192.168.197.250"
}

virtual_server 192.168.197.250 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP

    real_server 192.168.197.154 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    real_server 192.168.197.155 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}


# 编辑backup服务器配置文件
[root@localhost scripts]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   router_id lb02
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.197.250/24
    }
    notify_master "/scripts/notify.sh master 192.168.197.250"
    notify_backup "/scripts/notify.sh backup 192.168.197.250"
}

virtual_server 192.168.197.250 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP

    real_server 192.168.197.154 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    real_server 192.168.197.155 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

• 脚本测试

# master上模拟停止http服务

[root@localhost scripts]# systemctl stop httpd

## 查看ip，发现vip已经不存在，且keepalived停止
[root@localhost scripts]# ip a
......
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:4e:98:e3 brd ff:ff:ff:ff:ff:ff
    inet 192.168.197.154/24 brd 192.168.197.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe4e:98e3/64 scope link 
       valid_lft forever preferred_lft forever

[root@localhost scripts]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
   Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
   Active: inactive (dead)
   
# 查看backup主机上的ip,VIP已经出现，且keepalived服务启动
[root@localhost scripts]# ip a
......
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:06:50:c1 brd ff:ff:ff:ff:ff:ff
    inet 192.168.197.155/24 brd 192.168.197.255 scope global dynamic noprefixroute ens33
       valid_lft 1536sec preferred_lft 1536sec
    inet 192.168.197.250/24 scope global secondary ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::d665:370e:61d8:385c/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

[root@localhost scripts]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
   Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
   Active: active (running) since Fri 2020-12-04 19:18:03 CST; 12min ago

keepalived + zabbix监控

环境

IP	服务	描述
192.168.197.154	keepalived httpd	keepalive主服务器
192.168.197.155	keepalived httpd zabbix_agent	keepalive备服务器，zabbix客户端
192.168.197.138	zabbix_agent zabbix_server	zabbix服务器

步骤

• 搭建LAMP及zabbix_server

...略

• zabbix客户端配置

# 安装依赖包
[root@localhost zabbix-5.2.0]# yum -y install pcre-devel
#创建系统用户
[root@localhost zabbix-5.2.0]# useradd -M -r -s /sbin/nologin zabbix

# 编译zabbix，客户机只用编译agent
[root@localhost zabbix-5.2.0]# ./configure --enable-agent
......
 LDAP support:          no
  IPv6 support:          no

***********************************************************
*            Now run 'make install'                       *
*                                                         *
*            Thank you for using Zabbix!                  *
*              <http://www.zabbix.com>                    *
***********************************************************
[root@localhost zabbix-5.2.0]# make install
......

2.配置agent配置文件

[root@localhost etc]# vim /usr/local/etc/zabbix_agentd.conf
......
# Server=

Server=192.168.197.138  # 配置zabbix_server IP地址
......

# ServerActive=

ServerActive=192.168.197.138   # 配置zabbix_server IP地址
......


# Hostname=

Hostname=zabbix_test   # 配置Hostname，此名字对应web页新增host名字
......

# 开启服务
[root@localhost etc]# zabbix_agentd 
[root@localhost etc]# ss -antl
State       Recv-Q       Send-Q               Local Address:Port                Peer Address:Port       
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                          [::]:*     

• zabbix添加主机

• zabbix_agent主机添加自定义监控脚本

[root@localhost scripts]# vim check_keepalived.sh
#!/bin/bash
  
if [ `ip a show ens33 |grep 192.168.197.250|wc -l` -ne 0 ]
then
        echo "1"
else
        echo "0"
fi

[root@localhost scripts]# chmod +x check_keepalived.sh



# 添加到配置文件中key
[root@localhost scripts]# vim /usr/local/etc/zabbix_agentd.conf
......
# TLSCipherAll=
UserParameter=check_keepalived,/bin/bash /scripts/check_keepalived

## 重启服务
[root@localhost zabbix]# pkill zabbix
[root@localhost zabbix]# zabbix_agentd 


## 服务端验证脚本可行性
[root@localhost src]# zabbix_get -s 192.168.197.155 -k check_keepalived
0

• web页添加监控项及触发器

• 测试

## master服务器关掉httpd服务
[root@localhost scripts]# systemctl stop httpd

root@localhost scripts]# ip a
......
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:4e:98:e3 brd ff:ff:ff:ff:ff:ff
    inet 192.168.197.154/24 brd 192.168.197.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe4e:98e3/64 scope link 
       valid_lft forever preferred_lft forever

• zabbix发生报警