keepalived 自生存活监测
keepalived 自生存活监测
vrrp script
keepalived调用外部的辅助脚本进行资源监控，并根据监控的结果状态能实现优先动态调整。也就是keepalived监测自身，当自身挂了以后主动让出VIP。
须要对
vrrp_script:自定义资源监控脚本，vrrp实例根据脚本返回值进行下一步操做，脚本可被多个实例调用。
track_script:调用vrrp_script定义的脚本去监控资源，定义在实例以内，调用事先定义的vrrp_scriptlinux
vrrp_scriptvim
vrrp_script <SCRIPT_NAME> { #定义 名称
script <STRING>|<QUOTED-STRING> #定义脚本所在的位置
interval <INTEGER> #间隔多久执行一次脚本
timeout <INTEGER> #多久么有返回值就失败
weight <INTEGER:-254..254> #权重-254到254，若是监测失败则当前优先权减去次权重，若是
rise <INTEGER> #服务器下线了开始监测多少测成功则上线
fall <INTEGER> #服务器连续检测多少测都失败，则标记为失败
user USERNAME [GROUPNAME] #通常为root
init_fail #在未进行监测时，默认为失败。
}
keepalived+lvs实现自生存活监测
因为lvs没有进程，因此只能使用脚本去访问第三方的设备来探测本身是否存活，好比本机的端口，或者网关。后端
配置方法1
1.建立出一个ping脚本bash
[root@s1 ~]# vim /etc/keepalived/ping.sh
#!/bin/bash
ping -c 2 172.20.0.1 &> /dev/null
if [ $? -eq 0 ];then
exit 0
else
exit 2
fi
2.修改keepalived配置文件服务器
vrrp_script check { #定义脚本
script /etc/keepalived/ping.sh
interval 2
weight -50
fall 3
rise 5
timeout 2
}
vrrp_instance VI_1 {
state Master
interface ens33
virtual_router_id 27
priority 100
advert_int 2
authentication {
auth_type PASS
auth_pass 1111
}
unicast_src_ip 172.20.27.10
unicast_peer {
172.20.27.11
}
virtual_ipaddress {
172.20.27.100 dev ens33 label ens33:0
}
track_script { #调用脚本
check
}
}
#在另外一台主机上也执行相同的配置
3.重启服务后查看vipcurl
[root@s1 ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.10 netmask 255.255.0.0 broadcast 172.20.255.255
inet6 fe80::20c:29ff:fec5:123c prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:c5:12:3c txqueuelen 1000 (Ethernet)
RX packets 540749 bytes 43766835 (41.7 MiB)
RX errors 0 dropped 12 overruns 0 frame 0
TX packets 78080 bytes 11718371 (11.1 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.100 netmask 255.255.255.255 broadcast 0.0.0.0
ether 00:0c:29:c5:12:3c txqueuelen 1000 (Ethernet)
#vip在当前的主机上
4.测试
更改ping.sh脚本中的地址到一个不存在的地址，并对keepalived日志进行跟踪ide
[root@s1 ~]# tail -f /var/log/messages Jun 8 15:48:37 s1 Keepalived_healthcheckers[10792]: SMTP alert successfully sent. Jun 8 15:50:05 s1 Keepalived_vrrp[10793]: /etc/keepalived/ping.sh exited due to signal 15 #脚本监测失败 Jun 8 15:50:07 s1 Keepalived_vrrp[10793]: /etc/keepalived/ping.sh exited due to signal 15 #脚本监测失败 Jun 8 15:50:09 s1 Keepalived_vrrp[10793]: VRRP_Script(check) timed out #连续三次次超时 Jun 8 15:50:09 s1 Keepalived_vrrp[10793]: VRRP_Instance(VI_1) Changing effective priority from 100 to 50 #优先级从100下降到50 Jun 8 15:50:09 s1 Keepalived_vrrp[10793]: /etc/keepalived/ping.sh exited due to signal 15 #脚本监测失败 Jun 8 15:50:11 s1 Keepalived_vrrp[10793]: VRRP_Instance(VI_1) Received advert with higher priority 80, ours 50 #发现备节点的优先级比本机高，主动让出vip
查看vip是否在s2节点上oop
[root@s2 ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.11 netmask 255.255.0.0 broadcast 172.20.255.255
inet6 fe80::20c:29ff:fe4d:1ce3 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:4d:1c:e3 txqueuelen 1000 (Ethernet)
RX packets 535679 bytes 43641678 (41.6 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 36428 bytes 3457323 (3.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.100 netmask 255.255.255.255 broadcast 0.0.0.0
ether 00:0c:29:4d:1c:e3 txqueuelen 1000 (Ethernet)
#VIP在备节点上
配置方法2
在脚本中判断lvs后端的服务器是否存在，若是存不存在，则建立一个文件
在vrrp_script中判断文件是否存在若是文件存在，则表示本身挂了，将本身的优先级减低让出vip测试
script "/bin/bash -c '[[ -f /etc/keepalived/down ]]' && exit 7 || exit 0"
HAProxy+keepalived的检测机制
HAProxy+keepalived的检测方式能够使用curl HAProxy的状态页面，或者使用killall -0对HAProxy发送一个信号，若是进程存在则返回值为0，若是进程不存在则返回值为非0url
配置方法1
1.建立检测脚本
[root@s1 ~]# vim /etc/keepalived/curl.sh
#!/bin/bash
curl -I http://172.20.27.10:9000/haproxy-status &> /dev/null
if [ $? -eq 0 ];then
exit 0
else
exit 2
fi
2.修改keepalived配置文件定义vrrp_script和调用
root@s1 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@mylinuxops.com
}
notification_email_from root@mylinuxops.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id s1.mylinuxops.com
vrrp_skip_check_adv_addr
#vrrp_strict
vrrp_iptables
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_script check { #定义脚本名
script /etc/keepalived/curl.sh #定义脚本路径
interval 2
weight -50
fall 3
rise 5
timeout 2
}
vrrp_instance VI_1 {
state Master
interface ens33
virtual_router_id 27
priority 100
advert_int 2
authentication {
auth_type PASS
auth_pass 1111
}
unicast_src_ip 172.20.27.10
unicast_peer {
172.20.27.11
}
virtual_ipaddress {
172.20.27.100 dev ens33 label ens33:0
}
track_script {
check #调用脚本
}
}
#另外一台服务器也执行相同的操做
3.重启服务后查看vip是否存在
[root@s1 ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.10 netmask 255.255.0.0 broadcast 172.20.255.255
inet6 fe80::20c:29ff:fec5:123c prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:c5:12:3c txqueuelen 1000 (Ethernet)
RX packets 639634 bytes 52435377 (50.0 MiB)
RX errors 0 dropped 12 overruns 0 frame 0
TX packets 103375 bytes 13944325 (13.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.100 netmask 255.255.255.255 broadcast 0.0.0.0
ether 00:0c:29:c5:12:3c txqueuelen 1000 (Ethernet)
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 4511 bytes 317479 (310.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4511 bytes 317479 (310.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
4.中止haproxy并追踪日志
[root@s1 ~]# tail -f /var/log/messages Jun 8 17:15:16 s1 Keepalived_vrrp[16954]: /etc/keepalived/curl.sh exited with status 2 Jun 8 17:15:18 s1 Keepalived_vrrp[16954]: /etc/keepalived/curl.sh exited with status 2 Jun 8 17:15:20 s1 Keepalived_vrrp[16954]: /etc/keepalived/curl.sh exited with status 2 #连续3次没法curl到页面 Jun 8 17:15:20 s1 Keepalived_vrrp[16954]: VRRP_Script(check) failed Jun 8 17:15:20 s1 Keepalived_vrrp[16954]: VRRP_Instance(VI_1) Changing effective priority from 100 to 50 #自动将优先级下降50 Jun 8 17:15:22 s1 Keepalived_vrrp[16954]: VRRP_Instance(VI_1) Received advert with higher priority 80, ours 50 #发现备的优先级比本身高 Jun 8 17:15:22 s1 Keepalived_vrrp[16954]: VRRP_Instance(VI_1) Entering BACKUP STATE #本身转为备 Jun 8 17:15:22 s1 Keepalived_vrrp[16954]: VRRP_Instance(VI_1) removing protocol VIPs. Jun 8 17:15:22 s1 Keepalived_vrrp[16954]: /etc/keepalived/curl.sh exited with status 2 Jun 8 17:15:24 s1 Keepalived_vrrp[16954]: /etc/keepalived/curl.sh exited with status 2
配置方法2
使用killall -0 haproxy对进程发起信号
1.安装killall
[root@s1 ~]# yum install psmisc -y
2.修改配置文件
[root@s1 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@mylinuxops.com
}
notification_email_from root@mylinuxops.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id s1.mylinuxops.com
vrrp_skip_check_adv_addr
#vrrp_strict
vrrp_iptables
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_script check { #定义脚本名称
script "killall -0 haproxy" #因为脚本中只有一条命令，直接写在这里就行，无需再写脚本
interval 2
weight -50
fall 3
rise 5
timeout 2
}
vrrp_instance VI_1 {
state Master
interface ens33
virtual_router_id 27
priority 100
advert_int 2
authentication {
auth_type PASS
auth_pass 1111
}
unicast_src_ip 172.20.27.10
unicast_peer {
172.20.27.11
}
virtual_ipaddress {
172.20.27.100 dev ens33 label ens33:0
}
track_script {
check #调用脚本
}
}
3.重启服务后查看vip是否存在
[root@s1 ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.10 netmask 255.255.0.0 broadcast 172.20.255.255
inet6 fe80::20c:29ff:fec5:123c prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:c5:12:3c txqueuelen 1000 (Ethernet)
RX packets 639634 bytes 52435377 (50.0 MiB)
RX errors 0 dropped 12 overruns 0 frame 0
TX packets 103375 bytes 13944325 (13.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.100 netmask 255.255.255.255 broadcast 0.0.0.0
ether 00:0c:29:c5:12:3c txqueuelen 1000 (Ethernet)
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 4511 bytes 317479 (310.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4511 bytes 317479 (310.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
4.中止haproxy并追踪日志
[root@s1 ~]# tail -f /var/log/messages Jun 8 17:30:53 s1 Keepalived_vrrp[18639]: /usr/bin/killall -0 haproxy exited with status 1 Jun 8 17:30:55 s1 Keepalived_vrrp[18639]: /usr/bin/killall -0 haproxy exited with status 1 Jun 8 17:30:57 s1 Keepalived_vrrp[18639]: /usr/bin/killall -0 haproxy exited with status 1 Jun 8 17:30:57 s1 Keepalived_vrrp[18639]: VRRP_Script(check) failed #连续监测3次失败 Jun 8 17:30:57 s1 Keepalived_vrrp[18639]: VRRP_Instance(VI_1) Changing effective priority from 100 to 50 #优先级下降为50 Jun 8 17:30:59 s1 Keepalived_vrrp[18639]: VRRP_Instance(VI_1) Received advert with higher priority 80, ours 50 #发现有优先级比当前高的主机 Jun 8 17:30:59 s1 Keepalived_vrrp[18639]: VRRP_Instance(VI_1) Entering BACKUP STATE #自动将为备 Jun 8 17:30:59 s1 Keepalived_vrrp[18639]: VRRP_Instance(VI_1) removing protocol VIPs. #移除vip Jun 8 17:30:59 s1 Keepalived_vrrp[18639]: /usr/bin/killall -0 haproxy exited with status 1 Jun 8 17:31:01 s1 Keepalived_vrrp[18639]: /usr/bin/killall -0 haproxy exited with status 1 Jun 8 17:31:03 s1 Keepalived_vrrp[18639]: /usr/bin/killall -0 haproxy exited with status 1
相关文章
- 1. 生活自勉
- 2. zabbix监控进程存活
- 3. 自动监测内存泄漏
- 4. 开发监测keepalived裂脑的脚本
- 5. keepalived 几种健康监测方式
- 6. 服务器状态监测 Keepalived
- 7. Keepalived 服务器状态监测
- 8. Nginx生命活动监控
- 9. TiDB监控实现--存活监控
- 10. keepalived+nginx之监测脚本没法中止keepalived服务
- 更多相关文章...
- • 现实生活中的 XML - XML 教程
- • 自定义TypeHandler - MyBatis教程
- • 三篇文章了解 TiDB 技术内幕——说存储
- • RxJava操作符（十）自定义操作符
相关标签/搜索
每日一句
-
每一个你不满意的现在，都有一个你没有努力的曾经。
欢迎关注本站公众号,获取更多信息
相关文章
- 1. 生活自勉
- 2. zabbix监控进程存活
- 3. 自动监测内存泄漏
- 4. 开发监测keepalived裂脑的脚本
- 5. keepalived 几种健康监测方式
- 6. 服务器状态监测 Keepalived
- 7. Keepalived 服务器状态监测
- 8. Nginx生命活动监控
- 9. TiDB监控实现--存活监控
- 10. keepalived+nginx之监测脚本没法中止keepalived服务