Monit 在执行命令的第一个运行后给出错误

Question

我正在运行ning Monit 监控 DigitalOcean 上 ubuntu 服务器上的 cpu 使用情况。然后执行一些命令来启动或停止负载平衡器后面的其他服务器。

这是我的代码；

check system host_name
    if cpu usage > 50% for 5 cycles then exec "/bin/bash /var/www/start.sh"
    if cpu usage < 30% for 5 cycles then exec "/bin/bash /var/www/stop.sh"

并且在第一个运行之后，Monit 关闭一台服务器并进入错误模式。这是日志的一部分；

[UTC Jun 6 10:08:13] info : 'host_name' Monit reloaded

[UTC Jun 6 10:08:13] warning : 'host_name' cpu usage of 0.5% matches resource limit [cpu usage < 30.0%]

[UTC Jun 6 10:10:13] warning : 'host_name' cpu usage of 1.6% matches resource limit [cpu usage < 30.0%]

[UTC Jun 6 10:12:13] warning : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]

[UTC Jun 6 10:14:13] warning : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]

[UTC Jun 6 10:16:13] error : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]

[UTC Jun 6 10:16:13] info : 'host_name' exec: '/bin/bash /var/www/stop.sh'

[UTC Jun 6 10:18:13] error : 'host_name' cpu usage of 0.5% matches resource limit [cpu usage < 30.0%]

[UTC Jun 6 10:20:13] error : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]

[UTC Jun 6 10:22:13] error : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]

[UTC Jun 6 10:24:13] error : 'host_name' cpu usage of 0.2% matches resource limit [cpu usage < 30.0%]

[UTC Jun 6 10:26:13] error : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]

当它报错时，它就不再工作了。

Bash 脚本运行正常。

我做错了什么？

Answer 1

让我们分解一下要求 Monit 执行的操作：

if cpu usage < 30% for 5 cycles then exec "/bin/bash /var/www/stop.sh"

 warning : 'host_name' cpu usage of 0.5% matches resource limit [cpu usage < 30.0%]
 warning : 'host_name' cpu usage of 1.6% matches resource limit [cpu usage < 30.0%]
 warning : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]
 warning : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]

您的 cpu 使用率低于 30%，因此您收到 4 警告（但未采取任何措施）

if cpu usage < 30% for 5 cycles then exec "/bin/bash /var/www/stop.sh"

error : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]
info : 'host_name' exec: '/bin/bash /var/www/stop.sh'

我们已经到了第 5 个周期，它现在被认为是一个错误并且 /var/www/stop.sh 是运行

error : 'host_name' cpu usage of 0.5% matches resource limit [cpu usage < 30.0%]
error : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]
error : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]
error : 'host_name' cpu usage of 0.2% matches resource limit [cpu usage < 30.0%]
error : 'host_name' cpu usage of 0.3% matches resource limit [cpu usage < 30.0%]

由于它没有进一步的指示，它只是重复错误（因为它仍然存在）。如果你想再次监视运行 stop.sh，你需要告诉它（以及多久），例如你可以做

if cpu usage < 30% for 5 cycles then exec "/bin/bash /var/www/stop.sh" repeat every 5 cycles

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