puppet-aodh模块

0.理解Aodh

Aodh是Openstack告警项目,最初在Havana版本中作为Ceilometer项目的一个组件(ceilometer-alarm)出现在Ceilometer项目中,在Liberty版本中演变成了独立项目Aodh,用户可以为独立事件或者样本设置阈值和告警机制。

Aodh服务由以下组件组成:

名称

说明

openstack-aodh-api

为告警数据的存储和访问提供接口

openstack-aodh-evaluator

根据统计的数据,来评估是否需要触发告警

openstack-aodh-notifier

根据配置的告警方式,发出告警

openstack-aodh-listener

监听事件,触发事件相关的告警

1.先睹为快

不想看下面大段的代码解析,已经跃跃欲试了?

OK,我们开始吧!

打开虚拟机终端并输入以下命令:

$ puppet apply examples/aodh.pp

等待命令执行完成,Puppet完成了对Aodh服务的安装。

注:部署Aodh服务,依赖于Keystone服务。

2.核心代码讲解

class aodh

class aodh完成了以下三项任务:

  • Aodh common包的安装

  • Aodh配置文件的清理

  • RabbitMQ和AMQP选项的管理

其中rabbit和AMQP相关的选项管理均是通过oslo::messaging::rabbit和oslo::messaging::amqp来管理,关于puppet-oslo模块,将会在下一个章节详细介绍。

  oslo::messaging::rabbit { 'aodh_config':
    rabbit_userid               => $rabbit_userid,
    rabbit_password             => $rabbit_password,
    rabbit_virtual_host         => $rabbit_virtual_host,
    rabbit_host                 => $rabbit_host,
    rabbit_port                 => $rabbit_port,
    rabbit_hosts                => $rabbit_hosts,
    rabbit_ha_queues            => $rabbit_ha_queues,
    heartbeat_timeout_threshold => $rabbit_heartbeat_timeout_threshold,
    heartbeat_rate              => $rabbit_heartbeat_rate,
    rabbit_use_ssl              => $rabbit_use_ssl,
    kombu_reconnect_delay       => $kombu_reconnect_delay,
    kombu_ssl_version           => $kombu_ssl_version,
    kombu_ssl_keyfile           => $kombu_ssl_keyfile,
    kombu_ssl_certfile          => $kombu_ssl_certfile,
    kombu_ssl_ca_certs          => $kombu_ssl_ca_certs,
    kombu_compression           => $kombu_compression,
    amqp_durable_queues         => $amqp_durable_queues,
  }

在package资源中,有一个元属性tag:

package { 'aodh':
  ensure => $package_ensure_real,
  name   => $::aodh::params::common_package_name,
  tag    => ['openstack', 'aodh-package'],
}

tag顾名思义就是标签,资源、类和定义都可以对其标记,一个资源可以有任意数量的标记。有多种标记资源的方式,以上代码是使用了元参数tag,对aodh package资源 添加了2个tag:'openstack','aodh-package'。这些tag会在aodh::deps中使用,用于收集标记为aodh-package的package资源:

 anchor { 'aodh::install::begin': }
  -> Package<| tag == 'aodh-package'|>
  ~> anchor { 'aodh::install::end': }

class aodh::api

api的主要是提供数据的接口,为告警数据的提供存储和访问。在class aodh::api中先是定义了以下几个依赖关系:

   if $auth_strategy == 'keystone' {
    include ::aodh::keystone::authtoken
  }

  Aodh_config<||> ~> Service[$service_name]
  Class['aodh::policy'] ~> Service[$service_name]

  Package['aodh-api'] -> Service[$service_name]
  Package['aodh-api'] -> Service['aodh-api']
  Package['aodh-api'] -> Class['aodh::policy']
  package { 'aodh-api':
    ensure => $package_ensure,
    name   => $::aodh::params::api_package_name,
    tag    => ['openstack', 'aodh-package'],
  }

代码中两种符号'->'和'~>',这两者都是描述资源间的依赖,前面已经介绍过。同时在模块中都同样使用keystone作为认证。API类中其余代码则是对参数进行配置,略过。

class aodh::evaluator

  if $manage_service {
    if $enabled {
      $service_ensure = 'running'
    } else {
      $service_ensure = 'stopped'
    }
  }
  Package['aodh'] -> Service['aodh-evaluator']
  service { 'aodh-evaluator':
    ensure     => $service_ensure,
    name       => $::aodh::params::evaluator_service_name,
    enable     => $enabled,
    hasstatus  => true,
    hasrestart => true,
    tag        => ['aodh-service','aodh-db-sync-service']
  }
  )

aodh-evaluator 服务的部署和 aodh-api 类似,配置一些基础配置和 oslo 相关配置,就可以启动服务了。

class aodh::notifier

  Package['aodh'] -> Service['aodh-notifier']
  service { 'aodh-notifier':
    ensure     => $service_ensure,
    name       => $::aodh::params::notifier_service_name,
    enable     => $enabled,
    hasstatus  => true,
    hasrestart => true,
    tag        => 'aodh-service',
  }
}

class aodh::listener

  Package['aodh'] -> Service['aodh-listener']
  service { 'aodh-listener':
    ensure     => $service_ensure,
    name       => $::aodh::params::listener_service_name,
    enable     => $enabled,
    hasstatus  => true,
    hasrestart => true,
    tag        => 'aodh-service',
  }
}

小结

从上述的代码中,咱们可清晰看到aodh的安装、数据库创建与同步、认证、api、evaluator、notifier、listener服务的配置、启动、管理。源于aodh手动部署文档。

动手练习

  1. 配置Aodh运行在httpd下运行

  2. 使用AMQP替换RabbitMQ

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