木偶检测文件是否更改但不更改它

puppet detect if a file changed but don't change it

我想用 puppet 管理 jenkins-service 的 config.xml 文件。问题是,如果 Puppet 更改 config.xml 文件并重新启动 jenkins 服务,config.xml 文件将被当前加载的 jenkins 配置覆盖,并且 puppet 所做的更改将丢失。

这就是我现在拥有的:

file { '/var/lib/jenkins/config.xml':
  source    => 'puppet:///modules/jenkins/config.xml',
  owner     => jenkins,
  group     => jenkins,
  mode      => '0644'
}

service { 'jenkins':
  ensure    => running,
  enable    => true,
  subscribe => File['/var/lib/jenkins/config.xml']
}

我的方法是停止 jenkins 服务,而不是复制 config.xml 并再次启动该服务...当然,每次 puppet 运行时不应停止并重新启动该服务,但前提是 config.xml 改变了。我不知道如何用木偶做到这一点,即使有可能。有什么想法吗?

如有任何帮助,我们将不胜感激

file { '/var/lib/jenkins/config.xml':
  source    => 'puppet:///modules/jenkins/config.xml',
  owner     => jenkins,
  group     => jenkins,
  mode      => '0644',
  notify  => Service["jenkins"]
}

service { 'jenkins':
  ensure    => running,
  enable    => true,
  subscribe => File['/var/lib/jenkins/config.xml']
}

这将在初始创建或更改文件时通知服务 jenkins。

用 puppet 处理这件事有点痛苦,但一种方法是检测暂存文件的更改,然后使用 exec 对文件更改进行排序:

file { '/some/staging/path/config.xml':
  source    => 'puppet:///modules/jenkins/config.xml',
  owner     => jenkins,
  group     => jenkins,
  mode      => '0644',
  notify => Exec['Update Jenkins Config']
}

exec { 'Update Jenkins Config':
  command     => '/sbin/service jenkins stop && /bin/cp /some/staging/path/config.xml /var/lib/jenkins/config.xml && /sbin/service jenkins start',
  refreshonly => true
}

另一种方法是使用 transition module。 这是一个例子:

transition { 'stop jenkins service':
  resource   => Service['jenkins'],
  attributes => { ensure => stopped },
  prior_to   => File['/var/lib/jenkins/config.xml'],
}    

file { '/var/lib/jenkins/config.xml':
  source    => 'puppet:///modules/jenkins/config.xml',
  owner     => jenkins,
  group     => jenkins,
  mode      => '0644',
}

service { 'jenkins':
  ensure    => running,
  enable    => true,
}