Puppet 条件判断语句(十六)

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目前puppet2.7以上版本都支持if...elif ...else...、selecter和case语句.它们的条件判断分为两类:一类为条件执行(if...elif ...else...、selecter)通过逻辑判断来选择要执行的特定代码或加载代码;另一类(case)是循环执行类,依照代码规则来执行代码或加载代码.if条件判断语句:
示例一:

if判断系统发行版本安装apache软件包:

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[iyunv@sh-web1 ~]# cat apache.pp if $operatingsystem == 'CentOS' {     $packages = 'httpd' } elsif $operatingsystem == 'Redhat' {     $packages = 'httpd' } else {     $packages = 'apache2' }     package {"$packages":     ensure=> "present", }

本地应用puppet代码:

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[iyunv@sh-web1 ~]# puppet apply apache.pp Notice: Compiled catalog for sh-web1.localdomain in environment production in 0.04 seconds Notice: /Stage[main]/Main/Package[httpd]/ensure: created Notice: Finished catalog run in 1.78 seconds

注意:"=="是等于的意思，完完全全匹配到对应的.

示例二:
if匹配hostname主机载入相应的puppet模块.(if在node.pp文件中匹配主机很少用,几乎都是用case.)

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node base {     include admin } node /sh-(proxy|web)\d+/  inherits base {     if $hostname =~ /sh-proxy\d+/ {         include apache     } elsif $hostname =~ /sh-web\d+/ {         include php     } else {         include nginx::nginxconf     } }

agent端更新puppet代码.

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[iyunv@sh-proxy2 ~]# puppet agent -t Info: Retrieving pluginfacts Info: Retrieving plugin Info: Loading facts Info: Caching catalog for sh-proxy2.localdomain Info: Applying configuration version '1506450177' Notice: /Stage[main]/Admin/Exec[selinux]/returns: executed successfully Notice: /Stage[main]/Install/Package[httpd]/ensure: created Notice: /Stage[main]/Service/Service[httpd]/ensure: ensure changed 'stopped' to 'running' Info: /Service[httpd]: Unscheduling refresh on Service[httpd] Notice: Finished catalog run in 20.24 seconds

agent端更新puppet代码.

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[iyunv@sh-web1 ~]# puppet agent -t Notice: Ignoring --listen on onetime run Info: Retrieving pluginfacts Info: Retrieving plugin Info: Loading facts Info: Caching catalog for sh-web1.localdomain Info: Applying configuration version '1506450177' Notice: /Stage[main]/Admin/Exec[selinux]/returns: executed successfully Notice: /Stage[main]/Php/Package[php]/ensure: created Notice: /Stage[main]/Php/Package[php-devel]/ensure: created Notice: Finished catalog run in 4.01 seconds

注意:"=~"是匹配的意思，只要匹配到就行.

case语句应用:
示例:(之前文章一直都在用的匹配方法case)

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node base { include admin } node /sh-(proxy|web)\d+/  inherits base {   case $::hostname {     /sh-proxy\d+/: {          include apache       }      "sh-web1": {             include nginx::nginxconf             include php          }     } }

agent端更新就不演示了,上面的case语句博客开始就是这样写的.