Puppet 条件判断语句(十六)
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:
# 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:
# puppet apply apache.pp
Notice: Compiled catalog for sh-web1.localdomain in environment production in 0.04 seconds
Notice: /Stage/Main/Package/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.)
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.
# 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/Admin/Exec/returns: executed successfully
Notice: /Stage/Install/Package/ensure: created
Notice: /Stage/Service/Service/ensure: ensure changed 'stopped' to 'running'
Info: /Service: Unscheduling refresh on Service
Notice: Finished catalog run in 20.24 seconds
agent端更新puppet代码.
# 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/Admin/Exec/returns: executed successfully
Notice: /Stage/Php/Package/ensure: created
Notice: /Stage/Php/Package/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)
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.
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