puppet erb模板
在日常运维工作中有很多需求,他们各自有各自相对独立的差异化配置,如果要管理这些差异配置的话,就可以通过erb模板和模板语言来管理这些差异化服务器配置,这就是erb模板的主要应用场景.
ERB模板的体现就是一个文本文件,它以.erb作为扩展名来标示它的用途,代码如下:
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file { "/etc/php-fpm.d/www.conf" :
ensure => file ,
content => template( "php/wwwproxy.conf.erb" ),
} |
注意:这里模板文件的路径可以使用相对路径也可以使用绝对路径,相对路径通常用于C/S架构,绝对路径通常用于单机.
file资源中的source属性,与template函数调用模板形式,两者相比都可以实现同步文件的功能,但是过程和结果却不一样,file资源的source属性同步文件通过puppet的文件协议,将文件由源路径同步到目的路径,但是它并不能更改文件中的内容,从而可以实现根据需求来定制同步文件与内容。
file中的source示例:
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file { '/etc/haproxy/haproxy.cfg' :
ensure => present,
source => 'puppet:///modules/haproxy/haproxy.cfg' ,
notify => Exec[ '/etc/init.d/haproxy restart' ],
} |
puppet erb模板文件示例:
模板文件支持变量传参:
示例:
master端puppet代码:
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$ip_1= "8.8.8.8"
file { '/etc/resolv.conf' :
content => template( 'admin/etc/resolv.conf.erb' ),
} |
模板文件:
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; generated by /sbin/dhclient-script
search localdomain nameserver 192.168.30.2 nameserver <%= ip_1 %> |
agent端更新:
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[root@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 '1509984468'
Notice: /Stage [main] /Admin/Exec [selinux] /returns : executed successfully
Notice: /Stage [main] /Admin/File [ /etc/resolv .conf] /content :
--- /etc/resolv .conf2017-09-01 18:10:30.036376971 +0800
+++ /tmp/puppet-file20171106-37158-4dbt1c-02017-11-06 16:07:47.101648953 +0800
@@ -1,3 +1,4 @@ -; generated by /sbin/dhclient-script
-search localdomain -nameserver 192.168.30.2 +; generated by /sbin/dhclient-script
+search localdomain +nameserver 192.168.30.2 +nameserver 8.8.8.8 \ No newline at end of file
Info: Computing checksum on file /etc/resolv .conf
Info: /Stage [main] /Admin/File [ /etc/resolv .conf]: Filebucketed /etc/resolv .conf to puppet with sum a880aa161449e4801222f39b9087ad0b
Notice: /Stage [main] /Admin/File [ /etc/resolv .conf] /content : content changed '{md5}a880aa161449e4801222f39b9087ad0b' to '{md5}d64e778c4dd698a73b399c6430cd7fc4'
Notice: Finished catalog run in 0.30 seconds
|
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[root@sh-web1 ~] # cat /etc/resolv.conf
; generated by /sbin/dhclient-script
search localdomain nameserver 192.168.30.2 nameserver 8.8.8.8 |
puppet模板中的if...else...fi条件判断语句
if...elsif...else...fi条件语句需要放入以<%作为开始,以%>作为结束的符号内.另外需要注意<%if 条件表达式%>最后要以<% end %>作为结束.
模板文件内容:
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; generated by /sbin/dhclient-script
search localdomain <% if hostname =~ /sh-web \d/ %>
nameserver <%= ip_1 %> <% end %> nameserver 192.168.30.2 |
注释:模板使用if条件语句.
agent端更新测试:
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[root@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 '1509985283'
Notice: /Stage [main] /Admin/Exec [selinux] /returns : executed successfully
Notice: /Stage [main] /Admin/File [ /etc/resolv .conf] /content :
--- /etc/resolv .conf2017-11-06 16:20:16.706631342 +0800
+++ /tmp/puppet-file20171106-37995-5hvzbe-02017-11-06 16:21:21.839631273 +0800
@@ -1,7 +1,6 @@ ; generated by /sbin/dhclient-script
search localdomain
-$ip_1= "22.22.22.22"
+nameserver 8.8.8.8 nameserver 192.168.30.2
-nameserver 8.8.8.8 \ No newline at end of file
Info: Computing checksum on file /etc/resolv .conf
Info: /Stage [main] /Admin/File [ /etc/resolv .conf]: Filebucketed /etc/resolv .conf to puppet with sum b53bde035cf20d095306e09e84334fbc
Notice: /Stage [main] /Admin/File [ /etc/resolv .conf] /content : content changed '{md5}b53bde035cf20d095306e09e84334fbc' to '{md5}da4ff6163dd0c7c1108bb4d1838295d3'
Notice: Finished catalog run in 0.23 seconds
[root@sh-web1 ~] # cat /etc/resolv.conf
; generated by /sbin/dhclient-script
search localdomain nameserver 8.8.8.8 nameserver 192.168.30.2 |
each循环
each循环语句语法以<%作为开始,以 -%>作为结束.
puppet代码如下:
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$arry_value=[ '192.168.1.2' , '192.168.1.3' , '192.168.1.4' ]
file { '/etc/resolv.conf' :
content => template( 'admin/etc/resolv.conf.erb' ),
}
} |
模板文件内容:
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; generated by /sbin/dhclient-script
search localdomain <% arry_value.each do |val| -%>
nameserver <%= val %> <% end -%> nameserver 192.168.30.2 |
agent端更新:
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[root@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 '1509986539'
Notice: /Stage [main] /Admin/Exec [selinux] /returns : executed successfully
Notice: /Stage [main] /Admin/File [ /etc/resolv .conf] /content :
--- /etc/resolv .conf2017-11-06 16:21:21.846631274 +0800
+++ /tmp/puppet-file20171106-38795-2fa1gc-02017-11-06 16:42:17.130787147 +0800
@@ -1,6 +1,10 @@ ; generated by /sbin/dhclient-script
search localdomain
-nameserver 8.8.8.8 +nameserver 192.168.1.2 + +nameserver 192.168.1.3 + +nameserver 192.168.1.4 nameserver 192.168.30.2
Info: Computing checksum on file /etc/resolv .conf
Info: /Stage [main] /Admin/File [ /etc/resolv .conf]: Filebucketed /etc/resolv .conf to puppet with sum da4ff6163dd0c7c1108bb4d1838295d3
Notice: /Stage [main] /Admin/File [ /etc/resolv .conf] /content : content changed '{md5}da4ff6163dd0c7c1108bb4d1838295d3' to '{md5}d6824dac14f7cbbe73317e5a4034c2bf'
Notice: Finished catalog run in 0.24 seconds
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本文转自青衫解衣 51CTO博客,原文链接:http://blog.51cto.com/215687833/1979532