Puppet Host资源介绍(二十一)

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puppet host资源
        host资源主要用来管理操作系统的hosts功能，hosts是一个没有扩展名的系统文件,基本作用就是关联ip和域名,当用户打开一个网址会首先从hosts解析，如果没有再去dns查找解析.linux系统存放在/etc/hosts文件中。

使用puppet describe host查看资源帮助信息:

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[iyunv@sh-proxy2 local]# puppet describe host host ==== Installs and manages host entries.  For most systems, these entries will just be in `/etc/hosts`, but some systems (notably OS X) will have different solutions. Parameters ---------- - **comment**     A comment that will be attached to the line with a # character. - **ensure**     The basic property that the resource should be in.     Valid values are `present`, `absent`. - **host_aliases**     Any aliases the host might have.  Multiple values must be     specified as an array. - **ip**     The host's IP address, IPv4 or IPv6. - **name**     The host name. - **target**     The file in which to store service information.  Only used by     those providers that write to disk. On most systems this defaults to     `/etc/hosts`. Providers ---------     parsed

host资源常用的属性:
host {"资源标题":
        ensure
        ip
        name
        host_aliases
        target
}

资源参数意义:
ensure：确定该主机是否启用,值为present即启用,值为absent即关闭.
ip：主机的ip，支持ipv6.
name：主机名.
target：指定自定义host文件位置.


依旧使用old 三台机器演示:
192.168.30.134        puppet
192.168.30.131        sh-web1(web用途)
192.168.30.132        sh-proxy2(proxy)

之前文章写过定义admin模块为基础模块，所以将host资源加入admin模块即可使用。

说明:admin模块的init.pp文件声明admin::hosts类.

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class admin {     include admin::hosts     exec {"selinux":         command => "sed -i '/^SELINUX=/s/=.*/=disabled/g' /etc/sysconfig/selinux",         path => ["/bin/","/sbin/","/usr/bin/","/usr/sbin/"],         user => root,         group => root,     } }

说明:admin的manifests资源目录下新建hosts.pp文件:

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class admin::hosts {     host {"puppet":         ensure => present,         ip => "192.168.30.134",     }     host {"sh-web1":         ensure => present,         ip => "192.168.30.131",     }     host {"sh-proxy2":         ensure => present,         ip => "192.168.30.132",     }     host {"test.example.com":         ensure => present,         host_aliases => ["db","web"],         ip => "192.168.30.137",     } }

puppet 入口文件nodes.pp所有主机都继承admin.
说明:nodes.pp文件内容:

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

说明:下面的更新是没有加"host_aliases"别名的更新，为了区别别名效果.

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[iyunv@sh-proxy2 local]# puppet agent -t Info: Retrieving pluginfacts Info: Retrieving plugin Info: Loading facts Info: Caching catalog for sh-proxy2.localdomain Info: Applying configuration version '1507646562' Notice: /Stage[main]/Admin/Exec[selinux]/returns: executed successfully Notice: /Stage[main]/Admin::Hosts/Host[test.example.com]/ensure: created Info: Computing checksum on file /etc/hosts Notice: Finished catalog run in 0.23 seconds

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[iyunv@sh-proxy2 local]# cat /etc/hosts # HEADER: This file was autogenerated at Tue Oct 10 22:42:50 +0800 2017 # HEADER: by puppet.  While it can still be managed manually, it # HEADER: is definitely not recommended. 127.0.0.1localhostlocalhost.localdomain localhost4 localhost4.localdomain4 ::1localhostlocalhost.localdomain localhost6 localhost6.localdomain6 192.168.30.134puppet 192.168.30.131sh-web1 192.168.30.132sh-proxy2 192.168.30.137test.example.com

说明:下面的更新是加了"host_aliases"别名的更新，为了区别别名效果.

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[iyunv@sh-proxy2 local]# puppet agent -t Info: Retrieving pluginfacts Info: Retrieving plugin Info: Loading facts Info: Caching catalog for sh-proxy2.localdomain Info: Applying configuration version '1507646705' Notice: /Stage[main]/Admin/Exec[selinux]/returns: executed successfully Notice: /Stage[main]/Admin::Hosts/Host[test.example.com]/host_aliases: defined 'host_aliases' as 'db web' Info: Computing checksum on file /etc/hosts Notice: Finished catalog run in 0.23 seconds

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[iyunv@sh-proxy2 local]# cat /etc/hosts # HEADER: This file was autogenerated at Tue Oct 10 22:45:07 +0800 2017 # HEADER: by puppet.  While it can still be managed manually, it # HEADER: is definitely not recommended. 127.0.0.1localhostlocalhost.localdomain localhost4 localhost4.localdomain4 ::1localhostlocalhost.localdomain localhost6 localhost6.localdomain6 192.168.30.134puppet 192.168.30.131sh-web1 192.168.30.132sh-proxy2 192.168.30.137test.example.comdb web

总结:其实方法不止这一种,hosts文件上篇写了file资源用法，可以直接写一个/etc/hosts file文件,所有主机下发这个文件也可以起到配置/etc/hosts的效果.