Puppet Host资源介绍(二十一)
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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# 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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# 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/Admin/Exec/returns: executed successfully
Notice: /Stage/Admin::Hosts/Host/ensure: created
Info: Computing checksum on file /etc/hosts
Notice: Finished catalog run in 0.23 seconds
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# 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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# 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/Admin/Exec/returns: executed successfully
Notice: /Stage/Admin::Hosts/Host/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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# 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.
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