通过案例了解puppet创建虚拟资源解决资源冲突问题

虚拟资源是一种用来管理多种配置共同依赖同一资源的方法。如果多个类依赖同一个资源时则可避免写多个资源，也可以解决资源重定义的错误。 虚拟资源经常用于用户管理中，虚拟资源只会被声明一次，但可以运用一次或多次。

要使用虚拟资源是需要在资源声明开头加上字符“@”来使资源虚拟化。然后再使用下面两种方法之一来实例化虚拟资源：

• "飞船"语法<||>

• realize函数

更多详情可访问 www.kisspuppet.com  www.rsyslog.org

1. 定义两个用户，puppet和root，并将其虚拟化

注意定义虚拟资源必须在全局作用域或者节点作用域中定义，简单的理解，以下目录中site.pp就是全局作用域，包含（site.pp中import了nodes目录），其他模块中的都属于局部作用域。

1.1 在全局作用域中创建对应的pp文件

[root@linuxmaster1poc testing]# tree manifests/
manifests/
├── nodes
│   ├── puppetclient.pp
│   ├── virtual_group.pp
│   └── virtual_user.pp
└── site.pp
1 directory, 4 files

1.2 创建虚拟用户puppet、root、xiaonuo

[root@linuxmaster1poc testing]# vim manifests/nodes/virtual_user.pp
class alluser{include alluser::puppet,alluser::root
}
class alluser::puppet{@user { 'puppet':ensure => present,uid    => '52',gid    => '52',home   => '/var/lib/puppet',shell  => '/sbin/nologin',}
}
class alluser::root{@user { 'root':ensure => present,uid    => '0',gid    => '0',home   => '/root',shell  => '/bin/bash',}
}
class alluser::xiaonuo{@user { 'xiaonuo':ensure => present,uid    => '600',gid    => '600',home   => '/home/xiaonuo',shell  => '/sbin/nologin',}
}

1.3 创建虚拟组puppet、root和xiaonuo

[root@linuxmaster1poc testing]# vim manifests/nodes/virtual_group.pp
class allgroup{include allgroup::puppet,allgroup::root
}
class allgroup::puppet{@group { 'puppet':ensure    => present,name      => 'puppet',gid       => '52',allowdupe => false,members   => 'puppet',}
}
class allgroup::root{@group { 'root':ensure    => present,name      => 'root',gid       => '0',allowdupe => false,members   => 'root',}
}
class allgroup::xiaonuo{@group { 'xiaonuo':ensure    => present,name      => 'xiaonuo',gid       => '600',allowdupe => false,members   => 'xiaonuo',}
}

2. 编写puppet模块，将虚拟资源用户puppet和组puppet实化

2.1 编写pupppet模块

[root@linuxmaster1poc testing]# tree environment/modules/puppet
environment/modules/puppet
├── files
├── manifests
│   ├── config.pp
│   ├── init.pp
│   ├── install.pp
│   ├── params.pp
│   └── service.pp
├── README
└── templates├── auth.conf.erb├── namespaceauth.conf.erb└── puppet.conf.erb
3 directories, 9 files

2.2 编写puppet_linux57poc模块

[root@linuxmaster1poc testing]# tree agents/modules/puppet_linux57poc/
agents/modules/puppet_linux57poc/
├── files
├── manifests
│   └── init.pp
└── templates├── facts.txt.erb└── motd.erb
3 directories, 3 files

2.3 实例化虚拟资源

2.3.1 在puppet模块中实例化

[root@linuxmaster1poc testing]# vim environment/modules/puppet/manifests/config.pp
class puppet::config{include puppet::paramsinclude puppet::puppet_config,puppet::namespaceauth_config,puppet::auth_config,puppet::user,puppet::groupinclude alluser,allgroup #必须将节点作用域中的类包含进来
}
class puppet::puppet_config{file { '/etc/puppet/puppet.conf':ensure  => present,content => template('puppet/puppet.conf.erb'),owner   => 'puppet',group   => 'puppet',mode    => '0644',backup  => main,require => Class['puppet::install','puppet::user','puppet::group'],notify  => Class['puppet::service'],}
}
class puppet::auth_config{file { '/etc/puppet/auth.conf':ensure  => present,content => template('puppet/auth.conf.erb'),owner   => 'puppet',group   => 'puppet',mode    => '0644',backup  => main,require => Class['puppet::install','puppet::user','puppet::group'],notify  => Class['puppet::service'],}
}
class puppet::namespaceauth_config{file { '/etc/puppet/namespaceauth.conf':ensure  => present,content => template('puppet/namespaceauth.conf.erb'),owner   => 'puppet',group   => 'puppet',mode    => '0644',backup  => main,require => Class['puppet::install','puppet::user','puppet::group'],notify  => Class['puppet::service'],}
}
class puppet::user{ #使用飞船语法实化用户puppet资源
#  realize User['puppet']User <| title == 'puppet' |>
}
class puppet::group{ #使用realize函数实化组puppet资源realize Group['puppet']
#  Group <| title == 'puppet' |>
}

2.3.2 在puppet_linux57poc模块中实例化

[root@linuxmaster1poc testing]# cat agents/modules/puppet_linux57poc/manifests/init.pp
class puppet_linux57poc{include puppet_linux57poc::motd_install,puppet_linux57poc::motd_config,puppet_linux57poc::facts,puppet_linux57poc::user,puppet_linux57poc::groupinclude alluser,allgroup #必须将节点作用域中的类包含进来
}
class puppet_linux57poc::motd_install{package{ setup:ensure => present,}
}
class puppet_linux57poc::motd_config{file{ "/etc/motd":owner   => "xiaonuo",group   => "root",mode    => 0440,content => template("puppet_linux57poc/motd.erb"),backup  => 'main',require => Class['puppet_linux57poc::motd_install','puppet_linux57poc::user','puppet_linux57poc::group']}
}
class puppet_linux57poc::facts{file{ "/etc/mcollective/facts.txt":owner   => "root",group   => "root",mode    => 0400,content => template("puppet_linux57poc/facts.txt.erb"),backup  => 'main',require => Class['puppet_linux57poc::motd_install','puppet_linux57poc::user','puppet_linux57poc::group']}
}
class puppet_linux57poc::user{  #使用realize函数实化用户xiaonuo和root资源realize( User['xiaonuo'],User['root'] )
}
class puppet_linux57poc::group{ #使用realize函数实化组xiaonuo和root资源realize( Group['xiaonuo'],Group['root'] )
}

3. 测试

3.1 测试puppet模块（略）

3.2 测试puppet_linux57poc模块

3.2.1 查看当前系统是否有xiaonuo用户和组

[root@linux57poc puppet]# id xiaonuo
id: xiaonuo: No such user
[root@linux57poc puppet]# cat /etc/group | grep xiaonuo
[root@linux57poc puppet]#
[root@linux57poc puppet]# ll /etc/motd
-rwxrwxrwx 1 puppet puppet 313 Jan  2 06:17 /etc/motd

3.2.2 同步puppetmaster

[root@linux57poc puppet]# puppet agent -t --environment=testing
info: Retrieving plugin
info: Loading facts in /var/lib/puppet/lib/facter/fact_apply.rb
info: Caching catalog for puppet_linux57poc.dev.shanghaigm.com
info: Applying configuration version '1389555288'
notice: /Stage[main]/Allservice::Lm_sensors_service/Service[lm_sensors]/ensure: ensure changed 'running' to 'stopped'
notice: /Group[xiaonuo]/ensure: created
notice: /Stage[main]/Alluser::Xiaonuo/User[xiaonuo]/ensure: created
...
info: FileBucket adding {md5}b2090646c444c5ddf1533749743ebd71
info: /Stage[main]/Mcollective::Facter/File[/etc/mcollective/facts.yaml]: Filebucketed /etc/mcollective/facts.yaml to main with sum b2090646c444c5ddf1533749743ebd71
notice: /Stage[main]/Sysctl::Exec/Exec[sysctl -p >/dev/null &]/returns: executed successfully
notice: /Stage[main]/Puppet_linux57poc::Motd_config/File[/etc/motd]/owner: owner changed 'puppet' to 'xiaonuo'
notice: /Stage[main]/Puppet_linux57poc::Motd_config/File[/etc/motd]/group: group changed 'puppet' to 'root'
notice: /Stage[main]/Puppet_linux57poc::Motd_config/File[/etc/motd]/mode: mode changed '0777' to '0440'
notice: /Stage[main]/Allservice::Bluetooth_service/Service[bluetooth]/ensure: ensure changed 'running' to 'stopped'
notice: Finished catalog run in 4.54 seconds

3.2.3 验证结果是否正确

[root@linux57poc puppet]# id xiaonuo
uid=600(xiaonuo) gid=600(xiaonuo) groups=600(xiaonuo)
[root@linux57poc puppet]# cat /etc/group | grep xiaonuo
xiaonuo:x:600:
[root@linux57poc puppet]# ll /etc/motd
-r--r----- 1 xiaonuo root 313 Jan  2 06:17 /etc/motd
[root@linux57poc puppet]#