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:
[root@sh-proxy2local]#puppetdescribehosthost====Installsandmanageshostentries.Formostsystems,theseentrieswilljustbein`/etc/hosts`,butsomesystems(notablyOSX)willhavedifferentsolutions.Parameters-----------**comment**Acommentthatwillbeattachedtothelinewitha#character.-**ensure**Thebasicpropertythattheresourceshouldbein.Validvaluesare`present`,`absent`.-**host_aliases**Anyaliasesthehostmighthave.Multiplevaluesmustbespecifiedasanarray.-**ip**Thehost'sIPaddress,IPv4orIPv6.-**name**Thehostname.-**target**Thefileinwhichtostoreserviceinformation.Onlyusedbythoseprovidersthatwritetodisk.Onmostsystemsthisdefaultsto`/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.
classadmin{includeadmin::hostsexec{"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:
classadmin::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{"":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:
nodebase{includeadmin}node/sh-(proxy|web)\d+/inheritsbase{case$::hostname{/sh-proxy\d+/:{includenginx}"sh-web1":{includecron}}}
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.
[root@sh-proxy2local]#puppetagent-tInfo:RetrievingpluginfactsInfo:RetrievingpluginInfo:LoadingfactsInfo:Cachingcatalogforsh-proxy2.localdomainInfo:Applyingconfigurationversion'1507646562'Notice:/Stage[main]/Admin/Exec[selinux]/returns:executedsuccessfullyNotice:/Stage[main]/Admin::Hosts/Host[]/ensure:createdInfo:Computingchecksumonfile/etc/hostsNotice:Finishedcatalogrunin0.23seconds
[root@sh-proxy2local]#cat/etc/hosts#HEADER:ThisfilewasautogeneratedatTueOct1022:42:50+0800#HEADER:bypuppet.Whileitcanstillbemanagedmanually,it#HEADER:isdefinitelynotrecommended.127.0.0.1localhostlocalhost.localdomainlocalhost4localhost4.localdomain4::1localhostlocalhost.localdomainlocalhost6localhost6.localdomain6192.168.30.134puppet192.168.30.131sh-web1192.168.30.132sh-proxy2192.168.30.
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.
[root@sh-proxy2local]#puppetagent-tInfo:RetrievingpluginfactsInfo:RetrievingpluginInfo:LoadingfactsInfo:Cachingcatalogforsh-proxy2.localdomainInfo:Applyingconfigurationversion'1507646705'Notice:/Stage[main]/Admin/Exec[selinux]/returns:executedsuccessfullyNotice:/Stage[main]/Admin::Hosts/Host[]/host_aliases:defined'host_aliases'as'dbweb'Info:Computingchecksumonfile/etc/hostsNotice:Finishedcatalogrunin0.23seconds
[root@sh-proxy2local]#cat/etc/hosts#HEADER:ThisfilewasautogeneratedatTueOct1022:45:07+0800#HEADER:bypuppet.Whileitcanstillbemanagedmanually,it#HEADER:isdefinitelynotrecommended.127.0.0.1localhostlocalhost.localdomainlocalhost4localhost4.localdomain4::1localhostlocalhost.localdomainlocalhost6localhost6.localdomain6192.168.30.134puppet192.168.30.131sh-web1192.168.30.132sh-proxy2192.168.30.dbweb
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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