Puppet公有资源属性(二十九)
puppet公有资源的用途:puppet将资源完成任务与否的结果看为状态,正是这种特性让我们可以通过资源公有属性来建立与资源的关系,当建立了资源关联关系后，前者资源状态未成功时，后者资源可以通过资源共有属性来确认其最终执行结果,这就是公有资源属性的用途.
常用的公有资源:
before/require:定义资源的先后顺序,除此之外还有"->".
require:资源依赖，自身资源依赖哪个资源。
before:自身资源在哪个资源之前使用.
notify/subscribe:通知订阅.
notify:通知，自身发生改变通知remote资源
subcribe:订阅，当远程remote资源改变，自身做刷新操作
示例一:
以安装、启动httpd服务为例,puppet代码如下:
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# cat httpd.pp
package {"httpd":
ensure => present,
provider => 'yum',
}
service {"httpd":
ensure => running,
enable => true,
}
注释:希望的结果是先安装httpd软件包，再启动httpd服务.
运行结果如下:
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# puppet apply httpd.pp
Notice: Compiled catalog for sh-web1.localdomain in environment production in 0.04 seconds
Error: Could not start Service: Execution of '/sbin/service httpd start' returned 1: httpd: unrecognized service
Error: /Stage/Main/Service/ensure: change from stopped to running failed: Could not start Service: Execution of '/sbin/service httpd start' returned 1: httpd: unrecognized service
Notice: /Stage/Main/Package/ensure: created
Notice: Finished catalog run in 3.71 seconds
# rpm -qa httpd
httpd-2.2.15-60.el6.centos.6.x86_64
# /etc/init.d/httpd status
httpd is stopped
注释:可以看到puppet代码运行过程中先启动了httpd服务，然后再安装的httpd包,顺序并非所希望的那样运行.
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示例二:
引入资源的公有属性require和before属性.
引入require的puppet代码:
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# cat httpd.pp
package {"httpd":
ensure => present,
provider => 'yum',
}
service {"httpd":
ensure => running,
enable => true,
require => Package['httpd'],
}
运行结果如下:
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# puppet apply httpd.pp
Notice: Compiled catalog for sh-web1.localdomain in environment production in 0.04 seconds
Notice: /Stage/Main/Package/ensure: created
Notice: /Stage/Main/Service/ensure: ensure changed 'stopped' to 'running'
Notice: Finished catalog run in 1.83 seconds
# rpm -qa httpd
httpd-2.2.15-60.el6.centos.6.x86_64
# /etc/init.d/httpd status
httpd (pid14413) is running...
---------------------------------------------------------------------------------------------
引入before资源的puppet代码:
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# cat httpd.pp
package {"httpd":
ensure => present,
provider => 'yum',
before => Service['httpd'],
}
service {"httpd":
ensure => running,
enable => true,
}
运行的结果如下:
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# puppet apply httpd.pp
Notice: Compiled catalog for sh-web1.localdomain in environment production in 0.05 seconds
Notice: /Stage/Main/Package/ensure: created
Notice: /Stage/Main/Service/ensure: ensure changed 'stopped' to 'running'
Notice: Finished catalog run in 2.14 seconds
# rpm -qa httpd
httpd-2.2.15-60.el6.centos.6.x86_64
# /etc/init.d/httpd status
httpd (pid14665) is running...
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示例三:
之前的文档写过exec示例时有subcribe参数，刚好拿来使用.
引入notify/subscribe公有资源:
改变haproxy的timeout的值，使用puppet的subcribe订阅功能的代码如下:
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class haproxy::service {
file {'/etc/haproxy/haproxy.cfg':
ensure => present,
source => 'puppet:///modules/haproxy/haproxy.cfg',
}
exec {"/etc/init.d/haproxy restart":
path => ['/sbin','/bin',],
command => 'service haproxy restart',
subscribe => File['/etc/haproxy/haproxy.cfg'],
timeout => '5',
refreshonly => true,
tries => '2',
try_sleep => '3',
}
}
运行结果如下:
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# 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 '1509023682'
Notice: /Stage/Haproxy::Service/File/content:
--- /etc/haproxy/haproxy.cfg2017-10-19 00:26:55.535720143 +0800
+++ /tmp/puppet-file20171026-15120-3hpwyh-02017-10-26 14:04:57.471321465 +0800
@@ -50,7 +50,7 @@
retries 3
timeout http-request 10s
timeout queue 1m
- timeout connect 10s
+ timeout connect 20s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
Info: Computing checksum on file /etc/haproxy/haproxy.cfg
Info: /Stage/Haproxy::Service/File: Filebucketed /etc/haproxy/haproxy.cfg to puppet with sum 034aa86fec81774e5f81c691df0d92a3
Notice: /Stage/Haproxy::Service/File/content: content changed '{md5}034aa86fec81774e5f81c691df0d92a3' to '{md5}d94dac291f5d754ea13c2799f0c065c7'
Info: /Stage/Haproxy::Service/File: Scheduling refresh of Exec
Notice: /Stage/Haproxy::Service/Exec: Triggered 'refresh' from 1 events
Notice: /Stage/Admin/Exec/returns: executed successfully
Notice: Finished catalog run in 0.57 seconds
注释:当haprxoy的/etc/haproxy/haproxy.cfg发生改变是就会重启服务.
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引入puppet公有资源属性notify主动通知功能的puppet代码:
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class haproxy::service {
file {'/etc/haproxy/haproxy.cfg':
ensure => present,
source => 'puppet:///modules/haproxy/haproxy.cfg',
notify => Exec['/etc/init.d/haproxy restart'],
}
exec {"/etc/init.d/haproxy restart":
path => ['/sbin','/bin',],
command => 'service haproxy restart',
timeout => '5',
refreshonly => true,
tries => '2',
try_sleep => '3',
}
}
运行结果如下:
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# 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 '1509027044'
Notice: /Stage/Haproxy::Service/File/content:
--- /etc/haproxy/haproxy.cfg2017-10-26 14:04:57.538321466 +0800
+++ /tmp/puppet-file20171026-15376-1fnh0f2-02017-10-26 14:10:44.544847207 +0800
@@ -50,7 +50,7 @@
retries 3
timeout http-request 10s
timeout queue 1m
- timeout connect 20s
+ timeout connect 30s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
Info: Computing checksum on file /etc/haproxy/haproxy.cfg
Info: /Stage/Haproxy::Service/File: Filebucketed /etc/haproxy/haproxy.cfg to puppet with sum d94dac291f5d754ea13c2799f0c065c7
Notice: /Stage/Haproxy::Service/File/content: content changed '{md5}d94dac291f5d754ea13c2799f0c065c7' to '{md5}d5baea01fcfcb635dec5737a4ae67a3f'
Info: /Stage/Haproxy::Service/File: Scheduling refresh of Exec
Notice: /Stage/Haproxy::Service/Exec: Triggered 'refresh' from 1 events
Notice: /Stage/Admin/Exec/returns: executed successfully
Notice: Finished catalog run in 0.65 seconds
注释:/etc/haproxy/haproxy.cfg文件发生变化,puppet主动去推的exec执行.
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