目前puppet2.7以上版本都支持if...elif ...else...、selecter和case语句.它们的条件判断分为两类:一类为条件执行(if...elif ...else...、selecter)通过逻辑判断来选择要执行的特定代码或加载代码;另一类(case)是循环执行类,依照代码规则来执行代码或加载代码.
if条件判断语句:
示例一:
if判断系统发行版本安装apache软件包:
|
1
2
3
4
5
6
7
8
9
10
11
|
[root@sh-web1 ~]
# cat apache.pp
if
$operatingsystem ==
'CentOS'
{
$packages =
'httpd'
} elsif $operatingsystem ==
'Redhat'
{
$packages =
'httpd'
}
else
{
$packages =
'apache2'
}
package {
"$packages"
:
ensure=>
"present"
,
}
|
本地应用puppet代码:
|
1
2
3
4
|
[root@sh-web1 ~]
# puppet apply apache.pp
Notice: Compiled catalog
for
sh-web1.localdomain
in
environment production
in
0.04 seconds
Notice:
/Stage
[main]
/Main/Package
[httpd]
/ensure
: created
Notice: Finished catalog run
in
1.78 seconds
|
注意:"=="是等于的意思，完完全全匹配到对应的.
示例二:
if匹配hostname主机载入相应的puppet模块.(if在node.pp文件中匹配主机很少用,几乎都是用case.)
|
1
2
3
4
5
6
7
8
9
10
11
12
|
node base {
include admin
}
node
/sh-
(proxy|web)\d+/ inherits base {
if
$
hostname
=~
/sh-proxy
\d+/ {
include apache
} elsif $
hostname
=~
/sh-web
\d+/ {
include php
}
else
{
include nginx::nginxconf
}
}
|
agent端更新puppet代码.
|
1
2
3
4
5
6
7
8
9
10
11
|
[root@sh-proxy2 ~]
# puppet agent -t
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Loading facts
Info: Caching catalog
for
sh-proxy2.localdomain
Info: Applying configuration version
'1506450177'
Notice:
/Stage
[main]
/Admin/Exec
[selinux]
/returns
: executed successfully
Notice:
/Stage
[main]
/Install/Package
[httpd]
/ensure
: created
Notice:
/Stage
[main]
/Service/Service
[httpd]
/ensure
: ensure changed
'stopped'
to
'running'
Info:
/Service
[httpd]: Unscheduling refresh on Service[httpd]
Notice: Finished catalog run
in
20.24 seconds
|
agent端更新puppet代码.
|
1
2
3
4
5
6
7
8
9
10
11
|
[root@sh-web1 ~]
# 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
'1506450177'
Notice:
/Stage
[main]
/Admin/Exec
[selinux]
/returns
: executed successfully
Notice:
/Stage
[main]
/Php/Package
[php]
/ensure
: created
Notice:
/Stage
[main]
/Php/Package
[php-devel]
/ensure
: created
Notice: Finished catalog run
in
4.01 seconds
|
注意:"=~"是匹配的意思，只要匹配到就行.
case语句应用:
示例:(之前文章一直都在用的匹配方法case)
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
node base {
include admin
}
node
/sh-
(proxy|web)\d+/ inherits base {
case
$::
hostname
{
/sh-proxy
\d+/: {
include apache
}
"sh-web1"
: {
include nginx::nginxconf
include php
}
}
}
|
agent端更新就不演示了,上面的case语句博客开始就是这样写的.
本文转自青衫解衣 51CTO博客，原文链接:http://blog.51cto.com/215687833/1969088
