exec資源:

主要功能調用系統命令,完成系統管理的基礎操作.

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exec?{?'resource?title': ??command?????=>?#?(namevar)?The?actual?command?to?execute.??Must?either?be... ??creates?????=>?#?A?file?to?look?for?before?running?the?command... ??cwd?????????=>?#?The?directory?from?which?to?run?the?command.??If? ??environment?=>?#?Any?additional?environment?variables?you?want?to? ??group???????=>?#?The?group?to?run?the?command?as.??This?seems?to... ??logoutput???=>?#?Whether?to?log?command?output?in?addition?to... ??onlyif??????=>?#?A?test?command?that?checks?the?state?of?the... ??path????????=>?#?The?search?path?used?for?command?execution... ??provider????=>?#?The?specific?backend?to?use?for?this?`exec... ??refresh?????=>?#?An?alternate?command?to?run?when?the?`exec... ??refreshonly?=>?#?The?command?should?only?be?run?as?a?refresh... ??returns?????=>?#?The?expected?exit?code(s).??An?error?will?be... ??timeout?????=>?#?The?maximum?time?the?command?should?take.??If... ??tries???????=>?#?The?number?of?times?execution?of?the?command... ??try_sleep???=>?#?The?time?to?sleep?in?seconds?between... ??umask???????=>?#?Sets?the?umask?to?be?used?while?executing?this... ??unless??????=>?#?A?test?command?that?checks?the?state?of?the... ??user????????=>?#?The?user?to?run?the?command?as.??Note?that?if... ??#?...plus?any?applicable?metaparameters. }

參數解釋:

command:指定要執(zhí)行的系統命令,必須為被執(zhí)行命令的絕對路徑.

creates:此參數會創(chuàng)建一個臨時文件,當此臨時文件不存在時exec調用系統命令才會執(zhí)行成功,防止出現同一時刻多次執(zhí)行的情況.

cwd：系統命令執(zhí)行的路徑,指定目錄不存在,命令執(zhí)行將會失敗.

environment:添加系統命令的附加環(huán)境變量,也可以加入自己的path環(huán)境變量來覆蓋系統的環(huán)境變量.添加多個環(huán)境變量需要使用數組指定.

group:執(zhí)行命令運行的賬戶組.

logoutput：決定是否記錄輸出日志信息.默認會根據exec資源的日志等級來記錄輸出信息,使用on_failure時只有命令執(zhí)行有誤的情況下才會記錄輸出信息.值可以為true、false、on_failure和任何合法的日志等級.

onlyif：只有onlyif指定命令執(zhí)行返回結果為0的時候,命令才會執(zhí)行.

path:命令執(zhí)行的搜索路徑,如果path沒有定義，命令使用絕對路徑,路徑可以以數組或以冒號分割的形式來定義.

refresh：刷新命令執(zhí)行狀態(tài).

refreshonly:作為1個更新機制,當依賴的對象改變時命令才會執(zhí)行.exec資源通過subscribe和refreshonly監(jiān)聽到依賴文件的狀態(tài)，則出發(fā)exec資源的執(zhí)行.

returns:指定預期的返回碼,如果執(zhí)行的命令返回其他的代碼將會出現錯誤,默認是0，可以指定一個單一的值也可以指定一個包含多個值的數組.

timeout:指定命令運行的超時時間,單位為秒,如果命令執(zhí)行的時間超過了timeout設定的時間,就會認為命令執(zhí)行失敗并且會停止該命令.設置為0表示沒有超時的限制.

tries:命令執(zhí)行重試次數,默認為1.設置這個值之后會重試設置的次數知道正確的代碼返回.

try_sleep：設置命令重試的時間間隔,單位是秒.

user:指定執(zhí)行命令的賬戶.

provider:目前支持posix標準、shell和windows.

示例一:

修改selinux的值.

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exec?{"selinux": ????command?=>?"sed?-i?'/^SELINUX=/s/=.*/=disabled/g'?/etc/sysconfig/selinux", ????path?=>?["/bin/","/sbin/","/usr/bin/","/usr/sbin/"], ????user?=>?root, ????group?=>?root, }

示例二:

訂閱haproxy.cfg文件發(fā)生變化就重啟haproxy服務：

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class?haproxy?{ ????include?haproxy::service } 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', ????} }

agent運行結果:

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[root@sh-web1?haproxy]#?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?'1508344014' Notice:?/Stage[main]/Haproxy::Service/File[/etc/haproxy/haproxy.cfg]/content:? ---?/etc/haproxy/haproxy.cfg2017-10-19?00:19:21.116720774?+0800 +++?/tmp/puppet-file20171019-127476-1tpjcag-02017-10-19?00:26:55.400720142?+0800 @@?-1,86?+1,86?@@ -#--------------------------------------------------------------------- -#?Example?configuration?for?a?possible?web?application.??See?the -#?full?configuration?options?online. -# -#???http://haproxy.1wt.eu/download/1.4/doc/configuration.txt -# -#--------------------------------------------------------------------- - -#--------------------------------------------------------------------- -#?Global?settings -#--------------------------------------------------------------------- -global -????#?to?have?these?messages?end?up?in?/var/log/haproxy.log?you?will -????#?need?to: -????# -????#?1)?configure?syslog?to?accept?network?log?events.??This?is?done -????#????by?adding?the?'-r'?option?to?the?SYSLOGD_OPTIONS?in -????#????/etc/sysconfig/syslog -????# -????#?2)?configure?local2?events?to?go?to?the?/var/log/haproxy.log -????#???file.?A?line?like?the?following?can?be?added?to -????#???/etc/sysconfig/syslog -????# -????#????local2.*???????????????????????/var/log/haproxy.log -????# -????log?????????127.0.0.1?local2 - -????chroot??????/var/lib/haproxy -????pidfile?????/var/run/haproxy.pid -????maxconn?????4000 -????user????????haproxy -????group???????haproxy -????daemon - -????#?turn?on?stats?unix?socket -????stats?socket?/var/lib/haproxy/stats - -#--------------------------------------------------------------------- -#?common?defaults?that?all?the?'listen'?and?'backend'?sections?will -#?use?if?not?designated?in?their?block -#--------------------------------------------------------------------- -defaults -????mode????????????????????http -????log?????????????????????global -????option??????????????????httplog -????option??????????????????dontlognull -????option?http-server-close -????option?forwardfor???????except?127.0.0.0/8 -????option??????????????????redispatch -????retries?????????????????5 -????timeout?http-request????10s -????timeout?queue???????????1m -????timeout?connect?????????10s -????timeout?client??????????1m -????timeout?server??????????1m -????timeout?http-keep-alive?10s -????timeout?check???????????10s -????maxconn?????????????????3000 - -#--------------------------------------------------------------------- -#?main?frontend?which?proxys?to?the?backends -#--------------------------------------------------------------------- -frontend??main?*:5000 -????acl?url_static???????path_beg???????-i?/static?/images?/javascript?/stylesheets -????acl?url_static???????path_end???????-i?.jpg?.gif?.png?.css?.js - -????use_backend?static??????????if?url_static -????default_backend?????????????app - -#--------------------------------------------------------------------- -#?static?backend?for?serving?up?images,?stylesheets?and?such -#--------------------------------------------------------------------- -backend?static -????balance?????roundrobin -????server??????static?127.0.0.1:4331?check - -#--------------------------------------------------------------------- -#?round?robin?balancing?between?the?various?backends -#--------------------------------------------------------------------- -backend?app -????balance?????roundrobin -????server??app1?127.0.0.1:5001?check -????server??app2?127.0.0.1:5002?check -????server??app3?127.0.0.1:5003?check -????server??app4?127.0.0.1:5004?check - +#--------------------------------------------------------------------- +#?Example?configuration?for?a?possible?web?application.??See?the +#?full?configuration?options?online. +# +#???http://haproxy.1wt.eu/download/1.4/doc/configuration.txt +# +#--------------------------------------------------------------------- + +#--------------------------------------------------------------------- +#?Global?settings +#--------------------------------------------------------------------- +global +????#?to?have?these?messages?end?up?in?/var/log/haproxy.log?you?will +????#?need?to: +????# +????#?1)?configure?syslog?to?accept?network?log?events.??This?is?done +????#????by?adding?the?'-r'?option?to?the?SYSLOGD_OPTIONS?in +????#????/etc/sysconfig/syslog +????# +????#?2)?configure?local2?events?to?go?to?the?/var/log/haproxy.log +????#???file.?A?line?like?the?following?can?be?added?to +????#???/etc/sysconfig/syslog +????# +????#????local2.*???????????????????????/var/log/haproxy.log +????# +????log?????????127.0.0.1?local2 + +????chroot??????/var/lib/haproxy +????pidfile?????/var/run/haproxy.pid +????maxconn?????4000 +????user????????haproxy +????group???????haproxy +????daemon + +????#?turn?on?stats?unix?socket +????stats?socket?/var/lib/haproxy/stats + +#--------------------------------------------------------------------- +#?common?defaults?that?all?the?'listen'?and?'backend'?sections?will +#?use?if?not?designated?in?their?block +#--------------------------------------------------------------------- +defaults +????mode????????????????????http +????log?????????????????????global +????option??????????????????httplog +????option??????????????????dontlognull +????option?http-server-close +????option?forwardfor???????except?127.0.0.0/8 +????option??????????????????redispatch +????retries?????????????????3 +????timeout?http-request????10s +????timeout?queue???????????1m +????timeout?connect?????????10s +????timeout?client??????????1m +????timeout?server??????????1m +????timeout?http-keep-alive?10s +????timeout?check???????????10s +????maxconn?????????????????3000 + +#--------------------------------------------------------------------- +#?main?frontend?which?proxys?to?the?backends +#--------------------------------------------------------------------- +frontend??main?*:5000 +????acl?url_static???????path_beg???????-i?/static?/images?/javascript?/stylesheets +????acl?url_static???????path_end???????-i?.jpg?.gif?.png?.css?.js + +????use_backend?static??????????if?url_static +????default_backend?????????????app + +#--------------------------------------------------------------------- +#?static?backend?for?serving?up?images,?stylesheets?and?such +#--------------------------------------------------------------------- +backend?static +????balance?????roundrobin +????server??????static?127.0.0.1:4331?check + +#--------------------------------------------------------------------- +#?round?robin?balancing?between?the?various?backends +#--------------------------------------------------------------------- +backend?app +????balance?????roundrobin +????server??app1?127.0.0.1:5001?check +????server??app2?127.0.0.1:5002?check +????server??app3?127.0.0.1:5003?check +????server??app4?127.0.0.1:5004?check + Info:?Computing?checksum?on?file?/etc/haproxy/haproxy.cfg Info:?/Stage[main]/Haproxy::Service/File[/etc/haproxy/haproxy.cfg]:?Filebucketed?/etc/haproxy/haproxy.cfg?to?puppet?with?sum?395150f853e91c149a7b18753c09a274 Notice:?/Stage[main]/Haproxy::Service/File[/etc/haproxy/haproxy.cfg]/content:?content?changed?'{md5}395150f853e91c149a7b18753c09a274'?to?'{md5}034aa86fec81774e5f81c691df0d92a3' Info:?/Stage[main]/Haproxy::Service/File[/etc/haproxy/haproxy.cfg]:?Scheduling?refresh?of?Exec[/etc/init.d/haproxy?restart] Notice:?/Stage[main]/Haproxy::Service/Exec[/etc/init.d/haproxy?restart]:?Triggered?'refresh'?from?1?events Notice:?/Stage[main]/Admin/Exec[selinux]/returns:?executed?successfully Notice:?Finished?catalog?run?in?0.59?seconds

注意:puppet文件中改變一個參數的值更新,發(fā)現已經觸發(fā)重啟命令.

本文轉自青衫解衣 51CTO博客，原文鏈接:http://blog.51cto.com/215687833/1974214

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