The Misadventures of Penoi

Replace file in Puppet only if the file exists. So i have this question from my colleague. It sounds simple right? but it is not.

Some says that use exec with onlyif but it produces warning/errors logs if the file doesn't exist. In which functionality, it will suffice your needs, but you will have this warning logs.

This is the workaround that i've done:

file { '/tmp/file01.txt':    source => "puppet:///modules/common/custommodule/file01.txt",    owner => 'root',    group => 'root',    mode => '0640',  }

  exec {"copy_file01":    command => "/usr/bin/diff /tmp/file01.txt /var/tmp/file01.txt; if [ $? -ne 0 ]; then /bin/cp /tmp/file01.txt /var/tmp/file01.txt; fi",     require=> File['/tmp/file01.txt'],    onlyif => "/usr/bin/test -e /var/tmp/file01.txt",
  }

Devops Singapore Meetup Puppet in production session

Here's an example of a simple manifest file that will install a package (ex. apache) and will ensure that that the service was started after install

package {'httpd':
   ensure => installed,
    source => '/var/tmp/httpd-2.2.3-53.el5.centos.i386.rpm',
}

service {'httpd':
   ensure     => running,
   enable     => true,
   hasstatus  => true,
   hasrestart => true,
}

Seems legit. Let's apply the manifest

[root@learn tmp]# puppet apply httpd.install.pp
err: /Stage[main]//Service[httpd]/ensure: change from stopped to running failed: Could not start Service[httpd]: Execution of '/sbin/service httpd start' returned 1:  at /var/tmp/httpd.install.pp:11
notice: /Stage[main]//Package[httpd]/ensure: created
notice: Finished catalog run in 31.04 seconds

hmmm.. it seems that puppet was starting the service before the install. Let's modify the file

package { 'httpd':
ensure => installed,
source => '/var/tmp/httpd-2.2.3-53.el5.centos.i386.rpm',
}

service { 'httpd':
require => Package['httpd'],
ensure => running,
enable => true,
hasstatus => true,
hasrestart => true,
}

Now let's apply the new manifest file

[root@learn tmp]# puppet apply httpd.install.pp
notice: /Stage[main]//Package[httpd]/ensure: created
notice: /Stage[main]//Service[httpd]/ensure: ensure changed 'stopped' to 'running'
notice: Finished catalog run in 34.10 seconds

[root@learn tmp]# chkconfig --list |grep httpd
httpd           0:off   1:off   2:on    3:on    4:on    5:on    6:off
pe-httpd        0:off   1:off   2:on    3:on    4:on    5:on    6:off

[root@learn tmp]# rpm -qa |grep httpd
pe-httpd-2.2.3-17.pe.el5
pe-httpd-passenger-2.2.11-11.pe.el5
httpd-2.2.3-63.el5.centos.1
[root@learn tmp]# service httpd status
httpd (pid  15355) is running...

Disclaimer: im still a puppetlabs newbie. :)