Puppet : How to use [service Resource]2023/08/10

	This is the examples for [service] resource.
[1]	It manages the configuration to keep [apache2] is running.

root@dlp:~#

vi /etc/puppet/code/environments/production/manifests/svc01.pp

service { 'apache2':
  name   => 'apache2',
  ensure => running,
}

[2]	It manages the configuration to keep [apache2] is running. However, if [apache2] is not installed, [apache2] can not start of course, so it manages the configuration to keep [apache2] is installed with [require] parameter like follows.

root@dlp:~#

vi /etc/puppet/code/environments/production/manifests/pkg01.pp

package { 'apache2':
  provider => apt,
  ensure   => installed,
}

root@dlp:~#

vi /etc/puppet/code/environments/production/manifests/svc01.pp

service { 'apache2':
  name    => 'apache2',
  ensure  => running,
  require => Package['apache2'],
}

[3]	It manages the configuration to keep Nginx is not running. If running, it stops.

root@dlp:~#

vi /etc/puppet/code/environments/production/manifests/svc02.pp

service { 'nginx':
  name   => 'nginx',
  ensure => stopped,
}

[4]	It restarts [apache2] when the file [/etc/apache2/conf-available/security.conf] is updated.

root@dlp:~#

vi /etc/puppet/code/environments/production/manifests/svc03.pp

file { '/etc/apache2/conf-available/security.conf':
  ensure => file,
  owner  => 'root',
  group  => 'root',
  mode   => '0644',
  source => 'puppet://dlp.srv.world/extra_files/security.conf',
  notify => Service['apache2'],
}

root@dlp:~#

vi /etc/puppet/files/security.conf

ServerTokens Prod
ServerSignature On
TraceEnable Off

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