Systemd

Overview

This module declares exec resources to create global sync points for reloading systemd.

Version 2 and newer of the module don't work with Hiera 3! You need to migrate your existing Hiera setup to Hiera 5

Usage and examples

There are two ways to use this module.

unit files

Let this module handle file creation and systemd reloading.

systemd::unit_file { 'foo.service':
 source => "puppet:///modules/${module_name}/foo.service",
}
~> service {'foo':
  ensure => 'running',
}

Or handle file creation yourself and trigger systemd.

include systemd::systemctl::daemon_reload

file { '/usr/lib/systemd/system/foo.service':
  ensure => file,
  owner  => 'root',
  group  => 'root',
  mode   => '0644',
  source => "puppet:///modules/${module_name}/foo.service",
}
~> Class['systemd::systemctl::daemon_reload']

service {'foo':
  ensure    => 'running',
  subscribe => File['/usr/lib/systemd/system/foo.service'],
}

You can also use this module to more fully manage the new unit. This example deploys the unit, reloads systemd and then enables and starts it.

systemd::unit_file { 'foo.service':
 source => "puppet:///modules/${module_name}/foo.service",
 enable => true,
 active => true,
}

drop-in files

Drop-in files are used to add or alter settings of a unit without modifying the unit itself. As for the unit files, the module can handle the file and directory creation and systemd reloading:

systemd::dropin_file { 'foo.conf':
  unit   => 'foo.service',
  source => "puppet:///modules/${module_name}/foo.conf",
}
~> service {'foo':
  ensure    => 'running',
}

Or handle file and directory creation yourself and trigger systemd:

include systemd::systemctl::daemon_reload

file { '/etc/systemd/system/foo.service.d':
  ensure => directory,
  owner  => 'root',
  group  => 'root',
}

file { '/etc/systemd/system/foo.service.d/foo.conf':
  ensure => file,
  owner  => 'root',
  group  => 'root',
  mode   => '0644',
  source => "puppet:///modules/${module_name}/foo.conf",
}
~> Class['systemd::systemctl::daemon_reload']

service {'foo':
  ensure    => 'running',
  subscribe => File['/etc/systemd/system/foo.service.d/foo.conf'],
}

Sometimes it's desirable to reload the systemctl daemon before a service is refreshed (for example: when overriding ExecStart or adding environment variables to the drop-in file). In that case, use daemon_reload => 'eager' instead of the default 'lazy'. Be aware that the daemon could be reloaded multiple times if you have multiple systemd::dropin_file resources and any one of them is using 'eager'.

tmpfiles

Let this module handle file creation and systemd reloading

systemd::tmpfile { 'foo.conf':
  source => "puppet:///modules/${module_name}/foo.conf",
}

Or handle file creation yourself and trigger systemd.

include systemd::tmpfiles

file { '/etc/tmpfiles.d/foo.conf':
  ensure => file,
  owner  => 'root',
  group  => 'root',
  mode   => '0644',
  source => "puppet:///modules/${module_name}/foo.conf",
}
~> Class['systemd::tmpfiles']

service limits

Manage soft and hard limits on various resources for executed processes.

systemd::service_limits { 'foo.service':
  limits => {
    'LimitNOFILE' => 8192,
    'LimitNPROC'  => 16384,
  }
}

Or provide the configuration file yourself. Systemd reloading and restarting of the service are handled by the module.

systemd::service_limits { 'foo.service':
  source => "puppet:///modules/${module_name}/foo.conf",
}

network

systemd-networkd is able to manage your network configuration. We provide a defined resource which can write the interface configurations. systemd-networkd needs to be restarted to apply the configs. The defined resource can do this for you:

systemd::network{'eth0.network':
  source          => "puppet:///modules/${module_name}/eth0.network",
  restart_service => true,
}

Services

Systemd provides multiple services. Currently you can manage systemd-resolved, systemd-timesyncd, systemd-networkd, systemd-journald and systemd-logind via the main class:

class{'systemd':
  manage_resolved  => true,
  manage_networkd  => true,
  manage_timesyncd => true,
  manage_journald  => true,
  manage_logind    => true,
}

$manage_networkd is required if you want to reload it for new systemd::network resources. Setting $manage_resolved will also manage your /etc/resolv.conf.

When configuring systemd::resolved you could set dns_stub_resolver to false (default) to use a standard /etc/resolved.conf, or you could set it to true to use the local resolver provided by systemd-resolved.

Systemd has introduced DNS Over TLS in the release 239. Currently two states are supported no and opportunistic. When enabled with opportunistic systemd-resolved will start a TCP-session to a DNS server with DNS Over TLS support. Note that there will be no host checking for DNS Over TLS due to missing implementation in systemd-resolved.

It is possible to configure the default ntp servers in /etc/systemd/timesyncd.conf:

class{'systemd':
  manage_timesyncd    => true,
  ntp_server          => ['0.pool.ntp.org', '1.pool.ntp.org'],
  fallback_ntp_server => ['2.pool.ntp.org', '3.pool.ntp.org'],
}

This requires puppetlabs-inifile, which is only a soft dependency in this module (you need to explicitly install it). Both parameters accept a string or an array.

Resource Accounting

Systemd has support for different accounting option. It can track CPU/Memory/Network stats per process. This is explained in depth at systemd-system.conf. This defaults to off (default on most operating systems). You can enable this with the $manage_accounting parameter. The module provides a default set of working accounting options per operating system, but you can still modify them with $accounting:

class{'systemd':
  manage_accounting => true,
  accounting        => {
    'DefaultCPUAccounting'    => 'yes',
    'DefaultMemoryAccounting' => 'no',
  }
}

journald configuration

It also allows you to manage journald settings. You can manage journald settings through setting the journald_settings parameter. If you want a parameter to be removed, you can pass its value as params.

systemd::journald_settings:
  Storage: auto
  MaxRetentionSec: 5day
  MaxLevelStore:
    ensure: absent

logind configuration

It also allows you to manage logind settings. You can manage logind settings through setting the logind_settings parameter. If you want a parameter to be removed, you can pass its value as params.

systemd::logind_settings:
  HandleSuspendKey: 'ignore'
  KillUserProcesses: 'no'
  RemoveIPC:
    ensure: absent
  UserTasksMax: 10000