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.

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

This is equivalent to:

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

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':
  content => file("${module_name}/foo.service"),
  enable  => true,
  active  => true,
}

unit files from parameters

Create a unit file from parameters

systemd::manage_unit { 'myrunner.service':
  unit_entry    => {
    'Description' => 'My great service',
  },
  service_entry => {
    'Type'      => 'oneshot',
    'ExecStart' => '/usr/bin/doit.sh',
  },
  install_entry => {
    'WantedBy' => 'multi-user.target',
  },
  enable        => true,
  active        => true,
}

The parameters unit_entry, service_entry and install_entry populate the [Unit], [Service] and [Install] sections of the generated unit file.

Similarly units can be created from hiera yaml files

systemd::manage_units:
  myservice.service:
    unit_entry:
      Description: My Customisation
    service_entry:
      CPUWeight: 2000

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:

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

This is equivalent to:

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",
}
~> service { 'foo':
  ensure => 'running',
}

dropin-files can also be generated via hiera:

systemd::dropin_files:
  my-foo.conf:
    unit: foo.service
    source: puppet:///modules/${module_name}/foo.conf

drop-in files from parameters

systemd::manage_dropin { 'myconf.conf':
  ensure        => present,
  unit          => 'myservice.service',
  service_entry => {
    'Type'      => 'oneshot',
    'ExecStart' => ['', '/usr/bin/doit.sh'],
  },
}

Dropins can also be created similarly via yaml

systemd::manage_dropins:
  myconf.conf:
    ensure: present
    unit: myservice.service
    service_entry:
      Type: oneshot
      ExecStart:
        - ''
        - '/usr/bin/doit.sh'

The filename of the drop in. The full path is determined using the path, unit and this filename.

modules-load.d

Create a file entry for modules-loads directory and start systemd-modules-load.service

systemd::modules_load { 'impi.conf':
  content => "ipmi\n",
}

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']

timer units

Create a systemd timer unit and a systemd service unit to execute from that timer

The following will create a timer unit and a service unit file. When active and enable are set to true the puppet service runoften.timer will be declared, started and enabled.

systemd::timer { 'runoften.timer':
  timer_source   => "puppet:///modules/${module_name}/runoften.timer",
  service_source => "puppet:///modules/${module_name}/runoften.service",
  active         => true,
  enable         => true,
}

A trivial daily run. In this case enable and active are both unset and so the service daily.timer is not declared by the systemd::timer type.

$_timer = @(EOT)
[Timer]
OnCalendar=daily
RandomizedDelaySec=1d
EOT

$_service = @(EOT)
[Service]
Type=oneshot
ExecStart=/usr/bin/touch /tmp/file
EOT

systemd::timer { 'daily.timer':
  timer_content   => $_timer,
  service_content => $_service,
}

service { 'daily.timer':
  ensure    => running,
  subscribe => Systemd::Timer['daily.timer'],
}

If neither service_content or service_source are specified then no service unit will be created.

The service unit name can also be specified.

$_timer = @(EOT)
[Timer]
OnCalendar=daily
RandomizedDelaySec=1d
Unit=touch-me-today.service
EOT

$_service = @(EOT)
[Service]
Type=oneshot
ExecStart=/usr/bin/touch /tmp/file
EOT

systemd::timer { 'daily.timer':
  timer_content   => $_timer,
  service_unit    => 'touch-me-today.service',
  service_content => $_service,
  active          => true,
  enable          => true,
}

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",
}

machine-info (hostnamectl)

You can set elements of /etc/machine-info via the machine_info_settings parameter. These values are read by hostnamectl.

To manage these, you'll need to add an additional module, augeasproviders_shellvar, to your environment.

Daemon reloads

Systemd caches unit files and their relations. This means it needs to reload, typically done via systemctl daemon-reload. Since Puppet 6.1.0 (PUP-3483) takes care of this by calling systemctl show $SERVICE -- --property=NeedDaemonReload to determine if a reload is needed. Typically this works well and removes the need for systemd::systemctl::daemon_reload as provided prior to camptocamp/systemd 3.0.0. This avoids common circular dependencies.

It does contain a workaround for PUP-9473 but there's no guarantee that this works in every case.

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

The default target is managed via the default_target parameter. If this is left at its default value (undef), the default-target will be unmanaged by puppet.

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

class { 'systemd':
  manage_resolved  => true,
  manage_networkd  => true,
  manage_timesyncd => true,
  manage_journald  => true,
  manage_udevd     => true,
  manage_logind    => true,
  manage_coredump  => 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 use_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 introduced DNS Over TLS in release 239. Currently three states are supported yes (since systemd 243), opportunistic (true) and no (false, default). When enabled with yes or opportunistic systemd-resolved will start a TCP-session to a DNS server with DNS Over TLS support. When enabled with yes (strict mode), queries will fail if the configured DNS servers do not support DNS Over TLS. Note that there will be no host checking for DNS Over TLS due to missing implementation in systemd-resolved.

Stopping systemd-resolved once running can be problematic and care should be taken.

class { 'systemd':
  manage_resolved => true,
  resolved_ensure => false,
}

will stop the service and should also copy /run/systemd/resolve/resolv.conf to /etc/resolve.conf.

Writing your own file to /etc/resolv.conf is also possible.

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'],
}

when manage_systemd is true any required sub package, e.g. systemd-resolved on CentOS 9 or Debian 12, will be installed. However configuration of systemd-resolved will only occur on second puppet run after that installation.

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

udevd configuration

It allows you to manage the udevd configuration. You can set the udev.conf values via the udev_log, udev_children_max, udev_exec_delay, udev_event_timeout, udev_resolve_names, and udev_timeout_signal parameters.

Additionally you can set custom udev rules with the udev_rules parameter.

class { 'systemd':
  manage_udevd => true,
  udev_rules   => {
    'example_raw.rules' => {
      'rules' => [
        'ACTION=="add", KERNEL=="sda", RUN+="/bin/raw /dev/raw/raw1 %N"',
        'ACTION=="add", KERNEL=="sdb", RUN+="/bin/raw /dev/raw/raw2 %N"',
      ],
    },
  },
}

udev::rules configuration

Custom udev rules can be defined for specific events.

systemd::udev::rule:
  ensure: present
  path: /etc/udev/rules.d
  selinux_ignore_defaults: false
  notify: "Service[systemd-udevd']"
  rules:
    - 'ACTION=="add", KERNEL=="sda", RUN+="/bin/raw /dev/raw/raw1 %N"'
    - 'ACTION=="add", KERNEL=="sdb", RUN+="/bin/raw /dev/raw/raw2 %N"',

oomd configuration

The systemd-oomd system can be configured.

class { 'systemd':
  manage_oomd   => true,
  oomd_ensure   => 'running'
  oomd_settings => {
    'SwapUsedLimit'                    => '90%',
    'DefaultMemoryPressureLimit'       => '60%',
    'DefaultMemoryPressureDurationSec' => 30,
  }
}

coredump configuration

The systemd-coredump system can be configured.

class{'systemd':
  manage_coredump    => true,
  coredump_backtrace => true,
  coredump_settings  => {
    'Storage'         => 'external',
    'Compress'        => 'yes',
    'ProcessSizeMax'  => '2G',
    'ExternalSizeMax' => '10G',
    'JournalSizeMax'  => '20T',
    'MaxUse'          => '1E',
    'KeepFree'        => '1P',
  }
}

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

User linger

A loginctl_user resource is available to manage user linger enablement:

loginctl_user { 'foo':
  linger => enabled,
}

or as a hash via the systemd::loginctl_users parameter.

Systemd Escape Function

Partially escape strings as systemd-escape command does.

This functions only escapes a subset of chars. Non-ASCII character will not escape.

$result = systemd::escape('foo::bar/')

$result would be foo::bar-

or path escape as if with -p option.

$result = systemd::escape('/mnt/foobar/', true)

$result would be mnt-foobar.

Systemd Escape Function (uses systemd-escape)

Escape strings call the systemd-escape command in the background.

It's highly recommend running the function as deferred function since it executes the command on the agent.

$result = Deferred('systemd::systemd_escape', ["foo::bar"])