Config::Model::models::Systemd::Section::Unit - Configuration class Systemd::Section::Unit
Configuration classes used by Config::Model
A unit configuration file encodes information about a service, a socket, a device, a mount point, an automount point, a swap file or partition, a start-up target, a watched file system path, a timer controlled and supervised by systemd(1), a resource management slice or a group of externally created processes. The syntax is inspired by XDG Desktop Entry Specification .desktop files, which are in turn inspired by Microsoft Windows .ini files.
This man page lists the common configuration options of all the unit types. These options need to be configured in the [Unit] or [Install] sections of the unit files.
In addition to the generic [Unit] and [Install] sections described here, each unit may have a type-specific section, e.g. [Service] for a service unit. See the respective man pages for more information: systemd.service(5), systemd.socket(5), systemd.device(5), systemd.mount(5), systemd.automount(5), systemd.swap(5), systemd.target(5), systemd.path(5), systemd.timer(5), systemd.slice(5), systemd.scope(5).
Various settings are allowed to be specified more than once, in which case the interpretation depends on the setting. Often, multiple settings form a list, and setting to an empty value "resets", which means that previous assignments are ignored. When this is allowed, it is mentioned in the description of the setting. Note that using multiple assignments to the same value makes the unit file incompatible with parsers for the XDG .desktop file format.
Unit files are loaded from a set of paths determined during compilation, described in the next section.
Unit files may contain additional options on top of those listed here. If systemd encounters an unknown option, it will write a warning log message but continue loading the unit. If an option or section name is prefixed with X-, it is ignored completely by systemd. Options within an ignored section do not need the prefix. Applications may use this to include additional information in the unit files.
X-
Boolean arguments used in unit files can be written in various formats. For positive settings the strings 1, yes, true and on are equivalent. For negative settings, the strings 0, no, false and off are equivalent.
1
yes
true
on
0
no
false
off
Time span values encoded in unit files can be written in various formats. A stand-alone number specifies a time in seconds. If suffixed with a time unit, the unit is honored. A concatenation of multiple values with units is supported, in which case the values are added up. Example: 50 refers to 50 seconds; 2min 200ms refers to 2 minutes and 200 milliseconds, i.e. 120200 ms. The following time units are understood: s, min, h, d, w, ms, us. For details see systemd.time(7).
50
2min 200ms
s
min
h
d
w
ms
us
Empty lines and lines starting with # or ; are ignored. This may be used for commenting. Lines ending in a backslash are concatenated with the following line while reading and the backslash is replaced by a space character. This may be used to wrap long lines.
#
;
Units can be aliased (have an alternative name), by creating a symlink from the new name to the existing name in one of the unit search paths. For example, systemd-networkd.service has the alias dbus-org.freedesktop.network1.service, created during installation as the symlink /usr/lib/systemd/system/dbus-org.freedesktop.network1.service. In addition, unit files may specify aliases through the Alias directive in the [Install] section; those aliases are only effective when the unit is enabled. When the unit is enabled, symlinks will be created for those names, and removed when the unit is disabled. For example, reboot.target specifies Alias=ctrl-alt-del.target, so when enabled it will be invoked whenever CTRL+ALT+DEL is pressed. Alias names may be used in commands like enable, disable, start, stop, status, …, and in unit dependency directives Wants, Requires, Before, After, …, with the limitation that aliases specified through Alias are only effective when the unit is enabled. Aliases cannot be used with the preset command.
Alias
Alias=ctrl-alt-del.target
Wants
Requires
Before
After
Along with a unit file foo.service, the directory foo.service.wants/ may exist. All unit files symlinked from such a directory are implicitly added as dependencies of type Wants to the unit. This is useful to hook units into the start-up of other units, without having to modify their unit files. For details about the semantics of Wants, see below. The preferred way to create symlinks in the .wants/ directory of a unit file is with the enable command of the systemctl(1) tool which reads information from the [Install] section of unit files (see below). A similar functionality exists for Requires type dependencies as well, the directory suffix is .requires/ in this case.
Along with a unit file foo.service, a "drop-in" directory foo.service.d/ may exist. All files with the suffix .conf from this directory will be parsed after the file itself is parsed. This is useful to alter or add configuration settings for a unit, without having to modify unit files. Each drop-in file must have appropriate section headers. Note that for instantiated units, this logic will first look for the instance .d/ subdirectory and read its .conf files, followed by the template .d/ subdirectory and the .conf files there. Also note that settings from the [Install] section are not honored in drop-in unit files, and have no effect.
.conf
.d/
[Install]
In addition to /etc/systemd/system, the drop-in .d directories for system services can be placed in /usr/lib/systemd/system or /run/systemd/system directories. Drop-in files in /etc take precedence over those in /run which in turn take precedence over those in /usr/lib. Drop-in files under any of these directories take precedence over unit files wherever located. Multiple drop-in files with different names are applied in lexicographic order, regardless of which of the directories they reside in.
.d
Some unit names reflect paths existing in the file system namespace. Example: a device unit dev-sda.device refers to a device with the device node /dev/sda in the file system namespace. If this applies, a special way to escape the path name is used, so that the result is usable as part of a filename. Basically, given a path, "/" is replaced by "-", and all other characters which are not ASCII alphanumerics are replaced by C-style "\x2d" escapes (except that "_" is never replaced and "." is only replaced when it would be the first character in the escaped path). The root directory "/" is encoded as single dash, while otherwise the initial and ending "/" are removed from all paths during transformation. This escaping is reversible. Properly escaped paths can be generated using the systemd-escape(1) command.
Optionally, units may be instantiated from a template file at runtime. This allows creation of multiple units from a single configuration file. If systemd looks for a unit configuration file, it will first search for the literal unit name in the file system. If that yields no success and the unit name contains an @ character, systemd will look for a unit template that shares the same name but with the instance string (i.e. the part between the @ character and the suffix) removed. Example: if a service getty@tty3.service is requested and no file by that name is found, systemd will look for getty@.service and instantiate a service from that configuration file if it is found.
@
To refer to the instance string from within the configuration file you may use the special %i specifier in many of the configuration options. See below for details.
%i
If a unit file is empty (i.e. has the file size 0) or is symlinked to /dev/null, its configuration will not be loaded and it appears with a load state of masked, and cannot be activated. Use this as an effective way to fully disable a unit, making it impossible to start it even manually.
masked
The unit file format is covered by the Interface Stability Promise.
Additional units might be loaded into systemd ("linked") from directories not on the unit load path. See the link command for systemctl(1). Also, some units are dynamically created via a systemd.generator(7).
This configuration class was generated from systemd documentation. by parse-man.pl
A free-form string describing the unit. This is intended for use in UIs to show descriptive information along with the unit name. The description should contain a name that means something to the end user. Apache2 Web Server is a good example. Bad examples are high-performance light-weight HTTP server (too generic) or Apache2 (too specific and meaningless for people who do not know Apache). Optional. Type uniline.
Apache2 Web Server
high-performance light-weight HTTP server
Apache2
A space-separated list of URIs referencing documentation for this unit or its configuration. Accepted are only URIs of the types http://, https://, file:, info:, man:. For more information about the syntax of these URIs, see uri(7). The URIs should be listed in order of relevance, starting with the most relevant. It is a good idea to first reference documentation that explains what the unit's purpose is, followed by how it is configured, followed by any other related documentation. This option may be specified more than once, in which case the specified list of URIs is merged. If the empty string is assigned to this option, the list is reset and all prior assignments will have no effect. Optional. Type list of uniline.
http://
https://
file:
info:
man:
Configures requirement dependencies on other units. If this unit gets activated, the units listed here will be activated as well. If one of the other units gets deactivated or its activation fails, this unit will be deactivated. This option may be specified more than once or multiple space-separated units may be specified in one option in which case requirement dependencies for all listed names will be created. Note that requirement dependencies do not influence the order in which services are started or stopped. This has to be configured independently with the After or Before options. If a unit foo.service requires a unit bar.service as configured with Requires and no ordering is configured with After or Before, then both units will be started simultaneously and without any delay between them if foo.service is activated. Often, it is a better choice to use Wants instead of Requires in order to achieve a system that is more robust when dealing with failing services.
Note that this dependency type does not imply that the other unit always has to be in active state when this unit is running. Specifically: failing condition checks (such as ConditionPathExists, ConditionPathExists, … — see below) do not cause the start job of a unit with a Requires dependency on it to fail. Also, some unit types may deactivate on their own (for example, a service process may decide to exit cleanly, or a device may be unplugged by the user), which is not propagated to units having a Requires dependency. Use the BindsTo dependency type together with After to ensure that a unit may never be in active state without a specific other unit also in active state (see below).
ConditionPathExists
BindsTo
Note that dependencies of this type may also be configured outside of the unit configuration file by adding a symlink to a .requires/ directory accompanying the unit file. For details, see above. Optional. Type list of uniline.
Similar to Requires. However, if the units listed here are not started already, they will not be started and the transaction will fail immediately. Optional. Type list of uniline.
A weaker version of Requires. Units listed in this option will be started if the configuring unit is. However, if the listed units fail to start or cannot be added to the transaction, this has no impact on the validity of the transaction as a whole. This is the recommended way to hook start-up of one unit to the start-up of another unit.
Note that dependencies of this type may also be configured outside of the unit configuration file by adding symlinks to a .wants/ directory accompanying the unit file. For details, see above. Optional. Type list of uniline.
Configures requirement dependencies, very similar in style to Requires. However, this dependency type is stronger: in addition to the effect of Requires it declares that if the unit bound to is stopped, this unit will be stopped too. This means a unit bound to another unit that suddenly enters inactive state will be stopped too. Units can suddenly, unexpectedly enter inactive state for different reasons: the main process of a service unit might terminate on its own choice, the backing device of a device unit might be unplugged or the mount point of a mount unit might be unmounted without involvement of the system and service manager.
When used in conjunction with After on the same unit the behaviour of BindsTo is even stronger. In this case, the unit bound to strictly has to be in active state for this unit to also be in active state. This not only means a unit bound to another unit that suddenly enters inactive state, but also one that is bound to another unit that gets skipped due to a failed condition check (such as ConditionPathExists, ConditionPathIsSymbolicLink, … — see below) will be stopped, should it be running. Hence, in many cases it is best to combine BindsTo with After. Optional. Type list of uniline.
ConditionPathIsSymbolicLink
Configures dependencies similar to Requires, but limited to stopping and restarting of units. When systemd stops or restarts the units listed here, the action is propagated to this unit. Note that this is a one-way dependency — changes to this unit do not affect the listed units. Optional. Type list of uniline.
A space-separated list of unit names. Configures negative requirement dependencies. If a unit has a Conflicts setting on another unit, starting the former will stop the latter and vice versa. Note that this setting is independent of and orthogonal to the After and Before ordering dependencies.
Conflicts
If a unit A that conflicts with a unit B is scheduled to be started at the same time as B, the transaction will either fail (in case both are required part of the transaction) or be modified to be fixed (in case one or both jobs are not a required part of the transaction). In the latter case, the job that is not the required will be removed, or in case both are not required, the unit that conflicts will be started and the unit that is conflicted is stopped. Optional. Type list of uniline.
These two settings expect a space-separated list of unit names. They configure ordering dependencies between units. If a unit foo.service contains a setting Before=bar.service and both units are being started, bar.service's start-up is delayed until foo.service has finished starting up. Note that this setting is independent of and orthogonal to the requirement dependencies as configured by Requires, Wants or BindsTo. It is a common pattern to include a unit name in both the After and Requires options, in which case the unit listed will be started before the unit that is configured with these options. This option may be specified more than once, in which case ordering dependencies for all listed names are created. After is the inverse of Before, i.e. while After ensures that the configured unit is started after the listed unit finished starting up, Before ensures the opposite, that the configured unit is fully started up before the listed unit is started. Note that when two units with an ordering dependency between them are shut down, the inverse of the start-up order is applied. i.e. if a unit is configured with After on another unit, the former is stopped before the latter if both are shut down. Given two units with any ordering dependency between them, if one unit is shut down and the other is started up, the shutdown is ordered before the start-up. It doesn't matter if the ordering dependency is After or Before, in this case. It also doesn't matter which of the two is shut down, as long as one is shut down and the other is started up. The shutdown is ordered before the start-up in all cases. If two units have no ordering dependencies between them, they are shut down or started up simultaneously, and no ordering takes place. It depends on the unit type when precisely a unit has finished starting up. Most importantly, for service units start-up is considered completed for the purpose of Before/After when all its configured start-up commands have been invoked and they either failed or reported start-up success. Optional. Type list of uniline.
Before=bar.service
A space-separated list of one or more units that are activated when this unit enters the failed state. Optional. Type uniline.
failed
A space-separated list of one or more units where reload requests on this unit will be propagated to, or reload requests on the other unit will be propagated to this unit, respectively. Issuing a reload request on a unit will automatically also enqueue a reload request on all units that the reload request shall be propagated to via these two settings. Optional. Type uniline.
For units that start processes (such as service units), lists one or more other units whose network and/or temporary file namespace to join. This only applies to unit types which support the PrivateNetwork and PrivateTmp directives (see systemd.exec(5) for details). If a unit that has this setting set is started, its processes will see the same /tmp, /var/tmp and network namespace as one listed unit that is started. If multiple listed units are already started, it is not defined which namespace is joined. Note that this setting only has an effect if PrivateNetwork and/or PrivateTmp is enabled for both the unit that joins the namespace and the unit whose namespace is joined. Optional. Type uniline.
PrivateNetwork
PrivateTmp
Takes a space-separated list of absolute paths. Automatically adds dependencies of type Requires and After for all mount units required to access the specified path.
Mount points marked with noauto are not mounted automatically through local-fs.target, but are still honored for the purposes of this option, i.e. they will be pulled in by this unit. Optional. Type uniline.
noauto
Takes a value of fail, replace, replace-irreversibly, isolate, flush, ignore-dependencies or ignore-requirements. Defaults to replace. Specifies how the units listed in OnFailure will be enqueued. See systemctl(1)'s --job-mode= option for details on the possible values. If this is set to isolate, only a single unit may be listed in OnFailure.. Optional. Type uniline.
fail
replace
replace-irreversibly
isolate
flush
ignore-dependencies
ignore-requirements
OnFailure
--job-mode=
Takes a boolean argument. If true, this unit will not be stopped when isolating another unit. Defaults to false. Optional. Type boolean.
Takes a boolean argument. If true, this unit will be stopped when it is no longer used. Note that, in order to minimize the work to be executed, systemd will not stop units by default unless they are conflicting with other units, or the user explicitly requested their shut down. If this option is set, a unit will be automatically cleaned up if no other active unit requires it. Defaults to false. Optional. Type boolean.
Takes a boolean argument. If true, this unit can only be activated or deactivated indirectly. In this case, explicit start-up or termination requested by the user is denied, however if it is started or stopped as a dependency of another unit, start-up or termination will succeed. This is mostly a safety feature to ensure that the user does not accidentally activate units that are not intended to be activated explicitly, and not accidentally deactivate units that are not intended to be deactivated. These options default to false. Optional. Type boolean.
Takes a boolean argument. If true, this unit may be used with the systemctl isolate command. Otherwise, this will be refused. It probably is a good idea to leave this disabled except for target units that shall be used similar to runlevels in SysV init systems, just as a precaution to avoid unusable system states. This option defaults to false. Optional. Type boolean.
Takes a boolean argument. If true, (the default), a few default dependencies will implicitly be created for the unit. The actual dependencies created depend on the unit type. For example, for service units, these dependencies ensure that the service is started only after basic system initialization is completed and is properly terminated on system shutdown. See the respective man pages for details. Generally, only services involved with early boot or late shutdown should set this option to false. It is highly recommended to leave this option enabled for the majority of common units. If set to false, this option does not disable all implicit dependencies, just non-essential ones. Optional. Type boolean.
When a job for this unit is queued, a time-out JobTimeoutSec may be configured. Similarly, JobRunningTimeoutSec starts counting when the queued job is actually started. If either time limit is reached, the job will be cancelled, the unit however will not change state or even enter the failed mode. This value defaults to infinity (job timeouts disabled), except for device units (JobRunningTimeoutSec defaults to DefaultTimeoutStartSec). NB: this timeout is independent from any unit-specific timeout (for example, the timeout set with TimeoutStartSec in service units) as the job timeout has no effect on the unit itself, only on the job that might be pending for it. Or in other words: unit-specific timeouts are useful to abort unit state changes, and revert them. The job timeout set with this option however is useful to abort only the job waiting for the unit state to change.
JobTimeoutSec
JobRunningTimeoutSec
infinity
DefaultTimeoutStartSec
TimeoutStartSec
JobTimeoutAction optionally configures an additional action to take when the time-out is hit. It takes the same values as the per-service StartLimitAction setting, see systemd.service(5) for details. Defaults to none. JobTimeoutRebootArgument configures an optional reboot string to pass to the reboot(2) system call. Optional. Type uniline.
JobTimeoutAction
StartLimitAction
none
JobTimeoutRebootArgument
Configure unit start rate limiting. By default, units which are started more than 5 times within 10 seconds are not permitted to start any more times until the 10 second interval ends. With these two options, this rate limiting may be modified. Use StartLimitIntervalSec to configure the checking interval (defaults to DefaultStartLimitIntervalSec in manager configuration file, set to 0 to disable any kind of rate limiting). Use StartLimitBurst to configure how many starts per interval are allowed (defaults to DefaultStartLimitBurst in manager configuration file). These configuration options are particularly useful in conjunction with the service setting Restart (see systemd.service(5)); however, they apply to all kinds of starts (including manual), not just those triggered by the Restart logic. Note that units which are configured for Restart and which reach the start limit are not attempted to be restarted anymore; however, they may still be restarted manually at a later point, from which point on, the restart logic is again activated. Note that systemctl reset-failed will cause the restart rate counter for a service to be flushed, which is useful if the administrator wants to manually start a unit and the start limit interferes with that. Note that this rate-limiting is enforced after any unit condition checks are executed, and hence unit activations with failing conditions are not counted by this rate limiting. Slice, target, device and scope units do not enforce this setting, as they are unit types whose activation may either never fail, or may succeed only a single time. Optional. Type uniline.
StartLimitIntervalSec
DefaultStartLimitIntervalSec
StartLimitBurst
DefaultStartLimitBurst
Restart
Configure the action to take if the rate limit configured with StartLimitIntervalSec and StartLimitBurst is hit. Takes one of none, reboot, reboot-force, reboot-immediate, poweroff, poweroff-force or poweroff-immediate. If none is set, hitting the rate limit will trigger no action besides that the start will not be permitted. reboot causes a reboot following the normal shutdown procedure (i.e. equivalent to systemctl reboot). reboot-force causes a forced reboot which will terminate all processes forcibly but should cause no dirty file systems on reboot (i.e. equivalent to systemctl reboot -f) and reboot-immediate causes immediate execution of the reboot(2) system call, which might result in data loss. Similarly, poweroff, poweroff-force, poweroff-immediate have the effect of powering down the system with similar semantics. Defaults to none. Optional. Type enum. choice: 'none', 'reboot', 'reboot-force', 'reboot-immediate', 'poweroff', 'poweroff-force', 'poweroff-immediate'.
reboot
reboot-force
reboot-immediate
poweroff
poweroff-force
poweroff-immediate
Configure the optional argument for the reboot(2) system call if StartLimitAction or a service's FailureAction is a reboot action. This works just like the optional argument to systemctl reboot command. Optional. Type uniline.
FailureAction
Before starting a unit, verify that the specified condition is true. If it is not true, the starting of the unit will be (mostly silently) skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. Use condition expressions in order to silently skip units that do not apply to the local running system, for example because the kernel or runtime environment doesn't require its functionality. Use the various AssertArchitecture=, AssertVirtualization=, … options for a similar mechanism that puts the unit in a failure state and logs about the failed check (see below).
AssertArchitecture=
AssertVirtualization=
ConditionArchitecture= may be used to check whether the system is running on a specific architecture. Takes one of x86, x86-64, ppc, ppc-le, ppc64, ppc64-le, ia64, parisc, parisc64, s390, s390x, sparc, sparc64, mips, mips-le, mips64, mips64-le, alpha, arm, arm-be, arm64, arm64-be, sh, sh64, m68k, tilegx, cris, arc, arc-be to test against a specific architecture. The architecture is determined from the information returned by uname(2) and is thus subject to personality(2). Note that a Personality= setting in the same unit file has no effect on this condition. A special architecture name native is mapped to the architecture the system manager itself is compiled for. The test may be negated by prepending an exclamation mark.
ConditionArchitecture=
x86
x86-64
ppc
ppc-le
ppc64
ppc64-le
ia64
parisc
parisc64
s390
s390x
sparc
sparc64
mips
mips-le
mips64
mips64-le
alpha
arm
arm-be
arm64
arm64-be
sh
sh64
m68k
tilegx
cris
arc
arc-be
Personality=
native
If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type list of enum.
ConditionPathIsSymbolicLink=
ConditionVirtualization= may be used to check whether the system is executed in a virtualized environment and optionally test whether it is a specific implementation. Takes either boolean value to check if being executed in any virtualized environment, or one of vm and container to test against a generic type of virtualization solution, or one of qemu, kvm, zvm, vmware, microsoft, oracle, xen, bochs, uml, openvz, lxc, lxc-libvirt, systemd-nspawn, docker, rkt to test against a specific implementation, or private-users to check whether we are running in a user namespace. See systemd-detect-virt(1) for a full list of known virtualization technologies and their identifiers. If multiple virtualization technologies are nested, only the innermost is considered. The test may be negated by prepending an exclamation mark.
ConditionVirtualization=
vm
container
qemu
kvm
zvm
vmware
microsoft
oracle
xen
bochs
uml
openvz
lxc
lxc-libvirt
systemd-nspawn
docker
rkt
private-users
If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type list of uniline.
ConditionHost= may be used to match against the hostname or machine ID of the host. This either takes a hostname string (optionally with shell style globs) which is tested against the locally set hostname as returned by gethostname(2), or a machine ID formatted as string (see machine-id(5)). The test may be negated by prepending an exclamation mark.
ConditionHost=
ConditionKernelCommandLine= may be used to check whether a specific kernel command line option is set (or if prefixed with the exclamation mark unset). The argument must either be a single word, or an assignment (i.e. two words, separated =). In the former case the kernel command line is searched for the word appearing as is, or as left hand side of an assignment. In the latter case, the exact assignment is looked for with right and left hand side matching.
ConditionKernelCommandLine=
=
ConditionSecurity= may be used to check whether the given security module is enabled on the system. Currently, the recognized values are selinux, apparmor, ima, smack and audit. The test may be negated by prepending an exclamation mark.
ConditionSecurity=
selinux
apparmor
ima
smack
audit
ConditionCapability= may be used to check whether the given capability exists in the capability bounding set of the service manager (i.e. this does not check whether capability is actually available in the permitted or effective sets, see capabilities(7) for details). Pass a capability name such as CAP_MKNOD, possibly prefixed with an exclamation mark to negate the check.
ConditionCapability=
CAP_MKNOD
ConditionACPower= may be used to check whether the system has AC power, or is exclusively battery powered at the time of activation of the unit. This takes a boolean argument. If set to true, the condition will hold only if at least one AC connector of the system is connected to a power source, or if no AC connectors are known. Conversely, if set to false, the condition will hold only if there is at least one AC connector known and all AC connectors are disconnected from a power source.
ConditionACPower=
ConditionNeedsUpdate= takes one of /var or /etc as argument, possibly prefixed with a ! (for inverting the condition). This condition may be used to conditionalize units on whether the specified directory requires an update because /usr's modification time is newer than the stamp file .updated in the specified directory. This is useful to implement offline updates of the vendor operating system resources in /usr that require updating of /etc or /var on the next following boot. Units making use of this condition should order themselves before systemd-update-done.service(8), to make sure they run before the stamp file's modification time gets reset indicating a completed update.
ConditionNeedsUpdate=
!
ConditionFirstBoot= takes a boolean argument. This condition may be used to conditionalize units on whether the system is booting up with an unpopulated /etc directory (specifically: an /etc with no /etc/machine-id). This may be used to populate /etc on the first boot after factory reset, or when a new system instance boots up for the first time.
ConditionFirstBoot=
With ConditionPathExists= a file existence condition is checked before a unit is started. If the specified absolute path name does not exist, the condition will fail. If the absolute path name passed to ConditionPathExists= is prefixed with an exclamation mark (!), the test is negated, and the unit is only started if the path does not exist.
ConditionPathExists=
ConditionPathExistsGlob= is similar to ConditionPathExists=, but checks for the existence of at least one file or directory matching the specified globbing pattern.
ConditionPathExistsGlob=
ConditionPathIsDirectory= is similar to ConditionPathExists= but verifies whether a certain path exists and is a directory.
ConditionPathIsDirectory=
ConditionPathIsSymbolicLink= is similar to ConditionPathExists= but verifies whether a certain path exists and is a symbolic link.
ConditionPathIsMountPoint= is similar to ConditionPathExists= but verifies whether a certain path exists and is a mount point.
ConditionPathIsMountPoint=
ConditionPathIsReadWrite= is similar to ConditionPathExists= but verifies whether the underlying file system is readable and writable (i.e. not mounted read-only).
ConditionPathIsReadWrite=
ConditionDirectoryNotEmpty= is similar to ConditionPathExists= but verifies whether a certain path exists and is a non-empty directory.
ConditionDirectoryNotEmpty=
ConditionFileNotEmpty= is similar to ConditionPathExists= but verifies whether a certain path exists and refers to a regular file with a non-zero size.
ConditionFileNotEmpty=
ConditionFileIsExecutable= is similar to ConditionPathExists= but verifies whether a certain path exists, is a regular file and marked executable.
ConditionFileIsExecutable=
ConditionUser= takes a numeric UID, a UNIX user name, or the special value @system. This condition may be used to check whether the service manager is running as the given user. The special value @system can be used to check if the user id is within the system user range. This option is not useful for system services, as the system manager exclusively runs as the root user, and thus the test result is constant.
ConditionUser=
UID
@system
ConditionGroup= is similar to ConditionUser= but verifies that the service manager's real or effective group, or any of its auxiliary groups match the specified group or GID. This setting does not have a special value @system.
ConditionGroup=
Similar to the ConditionArchitecture, ConditionVirtualization, …, condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job (which means this is logged loudly). Use assertion expressions for units that cannot operate when specific requirements are not met, and when this is something the administrator or user should look into. Optional. Type uniline.
ConditionArchitecture
ConditionVirtualization
A path to a configuration file this unit has been generated from. This is primarily useful for implementation of generator tools that convert configuration from an external configuration file format into native unit files. This functionality should not be used in normal units. Optional. Type uniline.
cme
To install Config::Model::Systemd, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Config::Model::Systemd
CPAN shell
perl -MCPAN -e shell install Config::Model::Systemd
For more information on module installation, please visit the detailed CPAN module installation guide.