NSSM - the Non-Sucking Service Manager
Managing services from the command line
nssm's core functionality has always been available from the command line.
nssm install <servicename>
nssm install <servicename> <program>
nssm install <servicename> <program> [<arguments>]
By default the service's startup directory will be set to the directory
program. The startup directory can be overridden
after the service has been installed.
nssm set <servicename> AppDirectory <path>
nssm remove <servicename>
nssm remove <servicename> confirm
As of version 2.22, nssm offers basic service management
functionality. nssm will also accept a service
displayname anywhere that a
servicename is expected,
since Windows does not allow a service to have a name or display name which
conflicts with either the name or display name of another service. Both the
service name (also called the service key name) and its display name uniquely
identify a service.
Starting and stopping a service
nssm start <servicename>
nssm stop <servicename>
nssm restart <servicename>
Querying a service's status
nssm status <servicename>
Sending controls to services
nssm pause <servicename>
nssm continue <servicename>
nssm rotate <servicename>
nssm rotate triggers
on-demand rotation for nssm
services with I/O redirection and
online rotation enabled. nssm
accepts user-defined control 128 as a cue to begin output file rotation.
Non-nssm services might respond to control 128 in their own way (or
ignore it, or crash).
As of version 2.22, all parameters understood by nssm can be queried or configured on the command line. A subset of system parameters can also be queried and, in some cases, modified.
Parameters can usually be queried as follows.
nssm get <servicename> <parameter>
Some parameters are ambiguous and require a subparameter. See below.
nssm get <servicename> <parameter> <subparameter>
Parameters can usually be set in a similar way.
nssm set <servicename> <parameter> <value>
nssm set <servicename> <parameter> <subparameter> <value>
Most parameters can be reset to their defaults, which is equivalent to removing the associated registry entry.
nssm reset <servicename> <parameter>
nssm reset <servicename> <parameter> <subparameter>
As a convenience, nssm will accept additional arguments beyond the
value required, and concatenate them together, separated by
single spaces. Thus the following two invocations are identical:
nssm set <servicename> AppParameters "-classpath C:\Classes"
nssm set <servicename> AppParameters -classpath C:\Classes
parameter is usually a string with the same name as the
registry entry which controls the associated functionality. So, for example,
the following command sets the startup directory for a service:
nssm set <servicename> AppDirectory <path>
nssm set <servicename> AppRotation 1
See below for a list of parameters whose values are set differently.
Certain parameters configure properties of the service itself rather than the behaviour of nssm. They too are named after their associated registry values.
DependOnGroup: Load order groups whose members must start before the service can start.
DependOnService: Services which must start before the service can start.
Description: The service's description
DisplayName: The service's display name, eg Application Layer Gateway Service. This is the name shown under the Name column in services.msc.
ImagePath: Path to the service executable, eg C:\Windows\System32\alg.exe. For nssm services, this will be the path to nssm.exe.
ObjectName: The name of the user account under which the service runs. The default is LOCALSYSTEM.
Name: The service key name, eg ALG. The key name cannot be changed. You can use
nssm get <displayname> Nameto find out the key name of a service.
Start: The service's startup type, eg Automatic.
Type: The service type. nssm can only edit services of type
When used with
nssm get, AppEnvironment and AppEnvironmentExtra accept an optional subparameter. If no subparameter is given,
nssm getwill print all configured environment variables, one per line in the form KEY=VALUE. If a subparameter is given,
nssm getwill print the value configured for the named environment variable, or the empty string if that variable is not present in the environment block.
For example, suppose that AppEnvironmentExtra were configured with two variables, CLASSPATH=C:\Classes and TEMP=C:\Temp. The following invocation:
nssm get <servicename> AppEnvironmentExtra
Whereas the syntax below:
nssm get <servicename> AppEnvironmentExtra CLASSPATH
When setting an environment block with
nssm set, each variable should be specified as a KEY=VALUE pair in a separate argument. For example:
nssm set <servicename> AppEnvironmentExtra CLASSPATH=C:\Classes TEMP=C:\Temp
The AppExit parameter requires a subparameter specifying the exit code to get or set. The default action can be specified with the string Default.
For example, to get the default exit action for a service you should run:
nssm get <servicename> AppExit Default
To get the exit action when the application exits with exit code 2, run:
nssm get <servicename> AppExit 2
Note that if no explicit action is configured for a specified exit code, nssm will print the default exit action.
To set configure the service to stop when the application exits with an exit code of 2, run:
nssm set <servicename> AppExit 2 Exit
The AppPriority parameter takes a priority class constant as specified in the
SetPriorityClass()documentation. Valid priorities are:
Non-standard native parameters
When used with
nssm set, the DependOnGroup and DependOnService parameters treat each subsequent command line argument as a dependency group or service.
Groups can be specified with or without the
SC_GROUP_IDENTIFIERprefix (the + symbol). Services can be specified via their key name or display name.
The following two invocations are equivalent:
nssm set <servicename> DependOnService RpcSS LanmanWorkstation
nssm set <servicename> DependOnService "Remote Procedure Call (RPC)" LanmanWorkstation
Groups will always be prefixed by the
SC_GROUP_IDENTIFIERwhen queried with
When used with
nssm set, the ObjectName parameter requires an additional argument specifying the password of the user which will run the service.
To retrieve the username, run:
nssm get <servicename> ObjectName
To set the username and password, run:
nssm set <servicename> ObjectName <username> <password>
Note that the rules of argument concatenation still apply. The following invocation will have the expected effect:
nssm set <servicename> ObjectName <username> correct horse battery staple
If you absolutely must configure an account with a blank password, run:
nssm set <servicename> ObjectName <username> ""
Valid values for the Start parameter are:
- SERVICE_AUTO_START: Automatic startup at boot.
- SERVICE_DELAYED_AUTO_START: Delayed startup at boot.
- SERVICE_DEMAND_START: Manual startup.
- SERVICE_DISABLED: Service is disabled.
Note that SERVICE_DELAYED_AUTO_START is not supported on versions of Windows prior to Vista. nssm will set the service to automatic startup if delayed start is unavailable.
The Type parameter is used to query or set the service type. nssm recognises all currently documented service types but will only allow setting one of two types:
- SERVICE_WIN32_OWN_PROCESS: A standalone service. This is the default.
- SERVICE_INTERACTIVE_PROCESS: A service which can interact with the desktop.
A service may only be configured as interactive if it runs under the LOCALSYSTEM account. To guarantee success when attempting to configure an interactive service, run two commands in sequence:
nssm reset <servicename> ObjectName nssm set <servicename> Type SERVICE_INTERACTIVE_PROCESS