winsw/doc/xmlConfigFile.md

Configuration File Syntax

This page describes the configuration file, which controls the behavior of the Jenkins service.

File structure

The root element of this XML file must be <service>, and it supports the following child element.

Example:

    <service>
      <id>jenkins</id>
      <name>Jenkins</name>
      <description>This service runs Jenkins continuous integration system.</description>
      <env name="JENKINS_HOME" value="%BASE%"/>
      <executable>java</executable>
      <arguments>-Xrs -Xmx256m -jar "%BASE%\jenkins.war" --httpPort=8080</arguments>
      <logmode>rotate</logmode>
    </service>

Environment Variable Expansion in Configuration File

Configuration XML files can include environment variable expansions of the form %Name%. Such occurrences, if found, will be automatically replaced by the actual values of the variables. If an undefined environment variable is referenced, no substitution occurs.

Configuration entries

id

Specifies the ID that Windows uses internally to identify the service.

This has to be unique among all the services installed in a system, and (while I haven't verified this) this must consist entirely out of alpha-numeric characters.

name

Short display name of the service, which can contain spaces and other characters. This shouldn't be too long, like <id>, and this also needs to be unique among all the services in a given system.

description

Long human-readable description of the service. This gets displayed in Windows service manager when the service is selected.

executable

This element specifies the executable to be launched. It can be either absolute path, or you can just specify the executable name and let it be searched from PATH (although note that the services often run in a different user account and therefore it might have different PATH than your shell does.)

startmode - Optional Element

This element specifies the start mode of the Windows service. It can be one of the following values: Boot, System, Automatic, or Manual. See MSDN for details. The default value is Automatic.

depend

Specify IDs of other services that this service depends on. When service X depends on service Y, X can only run if Y is running.

Multiple elements can be used to specify multiple dependencies.

    <depend>Eventlog</depend>
    <depend>W32Time</depend>

logging

Optionally set a different logging directory with <logpath> and startup <logmode>: reset (clear log), roll (move to *.old) or append (default).

argument

This element specifies the arguments to be passed to the executable. Winsw will quote each argument if necessary, so do not put quotes in <argument> to avoid double quotation.

    <argument>arg1</argument>
    <argument>arg2</argument>
    <argument>arg3</argument>

For backward compatibility, <arguments> element can be used instead to specify the whole command line in a single element.

stopargument/stopexecutable

When the service is requested to stop, winsw simply calls TerminateProcess function API to kill the service instantly. However, if <stopargument> elements are present, winsw will instead launch another process of <executable> (or <stopexecutable> if that's specified) with the <stopargument> arguments, and expects that to initiate the graceful shutdown of the service process.

Winsw will then wait for the two processes to exit on its own, before reporting back to Windows that the service has terminated.

When you use the <stopargument>, you must use <startargument> instead of <argument>. See the complete example below:

    <executable>catalina.sh</executable>
    <startargument>jpda</startargument>
    <startargument>run</startargument>
    
    <stopexecutable>catalina.sh</stopexecutable>
    <stopargument>stop</stopargument>

Note that the name of the element is startargument and not startarguments. As such, to specify multiple arguments, you'll specify multiple elements.

stoptimeout

When the service is requested to stop, winsw first attempts to GenerateConsoleCtrlEvent function (similar to Ctrl+C), then wait for up to 15 seconds for the process to exit by itself gracefully. A process failing to do that (or if the process does not have a console), then winsw resorts to calling TerminateProcess function API to kill the service instantly.

This optional element allows you to change this "15 seconds" value, so that you can control how long winsw gives the service to shut itself down. See <onfailure> below for how to specify time duration:

    <stoptimeout>10sec</stoptimeout>

env

This optional element can be specified multiple times if necessary to specify environment variables to be set for the child process. The syntax is:

    <env name="HOME" value="c:\abc" />

interactive

If this optional element is specified, the service will be allowed to interact with the desktop, such as by showing a new window and dialog boxes. If your program requires GUI, set this like the following:

    <interactive />

Note that since the introduction UAC (Windows Vista and onward), services are no longer really allowed to interact with the desktop. In those OSes, all that this does is to allow the user to switch to a separate window station to interact with the service.

beeponshutdown

This optional element is to emit simple tone when the service shuts down. This feature should be used only for debugging, as some operating systems and hardware do not support this functionality.

download

This optional element can be specified multiple times to have the service wrapper retrieve resources from URL and place it locally as a file. This operation runs when the service is started, before the application specified by <executable> is launched.

    <download from="http://example.com/some.dat" to="%BASE%\some.dat"/>

This is another useful building block for developing a self-updating service.

log

See the "Logging" section above for more details.

onfailure

This optional repeatable element controls the behaviour when the process launched by winsw fails (i.e., exits with non-zero exit code).

    <onfailure action="restart" delay="10 sec"/>
    <onfailure action="restart" delay="20 sec"/>
    <onfailure action="reboot" />

For example, the above configuration causes the service to restart in 10 seconds after the first failure, restart in 20 seconds after the second failure, then Windows will reboot if the service fails one more time.

Each element contains a mandatory action attribute, which controls what Windows SCM will do, and optional delay attribute, which controls the delay until the action is taken. The legal values for action are:

• restart: restart the service
• reboot: reboot Windows
• none: do nothing and leave the service stopped

The possible suffix for the delay attribute is sec/secs/min/mins/hour/hours/day/days. If missing, the delay attribute defaults to 0.

If the service keeps failing and it goes beyond the number of <onfailure> configured, the last action will be repeated. Therefore, if you just want to always restart the service automatically, simply specify one <onfailure> element like this:

<onfailure action="restart" />

resetfailure

This optional element controls the timing in which Windows SCM resets the failure count. For example, if you specify <resetfailure>1 hour</resetfailure> and your service continues to run longer than one hour, then the failure count is reset to zero. This affects the behaviour of the failure actions (see <onfailure> above).

In other words, this is the duration in which you consider the service has been running successfully. Defaults to 1 day.

Service account

It is possible to specify the useraccount (and password) that the service will run as. To do this, specify a <serviceaccount> element like this:

    <serviceaccount>
       <domain>YOURDOMAIN</domain>
       <user>useraccount</user>
       <password>Pa55w0rd</password>
       <allowservicelogon>true</allowservicelogon>
    </serviceaccount>

The <allowservicelogon> is optional. If set to true, will automatically set the "Allow Log On As A Service" right to the listed account.

Working directory

Some services need to run with a working directory specified. To do this, specify a <workingdirectory> element like this:

<workingdirectory>C:\application</workingdirectory>

priority

Optionally specify the scheduling priority of the service process (equivalent of Unix nice) Possible values are idle, belownormal, normal, abovenormal, high, realtime (case insensitive.)

<priority>idle</priority>

Specifying a priority higher than normal has unintended consequences. See the MSDN article ProcessPriorityClass Enumeration for details. This feature is intended primarily to launch a process in a lower priority so as not to interfere with the computer's interactive usage.

###stopparentprocessfirst Optionally specify the order of service shutdown. If true, the parent process is shutdown first. This is useful when the main process is a console, which can respond to Ctrl+C command and will gracefully shutdown child processes.

<stopparentprocessfirst>true</stopparentprocessfirst>