246 lines
8.4 KiB
Groff
246 lines
8.4 KiB
Groff
.TH SERVICE 8
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.SH NAME
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service \- Manage an operating system service.
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.SH SYNOPSIS
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.PP
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\fBservice [-b -c -n -p -r] (up|run|edit|update)\fR \fI<binary|self>\fR
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[\fB-args\fR \fI<args>\fR] [\fB-dev\fR \fI<special>\fR]
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[\fB-devstyle\fR \fI<style>\fR] [\fB-period\fR \fI<ticks>\fR]
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[\fB-script\fR \fI<path>\fR] [\fB-label\fR \fI<name>\fR]
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[\fB-config\fR \fI<path>\fR] [\fB-state\fR \fI<state>\fR]
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[\fB-maxtime\fR \fI<time>\fR]
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.PP
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\fBservice down\fR \fI<label>\fR
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.PP
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\fBservice refresh\fR \fI<label>\fR
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.PP
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\fBservice restart\fR \fI<label>\fR
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.PP
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\fBservice clone\fR \fI<label>\fR
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.PP
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\fBservice shutdown\fR
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.br
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.de FL
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.TP
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\\fB\\$1\\fR
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\\$2
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..
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.de EX
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.TP
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\\fB\\$1\\fR
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\\$2
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..
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.SH DESCRIPTION
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.PP
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The \fBservice\fR utility instructs the reincarnation server (\fBRS\fR)
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to perform an action for a given system service (an OS server
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or device driver). The action may concern an existing system service
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(SHIFT+F6 to list them all), or a new system service to be started
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(actions \fBup\fR and \fBrun\fR).
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.br
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.de FL
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.TP
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\\fB\\$1\\fR
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\\$2
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..
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.de EX
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.TP
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\\fB\\$1\\fR
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\\$2
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..
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.SH ACTIONS
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.PP
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.SS
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\fBservice up\fR \fI<binary>\fR
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.PP
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.PP
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Starts a new system service identified by the given \fI<binary>\fR,
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which must be specified using an absolute path. When the service
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unexpectedly exits (for example, as a result of a crash or a panic), \fBRS\fR
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will intercept the event and restart the service automatically.
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If the service fails to restart, \fBRS\fR will automatically bring
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it down allowing for graceful degradation of service. If a critical
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system service fails to restart, \fBRS\fR will immediately resort to
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a system-wide panic. The \fBup\fR action takes the following options:
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.TP
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.BI \-b " "
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disable the usage of binary exponential restart time in \fBRS\fR.
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.TP
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.BI \-c " "
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\fBRS\fR normally relies on the binary on the disk to restart a
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system service. The
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.B \-c
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option instructs \fBRS\fR to keep an in-memory copy of the binary and
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use the copy to restart the service upon termination. This is necessary
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when the location on the disk may change or if the service itself is
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required to read the binary from the disk (e.g. the disk driver).
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.TP
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.BI \-n " "
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by default, \fBRS\fR performs blocking startup of the system service. As
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a result, the \fBup\fR action does not terminate until the system service
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completes initialization.
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The
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.B \-n
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option changes the default behavior by performing non-blocking startup
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and thus terminating the \fBup\fR action immediately without waiting for
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the service to complete initialization.
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.TP
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.BI \-p " "
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instructs \fBRS\fR to keep a replica of the system service in background
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and use the replica to restart the service upon termination. This is
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necessary when the service itself is required to create a working
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service instance (e.g. \fBPM\fR).
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.TP
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.BI \-r " "
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when saving an in-memory copy, instructs \fBRS\fR to reuse and share the copy
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of an existing service with the same program name, if available.
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.TP
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.BI \-args " <args>"
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specifies the command line arguments to use to run the program
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given by \fI<binary>\fR. The default is to use no arguments.
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.TP
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.BI \-dev " <special>"
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specifies the device file to associate to the system service (used only for
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device drivers). The default is to associate no device file to the service.
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.TP
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.BI \-devstyle " <style>"
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specifies the device style to associate to the system service (used only for
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device drivers). The list of supported device styles is available in
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the header file \fB<minix/dmap.h>\fR.
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The default is to associate no device style (\fBSTYLE_NDEV\fR) to the service.
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.TP
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.BI \-period " <ticks>"
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specifies the period to use for the system service.
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When a period is specified, \fBRS\fR sends a ping request to
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the system service after every period. If the response does not arrive
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in time, \fBRS\fR will kill the misbehaving service and restart a new one.
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The period must be specified in ticks, but can be appended with HZ to
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make it seconds. The default is to use no period for the service.
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.TP
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.BI \-script " <path>"
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specifies the recovery script to associate to the system service. When a
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recovery script is used, \fBRS\fR will not attempt to restart the service
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upon termination. \fBRS\fR will instead invoke the script and
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delegate the recovery process to it. The script may perform several
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operations, including instructing \fBRS\fR to restart the service
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(\fBrestart\fR action) or bring it down (\fBdown\fR action).
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The default is to associate no recovery script to the service.
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.TP
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.BI \-label " <name>"
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specifies the label to use for the system service. The label is used to
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univoquely identify the system service. The default is to use the program
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name as the label.
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.TP
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.BI \-config " <path>"
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specifies the absolute path of the system configuration file with the settings
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of the system service. See
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.IR system.conf (5)
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for the syntax to use in the system configuration file.
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The default is to use the global system configuration file \fB/etc/system.conf\fR.
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.PP
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.SS
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\fBservice run\fR \fI<binary>\fR
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.PP
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.PP
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Runs a new system service identified by the given \fI<binary>\fR,
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which must be specified using an absolute path. Similar to
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\fBservice up\fR \fI<binary>\fR, but instructs \fBRS\fR not to
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restart the service upon termination. This action is currently a shorthand
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for \fBservice up\fR \fI<binary>\fR \fB-script\fR \fI/etc/rs.single\fR, which
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uses a recovery script that simply brings down the service upon termination.
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This action should be only used for short-lived programs that need system
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service privileges and do not require crash recovery support.
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.PP
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.SS
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\fBservice edit\fR \fI<binary>\fR [\fB-label\fR \fI<name>\fR]
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.PP
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.PP
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Edits settings of an existing system service identified by the given
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label \fI<name>\fR. This action can be used to dynamically update the
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properties of any system service, including those contained in the
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boot image (e.g. \fBVM\fR). There are a few exceptions to the properties
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that can be actually overridden dynamically. For example, the device file
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and the device style associated to the service will no be updated. This
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action takes the same options supported by the \fBup\fR action.
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.PP
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.SS
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\fBservice update\fR \fI<binary|self>\fR
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.PP
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.PP
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Live updates an existing system service with a new version identified by the
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given \fI<binary>\fR, which must be specified using an absolute path.
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The existing service will be identified from the label given (if explicitly
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specified), or from the program name. If \fI<self>\fR is specified as
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an argument instead, \fBRS\fR will perform a self update of the
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system service (i.e. an update of the service with its own replica). This
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is intended for testing purposes. In this case, a label \fI<name>\fR
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must be explicitly specified. Live update support is still in an early
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stage of development and is subject to change in future revisions. This
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action takes all the options supported by the \fBup\fR action and the
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following additional options:
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.TP
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.BI \-state " <state>"
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specifies the state of the service required by the update. The default
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is a state in which the service is blocked not processing any work.
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.TP
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.BI \-maxtime " <time>"
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specifies the maximum amount time for the service to prepare
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for the update. The default is 0 (unlimited).
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.PP
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.SS
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\fBservice down\fR \fI<label>\fR
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.PP
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.PP
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Stops an existing system service identified by the given \fI<label>\fR. \fBRS\fR
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will bring down the service without attempting to restart it. Critical system
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services cannot be shut down.
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.PP
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.SS
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\fBservice refresh\fR \fI<label>\fR
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.PP
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.PP
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Refreshes an existing system service identified by the given \fI<label>\fR.
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\fBRS\fR will kill the service and attempt to restart it.
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.PP
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.SS
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\fBservice restart\fR \fI<label>\fR
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.PP
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.PP
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Restarts an existing terminated system service identified by the
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given \fI<label>\fR. This action can only be used from a recovery script.
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.PP
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.SS
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\fBservice clone\fR \fI<label>\fR
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.PP
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.PP
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Clones an existing system service to create a replica \fBRS\fR will use
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to restart the service upon termination.
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.PP
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.SS
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\fBservice shutdown\fR
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.PP
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.PP
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Tells \fBRS\fR the system is about to shutdown and no system service should
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be restarted upon termination.
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.PP
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.SH EXAMPLES
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.TP 20
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.B service up /sbin/is -period 5HZ
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# Start the IS server and check its status every 5 seconds.
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.br
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.TP 20
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.B service up /usr/sbin/dp8390 -args DPETH0=pci
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# Start the DP8390 ethernet driver, passing one argument.
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.br
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.TP 20
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.B service down lance
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# Stop the system service with label lance.
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.br
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.SH "SEE ALSO"
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.PP
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.BR system.conf (5),
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.BR boot (8),
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.BR monitor (8).
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.SH AUTHOR
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Cristiano Giuffrida <giuffrida@cs.vu.nl>
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