docs / init script
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Patrick Stadler
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# metrics.sh
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metrics.sh is a metrics collection and fowarding daemon implemented in portable shell scripts. A simple interface based on hooks allows for writing custom metrics collectors.
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metrics.sh is a lightweight metrics collection and fowarding utility implemented in portable POSIX compliant shell scripts. An elegant interface based on hooks enables writing custom metric collectors and forwarders in a transparent way.
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Besides having a low impact on system resources, which makes metric.sh a suitable solution for running in virtual environments and servers with limited capacities, simplicty is the main goal of this project, hence its documentation shall fit in a single README.
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## Usage
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#!/bin/sh
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### BEGIN INIT INFO
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# Provides: metrics.sh
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# Required-Start: $remote_fs $syslog
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# Required-Stop: $remote_fs $syslog
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# Should-Start: $network
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# Should-Stop: $network
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# Required-Start: $local_fs $network $named $time $syslog
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# Required-Stop: $local_fs $network $named $time $syslog
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# Default-Start: 2 3 4 5
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# Default-Stop: 0 1 6
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# Short-Description: Start and stop metrics.sh
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# Description: Controls the metrics daemon "metrics.sh"
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### END INIT INFO
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# Author: Patrick Stadler <patrick.stadler@gmail.com
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# Do NOT "set -e"
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# PATH should only include /usr/* if it runs after the mountnfs.sh script
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PATH=/sbin:/usr/sbin:/bin:/usr/bin
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DESC="Collect and report system metrics"
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SCRIPT=<SCRIPT>
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RUNAS=<USER>
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ARGS=<ARGS>
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NAME=metrics.sh
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DAEMON=/usr/bin/$NAME
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DAEMON_ARGS=""
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PIDFILE=/var/run/$NAME.pid
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SCRIPTNAME=/etc/init.d/$NAME
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LOGFILE=/var/log/$NAME.log
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# Exit if the package is not installed
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[ -x "$DAEMON" ] || exit 0
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# Read configuration variable file if it is present
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[ -r /etc/default/$NAME ] && . /etc/default/$NAME
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# Load the VERBOSE setting and other rcS variables
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. /lib/init/vars.sh
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# Define LSB log_* functions.
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# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
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# and status_of_proc is working.
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. /lib/lsb/init-functions
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#
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# Function that starts the daemon/service
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#
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do_start()
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{
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# Return
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# 0 if daemon has been started
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# 1 if daemon was already running
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# 2 if daemon could not be started
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start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
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|| return 1
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start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON -- \
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$DAEMON_ARGS \
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|| return 2
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# Add code here, if necessary, that waits for the process to be ready
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# to handle requests from services started subsequently which depend
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# on this one. As a last resort, sleep for some time.
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start() {
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if [ -f $PIDFILE ] && kill -0 $(cat $PIDFILE); then
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echo 'Service already running' >&2
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return 1
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fi
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echo 'Starting service…' >&2
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local CMD="$SCRIPT &> \"$LOGFILE\" & echo \$!"
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su -c "$CMD $ARGS" $RUNAS > "$PIDFILE"
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echo 'Service started' >&2
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}
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#
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# Function that stops the daemon/service
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#
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do_stop()
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{
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# Return
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# 0 if daemon has been stopped
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# 1 if daemon was already stopped
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# 2 if daemon could not be stopped
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# other if a failure occurred
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start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
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RETVAL="$?"
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[ "$RETVAL" = 2 ] && return 2
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# Wait for children to finish too if this is a daemon that forks
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# and if the daemon is only ever run from this initscript.
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# If the above conditions are not satisfied then add some other code
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# that waits for the process to drop all resources that could be
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# needed by services started subsequently. A last resort is to
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# sleep for some time.
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start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
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[ "$?" = 2 ] && return 2
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# Many daemons don't delete their pidfiles when they exit.
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rm -f $PIDFILE
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return "$RETVAL"
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stop() {
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if [ ! -f "$PIDFILE" ] || ! kill -0 $(cat "$PIDFILE"); then
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echo 'Service not running' >&2
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return 1
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fi
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echo 'Stopping service…' >&2
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kill -15 $(cat "$PIDFILE") && rm -f "$PIDFILE"
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echo 'Service stopped' >&2
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}
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#
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# Function that sends a SIGHUP to the daemon/service
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#
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do_reload() {
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#
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# If the daemon can reload its configuration without
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# restarting (for example, when it is sent a SIGHUP),
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# then implement that here.
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#
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start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE --name $NAME
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return 0
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status() {
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printf "%-50s" "Checking $NAME..."
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if [ -f $PIDFILE ]; then
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PID=$(cat $PIDFILE)
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if [ -z "$(ps axf | grep ${PID} | grep -v grep)" ]; then
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printf "%s\n" "The process appears to be dead but pidfile still exists"
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else
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echo "Running, the PID is $PID"
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fi
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else
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printf "%s\n" "Service not running"
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fi
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}
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uninstall() {
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echo -n 'Are you really sure you want to uninstall this service? That cannot be undone. [yes|No] '
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local SURE
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read SURE
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if [ "$SURE" = "yes" ]; then
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stop
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rm -f "$PIDFILE"
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echo "Notice: log file was not removed: '$LOGFILE'" >&2
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update-rc.d -f <NAME> remove
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rm -fv "$0"
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fi
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}
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case "$1" in
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start)
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[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
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do_start
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case "$?" in
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0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
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2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
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esac
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start
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;;
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stop)
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[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
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do_stop
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case "$?" in
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0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
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2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
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esac
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stop
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;;
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status)
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status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
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status
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;;
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#reload|force-reload)
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#
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# If do_reload() is not implemented then leave this commented out
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# and leave 'force-reload' as an alias for 'restart'.
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#
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#log_daemon_msg "Reloading $DESC" "$NAME"
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#do_reload
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#log_end_msg $?
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#;;
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restart|force-reload)
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#
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# If the "reload" option is implemented then remove the
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# 'force-reload' alias
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#
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log_daemon_msg "Restarting $DESC" "$NAME"
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do_stop
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case "$?" in
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0|1)
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do_start
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case "$?" in
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0) log_end_msg 0 ;;
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1) log_end_msg 1 ;; # Old process is still running
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*) log_end_msg 1 ;; # Failed to start
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esac
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uninstall)
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uninstall
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;;
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restart)
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stop
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start
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;;
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*)
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# Failed to stop
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log_end_msg 1
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;;
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echo "Usage: $0 {start|stop|status|restart|uninstall}"
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esac
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;;
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*)
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#echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
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echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
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exit 3
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;;
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esac
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:
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