blog/Debian_init_d_boot_script_example_for_rsyslog.html

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   6     <title>Petter Reinholdtsen: Debian init.d boot script example for rsyslog</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Debian init.d boot script example for rsyslog</div>
  24       <div class="date"> 2nd November 2013</div>
  25       <div class="body"><p>If one of the points of switching to a new init system in Debian is
  26 <a href="http://thomas.goirand.fr/blog/?p=147">to get rid of huge
  27 init.d scripts</a>, I doubt we need to switch away from sysvinit and
  28 init.d scripts at all.  Here is an example init.d script, ie a rewrite
  29 of /etc/init.d/rsyslog:</p>
  30
  31 <p><pre>
  32 #!/lib/init/init-d-script
  33 ### BEGIN INIT INFO
  34 # Provides:          rsyslog
  35 # Required-Start:    $remote_fs $time
  36 # Required-Stop:     umountnfs $time
  37 # X-Stop-After:      sendsigs
  38 # Default-Start:     2 3 4 5
  39 # Default-Stop:      0 1 6
  40 # Short-Description: enhanced syslogd
  41 # Description:       Rsyslog is an enhanced multi-threaded syslogd.
  42 #                    It is quite compatible to stock sysklogd and can be
  43 #                    used as a drop-in replacement.
  44 ### END INIT INFO
  45 DESC="enhanced syslogd"
  46 DAEMON=/usr/sbin/rsyslogd
  47 </pre></p>
  48
  49 <p>Pretty minimalistic to me... For the record, the original sysv-rc
  50 script was 137 lines, and the above is just 15 lines, most of it meta
  51 info/comments.</p>
  52
  53 <p>How to do this, you ask?  Well, one create a new script
  54 /lib/init/init-d-script looking something like this:
  55
  56 <p><pre>
  57 #!/bin/sh
  58
  59 # Define LSB log_* functions.
  60 # Depend on lsb-base (>= 3.2-14) to ensure that this file is present
  61 # and status_of_proc is working.
  62 . /lib/lsb/init-functions
  63
  64 #
  65 # Function that starts the daemon/service
  66
  67 #
  68 do_start()
  69 {
  70         # Return
  71         #   0 if daemon has been started
  72         #   1 if daemon was already running
  73         #   2 if daemon could not be started
  74         start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
  75                 || return 1
  76         start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON -- \
  77                 $DAEMON_ARGS \
  78                 || return 2
  79         # Add code here, if necessary, that waits for the process to be ready
  80         # to handle requests from services started subsequently which depend
  81         # on this one.  As a last resort, sleep for some time.
  82 }
  83
  84 #
  85 # Function that stops the daemon/service
  86 #
  87 do_stop()
  88 {
  89         # Return
  90         #   0 if daemon has been stopped
  91         #   1 if daemon was already stopped
  92         #   2 if daemon could not be stopped
  93         #   other if a failure occurred
  94         start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
  95         RETVAL="$?"
  96         [ "$RETVAL" = 2 ] && return 2
  97         # Wait for children to finish too if this is a daemon that forks
  98         # and if the daemon is only ever run from this initscript.
  99         # If the above conditions are not satisfied then add some other code
 100         # that waits for the process to drop all resources that could be
 101         # needed by services started subsequently.  A last resort is to
 102         # sleep for some time.
 103         start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
 104         [ "$?" = 2 ] && return 2
 105         # Many daemons don't delete their pidfiles when they exit.
 106         rm -f $PIDFILE
 107         return "$RETVAL"
 108 }
 109
 110 #
 111 # Function that sends a SIGHUP to the daemon/service
 112 #
 113 do_reload() {
 114         #
 115         # If the daemon can reload its configuration without
 116         # restarting (for example, when it is sent a SIGHUP),
 117         # then implement that here.
 118         #
 119         start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE --name $NAME
 120         return 0
 121 }
 122
 123 SCRIPTNAME=$1
 124 scriptbasename="$(basename $1)"
 125 echo "SN: $scriptbasename"
 126 if [ "$scriptbasename" != "init-d-library" ] ; then
 127     script="$1"
 128     shift
 129     . $script
 130 else
 131     exit 0
 132 fi
 133
 134 NAME=$(basename $DAEMON)
 135 PIDFILE=/var/run/$NAME.pid
 136
 137 # Exit if the package is not installed
 138 #[ -x "$DAEMON" ] || exit 0
 139
 140 # Read configuration variable file if it is present
 141 [ -r /etc/default/$NAME ] && . /etc/default/$NAME
 142
 143 # Load the VERBOSE setting and other rcS variables
 144 . /lib/init/vars.sh
 145
 146 case "$1" in
 147   start)
 148         [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
 149         do_start
 150         case "$?" in
 151                 0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
 152                 2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
 153         esac
 154         ;;
 155   stop)
 156         [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
 157         do_stop
 158         case "$?" in
 159                 0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
 160                 2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
 161         esac
 162         ;;
 163   status)
 164         status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
 165         ;;
 166   #reload|force-reload)
 167         #
 168         # If do_reload() is not implemented then leave this commented out
 169         # and leave 'force-reload' as an alias for 'restart'.
 170         #
 171         #log_daemon_msg "Reloading $DESC" "$NAME"
 172         #do_reload
 173         #log_end_msg $?
 174         #;;
 175   restart|force-reload)
 176         #
 177         # If the "reload" option is implemented then remove the
 178         # 'force-reload' alias
 179         #
 180         log_daemon_msg "Restarting $DESC" "$NAME"
 181         do_stop
 182         case "$?" in
 183           0|1)
 184                 do_start
 185                 case "$?" in
 186                         0) log_end_msg 0 ;;
 187                         1) log_end_msg 1 ;; # Old process is still running
 188                         *) log_end_msg 1 ;; # Failed to start
 189                 esac
 190                 ;;
 191           *)
 192                 # Failed to stop
 193                 log_end_msg 1
 194                 ;;
 195         esac
 196         ;;
 197   *)
 198         echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
 199         exit 3
 200         ;;
 201 esac
 202
 203 :
 204 </pre></p>
 205
 206 <p>It is based on /etc/init.d/skeleton, and could be improved quite a
 207 lot.  I did not really polish the approach, so it might not always
 208 work out of the box, but you get the idea.  I did not try very hard to
 209 optimize it nor make it more robust either.</p>
 210
 211 <p>A better argument for switching init system in Debian than reducing
 212 the size of init scripts (which is a good thing to do anyway), is to
 213 get boot system that is able to handle the kernel events sensibly and
 214 robustly, and do not depend on the boot to run sequentially.  The boot
 215 and the kernel have not behaved sequentially in years.</p>
 216 </div>
 217
 218       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem</a>, <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.</div>
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 372 <li>2013
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 401 <li>2012
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 427
 428 </ul></li>
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 430 <li>2011
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 456
 457 </ul></li>
 458
 459 <li>2010
 460 <ul>
 461
 462 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 463
 464 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
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 467
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 475
 476 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 477
 478 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 479
 480 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 481
 482 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 483
 484 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 485
 486 </ul></li>
 487
 488 <li>2009
 489 <ul>
 490
 491 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 492
 493 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 494
 495 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 496
 497 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 498
 499 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 500
 501 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 502
 503 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 504
 505 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 506
 507 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 508
 509 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 510
 511 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 512
 513 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 514
 515 </ul></li>
 516
 517 <li>2008
 518 <ul>
 519
 520 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 521
 522 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 523
 524 </ul></li>
 525
 526 </ul>
 527
 528
 529
 530 <h2>Tags</h2>
 531 <ul>
 532
 533  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 534
 535  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 536
 537  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 538
 539  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 540
 541  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (10)</a></li>
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 561  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
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 563  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (391)</a></li>
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 566
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 572
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 582
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 584
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 589  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
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 591  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 592
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 596
 597  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (41)</a></li>
 598
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 622
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 626
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 628
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 631  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 632
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 637  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 638
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 641  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
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 648
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 652
 653  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
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 655  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (41)</a></li>
 656
 657 </ul>
 658
 659
 660     </div>
 661     <p style="text-align: right">
 662  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 663 </p>
 664
 665   </body>
 666 </html>