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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 390 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
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 414 </ul></li>
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 416 <li>2012
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 442
 443 </ul></li>
 444
 445 <li>2011
 446 <ul>
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 448 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
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 469
 470 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 471
 472 </ul></li>
 473
 474 <li>2010
 475 <ul>
 476
 477 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 478
 479 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 480
 481 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 482
 483 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 484
 485 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 486
 487 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 488
 489 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 490
 491 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 492
 493 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 494
 495 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 496
 497 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 498
 499 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 500
 501 </ul></li>
 502
 503 <li>2009
 504 <ul>
 505
 506 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 507
 508 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 509
 510 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 511
 512 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 513
 514 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 515
 516 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 517
 518 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 519
 520 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 521
 522 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 523
 524 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 525
 526 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 527
 528 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 529
 530 </ul></li>
 531
 532 <li>2008
 533 <ul>
 534
 535 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 536
 537 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 538
 539 </ul></li>
 540
 541 </ul>
 542
 543
 544
 545 <h2>Tags</h2>
 546 <ul>
 547
 548  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 549
 550  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 551
 552  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 553
 554  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 555
 556  <li><a href="http://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (8)</a></li>
 557
 558  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (11)</a></li>
 559
 560  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 561
 562  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 563
 564  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 565
 566  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (167)</a></li>
 567
 568  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 569
 570  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
 571
 572  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 573
 574  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 575
 576  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (25)</a></li>
 577
 578  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 579
 580  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (402)</a></li>
 581
 582  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 583
 584  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 585
 586  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (33)</a></li>
 587
 588  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 589
 590  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 591
 592  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 593
 594  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 595
 596  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 597
 598  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (21)</a></li>
 599
 600  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 601
 602  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 603
 604  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 605
 606  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 607
 608  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 609
 610  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 611
 612  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 613
 614  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 615
 616  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (12)</a></li>
 617
 618  <li><a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5 (14)</a></li>
 619
 620  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (305)</a></li>
 621
 622  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (195)</a></li>
 623
 624  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (37)</a></li>
 625
 626  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 627
 628  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (73)</a></li>
 629
 630  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (108)</a></li>
 631
 632  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 633
 634  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 635
 636  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 637
 638  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 639
 640  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (11)</a></li>
 641
 642  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 643
 644  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 645
 646  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 647
 648  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (55)</a></li>
 649
 650  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 651
 652  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 653
 654  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (63)</a></li>
 655
 656  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 657
 658  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 659
 660  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
 661
 662  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 663
 664  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 665
 666  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 667
 668  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (15)</a></li>
 669
 670  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (73)</a></li>
 671
 672  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 673
 674  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 675
 676 </ul>
 677
 678
 679     </div>
 680     <p style="text-align: right">
 681  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 682 </p>
 683
 684   </body>
 685 </html>