keepalived 配置文件中 shell 脚本中case选择语句写法

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cat /etc/init.d/keepalived
0 S" [; e" y$ x& ~- Y* E/ R#! /bin/sh
% @0 P8 P' h- e9 m#
4 M1 e. r. x. c. O# keepalived   LVS cluster monitor daemon.
#
( I5 x& }9 S  i+ h- G#              Written by Andres Salomon <dilinger@voxel.net>
#
### BEGIN INIT INFO
# Provides:          keepalived
# Required-Start:    $syslog $network $remote_fs
# Required-Stop:     $syslog $network $remote_fs
! S5 W# _) T. G) T# Default-Start:     2 3 4 5
6 Y' h/ P- ?; J# Default-Stop:      0 1 6
4 T$ e8 E4 q8 e4 U3 f# Short-Description: Starts keepalived
0 Z7 `7 x5 R+ ]& u# Description:       Starts keepalived lvs loadbalancer
( ?! g* \& z; {0 w9 u8 E2 r9 N### END INIT INFO
PATH=/sbin:/bin:/usr/sbin:/usr/bin
: a- y" g/ o2 v9 ]  E  K3 P+ k; lDAEMON=/usr/sbin/keepalived
  T/ q- }$ C" Y: BNAME=keepalived
DESC=keepalived
CONFIG=/etc/keepalived/keepalived.conf
TMPFILES="/tmp/.vrrp /tmp/.healthcheckers"
#includes lsb functions
- \; b3 w: C" v. /lib/lsb/init-functions
test -f $CONFIG || exit 0
test -f $DAEMON || exit 0

! A: a3 H: S% H" s: ]/ y$ G# Read configuration variable file if it is present
8 c4 ^' N) r5 G& c6 z: E4 E[ -r /etc/default/$NAME ] && . /etc/default/$NAME
3 z* Q" n! w( c, F% fcase "$1" in
  start)
( G$ h) i* }3 r3 t        log_daemon_msg "Starting $DESC" "$NAME"
7 t2 G: b* ^# }5 P5 H& H0 Q for file in $TMPFILES
9 {0 N3 m4 z  S- n  H: Z( }" \ do
: L7 R8 A& M7 D" N6 r. }* S, B/ [         test -e $file && test ! -L $file && rm $file
1 _( R# H& q: z6 d* U. v done
if start-stop-daemon --start --quiet --pidfile /var/run/$NAME.pid \
               --exec $DAEMON -- $DAEMON_ARGS; then
  log_end_msg 0
  J2 @7 {# X( k7 O else
  log_end_msg 1
( v: E& d- i- J5 l8 u' v) s fi
       ;;
* B: B4 a/ N4 K! E) e8 y: f: C  stop)
log_daemon_msg "Stopping $DESC" "$NAME"
) \9 u/ w2 G) i  E* B. } if start-stop-daemon --oknodo --stop --quiet --pidfile /var/run/$NAME.pid \
: e5 b6 t1 q' I  C' Q         --exec $DAEMON; then
  log_end_msg 0
else
  log_end_msg 1
fi
7 v/ c& Z3 D) X7 T8 Y5 R& N       ;;
; k& A* _8 y' Z# M3 H! I  reload|force-reload)
log_action_begin_msg "Reloading $DESC configuration..."
       if start-stop-daemon --stop --quiet --signal 1 --pidfile \
               /var/run/$NAME.pid --exec $DAEMON; then
        log_end_msg 0
5 Q: `* i% o+ e" Y1 C" g else
  log_action_end_msg 1
$ R9 {. U+ W6 G2 ~8 V4 w+ ?/ F fi
- e9 R9 [; ^" Z5 J, ^. l       ;;
* K: Q7 m1 }' q! G* J  restart)
6 \" u& T  W4 A+ u) `   log_action_begin_msg "Restarting $DESC" "$NAME"
4 `/ [. |& d; L! {        start-stop-daemon --stop --quiet --pidfile \
* _* a% ]8 Y/ J' G  /var/run/$NAME.pid --exec $DAEMON || true
       sleep 1
% {6 ^+ }9 H2 Q0 s$ e       if start-stop-daemon --start --quiet --pidfile \
$ `- P9 l& h8 \! g& o% a8 L8 z0 w* G               /var/run/$NAME.pid --exec $DAEMON -- $DAEMON_ARGS; then
1 H$ a/ Y6 b) g' A3 r        log_end_msg 0
) x; B9 _' U7 L. B: A% e3 ` else
0 [* {6 u) G. O/ I( Y2 K  log_end_msg 1
fi
$ a( k( B/ E% Y; E( e' o       ;;
  *)
       echo "Usage: /etc/init.d/$NAME {start|stop|restart|reload|force-reload}" >&2
       exit 1
/ o/ X" v. f4 u8 m+ x7 k       ;;
esac
! v9 H7 H# B6 Z% @9 r  @" {exit 0
, b, ]  k4 M) |, s+ L+ m