scripts/clvmd_init_red_hat.in

   1 #!/bin/bash
   2 #
   3 # clvmd - Clustered LVM Daemon init script
   4 #
   5 # chkconfig: - 24 76
   6 # description: Cluster daemon for userland logical volume management tools.
   7 #
   8 # For Red-Hat-based distributions such as Fedora, RHEL, CentOS.
   9 #
  10 ### BEGIN INIT INFO
  11 # Provides:             clvmd
  12 # Required-Start:       $local_fs@CLVMD_CMANAGERS@
  13 # Required-Stop:        $local_fs@CLVMD_CMANAGERS@
  14 # Short-Description:    This service is Clusterd LVM Daemon.
  15 # Description:          Cluster daemon for userland logical volume management tools.
  16 ### END INIT INFO
  17
  18 . /etc/rc.d/init.d/functions
  19
  20 DAEMON=clvmd
  21
  22 exec_prefix=@exec_prefix@
  23 sbindir=@sbindir@
  24
  25 lvm_vgchange=${sbindir}/vgchange
  26 lvm_vgdisplay=${sbindir}/vgdisplay
  27 lvm_vgscan=${sbindir}/vgscan
  28 lvm_lvdisplay=${sbindir}/lvdisplay
  29
  30 CLVMDOPTS="-T30"
  31
  32 [ -f /etc/sysconfig/cluster ] && . /etc/sysconfig/cluster
  33 [ -f /etc/sysconfig/$DAEMON ] && . /etc/sysconfig/$DAEMON
  34
  35 [ -n "$CLVMD_CLUSTER_IFACE" ] && CLVMDOPTS="$CLVMDOPTS -I $CLVMD_CLUSTER_IFACE"
  36
  37 # allow up to $CLVMD_STOP_TIMEOUT seconds to clvmd to complete exit operations
  38 # default to 10 seconds
  39
  40 [ -z $CLMVD_STOP_TIMEOUT ] && CLVMD_STOP_TIMEOUT=10
  41
  42 LOCK_FILE="/var/lock/subsys/$DAEMON"
  43
  44 # NOTE: replace this with vgs, once display filter per attr is implemented.
  45 clustered_vgs() {
  46         ${lvm_vgdisplay} 2>/dev/null | \
  47                 awk 'BEGIN {RS="VG Name"} {if (/Clustered/) print $1;}'
  48 }
  49
  50 clustered_active_lvs() {
  51         for i in $(clustered_vgs); do
  52                 ${lvm_lvdisplay} $i 2>/dev/null | \
  53                 awk 'BEGIN {RS="LV Name"} {if (/[^N^O^T] available/) print $1;}'
  54         done
  55 }
  56
  57 rh_status() {
  58         status $DAEMON
  59 }
  60
  61 rh_status_q() {
  62         rh_status >/dev/null 2>&1
  63 }
  64
  65 start()
  66 {
  67         if ! rh_status_q; then
  68                 echo -n "Starting $DAEMON: "
  69                 $DAEMON $CLVMDOPTS || return $?
  70                 echo
  71         fi
  72
  73         # Refresh local cache.
  74         #
  75         # It's possible that new PVs were added to this, or other VGs
  76         # while this node was down. So we run vgscan here to avoid
  77         # any potential "Missing UUID" messages with subsequent
  78         # LVM commands.
  79
  80         # The following step would be better and more informative to the user:
  81         # 'action "Refreshing VG(s) local cache:" ${lvm_vgscan}'
  82         # but it could show warnings such as:
  83         # 'clvmd not running on node x-y-z  Unable to obtain global lock.'
  84         # and the action would be shown as FAILED when in reality it didn't.
  85         # Ideally vgscan should have a startup mode that would not print
  86         # unnecessary warnings.
  87
  88         ${lvm_vgscan} > /dev/null 2>&1
  89
  90         action "Activating VG(s):" ${lvm_vgchange} -ayl $LVM_VGS || return $?
  91
  92         touch $LOCK_FILE
  93
  94         return 0
  95 }
  96
  97 wait_for_finish()
  98 {
  99         count=0
 100         while [ "$count" -le "$CLVMD_STOP_TIMEOUT" ] && \
 101                  rh_status_q ]; do
 102                 sleep 1
 103                 count=$((count+1))
 104         done
 105
 106         ! rh_status_q
 107 }
 108
 109 stop()
 110 {
 111         rh_status_q || return 0
 112
 113         [ -z "$LVM_VGS" ] && LVM_VGS="$(clustered_vgs)"
 114         if [ -n "$LVM_VGS" ]; then
 115                 action "Deactivating clustered VG(s):" ${lvm_vgchange} -anl $LVM_VGS || return $?
 116         fi
 117
 118         action "Signaling $DAEMON to exit" kill -TERM $(pidofproc $DAEMON) || return $?
 119
 120         # wait half second before we start the waiting loop or we will show
 121         # the loop more time than really necessary
 122         usleep 500000
 123
 124         # clvmd could take some time to stop
 125         rh_status_q && action "Waiting for $DAEMON to exit:" wait_for_finish
 126
 127         if rh_status_q; then
 128                 echo -n "$DAEMON failed to exit"
 129                 failure
 130                 echo
 131                 return 1
 132         else
 133                 echo -n "$DAEMON terminated"
 134                 success
 135                 echo
 136         fi
 137
 138         rm -f $LOCK_FILE
 139
 140         return 0
 141 }
 142
 143 reload() {
 144         rh_status_q || exit 7
 145         action "Reloading $DAEMON configuration: " $DAEMON -R || return $?
 146 }
 147
 148 restart() {
 149         # if stop fails, restart will return the error and not attempt
 150         # another start. Even if start is protected by rh_status_q,
 151         # that would avoid spawning another daemon, it would try to
 152         # reactivate the VGs.
 153
 154         # Try to get clvmd to restart itself. This will preserve
 155         # exclusive LV locks
 156         action "Restarting $DAEMON: " $DAEMON -S
 157
 158         # If that fails then do a normal stop & restart
 159         if  [ $? != 0 ]; then
 160             stop && start
 161             return $?
 162         else
 163             touch $LOCK_FILE
 164             return 0
 165         fi
 166 }
 167
 168 [ "$EUID" != "0" ] && {
 169         echo "clvmd init script can only be executed as root user"
 170         exit 4
 171 }
 172
 173 # See how we were called.
 174 case "$1" in
 175   start)
 176         start
 177         rtrn=$?
 178         ;;
 179
 180   stop)
 181         stop
 182         rtrn=$?
 183         ;;
 184
 185   restart|force-reload)
 186         restart
 187         rtrn=$?
 188         ;;
 189
 190   condrestart|try-restart)
 191         rh_status_q || exit 0
 192         restart
 193         rtrn=$?
 194         ;;
 195
 196   reload)
 197         reload
 198         rtrn=$?
 199         ;;
 200
 201   status)
 202         rh_status
 203         rtrn=$?
 204         if [ $rtrn = 0 ]; then
 205                 cvgs="$(clustered_vgs)"
 206                 echo Clustered Volume Groups: ${cvgs:-"(none)"}
 207                 clvs="$(clustered_active_lvs)"
 208                 echo Active clustered Logical Volumes: ${clvs:-"(none)"}
 209         fi
 210         ;;
 211
 212   *)
 213         echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
 214         rtrn=2
 215         ;;
 216 esac
 217
 218 exit $rtrn