[Linux-HA] Help : DRBD, Heartbeat (Active-Active Node configuration)

[Eddie C]

I did this using heartbeat V2. I am attaching a screen shot.

1. drbd (lsb) clone (clone max 2) (clone node max 1)
2. drbd_state (lsb) clone  (clone max 2) (clone node max 1)
3. ocfs2 (lsb) clone (clone max 2) (clone node max 1)

I made this 'fake service' called drbd_state to turn a node from
UpToDate -- Secondary to UpToDate -- Primary . I have the feeling
there must be some config file setting to do this. If the drdb start
script would block until the system is UpToDate--Primary my middle
script would not be needed.

Used ordering to make sure they start in the correct order.

drbd_state
#!/bin/bash
# ToDo: should be able to work with only certain drbd instances. Now
is all or nothing
# chkconfig: 345 24 8
# description: Makes secondary drbd node primary if the data is uptodate
#
# Edward Capriolo
#
### BEGIN INIT INFO
# Provides: drbd_state
# Default-Start:  3 5
# Default-Stop:   0 1 2 6
# Short-Description:    Makes secondary drbd node primary if the data
is uptodate
### END INIT INFO

DEFAULTFILE="/etc/default/drbd"
DRBDADM="/sbin/drbdadm"
PROC_DRBD="/proc/drbd"
MODPROBE="/sbin/modprobe"
RMMOD="/sbin/rmmod"
UDEV_TIMEOUT=10
ADD_MOD_PARAM=""

if [ -f $DEFAULTFILE ]; then
  . $DEFAULTFILE
fi

test -f $DRBDADM || exit 5


case "$1" in
    start)
        echo  "Starting DRBD state:    "


        for RESOURCE in `$DRBDADM sh-resources`; do
                #  $DRBDADM dstate
                my_dstate=`$DRBDADM dstate $RESOURCE  | cut -d'/' -f1`
                my_cstate=`$DRBDADM cstate $RESOURCE  | cut -d'/' -f1`
                my_state=`$DRBDADM state  $RESOURCE  | cut -d'/' -f1`
                if [ "$my_dstate" = "UpToDate" ] ; then
                        echo "State is UpToDate"
                        if [ "$my_state" = "Secondary" ] ; then
                                echo "$RESOURCE will be promoted to primary"
                                $DRBDADM primary $RESOURCE
                        fi
                else
                        echo "State is $my_dstate. Manual intervention required"
                        exit 1
                fi
        done

        [ -d /var/lock/subsys ] && touch /var/lock/subsys/drbd_state
# for RedHat
        ;;
    stop)
        echo -n "Stopping all DRBD state resources"
        [ -f /var/lock/subsys/drbd ] && rm /var/lock/subsys/drbd_state
        ;;
    status)
        # NEEDS to be heartbeat friendly...
        # so: put some "OK" in the output.
        for RESOURCE in `$DRBDADM sh-resources`; do
                #  $DRBDADM dstate
                my_dstate=`$DRBDADM dstate $RESOURCE  | cut -d'/' -f1`
                my_cstate=`$DRBDADM cstate $RESOURCE  | cut -d'/' -f1`
                my_state=`$DRBDADM state  $RESOURCE  | cut -d'/' -f1`
                if [ "$my_dstate" = "UpToDate" ] ; then
                        echo "State is UpToDate"
                        if [ "$my_state" = "Primary" ] ; then
                                echo "$RESOURCE is primary"
                                exit 0
                        else
                                echo >&2 "$RESOURCE is $my_state"
                                exit 3
                        fi
                else
                        echo >&2 "State is $my_dstate. Manual
intervention required"
                        exit 3
                fi
        done

        ;;
    reload)
        echo "."
        ;;
    restart|force-reload)
        echo -n "Restarting is a no-op for this script"
        echo "."
        ;;
    *)
        echo "Usage: /etc/init.d/drbd_state
{start|stop|status|reload|restart|force-reload}"
        exit 1
        ;;
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