drbd.in

linux集群服务器软件代码包

#!/bin/sh
#
#	$Id: drbd.in,v 1.3 2004/09/06 10:33:02 lars Exp $
#
#       OCF Resource Agent compliant drbd resource script.
#
# WARNING: This is proof of concept code and likely doesn't work at all!
#
# Copyright (c) 2004 SUSE LINUX AG, Lars Marowsky-Br閑
#                    All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#
#

# TODO: 
# - All calls to external commands should use the ocf_exec function
#   which should be implemented.

#######################################################################
# Initialization:

. @hb_libdir@/ocf-shellfuncs

DRBDADM="@DRBDADM@"
DRBDSETUP="@DRBDSETUP@"

#######################################################################

meta_data() {
	cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="IPaddr2" version="0.9">
<version>1.0</version>
<parameters>
<parameter name="drbd" unique="1">
<longdesc lang="en">
The name of the drbd resource from the drbd.conf file.
</longdesc>
<shortdesc lang="en">drbd name</shortdesc>
<content type="string" default="drbd0" />
</parameter>

<parameter name="drbdconf">
<longdesc lang="en">
Full path to the drbd.conf file.
</longdesc>
<shortdesc lang="en">Path to drbd.conf</shortdesc>
<content type="string" default="/etc/drbd.conf"/>
</parameter>

<parameter name="incarnations_max_global">
<longdesc lang="en">
Number of total incarnations of this drbd.
</longdesc>
<shortdesc lang="en">Number of nodes</shortdesc>
<content type="integer" default="2"/>
</parameter>

<parameter name="incarnations_max_node">
<longdesc lang="en">
How many incarnations on one node. Don't mess.
</longdesc>
<shortdesc lang="en">Set to one</shortdesc>
<content type="integer" default="1"/>
</parameter>

<parameter name="incarnations_max_active_global">
<longdesc lang="en">
How many incarnations can be primary. Don't mess.
</longdesc>
<shortdesc lang="en">Set to one</shortdesc>
<content type="integer" default="1"/>
</parameter>

</parameters>

<actions>
<action name="start"   timeout="90" />
<action name="promote"   timeout="90" />
<action name="demote"   timeout="90" />
<action name="notify"   timeout="90" />
<action name="stop"    timeout="100" />
<action name="xstatus"    timeout="100" />
<action name="monitor" depth="0"  timeout="20" interval="10" start-delay="1m" />
<action name="meta-data"  timeout="5" />
<action name="verify-all"  timeout="30" />
</actions>
</resource-agent>
END

	exit $OCF_SUCCESS
}

drbd_init() {
	if [ $UID -ne 0 ]; then
		ha_log "ERROR: You must be root."
		exit $OCF_ERR_PERM
	fi
	
	if [ ! -x "$DRBDADM" ]; then
		ha_log "ERROR: drbdadm not installed."
		exit $OCF_ERR_INSTALLED
	fi
	
	DRBD="$OCF_RESKEY_drbd"
	INC_NO="$OCF_RESKEY_incarnation_no"
	DRBDCONF="$OCF_RESKEY_drbdconf"
	
	if [ ! -f "$DRBDCONF" ]; then
		ha_log "ERROR: drbd.conf not installed."
		exit $OCF_ERR_CONFIGURED
	fi

	DRBD_STATE=$($DRBDADM state $DRBD)
	DRBD_STATE_LOCAL=$(echo $DRBD_STATE | sed -e 's#/.*##')
	DRBD_STATE_REMOTE=$(echo $DRBD_STATE | sed -e 's#.*/##')
	DRBD_CSTATE=$($DRBDADM state $DRBD)

	# TODO: Inherit max primary etc from configuration and do
	# something about them. Right now, we just assume 1/1.
}


#######################################################################

drbd_usage() {
	cat <<END
usage: $0 {meta-data}

Expects to have a fully populated OCF RA-compliant environment set.
END
}

drbd_start() {
	# TODO: Verify idempotency of drbdadm up
	$DRBDADM -c $DRBDCONF up $DRBD
	if [ $? -eq 0 ]; then
		return $OCF_SUCCESS
	else
		return $OCF_ERR_GENERIC
	fi
}

drbd_stop() {
	# TODO: this is a _force_ operation. we may need to kill higher
	# levels to be able to down drbd. figure out how...
	$DRBDADM -c $DRBDCONF down $DRBD
	if [ $? -eq 0 ]; then
		return $OCF_SUCCESS
	else
		return $OCF_ERR_GENERIC
	fi
}

drbd_monitor() {
	# TODO: Think about how to monitor drbd and what constitutes
	# failure cases...
	# diskless etc?
	# A secondary node which is supposed to be primary?
	return $OCF_SUCCESS
}

drbd_promote() {
	if [ "x$DRBD_STATE_LOCAL" = "xPrimary" ]; then
		return $OCF_SUCCESS
	fi
	$DRBDADM -c $DRBDCONF primary $DRBD
	if [ $? -eq 0 ]; then
		return $OCF_SUCCESS
	else
		return $OCF_ERR_GENERIC
	fi
	return $OCF_SUCCESS
}

drbd_demote() {
	# TODO: this is a _force_ operation. we may need to kill higher
	# levels (or switch them to r/o) to be able to demote drbd.
	# figure out how...
	
	if [ "x$DRBD_STATE_LOCAL" = "xSecondary" ]; then
		return $OCF_SUCCESS
	fi
	$DRBDADM -c $DRBDCONF secondary $DRBD
	if [ $? -eq 0 ]; then
		return $OCF_SUCCESS
	else
		return $OCF_ERR_GENERIC
	fi
}

drbd_notify() {
	local target_action="$OCF_RESKEY_target_action"
	local notify_type="$OCF_RESKEY_notify_type"
	local target_status="${OCF_RESKEY_target_status:-1}"

	if [ "x$notify_type" = "xpost" ]; then
		case $target_action in
		stop|fence)
			# On the primary, this would unblock waiting for
			# ACKs from the secondary.
			# On the secondary, this would un-taint the
			# local data and allow the node to be promoted
			# to primary.
			#
			if [ "$target_status" -eq 0 ]; then
				# TODO: This comamnd is also not
				# implemented in drbdadm yet ;-)
				$DRBDADM mark_peer_down $DRBD
			fi
			;;
		monitor)
			if [ "$target_status" -ne 0 ]; then
				# TODO: Anything we should do about this?
			fi
		esac
	fi
	
	return $OCF_SUCCESS
}

drbd_xstatus() {
	# TODO: This extended status is PROOF OF CONCEPT CODE FOR
	# DISCUSSION only.

	local preference=0
	local ability=1

	case $DRBD_CSTATE in
	SyncSource|PausedSyncS|WFBitMapS|SkippedSyncS)
		preference=10
		;;
	Diskless|Inconsistent)
		# TODO: drbd doesn't actually tell us about these two.
		ability=0
		;;
	*)	preference=5
		;;
	esac
	
	case $DRBD_STATE_LOCAL in
	Primary)
		preference=100
		;;
	esac

	cat <<END
<resource_status name="$OCF_INSTANCE" incarnation="$INC_NO">
<promotion_data preference="$drbd_preference" ability="$ability" />
</resource_status>
END

	return $OCF_SUCCESS
}

case $ACTION in
meta-data)	meta_data
		;;
start|stop|monitor|xstatus|validate-all|promote|demote|notify)
		drbd_init
		drbd_$ACTION
		exit $?
		;;
usage|help)	drbd_usage
		exit $OCF_SUCCESS
		;;
*)		drbd_usage
		exit $OCF_ERR_UNIMPLEMENTED
		;;
esac